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以醋酸锌和3,3’,4,4’-联苯四羧酸(H4BPTC)为原料,采用水热法合成了一个三维超分子化合物[Zn(H2O6)].(C16H8O8)(1)。通过红外光谱、元素分析和X射线单晶衍射对其结构进行了表征,X射线单晶衍射分析结果表明,该超分子化合物属于三斜晶系,PT空间群,晶胞参数a=0.654 8(1)nm,b=0.793 9(2)nm,c=0.968 1(2)nm,α=76.29(3)°,β=87.75(3)°,γ=86.43(3)°,Z=1,R1=0.066 5,wR2=0.183 3,GOF=1.021.并通过荧光光谱研究了1在溶液和固态时的发光性能,在室温DMSO溶液中,当激发波长为316nm时,化合物1在399nm处有一强发射峰,呈现蓝紫色荧光,在室温固态时,该化合物的发射峰发生明显红移,在525nm处有一宽谱带发射峰,呈现绿色荧光,这可以归因于在固态化合物1的分子中存在氢键和π—π堆积的相互作用,可以明显降低分子中基态与激发态之间的能量差距,从而使发射峰红移。
A three - dimensional supramolecular compound [Zn (H2O 6)] (C16H8O8) (1) was synthesized by hydrothermal method using zinc acetate and 3,3 ’, 4,4’ - biphenyltetracarboxylic acid (H4BPTC) as raw materials. Its structure was characterized by IR, elemental analysis and X-ray single crystal diffraction. The X-ray single crystal diffraction analysis showed that the supramolecular compound belongs to triclinic system with PT space group, a = 0.654 8 1 = nm, b = 0.793 9 2 nm, c = 0.968 1 2 nm, α = 76.29 (3) °, β = 87.75 (3) °, γ = 86.43 (3) °, R1 = 0.066 5, wR2 = 0.183 3, GOF = 1.021. The luminescent properties of 1 in solution and in solid state were studied by fluorescence spectroscopy. When the excitation wavelength was 316 nm in DMSO solution at room temperature, compound 1 had a strong at 399 nm The emission peak showed a blue-violet fluorescence. At room temperature, the emission peak of the compound showed a significant red shift with a broad band emission peak at 525 nm, which showed green fluorescence, which could be attributed to the existence of the compound in solid state 1 The interaction between hydrogen bonds and π-π stacking can significantly reduce the energy gap between the ground state and the excited state in the molecule, thereby red-shifting the emission peak.