CN113201018A - Mn (II) complex with AIE property and living cell mitochondria targeting function and preparation method and application thereof - Google Patents
Mn (II) complex with AIE property and living cell mitochondria targeting function and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a Mn (II) complex with AIE (aluminum selenide) property and a living cell mitochondria targeting function, a preparation method and application thereof, relating to the technical field of multiphoton absorption materials, FD-MnCl for short2The structural formula is as follows:the novel terpyridine Mn (II) complex synthesized by the invention is a multi-photon absorption material with a cell developing function, and compared with other materials, the complex has the characteristics of larger three-photon absorption cross section, low excitation energy, long wavelength, strong penetrability, small light damage and the like, can be used for multi-photon biological imaging, and has obvious application value.
Description
The technical field is as follows:
the invention relates to the technical field of multi-photon absorption materials, in particular to a Mn (II) complex with AIE (aluminum selenide) property and a living cell mitochondria targeting function, and a preparation method and application thereof.
Background art:
multiphoton absorption is a nonlinear optical effect. Under irradiation of a high intensity laser beam, it is possible for a substance to absorb several, even tens of photons simultaneously, a process known as multiphoton absorption. Compared with the traditional single photon absorption, the multiphoton absorption has obvious advantages in the fields of three-dimensional controllability, photolytic drug release, bioluminescence labeling, multiphoton fluorescence microscopy (MPFM) and the like, thereby attracting great interest of researchers.
However, since most of the existing organic materials have a small multiphoton absorption cross section, a short absorption wavelength and limited application prospects, finding multiphoton absorption materials with a large absorption cross section and a long wavelength has become a hot spot in the field of nonlinear optics, and therefore multiphoton complexes with various structures, unique properties and simple synthesis have attracted extensive attention of researchers.
The transition metal complex has good photophysical properties such as high quantum yield, large Stokes shift, narrow emission peak, long luminescence life and the like (Angew. chem. int. Ed.,2020,59, 15987-. The multiphoton optically active complex material is designed and synthesized simply and effectively by changing the structure of the ligand to change the photophysical and other properties of the complex.
Based on the consideration, the terpyridine ligand with strong chelating capacity and Mn (II) form a complex, anilino and butyl introduced on the terpyridine ligand have rich electrons, and halogen is introduced to serve as auxiliary coordination atoms to form a D-A structure, so that the push-pull electron capacity is improved, and the multiphoton absorption property of the complex is enhanced.
The invention content is as follows:
the invention aims to solve the technical problem of providing a Mn (II) complex with AIE property and a living cell mitochondria targeting function, a preparation method and application thereof.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
mn (II) complex with AIE property and living cell mitochondria targeting function, FD-MnCl for short2The structural formula is as follows:
the preparation method of the Mn (II) complex with the AIE property and the function of targeting living cell mitochondria uses N, N-dibutylaniline as the initial raw material, and firstly uses the N, N-dibutylaniline and POCl3Reacting to obtain compound O, reacting with 2-acetylpyridine to obtain compound FD, and reacting with MnCl2Reacting to obtain complex FD-MnCl2。
The synthetic route is as follows:
the N, N-dibutylaniline is reacted with DMF and POCl3In a molar ratio of 1:3: 5.
The molar ratio of the compound O to the 2-acetylpyridine is 1: 2-5.
The compounds FD and MnCl2The molar ratio of (A) to (B) is 1: 1-3.
Use of the above mn (ii) complex having AIE properties and a function of targeting living cell mitochondria as a multiphoton absorbing material.
The 2,2:6', 2' -tripyridine is a compound containing polypyridine heterocycle, has stronger coordination capacity to transition metal ions Mn (II), and N, N-dibutyl group has strong electron-donating capacity, thereby being beneficial to intramolecular charge transfer and regulating the luminescence of the complex. The halogen atom is used as an auxiliary coordination atom, so that the electron pushing and pulling capability of the complex can be improved, and the nonlinear optical property can be enhanced (Dyes and pigments, 2015,117, 7-15). Moreover, the complex designed in the invention has the property of multi-photon Aggregation Induced Emission (AIE), and overcomes the fluorescence quenching (ACQ) caused by self-aggregation of most complexes at high concentration. Moreover, the complex can enter cells in a short time under the excitation wavelength of 800nm, penetrate cell membranes, display two-photon fluorescence in mitochondria, can be used for qualitatively tracking liver cancer cells, and the research result has great significance for life science research.
The invention has the beneficial effects that:
1. the novel terpyridine Mn (II) complex synthesized by the invention is a multi-photon absorption material with a cell developing function. The anilino and the butyl have abundant electrons, so that intramolecular charge transfer is facilitated, and the luminescence of the complex is adjusted. Halogen atoms are introduced, the electron push-pull capability is improved, and the nonlinear optical property is enhanced. Compared with other materials, the complex has the characteristics of larger three-photon absorption cross section, low excitation energy, long wavelength, strong penetrability, small light damage and the like, can be used for multi-photon biological imaging, and has obvious application value.
2. Study of the Complex FD-MnCl Using the open-cell Z-Scan method and fluorescence contrast2Multi-photon absorption properties of (a). FD-MnCl at 800nm excitation wavelength using an open-cell Z-scan method2The maximum two-photon absorption cross section of the optical film reaches 1970.63 GM; FD-MnCl at an excitation wavelength of 1450nm2The maximum three-photon absorption cross section of the material reaches 2.09 multiplied by 10-75cm6s2photon-2(ii) a FD-MnCl at an excitation wavelength of 700nm using fluorescence contrast2The maximum two-photon absorption cross section of the material reaches 121.63GM, and the material has FD-MnCl at the excitation wavelength of 1450nm2The maximum three-photon absorption cross section of the material reaches 2.07 multiplied by 10-81cm6s2photon-2。
3. Mn (II) Complex FD-MnCl of the present invention2Having multiphoton AIE properties, three in aggregatePhoton fluorescence is significantly enhanced. As the water content increased from 0% to 70%, the fluorescence intensity did not change and the emission position was at 525 nm. Solute molecules keep a monomolecular state and do not form polymerization, but the fluorescence intensity is obviously enhanced along with the continuous increase of water content, when H is2FD-MnCl at 1450nm excitation wavelength when O reaches 80%2Has a three-photon absorption cross section of 9.68X 10-80cm6s2photon-246 times the initial absorption cross section. This phenomenon is caused by FD-MnCl2The formation of nano-polymers in water results in a decrease in solubility, activating intramolecular rotation (RIR) limited processes.
4. Coordination compound FD-MnCl by using laser confocal microscope2Cell imaging studies were performed. FD-MnCl in a short time when 800nm is used as an excitation wavelength2Enters HepG2 cells (liver cancer cells) and has two-photon fluorescence signals, which indicates that the complex FD-MnCl2Has strong cell permeability. To confirm the complex FD-MnCl2Targeting the site of the cell using the commercial dye Mito tracker redTMThe result of the co-localization development showed FD-MnCl2And Mito tracker redTMThe coloring part and phenomenon of FD-MnCl are consistent2Mitochondria of living cells can be targeted. The results of this study indicate the potential of the complex for two-photon bio-imaging applications.
5. The manganese terpyridine complex has the advantages of easily available raw materials, low price, short synthetic route and mild synthetic conditions.
Description of the drawings:
in figure 1 is complex FD-MnCl2Crystal structure diagram.
FIG. 2 (a-f) is a graph of the study of complex FD-MnCl using open-cell Z-scan method and fluorescence contrast method2Two/three photon absorption spectra in DMSO solvent (c ═ 10)-3mol/L). Graph a FD-MnCl using an open-cell Z-scan method at an excitation wavelength of 800nm2Maximum two-photon absorption cross-sectional view of (a); panel b FD-MnCl using an open-cell Z-scan method at an excitation wavelength of 1450nm2Maximum three-photon absorption cross-sectional view; panel c fluorescence contrast method at 680-8FD-MnCl at 60nm excitation wavelength2The two-photon fluorescence spectrum of (1); d picture FD-MnCl using fluorescence contrast method with 680-860nm as excitation wavelength2A two-photon absorption cross-sectional view of (a); the e-diagram uses fluorescence contrast method, FD-MnCl at 1150-1550nm as the excitation wavelength2The three-photon fluorescence spectrum of (a); the f diagram uses fluorescence contrast method, uses 1150-1550nm as excitation wavelength, FD-MnCl2Three photon absorption cross section.
FIG. 3 (a-b) Complex FD-MnCl2In different proportions (0% -90%, 98%) of CH3OH/H2Single photon fluorescence spectroscopy in O-mixed solvents (c ═ 10)-5mol/L); (c) under the excitation wavelength of 800nm, the complex FD-MnCl2In 0% -90%, 98% CH3OH/H2Two-photon fluorescence spectrum in O (c ═ 10)-3mol/L). (d) Under the excitation wavelength of 800nm, the complex FD-MnCl2In 0% -90%, 98% CH3OH/H2A two-photon absorption cross-sectional view in a mixed solvent of O; (e) FD-MnCl at an excitation wavelength of 1450nm2In 0% -90%, 98% CH3OH/H2Three-photon fluorescence spectrum in O (c ═ 10)-3mol/L); (f) under the excitation wavelength of 1450nm, the complex FD-MnCl2In 0% -90%, 98% CH3OH/H2And a three-photon absorption cross-sectional view in a mixed solvent of O.
FIG. 4 shows a complex FD-MnCl2The two-photon fluorescence development image of (1) has an excitation wavelength of 800nm and a scale of 20 μm; wherein A is a two-photon development pattern when 800nm is used as the excitation wavelength and 450-490nm is used as the emission wavelength; b is Mito tracker red using 405nm as the excitation wavelength and 560-600nm as the emission wavelengthTMA single photon development pattern of (a); c is a single-double photon overlay; d is bright field cell visualization; all figures were obtained using Image J software.
The specific implementation mode is as follows:
in order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easy to understand, the invention is further explained by combining the specific embodiments and the drawings.
1. Preparation of Compound O
Ice salt bath conditionsNext, refined DMF (4.38g,0.06mol) was weighed in a 500mL round-bottomed flask, and POCl was added dropwise thereto using an isobaric dropping funnel3(15.30g,0.1mol), after the frozen salt is formed, weighing N, N-dibutylaniline (4.10g,0.02mol), dissolving with 50mL chloroform, pouring into the frozen salt, after the frozen salt is melted, refluxing at 65 ℃ for 6 h. After the reaction is completed, pouring the reactant into a large amount of ice water, adjusting the pH value to be neutral by using NaOH aqueous solution, extracting by using dichloromethane, and distilling off the solvent at normal pressure to obtain oily liquid. And (3) performing silica gel column chromatography on the crude product, eluting the crude product by using petroleum ether as a developing agent to obtain a first component, namely the required product, and distilling the developing agent to obtain light yellow oily liquid 3.0g with the yield of 64%.
2. Preparation of Compound FD
Weighing 2-acetylpyridine (3.03g,0.025mol) in a 500mL round-bottom flask, dissolving with an appropriate amount of ethanol, weighing potassium hydroxide (1.6g,0.04mol), dissolving with a small amount of water, adding into the system, weighing compound O (1.17g,0.005mol), dissolving with an appropriate amount of ethanol, adding into the system, stirring at normal temperature for 1h, dropwise adding 70mL of ammonia water by using a constant-pressure dropping funnel, refluxing at 80 ℃ for 6h, stopping heating (supplementing ammonia water once in the middle), removing part of solvent, and recrystallizing with ethanol to obtain a bright yellow solid 3.00g with a yield of 68%.1H NMR(400MHz,d6-acetone,ppm)δ8.76(dd,J=62.4,45.6Hz,4H),8.08–7.90(m,2H),7.44(t,J=25.5Hz,4H),7.27(t,J=16.5Hz,1H),7.17–6.94(m,1H),6.69(t,J=19.6Hz,2H),3.47–3.23(m,4H),1.58(t,J=18.5Hz,4H),1.38(dt,J=27.3,13.6Hz,4H),1.13–0.80(m,6H).13C NMR(100MHz,d6-acetone,ppm)δ154.19,151.80,148.26,139.25,128.79,124.05,119.73,111.53,53.49,30.07,21.77,13.79.MS(ESI-MS):calc:436.60,found:437.27([M]+H+)
3. Complex FD-MnCl2Preparation of
Manganese chloride (0.16g,1.0mmol) is weighed into a 100mL round-bottom flask, an appropriate amount of anhydrous acetonitrile is added to completely dissolve the manganese chloride, a solution of ligand FD (0.44g,1.0mmol) in acetonitrile (10Ml) is dropwise added under the condition of normal temperature, the reaction is stopped after stirring for 2h, and the manganese chloride is filtered to obtain an orange solid with a yield of 0.38 g: 76 percent.1H NMR(400MHz,d6-DMSO)δ8.75–8.53(m,6H),7.98(d,J=2.4Hz,2H),7.49(s,2H),6.79(s,2H),5.63–5.05(m,3H),1.83–1.46(m,5H),1.35–1.19(m,6H),0.91(t,J=7.4Hz,6H).13C NMR(100MHz,d6-DMSO)δ(ppm):161.14,152.17,151.35,149.58,138.96,138.24,135.23,129.40,128.74,122.89,118.57,117.71,53.72,31.34,21.26,14.26.FT-IR(KBr,cm-1):3908(m),3844(s),3768(m),3558(m),3431(s),2962(m),2886(m),2364(m),1583(s),1532(s),1469(s),1418(s),1360(s),1202(s),1017(s),795(s).
Analysis of the attached figures:
FIG. 1 shows a complex FD-MnCl2Crystal structure diagram, the exact structure of the molecule is proved. The hydrogen atoms and solvent molecules are deleted in order to clearly show the crystal structure. Complex FD-MnCl2The single crystal of (A) is obtained by a solvent evaporation method, and an appropriate amount of FD-MnCl is added2Dissolved in 10mL of dichloromethane, filtered into a 25mL conical flask, covered with 5mL of ethanol, and placed in a vibration-free dark environment to obtain orange-yellow prismatic crystals with a size of 0.30X 0.20mm after two weeks. In the complex FD-MnCl2In the crystal data of (2), the complex belongs to the P ī space group, triclinic system. N, N-butyl terpyridine is used as a main ligand to coordinate with central Mn, and two Cl ions are used as coordination atoms to coordinate with the central Mn. The coordinated ligand and the metal ion are positioned on the same plane, namely the part of N ^ N ^ N-Mn is positioned on the same plane.
Panel a of FIG. 2 uses the open-hole Z-scan method, FD-MnCl at an excitation wavelength of 800nm2The maximum two-photon absorption cross section of the optical film reaches 1970.63 GM; panel b FD-MnCl using an open-cell Z-scan method at an excitation wavelength of 1450nm2The maximum three-photon absorption cross section reaches 2.09 multiplied by 10-75cm6s2photon-2(ii) a The c diagram uses fluorescence contrast method, and uses 680-860nm as excitation wavelength, FD-MnCl2When 800nm is used as excitation wavelength, the two-photon fluorescence intensity of the two-photon fluorescence spectrum is strongest; d picture FD-MnCl using fluorescence contrast method with 680-860nm as excitation wavelength2The maximum two-photon absorption cross section of the optical film reaches 121.63 GM; the e-diagram uses fluorescence contrast method, FD-MnCl at 1150-1550nm as the excitation wavelength2Of three photonsFluorescence spectrum, when 1450nm is used as excitation wavelength, the three-photon fluorescence intensity is strongest; the f picture adopts fluorescence contrast method, and FD-MnCl takes 1500nm as excitation wavelength2The maximum three-photon absorption cross section reaches 2.55 multiplied by 10-81cm6s2photon-2。
4. AIE property test: configuring CH with different proportions3OH/H2O (water content from 0% to 90%, 98%). Measurement of Complex FD-MnCl2At different ratios of CH3OH/H2Single/multiphoton fluorescence spectrum in a mixed solvent of O.
FIG. 3 shows a complex FD-MnCl2At different ratios of CH3OH/H2O in a mixed solvent, and the multiphoton AIE properties thereof were investigated. From the a-b diagrams, it can be seen that2The O content is increased from 0% to 50%, the fluorescence intensity is not changed at 525nm, and when the water content is more than 50%, the fluorescence is enhanced, and 70% of the water content is reached, the complex FD-MnCl2The fluorescence intensity of (a) is maximal; c is the complex FD-MnCl at the excitation wavelength of 800nm2At different ratios of CH3OH/H2Two-photon fluorescence Spectroscopy in O-Mixed solvent when H2When the O content reaches 70%, the two-photon fluorescence intensity is maximum; d is a graph showing that the maximum two-photon absorption cross-section reached 67.77GM at an excitation wavelength of 800nm when the water composition reached 70% as calculated using fluorescence contrast; e diagram shows the complex FD-MnCl at the excitation wavelength of 1450nm2At different ratios of CH3OH/H2Three photon fluorescence Spectroscopy in O Mixed solvent when H2When the content of O reaches 80%, the three-photon fluorescence intensity is maximum; f illustrates that the maximum three-photon absorption cross section reaches 9.68 x 10 at 1450nm excitation wavelength when the water component reaches 80% as calculated using fluorescence contrast method- 80cm6s2photon-2cm6s2photon-246 times the initial absorption cross section.
5. Cell culture and staining: HepG2 cells and DMEM medium are adopted for 24h culture. Media was removed by three washes with PBS prior to staining. Add 200. mu.L PBS to the petri dish followed by 20. mu. LFD-MnCl2Anhydrous DMSO solution (1X 10)- 3mol/L). After incubation for 15min in the dark, the solution was aspirated by a pipette, washed three times with PBS solution, and subjected to two-photon fluorescence microscopy and imaging.
As can be seen from FIG. 4, FD-MnCl2As a two-photon fluorescent probe, when 800nm is used as excitation wavelength, the probe can penetrate through cell membranes and target HepG2 cell mitochondria, and the co-localization coefficient of the probe reaches 0.85.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
2. a method of preparing a mn (ii) complex having AIE properties and a function of targeting mitochondria in living cells according to claim 1, wherein: n, N-dibutylaniline is used as the initial raw material, and N, N-dibutylaniline and POCl are firstly used3Reacting to obtain compound O, reacting with 2-acetylpyridine to obtain compound FD, and reacting with MnCl2Reacting to obtain complex FD-MnCl2;
The synthetic route is as follows:
3. the method of claim 2 for preparing mn (ii) complexes with AIE properties and function to target living cells mitochondria, wherein: the N, N-dibutylaniline is reacted with DMF and POCl3In a molar ratio of 1:3: 5.
4. The method of claim 2 for preparing mn (ii) complexes with AIE properties and function to target living cells mitochondria, wherein: the molar ratio of the compound O to the 2-acetylpyridine is 1: 2-5.
5. The method of claim 2 for preparing mn (ii) complexes with AIE properties and function to target living cells mitochondria, wherein: the compounds FD and MnCl2The molar ratio of (A) to (B) is 1: 1-3.
6. Use of a mn (ii) complex having AIE properties and a function of targeting living cell mitochondria according to any one of claims 1 to 5 as a multiphoton absorbing material.
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