| Photothermal conversion materials with brond absorption and high conversion efficiency have been attracted great interest in recent years.Functional coordination compounds are complicated molecules that coordination organic functional ligands with specific performance metal centres.They are ideal molecules for the development of photothermal conversion materials due to their wide varieties and atomic precisely structures.The cheap divalent copper ion Cu2+with unique electron configuration 3d9 is promising metal centre for developing photothermal conversion functional materials.Cu(?)coordination compounds usually have broad light absorption to the near-infrared region,and can reduce the energy dissipation process via light emitting.Introducing some organic ligands with polycyclic aromatic hydrocarbon groups into the divalent copper centres will improve their spectral absorption and light capture capacity through the antenna effect.Based on this,high-efficiency photothermal conversion functional coordination compounds can be constructed.Naphthyl derivatives as typical condensed ring hydrocarbon derivatives,like 1-naphthalacetic acid(1-NTAA)and 2-naphthalic acid(2-NTA),are ideal ligands for constructing photothermal functional coordination compounds due to abundant sources,low price and molecular stability a.In this thesis,we choose the photothermal conversion properties of the copper(?)coordination compounds as main object of study,design and prepare photothermal conversion materials with atomic precisely structures and superior performances by self-assembling naphthalyl derivatives with copper salts.The main research contents are as follows:1)Three photothermal functional coordination compounds were constructed by reacting copper salts with 1-NTAA or 2-NTA under the synergistic action of 2,2'-bipyridine(bpy)/imidazole(im)or other auxiliary ligands via solvothermal method.X-ray single crystal diffraction analysis(SXRD)reveal their formulas are {[(bpy)4Cu4(1-NTAA)5](BF4)3(CH3OH)· H2O}?(1),{[Cu2(1-NTAA)4(CH3CN)2]· 2(CH3CN)}(2),{[Cu2(2-NTA)4(CH3CN)2)· 2.5(CH3CN)}(3),respectively.Among them,complex 1 is a coordination polymer with one-dimensional chain structure,whereas complex 2 and 3 are two dinuclear copper(?)complexes with similar impeller structure.Their structures were further characterized by infrared spectroscopy,ultraviolet spectrum and X-ray powder diffraction(PXRD).Their structures had been atomic precisely characterized,which laid a good foundation for further studing on their structure-function relationships.2)Their thermal stabilities and light absorption performances were characterized by thermal analysis(TGA)and Solid-state UV.Thermal analysis studies show that the initial thermal decomposition temperature for complex 1 is as high as 248?,which is related to the existence of large numbers of intramolecular stacking interactions and the auxiliary functions of bpy ligands.Solid-state UV showed that the main absorption bands of the three complexes were in the ultraviolet region(<400 nm)and the near-infrared region(?680 nm),with energy gaps of 2.58 eV,2.54 eV and 2.67 eV,respectively.Those results show that the introduction of naphth molecular groups into copper(?)center achieve wide light absorption in almost full spectral range.Complex 1 is an ideal molecule for developing photothermal conversion materials due to its excellent thermal stability and light absorption properties.3)Photothermal conversion experiments were performed for evaluating their photothermal conversion properties.The results show complex 1 has the fastest heating rate(close to 2?/min at the beginning),the largest temperature increment(12?)and the highest photothermal equilibrium temperature(40?).These results give new direction for the molecular design to improve the performance of photothermal conversion materials and provide the experimental basis for the application of functional coordination compounds in the field of photothermal conversion. |
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