CN106749094A - 42 (2` hydroxy phenyls) benzoxazole compounds and its preparation method and purposes containing substituted base - Google Patents

42 (2` hydroxy phenyls) benzoxazole compounds and its preparation method and purposes containing substituted base Download PDF

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CN106749094A
CN106749094A CN201611128271.0A CN201611128271A CN106749094A CN 106749094 A CN106749094 A CN 106749094A CN 201611128271 A CN201611128271 A CN 201611128271A CN 106749094 A CN106749094 A CN 106749094A
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compound
hydroxy phenyls
bromophenols
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钱妍
方启运
檀康明
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Nanjing Post and Telecommunication University
Nanjing University of Posts and Telecommunications
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    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D277/00Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings
    • C07D277/60Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings condensed with carbocyclic rings or ring systems
    • C07D277/62Benzothiazoles
    • C07D277/64Benzothiazoles with only hydrocarbon or substituted hydrocarbon radicals attached in position 2
    • C07D277/66Benzothiazoles with only hydrocarbon or substituted hydrocarbon radicals attached in position 2 with aromatic rings or ring systems directly attached in position 2
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    • C09K11/00Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/06Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
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    • H10K85/00Organic materials used in the body or electrodes of devices covered by this subclass
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    • H10K85/649Aromatic compounds comprising a hetero atom
    • H10K85/657Polycyclic condensed heteroaromatic hydrocarbons
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    • C09K2211/1037Heterocyclic compounds characterised by ligands containing one nitrogen atom as the heteroatom with sulfur

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Abstract

The present invention is related to and belongs to photoconductive organic semiconductor technical field, there is provided a kind of 42 (2' hydroxy phenyls) benzoxazole compounds and its preparation and use containing substituted base.Described 4 formulas of 2 (2' hydroxy phenyls) benzoxazole compounds containing substituted base are:Wherein X is S, O or NH, and Ar is the unit of conjugated structure containing aromatic hydrocarbons.The compound is prepared by suzuki reaction with the polycyclic aromatic hydrocarbon compounds with bromine by 2 (2'4 bromophenols) benzothiazoles.The compound invented herein has the four-level transition photoluminescent property of excited state intramolecular proton transfer compound, can be as luminescent material, in white organic diode component.Compound of the invention has:The advantages of big stoke shift, good luminous quantum efficiency, preparation is simply, synthetic yield is high.

Description

4 containing substituted base 2- (2 '-hydroxy phenyl) benzoxazole compounds and its preparation method and Purposes
Technical field
The invention belongs to photoconductive organic semiconductor technical field, and in particular to a kind of 4 2- (the 2'- hydroxyls containing substituted base Base phenyl) benzoxazole compound and its preparation and application.
Background technology
1987, the C.W.Tang in the U.S. et al. inventions were made the organic light-emitting diodes of multilayer architecture with vacuum vapour deposition Pipe (OLED) so that the research of organic electroluminescence device is paid much attention to by scientists from all over the world.The development of OLED technology is right Photoelectric display field generates earth-shaking change.Nowadays the maturation of the development of material science and theoretical technique is to new OLED Development play vital effect so that exploration of the researcher of Material Field to luminescent material generates greatly emerging Interest.Have that efficiency high, brightness are high, low in energy consumption, visual angle is wide due to white organic LED (WOLED), fast response time, master Dynamic luminous, ultra-thin and ultra-light and can the excellent properties such as flexibility, and have broad prospect of application in display and lighting field, learned The extensive attention of person and industry and turn into study hotspot.
1994, professor Kido of Japanese chevron university waited and is prepared for first WOLED device in the world first, although working as When device maximum power efficiency there was only 0.83lm/W, high-high brightness only has 3400cd/M2But, still in organic electroluminescent Devices field realizes breakthrough progress.
2003, WOLED device efficiencies reached 15lm/W and have exceeded incandescent lamp first.2006, the U.S. Holy Land was sub- The Nobuhiro Ide research groups of brother university prepare the stack multilayer light-emitting junction of Color tunable control using full phosphor material The WOLED of structure, its device efficiency has reached 62.8lm/W.2008, the James Esler researchs of San Diego, USA university were small Group prepares the WOLED that maximum power efficiency is 100 lm/W multi-luminescent layer structures, and its operating voltage is 3.6V, external quantum efficiency Reach 20%.
The efficiency of multi-luminescent layer WOLED is generally higher, but structure and process conditions are relative complex, voltage is higher, cause Cost is also of a relatively high, there is hetero-junctions between each luminescent layer, and stable color coordinate is typically poor.How reasonably to control Exciton generating region, exciton recombination region, energy transfer and exciton diffusion are to obtain high performance guarantee between each luminescent layer.
At present, in WOLED fields, a kind of device efficiency of exploitation is high, process is simple, and low cost, the individual layer of good stability is white Optical device is to realize the commercialized key of white organic LED.
The content of the invention
For device preparation technology present in current white organic LED it is complicated, cost of manufacture is higher, repeat Property the technical problem such as poor, the invention provides 2- (the 2'- hydroxyl containing substituted base of a kind of new organic fluorescence materials, i.e., 4 Phenyl) benzoxazole compound, and its preparation method and application.Described organic fluorescence materials are a series of with excited state molecule endoplasm 2- (2'- hydroxy phenyls) benzothiazole of the four-level transition property of sub- transfer compounds, and connect various conjugated structures containing aromatic hydrocarbons The new material of unit.This kind of material has fluorescence quantum yield high, and stoke shift is big, and synthesis is simple, the advantages of yield is high.It is logical Cross and mix commercialized blue light material composition binary complementary colours, can be with the single layer white light device of preparation process is simple.The present invention is adopted Technical scheme is as follows.
The invention provides a kind of 4 2- (2'- hydroxy phenyls) benzoxazole compounds containing substituted base.
4 of the present invention 2- (2'- hydroxy phenyls) benzoxazole compounds containing substituted base, its general structure is:
In formula:X is S, O or NH, and Ar is the unit of conjugated structure containing aromatic hydrocarbons.
The unit of conjugated structure containing aromatic hydrocarbons is selected from the one kind in following substituent structure:
The present invention also provides above-mentioned 4 preparation methods of 2- (2'- hydroxy phenyls) benzoxazole compound containing substituted base.
The 4 of the present invention preparation methods of 2- (2'- hydroxy phenyls) benzoxazole compound containing substituted base, its bag Include following steps:
(1) boration of the compound of conjugated structure containing aromatic hydrocarbons:Under nitrogen protection, aryl bromide is dissolved in dry organic molten Agent, temperature adds n-BuLi under the conditions of being less than -40 DEG C, after stirring 2 to 4 hours, add boronic acid compounds, boration to heat up Reacted 15-20 hours after to normal temperature.After reaction terminates, organic phase is extracted, organic phase is merged into drying, obtain product.
(2) by product and 2- (2'-4- bromophenols) benzothiazole of step (1), palladium catalyst is dissolved in organic solvent, Ran Houjia Enter strong alkali aqueous solution, the lower reaction of nitrogen protection.After reaction terminates, organic phase is extracted, merge organic phase and concentrate, separating-purifying Afterwards, end-product is obtained, product as of the invention.
In above-mentioned steps (1), low-temp reaction can be used dry ice acetone bath cooling;The boronic acid compounds are positive three fourth of boric acid Ester;Organic phase is extracted using water and dichloromethane;The organic solvent is tetrahydrofuran.
In above-mentioned steps (2), the palladium catalyst is tetrakis triphenylphosphine palladium, double (dibenzalacetone) palladiums, 1,1- are double (diphenyl phosphine) ferrocene dichloro, highly basic is one or more in potassium carbonate, potassium chloride, potassium fluoride, and the organic solvent is The volume ratio of tetrahydrofuran and toluene is 1:1 mixed solvent.Reaction temperature is 80-120 DEG C, and the reaction time is 24-60 hours. The formula of described 2- (2'-4- bromophenols) benzoxazole compound is:
Wherein, X is S, O or NH.
In above-mentioned preparation method, according to the molar ratio, in step (1), the ratio of aryl bromide and n-BuLi is 1:0.9~ 1.5, preferably 1:1.2;In step (2), the ratio of the boration aryl bromide and 2- (2'-4- bromophenols) benzothiazole is 1: 0.5~1.5, preferably 1:1
The adding proportion of the aryl bromide and organic solvent is 1 mole:2~8 liters.It is preferably in a proportion of 1 mole:4~6 Rise.
It is still another object of the present invention to provide based on 4 2- (2'- hydroxy phenyls) benzothiazole chemical combination containing substituted base Thing is used to prepare the purposes of white organic LED.
4 of the present invention 2- (2'- hydroxy phenyls) benzoxazole compounds containing substituted base can be as luminous material Material, in white organic diode component.Binary complementary colours is constituted by mixing commercialized blue light material, work can be prepared The simple single layer white light device of skill.
The present invention has the advantages that:1st, 4 of the invention 2- (2'- hydroxy phenyls) benzothiazoles containing substituted base Compound has fluorescence quantum yield high, and stoke shift is big;2nd, the preparation method synthesis of above-claimed cpd is simple, and yield is high, Beneficial to expanding the scale of production;3rd, above-claimed cpd can be as luminescent material, in white organic diode component.
Brief description of the drawings
The carbon spectrogram of the compound of Fig. 1 embodiment of the present invention 2;
The carbon spectrogram of the compound of Fig. 2 embodiment of the present invention 3;
The fluorescent absorption of the compound of Fig. 3 embodiment of the present invention 2-transmitting figure;
The fluorescent absorption of the compound of Fig. 4 embodiment of the present invention 3-transmitting figure;
The redox curve of the compound of Fig. 5 embodiment of the present invention 2.
Specific embodiment
In order to be best understood from the content of patent of the present invention, skill of the invention is further illustrated below by specific example Art scheme.But these embodiments are not intended to limit the present invention.
Material 2- (2'-4- bromophenols) benzothiazoles by suzuki reaction connect various aromatic hydrocarbons conjugated structure units to electricity Subbase group, the material has following formula:
In formula:X is S, O or NH.
Embodiment 1,
First, the preparation of 2- (2'-4- bromophenols) benzothiazole:
Take diaminophenol (4.4g, 20mmol, 1equiv) and p-aminobenzoic acid (2.5g, 20mmol, 1equiv) is added In 130ml polyphosphoric acids, in N2Environment in be heated to 168 DEG C, and flow back 6 hours.After question response is complete, by product after cooling It is dissolved in 100ml mixture of ice and water, the NaOH aqueous solution for being added thereto to saturation is neutralized.Treat pH value be adjusted to 6 or so change plus NaHCO3, it is stirring while adding, to there is no CO2Bubble is produced.By the solution left standstill after neutralization after suction filtration after solution clarification.Taking out Leach the solid for coming and add saturation NaHCO3The aqueous solution is extracted with ethyl acetate three times, merges organic layer, uses anhydrous Na2SO4Dry Green product 5g is obtained after revolving, yield is 83%.(in following embodiments, the preparation side of 2- (2'-4- bromophenols) benzothiazole Method is all identical with this, repeats no more).
Secondly, the preparation of 2- (2'- benzothiazoles) -4- (9'- is luxuriant and rich with fragrance) phenol
(1) boration of the compound of conjugated structure containing aromatic hydrocarbons:Under nitrogen protection, 9- bromo phenanthrenes are dissolved in dry tetrahydrochysene furan Mutter, be placed in cooling in dry ice acetone bath (- 78 DEG C), n-BuLi, the addition ratio of 9- bromo phenanthrenes and n-BuLi are added under low temperature Example is 1:After 0.9 stirring 2 hours, add the positive tri butyl ester of boric acid, boration to continue to react 0.5 hour, remove dry ice acetone bath, Reacted 15 hours after being warmed up to normal temperature.After reaction terminates, reaction is quenched under ice-water bath, then being extracted with water and dichloromethane has Machine phase, merges organic phase drying and is spin-dried for, obtains product.
(2) take 9- boric acid phenanthrene (0.18g, 0.75mmol, 1 equivalent) and 2- (2'-4- bromophenols) benzothiazole (0.12g, 0.38mmol, 0.5 equivalent) the mixing volume ratio that is dissolved in 20ml tetrahydrofurans and toluene is 1:In 1 mixed solution.Add catalysis Agent Pd (pph3)4.Lucifuge leads to nitrogen, and it is the potassium carbonate of 2mol/L and the aqueous solution of potassium fluoride to add 10ml concentration.At 80 DEG C Under the conditions of react 24 hours.After reaction terminates, organic phase is extracted, merge organic phase and concentrate, carried out by the method for chromatographic column Separating-purifying, obtains yellow powder end-product.
Embodiment 2,
The preparation of 2- (2'- benzothiazoles) -4- (9'- is luxuriant and rich with fragrance) phenol
(1) boration of the compound of conjugated structure containing aromatic hydrocarbons:Under nitrogen protection, 9- bromo phenanthrenes are dissolved in dry tetrahydrochysene furan Mutter, be placed in be cooled in dry ice acetone bath under -78 DEG C, low temperature and add n-BuLi, the addition ratio of 9- bromo phenanthrenes and n-BuLi Example is 1:1.2, after stirring 3 hours, add the positive tri butyl ester of boric acid, boration to continue to react 0.5 hour, dry ice acetone bath is removed, Reacted 18 hours after being warmed up to normal temperature.After reaction terminates, reaction is quenched under ice-water bath, then being extracted with water and dichloromethane has Machine phase, merges organic phase drying and is spin-dried for, obtains product.
(2) take 9- boric acid phenanthrene (0.18g, 0.75mmol, 1 equivalent) and 2- (2'-4- bromophenols) benzothiazole (0.24g, 0.75mmol, 1 equivalent) the mixing volume ratio that is dissolved in 20ml tetrahydrofurans and toluene is 1:In 1 mixed solution.Add catalyst Pd(pph3)4.Lucifuge leads to nitrogen, and it is the potassium carbonate of 2mol/L and the aqueous solution of potassium fluoride to add 10ml concentration.In 90 DEG C of bar Reacted 48 hours under part.After reaction terminates, organic phase is extracted, merge organic phase and concentrate, divided by the method for chromatographic column From purification, yellow powder end-product 0.31g is obtained, yield is 82%.
Nuclear magnetic resonance and redox curve detection are carried out to end-product, respectively as shown in Figure 1 and Figure 5
Embodiment 3,
The preparation of 2- (2'- benzothiazoles) -4- (1'- pyrenes) phenol
Change the 9- boric acid phenanthrene in embodiment 2 into 1- boric acid pyrenes, concretely comprise the following steps:
(1) boration of the compound of conjugated structure containing aromatic hydrocarbons:Under nitrogen protection, 1- bromos pyrene is dissolved in dry tetrahydrochysene furan Mutter, be placed in be cooled in dry ice acetone bath under -78 DEG C, low temperature and add n-BuLi, the addition ratio of 1- bromos pyrene and n-BuLi Example is 1:1.2, after stirring 3 hours, add the positive tri butyl ester of boric acid, boration to continue to react 0.5 hour, dry ice acetone bath is removed, Reacted 18 hours after being warmed up to normal temperature.After reaction terminates, reaction is quenched under ice-water bath, then being extracted with water and dichloromethane has Machine phase, merges organic phase drying and is spin-dried for, obtains product.
(2) take 9- boric acid pyrene (0.6g, 2.2mol, 1 equivalent) and 2- (2'-4- bromophenols) benzothiazole (0.7g, 2.2mmol, 1 equivalent) the mixing volume ratio that is dissolved in 30ml tetrahydrofurans and toluene is 1:In 1 mixed solution.Add catalyst Pd(pph3)4.Lucifuge leads to nitrogen, and it is the potassium carbonate of 2mol/L and the aqueous solution of potassium fluoride to add 10ml concentration.In 90 DEG C of bar Reacted 48 hours under part.After reaction terminates, organic phase is extracted, merge organic phase and concentrate, divided by the method for chromatographic column From purification, yellow powder end-product 0.86g is obtained, yield is 73%.
Magnetic resonance detection is carried out to end-product, as shown in Figure 2.
Embodiment 4,
The preparation of 2- (2'- benzothiazoles) -4- (1'- pyrenes) phenol
(1) boration of the compound of conjugated structure containing aromatic hydrocarbons:Under nitrogen protection, 1- bromos pyrene is dissolved in dry tetrahydrochysene furan Mutter, be placed in be cooled in dry ice acetone bath under -78 DEG C, low temperature and add n-BuLi, the addition ratio of 1- bromos pyrene and n-BuLi Example is 1:1.5, after stirring 4 hours, add the positive tri butyl ester of boric acid, boration to continue to react 0.5 hour, dry ice acetone bath is removed, Reacted 20 hours after being warmed up to normal temperature.After reaction terminates, reaction is quenched under ice-water bath, then being extracted with water and dichloromethane has Machine phase, merges organic phase drying and is spin-dried for, obtains product.
(2) take 9- boric acid pyrene (0.6g, 2.2mol, 1 equivalent) and 2- (2'-4- bromophenols) benzothiazole (0.36g, 3.3mmol, 1.5 equivalents) the mixing volume ratio that is dissolved in 30ml tetrahydrofurans and toluene is 1:In 1 mixed solution.Add catalysis Agent Pd (pph3)4.Lucifuge leads to nitrogen, and it is the potassium carbonate of 2mol/L and the aqueous solution of potassium fluoride to add 10ml concentration.At 120 DEG C Under conditions of react 60 hours.After reaction terminates, organic phase is extracted, merge organic phase and concentrate, entered by the method for chromatographic column Row separating-purifying, obtains yellow powder end-product.
Embodiment 5,
The preparation of 3- (2'- benzothiazoles) -4'- (1,2,2- triphenylethylenes) -4'- [1,1'- biphenyl]
(1) boration of the compound of conjugated structure containing aromatic hydrocarbons:Under nitrogen protection, bromo tetraphenyl ethylene is dissolved in dry four Hydrogen furans, is placed in be cooled in dry ice acetone bath under -78 DEG C, low temperature and adds n-BuLi, bromo tetraphenyl ethylene and n-BuLi Adding proportion be 1:1.2, after stirring 3 hours, add the positive tri butyl ester of boric acid, boration to continue to react 0.5 hour, remove dry Ice acetone bath, reacts 18 hours after being warmed up to normal temperature.After reaction terminates, reaction is quenched under ice-water bath, then with water and dichloro Methane extracts organic phase, and organic phase is merged into drying is spin-dried for, and obtains product.
(2) take boric acid tetraphenyl ethylene (0.5g, 1.9mol, 1 equivalent) and 2- (2'-4- bromophenols) benzothiazole (0.65g, 1.9mmol, 1 equivalent) the mixing volume ratio that is dissolved in 40ml tetrahydrofurans and toluene is 1:In 1 mixed solution.Add catalyst Pd(pph3)4.Lucifuge leads to nitrogen, and it is the potassium carbonate of 2mol/L and the aqueous solution of potassium fluoride to add 10ml concentration.In 90 DEG C of bar Reacted 48 hours under part.After reaction terminates, organic phase is extracted, merge organic phase and concentrate, divided by the method for chromatographic column From purification, pale yellow powder shape end-product is obtained.
Embodiment 6,
The present embodiment is the measure of the compound spectra prepared to embodiment 2 and embodiment 3.
The compound of embodiment 2 and embodiment 3 is made into 1 μM of standard of tetrahydrofuran solution.It is purple using Shimadzu -3150 Outer visible spectrophotometer and RF-520XPC XRFs carry out the measure of absorption spectrum and emission spectrum.Photoluminescence spectra is Go out what is measured in the absorption maximum of UV absorption.As shown in Figure 3 and Figure 4, as seen from the figure, the absorption of two compounds and fluorescence weight Not there is overlap even in folded scope very little, illustrate that the two materials have the advantages that stoke shift is big.
Embodiment 6,
The present embodiment is the measure of the compound electrochemistry prepared to embodiment 2 and embodiment 3.
Electrochemistry cyclic voltammetric (CV) experiment is in B.V.AUTOLABpotentiostat volt-amperes point of an Eco Chemie Completed in analyzer, using three-electrode system, including platinum carbon electrode, Ag/Ag+For reference electrode, platinum filament are to electrode.Aoxidized , used as solvent, reduction process is using tetrahydrofuran as solvent, hexafluoro phosphorus TBuA (Bu for Cheng Caiyong dichloromethane4N+PF6 -) Used as supporting electrolyte, concentration is 0.1M.All electrochemistry experiments are all carried out in nitrogen atmosphere at normal temperatures, voltage scanning Speed 0.1V/S.Using ferrocene (FOC) as benchmark, material can be calculated by the beginning voltage for measuring oxidation and reduction process The HOMO and lumo energy of material.
The position of the redox peaks of material is can be seen that from Electrochemical results Fig. 5, then by formula:
HOMO=- [EOX–EFe/Fe++4.8]
LUMO=- [ERE–EFe/Fe++4.8]
The HOMO and lumo energy that calculating can obtain the material of embodiment 2 are respectively -5.44eV and -3.40eV.Embodiment 3 The HOMO and lumo energy of material are respectively -5.26eV and -3.44eV.

Claims (10)

1. a kind of 4 2- (2'- hydroxy phenyls) benzoxazole compounds containing substituted base, it is characterised in that the compound formula For:
In formula:X is S, O or NH, and Ar is the unit of conjugated structure containing aromatic hydrocarbons, and the unit of conjugated structure containing aromatic hydrocarbons is selected from following substitution One kind in based structures:
2. a kind of 4 as claimed in claim 1 containing substituted base 2- (2'- hydroxy phenyls) benzoxazole compound preparation side Method, it is characterised in that the preparation method is concretely comprised the following steps:
(1) preparation of the unit of conjugated structure containing aromatic hydrocarbons:Under nitrogen protection, aryl bromide is dissolved in dry organic solvent, temperature Degree adds n-BuLi under the conditions of being less than -40 DEG C, after stirring 2 to 4 hours, boration, and continuation reaction 15 is arrived after being warming up to normal temperature 20 hours.After reaction terminates, organic phase is extracted, organic phase is merged into drying is spin-dried for, and obtains product;
(2) by product and 2- (2'-4- bromophenols) benzothiazole of step (1), palladium catalyst is dissolved in organic solvent, is subsequently adding one Quantitative strong alkali aqueous solution, the lower reaction of nitrogen protection, after reaction terminates, extracts organic phase, merges organic phase and concentrates, and separation is carried After pure, end-product is obtained.
3. preparation method according to claim 2, it is characterised in that:According to the molar ratio, in step (1), aryl bromide and The ratio of n-BuLi is 1:0.9~1.5;In step (2), polycyclic aromatic hydrocarbon and 2- (2'-4- bromophenols) benzo of the bromo The ratio of azoles is 1:0.5~1.5.
4. preparation method according to claim 3, it is characterised in that:According to the molar ratio, in step (1), aryl bromide and The ratio of n-BuLi is 1:1.2;In step (2), the ratio of the aryl bromide and 2- (2'-4- bromophenols) benzothiazole is 1: 1。
5. the preparation method according to claim 2,3 or 4, it is characterised in that:Described 2- (2'-4- bromophenols) benzothiazole The formula of compound is:
Wherein X is S, O or NH.
6. preparation method according to claim 2, it is characterised in that:Reaction dissolvent in step (1) is tetrahydrofuran;Step Suddenly the reaction dissolvent in (2) is that the volume ratio of tetrahydrofuran and toluene is 1:1 mixed solvent.
7. preparation method according to claim 2, it is characterised in that:The adding proportion of the aryl bromide and organic solvent It is 1 mole:2~8 liters.
8. preparation method according to claim 7, it is characterised in that:The adding proportion of the aryl bromide and organic solvent It is 1 mole:4~6 liters.
9. a kind of purposes of the arene compounds of 2- according to claim 1 (2'- hydroxy phenyls) benzothiazole, its feature It is:Described compound can be used in white light organic diode device.
10. purposes according to claim 9, it is characterized in that:Described compound mixing blue light material composition binary is complementary Color, can be with the single layer white light device of preparation process is simple.
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CN107573926B (en) * 2017-09-01 2020-09-01 南京邮电大学 Dual-luminescence organic fluorescence temperature sensing film and preparation method thereof
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CN111825634A (en) * 2020-08-02 2020-10-27 华中科技大学同济医学院附属协和医院 Novel compounds, process for their preparation and their use
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CN113480493A (en) * 2021-05-20 2021-10-08 南京邮电大学 Organic yellow fluorescence excited state proton transfer material and OLED device thereof
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CN113563325B (en) * 2021-05-24 2023-07-04 南京邮电大学 ESIPT luminescent material with high exciton utilization rate and preparation method and application thereof
CN114456161A (en) * 2022-02-16 2022-05-10 长春海谱润斯科技股份有限公司 Imidazole derivative and organic electroluminescent device thereof
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