CN115772181B - Dysprosium single-molecule magnet material based on bisacylhydrazone and preparation method thereof - Google Patents
Dysprosium single-molecule magnet material based on bisacylhydrazone and preparation method thereof Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 60
- 229910052692 Dysprosium Inorganic materials 0.000 title claims abstract description 53
- KBQHZAAAGSGFKK-UHFFFAOYSA-N dysprosium atom Chemical compound [Dy] KBQHZAAAGSGFKK-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- DGEZNRSVGBDHLK-UHFFFAOYSA-N [1,10]phenanthroline Chemical compound C1=CN=C2C3=NC=CC=C3C=CC2=C1 DGEZNRSVGBDHLK-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 7
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims description 33
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 33
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 24
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 13
- 239000003446 ligand Substances 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 239000011259 mixed solution Substances 0.000 claims description 8
- QXPQVUQBEBHHQP-UHFFFAOYSA-N 5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-4-amine Chemical compound C1CCCC2=C1SC1=C2C(N)=NC=N1 QXPQVUQBEBHHQP-UHFFFAOYSA-N 0.000 claims description 7
- 125000004429 atom Chemical group 0.000 claims description 7
- 239000000706 filtrate Substances 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 230000005291 magnetic effect Effects 0.000 abstract description 16
- 239000013078 crystal Substances 0.000 abstract description 11
- 239000000696 magnetic material Substances 0.000 abstract description 4
- 239000011232 storage material Substances 0.000 abstract 1
- 229910001220 stainless steel Inorganic materials 0.000 description 8
- 239000010935 stainless steel Substances 0.000 description 8
- 150000007857 hydrazones Chemical class 0.000 description 6
- 239000000203 mixture Substances 0.000 description 4
- -1 polytetrafluoroethylene Polymers 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- 238000004729 solvothermal method Methods 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 238000012937 correction Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000002447 crystallographic data Methods 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910021644 lanthanide ion Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000010408 sweeping Methods 0.000 description 2
- GPAAEXYTRXIWHR-UHFFFAOYSA-N (1-methylpiperidin-1-ium-1-yl)methanesulfonate Chemical compound [O-]S(=O)(=O)C[N+]1(C)CCCCC1 GPAAEXYTRXIWHR-UHFFFAOYSA-N 0.000 description 1
- 241000238366 Cephalopoda Species 0.000 description 1
- 150000000914 Dysprosium Chemical class 0.000 description 1
- 239000002262 Schiff base Substances 0.000 description 1
- 150000004753 Schiff bases Chemical class 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 230000005290 antiferromagnetic effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- WARCRYXKINZHGQ-UHFFFAOYSA-N benzohydrazide Chemical compound NNC(=O)C1=CC=CC=C1 WARCRYXKINZHGQ-UHFFFAOYSA-N 0.000 description 1
- 230000004071 biological effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- NLQFUUYNQFMIJW-UHFFFAOYSA-N dysprosium(III) oxide Inorganic materials O=[Dy]O[Dy]=O NLQFUUYNQFMIJW-UHFFFAOYSA-N 0.000 description 1
- 238000012921 fluorescence analysis Methods 0.000 description 1
- 230000005525 hole transport Effects 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000000634 powder X-ray diffraction Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000001338 self-assembly Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Nitrogen Condensed Heterocyclic Rings (AREA)
Abstract
The invention relates to the technical field of magnetic materials, in particular to a dysprosium single-molecule magnet material based on bisacylhydrazone and a preparation method thereof. Dysprosium single-molecule magnet material based on bisacylhydrazone has a chemical formula of [ Dy 2(HL)2]·2CH3OH·CH3CN,, wherein HL is 2, 9-diphthalic acylhydrazone phenanthroline losing three protons. The dysprosium single-molecule magnet material crystal based on bisacylhydrazone belongs to a triclinic system, P-1 space group and unit cell parameter a＝12.3932(6)Å,b＝15.0551(10)Å,c＝15.5316(10)Å,α＝91.075(3)°,β＝100.739(2)°,γ＝111.8726(19)°,V＝2629.8(3)Å3. the dysprosium single-molecule magnet material based on bisacylhydrazone has single-molecule magnet characteristics, and the preparation method is simple and convenient, high in yield, good in reproducibility and low in cost, and is expected to be used for novel magnetic storage materials.
Description
Technical Field
The invention relates to the technical field of magnetic materials, in particular to a dysprosium single-molecule magnet material based on bisacylhydrazone and a preparation method thereof.
Background
A single-molecule magnet is a special metal compound that can be switched between two states of "0" and "1" like a tiny magnet at a specific low temperature, and can be used to store information. Compared with the conventional magnet, the single-molecule magnet is obviously smaller, which means that the storage device manufactured by the magnet has stronger data storage capacity, has wide application prospect in the fields of super-close storage, quantum computation and the like, and has obvious huge commercial and industrial values. Currently, single-molecule magnets have become one of the research hotspots in the fields of chemistry, physics, material science, and the like.
Acylhydrazone is a special Schiff base which has strong coordination capacity, various coordination forms and good biological activity, so that the acylhydrazone is widely focused on new materials, pesticides, medicines, analytical reagents and the like. In addition, acylhydrazone compounds are also used in the fields of fluorescence analysis, hole transport materials, luminescent materials, magnetic research and the like. Therefore, acylhydrazone compounds have become one of the research hotspots in the contemporary chemistry and materials world.
Prior to the work of this patent application, there has been no report on patent literature and scientific papers on the self-assembly of 2, 9-diphoshizoyl hydrazone phenanthroline and dysprosium nitrate in a mixed solvent of methanol/acetonitrile to form a single-molecule magnet.
Disclosure of Invention
The invention aims to provide a dysprosium single-molecule magnet material based on bisacylhydrazone.
Another object of the invention is to provide a method for preparing the dysprosium single-molecule magnet material based on bisacylhydrazone.
The technical problems to be solved by the invention are realized by the following technical scheme:
Dysprosium single-molecule magnet material based on bisacylhydrazone, the chemical formula is [ Dy 2(HL)2]·2CH3OH·CH3 CN, the molecular formula is C 60H45Dy2N13O10,, HL is bisacylhydrazone ligand 2, 9-diphthalic hydrazone phenanthroline losing three protons, and the structural formula of the 2, 9-diphthalic hydrazone phenanthroline is as follows:
The dysprosium single-molecule magnet material based on bisacylhydrazone belongs to a triclinic system, P-1 space group, and the unit cell parameters are as follows a＝12.3932(6)Å,b＝15.0551(10)Å,c＝15.5316(10)Å,α＝91.075(3)°,β＝100.739(2)°,γ＝111.8726(19)°,V＝2629.8(3)Å3.
Further, in the asymmetric structural unit of the dysprosium single-molecule magnet material based on bisacylhydrazone, there are two independent crystallographic Dy (III) metal centers (Dy 1 and Dy 2), both in the common position, with a similar N 4O5 coordination environment, coordinated with 4N atoms from one bisacylhydrazone ligand and 5O atoms from two different bisacylhydrazone ligands in nine coordination. Dy-O bonds have bond lengths ranging from 2.174 (4) to 2.725 (4) A and Dy-N bonds have bond lengths ranging from 2.574 (5) to 2.737 (5) A. Each asymmetric structural unit comprises 2 metal center Dy 3+ ions, 2 deprotonated bisacylhydrazone ligands HL 3-, 2 free methanol molecules and 1 solvent acetonitrile molecule.
Further, two metal centers Dy (III) are bridged by three single μ 2 -O atoms to form a triangle bipyramid Dy 2O3 core, with two Dy (III) metal centers separated by 3.9881 (4) a (Dy 1 ⋯ Dy 2).
A preparation method of dysprosium single-molecule magnet material based on bisacylhydrazone comprises the following steps: adding 2, 9-di-o-hydroxy phenylhydrazone phenanthroline and dysprosium nitrate into a mixed solution of methanol and acetonitrile, dropwise adding a small amount of triethylamine, fully stirring, filtering, placing filtrate into a high-pressure reaction kettle, heating under solvothermal conditions, and slowly cooling to obtain the dysprosium single-molecule magnet material based on bisacylhydrazone.
Further, the heating temperature is 60-80 ℃.
Further, the heating reaction time is 48-96 hours.
Further, the temperature is reduced to be between 2 and 10 ℃ per hour, and the temperature is reduced to the room temperature.
Further, the volume ratio of the mixed solution of methanol to acetonitrile is 3:1.
Further, the volume ratio of the mole number of the 2, 9-diphthalic acylhydrazone phenanthroline to the triethylamine in the solution is 1mmol to 1mL.
Further, the molar ratio of the 2, 9-di-o-hydroxy benzoyl hydrazone phenanthroline to dysprosium nitrate is 0.8-1.0:0.8-1.0.
Further, the molar ratio of the 2, 9-diphthalic acylhydrazone phenanthroline to dysprosium nitrate is preferably 1:1.
The invention has the beneficial effects that:
the dysprosium single-molecule magnet material based on the bisacylhydrazone has stable yellow fluorescence for the first time under solvothermal conditions, as shown in fig. 5, and can be used as a potential fluorescent material; as shown in fig. 6, the dysprosium single-molecule magnet material based on bisacylhydrazone has better chemical stability, and provides a foundation for the dysprosium single-molecule magnet material as a potential functional material; as shown in fig. 8-12, the compound has single molecule magnet characteristics and can be used for preparing magnetic materials; the preparation method of the dysprosium single-molecule magnet material based on the bisacylhydrazone has the advantages of simplicity and convenience in operation, high yield and good reproducibility.
Drawings
FIG. 1 is a diagram of the coordination environment of a metal center in the crystal structure of a dysprosium single-molecule magnet material based on bisacylhydrazone according to the invention;
FIG. 2 is a diagram of the coordination environment of bisacylhydrazone ligands in the crystal structure of dysprosium single-molecule magnet material based on bisacylhydrazone according to the invention;
FIG. 3 is an infrared spectrum of a dysprosium single-molecule magnet material based on bisacylhydrazone according to the invention;
FIG. 4 is an X-ray powder diffraction pattern of a dysprosium single-molecule magnet material based on bisacylhydrazone according to the invention;
FIG. 5 is a solid state fluorescence diagram of dysprosium single-molecule magnet material based on bisacylhydrazone according to the invention;
FIG. 6 is a powder diffraction pattern of a bisacylhydrazone-based dysprosium single molecule magnet material immersed in various common solvents according to the invention;
FIG. 7 shows a DC temperature change susceptibility curve of a dysprosium single-molecule magnet material based on bisacylhydrazone according to the invention;
FIG. 8 is a graph of temperature profiles of real parts of different alternating magnetic susceptibility of dysprosium single-molecule magnet materials based on bisacylhydrazone according to the invention;
FIG. 9 is a graph of temperature profiles of imaginary parts of different alternating magnetic susceptibility of dysprosium single-molecule magnet materials based on bisacylhydrazone according to the invention;
FIG. 10 is a graph of the frequency of the real parts of different alternating magnetic susceptibility of dysprosium single-molecule magnet materials based on bisacylhydrazone according to the invention;
FIG. 11 is a graph of the frequency of the imaginary parts of different alternating magnetic susceptibility of dysprosium single-molecule magnet materials based on bisacylhydrazone according to the invention;
Fig. 12 is a graph of relaxation time versus temperature for a bisacylhydrazone-based dysprosium single molecule magnet material according to the invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
Example 1:
0.1mmol of 2, 9-diphthalic acylhydrazone phenanthroline and 0.1mmol of Dy (NO 3)3·6H2 O) are dissolved in 20mL of mixed solution of methanol and acetonitrile (V: V=1:1), 0.1mL of triethylamine is dropwise added, the mixture is sufficiently stirred at normal temperature for 60min and then filtered, the filtrate is transferred into a stainless steel reaction kettle which is lined with polytetrafluoroethylene, the stainless steel reaction kettle is sealed and then placed into an oven, solvothermal reaction is carried out at 70 ℃ for 48h, then the temperature is reduced to room temperature at 2 ℃/h, the red blocky crystal of the dysprosium single-molecule magnet material based on the bisacylhydrazone is obtained after filtering and washing, and the yield is 47.4% (based on Dy).
The dysprosium single-molecule magnet material crystal based on bisacylhydrazone prepared in the example is characterized by comprising the following steps:
The crystal X-ray diffraction data were measured using Bruker Smart Apex CCD single crystal diffractometer. Diffraction data were collected using graphite-monochromised Mo kα rays (λ= 0.071073 nm) as radiation source at 293K. The scanning mode is phi-omega scanning, and Lp factor correction and empirical absorption correction are carried out. And determining the position coordinates of the metal atoms and the non-hydrogen atoms by adopting a direct method, and carrying out full matrix least square correction on all the non-hydrogen atom coordinates and anisotropic thermal parameters thereof. The crystallographic parameters are shown in Table 1, the structures are shown in FIG. 1 and FIG. 2.
Main crystallographic data of dysprosium single-molecule magnet material based on bisacylhydrazone prepared in table 1
The chemical formula of the dysprosium single-molecule magnet material based on bisacylhydrazone is [ Dy 2(HL)2]·2CH3OH·CH3 CN, the molecular formula is C 60H45Dy2N13O10,, and HL is bisacylhydrazone ligand 2, 9-diphthalic acylhydrazone phenanthroline losing three protons. The dysprosium single-molecule magnet material crystal based on bisacylhydrazone belongs to a triclinic system, P-1 space group, unit cell parameter is a＝12.3932(6)Å,b＝15.0551(10)Å,c＝15.5316(10)Å,α＝91.075(3)°,β＝100.739(2)°,γ＝111.8726(19)°,V＝2629.8(3)Å3., two independent crystallographic Dy (III) metal centers (Dy 1 and Dy 2) exist in an asymmetric structural unit of the dysprosium single-molecule magnet material based on bisacylhydrazone, the metal centers have similar N 4O5 coordination environment, and the metal centers are coordinated with 4N atoms from one bisacylhydrazone ligand and 5O atoms from two different bisacylhydrazone ligands in a nine-coordination mode, and the metal centers are shown in fig. 1 and 2. The two metal centers Dy (III) are connected by three single mu 2 -O atom bridges to form a triangular bipyramid Dy2O3 core, and the distance between the two Dy (III) metal centers Dy1 ⋯ Dy2 is 3.9881 (4) A.
The magnetic properties of dysprosium single-molecule magnet materials based on bisacylhydrazone prepared in this example were studied as follows:
The magnetic measurement adopts a superconducting Quantum interferometer Quantum DESIGN MPMS SQUID VSM magnetic measurement system. The test temperature of the DC magnetic susceptibility is 2.0-300K, the magnetic field is 0.1T, the DC temperature-changing magnetic susceptibility curve is shown in FIG. 7, when T=300K, the X M T value is 28.36 cm 3K mol −1, and the theoretical value 28.34 cm 3 K mol−1 corresponding to 2 free Dy (III) ions (g=4/3, 6H 15/2) is consistent. The behavior of the χ M T value steadily decreasing in the range of 300-50K with decreasing temperature, while the value starts to decrease sharply when the temperature is below 50K, the χ M T value reaching a minimum of 9.02 cm 3 K mol−1.χM T value with decreasing temperature is probably due to pyrolytic accommodation of the statank sublevel of the lanthanide ion or antiferromagnetic interaction between the lanthanide ions in the complex.
Further researching the dynamic magnetic behavior of the dysprosium single-molecule magnet material based on bisacylhydrazone prepared in the example, firstly, carrying out a temperature sweeping alternating-current magnetic susceptibility test on the dysprosium single-molecule magnet material in a temperature range of 2-20K under a zero direct-current field, and experimental results show that both a real part signal (figure 8) and an imaginary part signal (figure 9) of the material show frequency dependence, and preliminarily judging the single-molecule magnet behavior of the prepared substance in the example. In the temperature range of 2-10K, the test of the frequency sweeping alternating current magnetic susceptibility is carried out, and from the experimental result, both the real part (figure 10) and the imaginary part (figure 11) of the alternating current magnetic susceptibility curve show temperature dependence, so that the single-molecule magnet behavior of the prepared substance is further shown. By plotting the relaxation time (tau) and the temperature (T), as shown in fig. 12, arrhenius fitting is performed on the data of the high temperature region, and the potential energy barrier of the dysprosium single-molecule magnet is U eff/kB = 29.45K, and the pre-finger factor is tau 0 = 4.16 × 10−7 s; the pre-finger factor is in the normal range of single molecule magnets (10 −6 −10−12 s).
In conclusion, the dysprosium single-molecule magnet material based on bisacylhydrazone prepared by the invention shows obvious temperature dependence and frequency dependence phenomena under a zero field, generates typical slow relaxation behavior, has the characteristic of single-molecule magnet, can be used as a molecule-based magnetic material, and is applied to novel high-density information storage equipment.
Example 2:
0.08mmol of 2, 9-dihydroxybenzoyl hydrazone phenanthroline and 0.1mmol of Dy (NO 3)3·6H2 O) are dissolved in 20mL of mixed solution of methanol and acetonitrile (V: V=1:1), 0.08mL of triethylamine is dropwise added, the mixture is sufficiently stirred at normal temperature for 60min and then filtered, the filtrate is transferred into a stainless steel reaction kettle which is lined with polytetrafluoroethylene, the stainless steel reaction kettle is sealed and then placed into an oven for solvothermal reaction at 80 ℃ for 96h, then the temperature is reduced to room temperature at 2 ℃/h, the red blocky crystal of the dysprosium single-molecule magnet material based on the bisacyl hydrazone is obtained after filtering and washing, and the yield is 41.8% (based on Dy).
Example 3:
0.11mmol of 2, 9-dihydroxybenzoyl hydrazone phenanthroline and 0.1mmol of Dy (NO 3)3·6H2 O) are dissolved in 20mL of mixed solution of methanol and acetonitrile (V: V=1:1), 0.11mL of triethylamine is dropwise added, the mixture is sufficiently stirred at normal temperature for 60min and then filtered, the filtrate is transferred into a stainless steel reaction kettle which is lined with polytetrafluoroethylene, the stainless steel reaction kettle is sealed and then placed into an oven, solvothermal reaction is carried out for 96h at 70 ℃, then the temperature is reduced to room temperature at 10 ℃/h, the red blocky crystal of the dysprosium single-molecule magnet material based on the bisacylhydrazone is obtained after filtering and washing, and the yield is 46.2% (based on Dy).
Example 4:
0.1mmol of 2, 9-diphthalic acylhydrazone phenanthroline and 0.1mmol of Dy (NO 3)3·6H2 O) are dissolved in 20mL of mixed solution of methanol and acetonitrile (V: V=1:1), 0.1mL of triethylamine is dripped, the mixture is fully stirred at normal temperature for 60min and then filtered, the filtrate is transferred into a stainless steel reaction kettle which is lined with polytetrafluoroethylene, the stainless steel reaction kettle is sealed and then placed into an oven for solvothermal reaction at 60 ℃ for 48h, then the temperature is reduced to room temperature at 5 ℃/h, the red blocky crystal of the dysprosium single-molecule magnet material based on the dihydrazone is obtained after filtering and washing, and the yield is 45.8% (based on Dy).
The above examples only show embodiments of the present invention, and the description thereof is more specific and detailed, but should not be construed as limiting the scope of the invention, but all technical solutions obtained by equivalent substitution or equivalent transformation shall fall within the scope of the invention.
Claims (6)
1. A dysprosium single-molecule magnet material based on bisacylhydrazone has a chemical formula of [ Dy 2(HL)2]·2CH3OH·CH3 CN, wherein HL is bisacylhydrazone ligand 2, 9-diphthalic acylhydrazone phenanthroline losing three protons, and is characterized in that the dysprosium single-molecule magnet material based on bisacylhydrazone belongs to a triclinic system, P-1 space group, and unit cell parameters are that α＝91.075(3)°，β＝100.739(2)°，γ＝111.8726(19)°，Wherein, two independent crystallographic Dy (III) metal centers Dy1 and Dy2 exist in an asymmetric structural unit of the dysprosium single-molecule magnet material of the bisacylhydrazone, have similar N 4O5 coordination environments, and coordinate with 4N atoms from one bisacylhydrazone ligand and 5O atoms from two different bisacylhydrazone ligands in a nine coordination mode; the two metal centers Dy (III) are connected by three single mu 2 -O atom bridges to form a triangle double-cone Dy 2O3 nucleus, and the distance between the two Dy (III) metal centers Dy1 … Dy2 is
2. The preparation method of the dysprosium single-molecule magnet material based on bisacylhydrazone according to claim 1, comprising the following steps: adding 2, 9-di-o-hydroxy phenylhydrazone phenanthroline and dysprosium nitrate into a mixed solution of methanol and acetonitrile, dropwise adding a small amount of triethylamine, fully stirring, filtering, placing filtrate into a high-pressure reaction kettle, heating under solvothermal conditions, and slowly cooling to obtain the dysprosium single-molecule magnet material based on bisacylhydrazone.
3. The method for preparing the dysprosium single-molecule magnet material based on bisacylhydrazone according to claim 2, wherein the molar ratio of the 2, 9-diphthalic acylhydrazone phenanthroline to dysprosium nitrate is 0.8-1.0:0.8-1.0.
4. The method for preparing the dysprosium single-molecule magnet material based on bisacylhydrazone according to claim 2, wherein the molar ratio of 2, 9-diphthalic acylhydrazone phenanthroline to dysprosium nitrate is 1:1.
5. The method for preparing the dysprosium single-molecule magnet material based on bisacylhydrazone according to claim 2, wherein the volume ratio of methanol to acetonitrile in the mixed solution of methanol and acetonitrile is 3:1.
6. The method for preparing the dysprosium single-molecule magnet material based on bisacylhydrazone according to claim 2, wherein the volume ratio of the mole number of the 2, 9-diphthalic acylhydrazone phenanthroline to the triethylamine is 1 mmol/1 mL.
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