CN115772182B - Double dysprosium-based single-molecule magnet material and preparation method thereof - Google Patents
Double dysprosium-based single-molecule magnet material and preparation method thereof Download PDFInfo
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- 229910052692 Dysprosium Inorganic materials 0.000 title claims abstract description 55
- KBQHZAAAGSGFKK-UHFFFAOYSA-N dysprosium atom Chemical compound [Dy] KBQHZAAAGSGFKK-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 239000000463 material Substances 0.000 title claims abstract description 53
- 238000002360 preparation method Methods 0.000 title abstract description 7
- DGEZNRSVGBDHLK-UHFFFAOYSA-N [1,10]phenanthroline Chemical compound C1=CN=C2C3=NC=CC=C3C=CC2=C1 DGEZNRSVGBDHLK-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000013078 crystal Substances 0.000 claims abstract description 15
- 150000007857 hydrazones Chemical class 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 5
- NZZIMKJIVMHWJC-UHFFFAOYSA-N dibenzoylmethane Chemical group C=1C=CC=CC=1C(=O)CC(=O)C1=CC=CC=C1 NZZIMKJIVMHWJC-UHFFFAOYSA-N 0.000 claims abstract description 4
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims description 42
- 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 27
- -1 dysprosium dibenzoylmethane salt Chemical compound 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 239000003446 ligand Substances 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 9
- 239000011259 mixed solution Substances 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 8
- 239000000706 filtrate Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 4
- WARCRYXKINZHGQ-UHFFFAOYSA-N benzohydrazide Chemical compound NNC(=O)C1=CC=CC=C1 WARCRYXKINZHGQ-UHFFFAOYSA-N 0.000 claims description 3
- 150000001768 cations Chemical class 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000002091 nanocage Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 230000005291 magnetic effect Effects 0.000 abstract description 19
- 239000000696 magnetic material Substances 0.000 abstract description 7
- 239000011232 storage material Substances 0.000 abstract 1
- 229910001220 stainless steel Inorganic materials 0.000 description 11
- 239000010935 stainless steel Substances 0.000 description 11
- 125000004429 atom Chemical group 0.000 description 7
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 description 5
- 238000004729 solvothermal method Methods 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 238000012937 correction Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 238000002447 crystallographic data Methods 0.000 description 2
- 230000005283 ground state Effects 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 229910021644 lanthanide ion Inorganic materials 0.000 description 2
- 229910052747 lanthanoid Inorganic materials 0.000 description 2
- 150000002602 lanthanoids Chemical class 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000243 solution Substances 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
- 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
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000012046 mixed solvent 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
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000001338 self-assembly Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- Nitrogen Condensed Heterocyclic Rings (AREA)
Abstract
The invention relates to the technical field of magnetic materials, in particular to a double dysprosium-based single-molecule magnetic material and a preparation method thereof. A double dysprosium-based single-molecule magnet material has a chemical formula of [ Dy 2(dbm)2(H2L)2]·6CH3 CN, wherein dbm is dibenzoylmethane, and H 2 L is 2, 9-diphenoyl hydrazone phenanthroline which loses two protons. The double dysprosium-based single-molecule magnet material crystal belongs to a triclinic system, the P-1 space group and the unit cell parameter is a＝12.5956(10)Å,b＝13.0250(7)Å,c＝14.7413(11)Å,α＝69.421(4)°,β＝68.703(5)°,γ＝68.703(5)°,V＝2108.9(3)Å3., and the double dysprosium-based single-molecule magnet material has the characteristics of single-molecule magnet, and the preparation method is simple and convenient, has high purity, good reproducibility and low cost, and can be used for novel magnetic storage materials.
Description
Technical Field
The invention relates to the technical field of magnetic materials, in particular to a double dysprosium-based single-molecule magnetic material and a preparation method thereof.
Background
The Single-molecule magnet (Single-Molecule Magnets, SMMs for short) is a molecular magnetic material with nanometer size in the true sense, and has numerous excellent performances due to the fact that the Single-molecule magnet is an independent nanometer magnetic unit in structure, and has great potential application prospects and values in the fields of super-dense storage, quantum computation and the like, and has become one of the leading-edge research fields of twenty-first-year innovation. Since the first discovery of Single Molecule Magnet (SMMs) behavior in Mn 12 clusters in 1993, numerous academic studies have been conducted in this area, demonstrating: the effective switching energy barrier (Uett) of a single-molecule magnet depends on the spin ground state (S) and the magnetic anisotropy (D), and in order to obtain SMMs with excellent performance, S and D are increased at the same time, while theory D is inversely proportional to S, and large magnetic anisotropy cannot coexist with a high spin ground state. The control of the anisotropy of high nuclear complexes is a more difficult task for the chemist than the control of the spin, and as research goes deep, the lanthanoid element has become an excellent choice for achieving better SMMs, especially Dy (III) in the lanthanide rare earth element, which is the most important element in the rare earth metal constituting a single-molecule magnet due to its large moment and high coordination number, has received extensive attention from a large number of scientific researchers.
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 dibenzoylmethane salts in a mixed solvent of methanol/acetonitrile to form a single molecule magnet.
Disclosure of Invention
The invention aims to provide a double dysprosium-based single-molecule magnet material.
Another object of the present invention is to provide a method for preparing the above-mentioned double dysprosium-based single molecule magnet material.
The technical problems to be solved by the invention are realized by the following technical scheme:
a double dysprosium-based single-molecule magnet material has a chemical formula of [ Dy 2(dbm)2(H2L)2]·6CH3 CN, wherein dbm is dibenzoylmethane, H 2 L is a double acylhydrazone ligand 2, 9-diphthalic acylhydrazone phenanthroline losing two protons, and the structural formula of the 2, 9-diphthalic acylhydrazone phenanthroline is as follows:
the double dysprosium-based single-molecule magnet material crystal belongs to a triclinic system, and the space group P-1 has the unit cell parameters of a＝12.5956(10)Å,b＝13.0250(7)Å,c＝14.7413(11)Å,α＝69.421(4)°,β＝68.703(5)°,γ＝68.703(5)°,V＝2108.9(3)Å3.
Further, 1 metal center Dy 3+ cation (Dy 1), 1H 2L2- anion, 1 dbm − anion, and 3 free acetonitrile solvent molecules are present in the asymmetric structural units of the double dysprosium-based single molecule magnet material. The metal center Dy (III) adopts nine coordination modes to coordinate with 4N atoms (N1, N2, N3, N4) from 1 bisacylhydrazone ligand H 2 L, 3O atoms (O2, O3, O4A) from 2H 2 L and 2O atoms (O8, O9) from 1 dbm ligand to form an N 4O5 coordination environment. The bond length of Dy-N bond is in the range 2.553 (5) -2.666 (4) A and the bond length of Dy-O bond is in the range 2.305 (3) -2.390 (3) A. Adjacent 2 metal centers Dy (III) (Dy 1 and Dy 1A) are bridged by 2 bisacylhydrazone ligands H 2 L to form a windmill-like molecular cage structure, with Dy1 ⋯ Dy1A metal centers being located a distance 6.7900 (7) a.
A preparation method of a double dysprosium-based single-molecule magnet material comprises the following steps: adding 2, 9-di-o-hydroxy benzoyl hydrazone phenanthroline and dysprosium dibenzoylmethane salt 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 double-dysprosium-based single-molecule magnet material.
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 the dysprosium dibenzoylmethane salt is 0.8-1.2:0.8-1.2.
Further, the molar ratio of the 2, 9-di-o-hydroxybenzoyl hydrazone phenanthroline to dysprosium dibenzoylmethane salt is preferably 1:1.
The invention has the beneficial effects that:
The invention firstly uses double dysprosium-based single-molecule magnet materials under solvothermal conditions (figure 3); the double dysprosium-based single-molecule magnet material has better chemical stability (shown in figure 6), and provides a foundation for the double dysprosium-based single-molecule magnet material serving as a potential functional material; the compound has single molecule magnet characteristics (figures 8-12) and can be used for preparing magnetic materials; the preparation method of the double dysprosium-based single-molecule magnet material has the advantages of simple and convenient operation, high purity and good reproducibility.
Drawings
FIG. 1 is a diagram of the coordination environment of a metal center in the crystal structure of a double dysprosium-based single-molecule magnet material according to the invention;
FIG. 2 is a diagram of the coordination environment of bisacylhydrazone ligands in the crystal structure of the double dysprosium-based single-molecule magnet material according to the invention;
FIG. 3 is a molecular structure diagram of a double dysprosium-based single molecule magnet material according to the invention;
FIG. 4 is an infrared spectrum of a double dysprosium-based single molecule magnet material of the invention;
FIG. 5 is an X-ray powder diffraction pattern of a double dysprosium-based single molecule magnet material of the invention;
FIG. 6 is a powder diffraction pattern of a base double dysprosium-base single molecule magnet material of the present invention immersed in various common solvents;
FIG. 7 shows a DC temperature swing susceptibility curve of a double dysprosium-based single molecule magnet material of the invention;
FIG. 8 is a graph of temperature profiles of real parts of different alternating magnetic susceptibility of a double dysprosium-based single molecule magnet material according to the invention;
FIG. 9 is a graph of temperature profiles of imaginary parts of different alternating magnetic susceptibility of a double dysprosium-based single molecule magnet material according to the invention;
FIG. 10 is a graph of the frequency of the real parts of different alternating magnetic susceptibility of a double dysprosium-based single-molecule magnet material according to the invention;
FIG. 11 is a graph of frequency of imaginary parts of different alternating magnetic susceptibility of a double dysprosium-based single-molecule magnet material according to the invention;
Fig. 12 is a graph of relaxation time versus temperature for a double dysprosium-based single molecule magnet material of the present 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-diphoshizoyl hydrazone phenanthroline and 0.1mmol of dysprosium dibenzoylmethane salt Dy (dbm) 3·2H2 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 fully stirred at normal temperature for 60min and then filtered, the filtrate is transferred into a stainless steel reaction kettle with polytetrafluoroethylene lining, the stainless steel reaction kettle is sealed and then put into an oven, solvothermal reaction is carried out for 48h at 70 ℃, then the temperature is reduced to room temperature at 2 ℃/h, the filtration and the washing are carried out, and the yellow blocky crystals of the double dysprosium-based single-molecule magnet material are obtained, wherein the yield is 45.4% (based on Dy).
The structure of the double dysprosium-based single-molecule magnet material crystal prepared in the example is characterized as follows:
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 the crystals of the double dysprosium-based single-molecule magnet material prepared in table 1
A double dysprosium-based single-molecule magnet material has a chemical formula of [ Dy 2(dbm)2(H2L)2]·6CH3 CN, wherein dbm is dibenzoylmethane, and H 2 L is a double acylhydrazone ligand 2, 9-diphenoyl hydrazone phenanthroline losing two protons. The double dysprosium-based single-molecule magnet material crystal belongs to a triclinic system, P-1 space group, 1 metal center Dy 3+ cation (Dy 1), 1H 2L2- anion, 1 dbm − anion and 3 free acetonitrile solvent molecules exist in an asymmetric structural unit of the double dysprosium-based single-molecule magnet material with unit cell parameters of a＝12.5956(10)Å,b＝13.0250(7)Å,c＝14.7413(11)Å,α＝69.421(4)°,β＝68.703(5)°,γ＝68.703(5)°,V＝2108.9(3)Å3.. The metal center Dy (III) adopts a nine-coordination mode to coordinate with 4N atoms from 1 bisacylhydrazone ligand H 2 L, 3O atoms from 2H 2 L and 2O atoms from 1 dbm ligand, so as to form an N 4O5 coordination environment. In the whole molecule, 2 adjacent metal centers Dy (III) are bridged by 2 bisacylhydrazone ligands H 2 L to form a windmill-shaped molecular cage structure, and the distance between the metal centers of two Dy (III) metal centers Dy1 ⋯ Dy1A is 6.7900 (7) a.
The magnetic properties of the double dysprosium-based single-molecule magnet material 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 28.35cm 3 K 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 10.14 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.
The dynamic magnetic behavior of the double dysprosium-based single-molecule magnet material prepared in the example is further studied, the double dysprosium-based single-molecule magnet material is subjected to a sweep alternating-current magnetic susceptibility test in a temperature range of 2-20K ℃ under a zero direct-current field, and is subjected to a sweep alternating-current magnetic susceptibility test in a temperature range of 2-12K, and the real part and the imaginary part of the double dysprosium-based single-molecule alternating-current magnetic susceptibility curve show temperature dependence and frequency dependence (shown in fig. 8-11) from the experimental results, so that slow magnetic relaxation behavior is generated, and the double dysprosium-based single-molecule magnet material is proved to have single-molecule magnet characteristics. 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, so that the potential energy barrier of the double dysprosium-based single-molecule magnet is U eff/kB =62.52K, and the pre-finger factor is tau 0 = 4.83 × 10−7 s; the pre-finger factor is in the normal range of single molecule magnets (10 −6 −10−12 s).
In conclusion, the double dysprosium-based single-molecule magnet material prepared by the invention presents obvious temperature dependence and frequency dependence phenomena under zero field, generates typical slow relaxation behavior, has single-molecule magnet characteristics, can be used as a molecule-based magnetic material, and is applied to novel high-density information storage equipment.
Example 2:
Dissolving 0.09mmol of 2, 9-diphoshizoyl hydrazone phenanthroline and 0.1mmol of dysprosium dibenzoylmethane salt Dy (dbm) 3·2H2 O in a mixed solution of 20mL of methanol and acetonitrile (V: V=1:1), dropwise adding 0.09mL of triethylamine, fully stirring at normal temperature for 60min, filtering, transferring the filtrate into a stainless steel reaction kettle with polytetrafluoroethylene lining, sealing the stainless steel reaction kettle, putting the stainless steel reaction kettle into an oven, carrying out solvothermal reaction at 80 ℃ for 72h, cooling to room temperature at 2 ℃/h, filtering, and washing to obtain yellow blocky crystals of the double dysprosium-based single-molecule magnet material, wherein the yield is 40.9% (based on Dy).
Example 3:
0.11mmol of 2, 9-dihydroxybenzoyl hydrazone phenanthroline and 0.1mmol of dysprosium dibenzoylmethane salt Dy (dbm) 3·2H2 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 fully stirred at normal temperature for 60min and then filtered, the filtrate is transferred into a stainless steel reaction kettle with polytetrafluoroethylene lining, the stainless steel reaction kettle is sealed and then put into an oven, solvothermal reaction is carried out for 96h at 70 ℃, then the temperature is reduced to room temperature at 10 ℃/h, the filtration and the washing are carried out, and the yellow blocky crystals of the double dysprosium-based single-molecule magnet material are obtained, wherein the yield is 45.7% (based on Dy).
Example 4:
0.1mmol of 2, 9-diphoshizoyl hydrazone phenanthroline and 0.12mmol of dysprosium dibenzoylmethane salt Dy (dbm) 3·2H2 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 fully stirred at normal temperature for 60min and then filtered, the filtrate is transferred into a stainless steel reaction kettle with polytetrafluoroethylene lining, the stainless steel reaction kettle is sealed and then placed into an oven, solvothermal reaction is carried out for 72h at 80 ℃, then the temperature is reduced to room temperature at 10 ℃/h, the filtration and the washing are carried out, and the yellow blocky crystals of the double dysprosium-based single-molecule magnet material are obtained, wherein the yield is 38.6% (based on Dy).
Example 5:
0.1mmol of 2, 9-diphoshizoyl hydrazone phenanthroline and 0.1mmol of dysprosium dibenzoylmethane salt Dy (dbm) 3·2H2 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 fully stirred at normal temperature for 60min and then filtered, the filtrate is transferred into a stainless steel reaction kettle with polytetrafluoroethylene lining, the stainless steel reaction kettle is sealed and then placed into an oven, solvothermal reaction is carried out for 48h at 60 ℃, then the temperature is reduced to room temperature at 5 ℃/h, the filtration and the washing are carried out, and the yellow blocky crystal of the double dysprosium-based single-molecule magnet material is obtained, wherein the yield is 43.6% (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 double dysprosium-based single-molecule magnet material with a chemical formula of [ Dy 2(dbm)2(H2L)2]·6CH3 CN, wherein dbm is dibenzoylmethane, H 2 L is bisacylhydrazone ligand 2, 9-diphoshizoyl hydrazone phenanthroline losing two protons, and the double dysprosium-based single-molecule magnet material crystal belongs to a triclinic system, P-1 space group, and unit cell parameters are that α＝69.421(4)°，β＝68.703(5)°，γ＝83.813(4)°， 1 Metal center Dy 3+ cation Dy1, 1H 2L2- anion, 1 dbm - anion and 3 free acetonitrile solvent molecules exist in an asymmetric structural unit of the double dysprosium-based single-molecule magnet material; the metal center Dy (III) adopts a nine-coordination mode to coordinate with 4N atoms from 1 bisacylhydrazone ligand H 2 L, 3O atoms from 2H 2 L and 2O atoms of 1 dbm ligand to form an N 4O5 coordination environment; in the whole molecule, 2 adjacent metal centers Dy (III) are bridged by 2 bisacylhydrazone ligands H 2 L to form a windmill-shaped molecular cage structure, and the distance between the metal centers of Dy1 … Dy1A in the metal centers of two Dy (III) is
2. The method for preparing the double dysprosium-based single molecule magnet material according to claim 1, comprising the following steps: adding 2, 9-di-o-hydroxy benzoyl hydrazone phenanthroline and dysprosium dibenzoylmethane salt 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 double-dysprosium-based single-molecule magnet material.
3. The method for preparing a double dysprosium-based single-molecule magnet material according to claim 2, wherein the molar ratio of the 2, 9-diphthalic acylhydrazone phenanthroline to the dysprosium dibenzoylmethane salt is 0.8-1.2:0.8-1.2.
4. The method for preparing a double dysprosium-based single-molecule magnet material according to claim 2, wherein the molar ratio of the 2, 9-diphthalic acylhydrazone phenanthroline to the dysprosium dibenzoylmethane salt is 1:1.
5. The method for preparing the double dysprosium-based single-molecule magnet material according to claim 2, wherein the volume ratio of methanol to acetonitrile in the mixed solution of methanol and acetonitrile is 1:1.
6. The method for preparing the double dysprosium-based single-molecule magnet material according to claim 2, wherein the volume ratio of the mole number of the 2, 9-diphthalic acylhydrazone phenanthroline to triethylamine is 1 mmol/1 mL.
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