基于4,4′-联吡啶配体金属锌配合物的制备及性能研究

Preparation and Properties of Zinc Complexes Based on 4,4'-Bipyridine Ligands

采用溶剂热合成法制得[Zn(ipa)(4,4′-bipy)·H_(2)O]_(n)(1).实验以六水合硝酸锌Zn(NO_(3))_(2)·6H_(2)O、间苯二甲酸(H_(2)ipa)、DMF(N,N′-二甲基甲酰胺)、4,4′-联吡啶(4,4′-bpy)为原料(ipa^(2-)=间苯二甲酸根,bipy=联吡啶),在溶剂热条件下合成金属锌配合物1.采用单晶X-射线衍射法、荧光光谱分析法(FL)、粉末X射线衍射(PX R D)、红外光谱法(FT-IR)和热重分析法(T GA)对其结构测定和表征.在配合物1中,Zn(Ⅱ)与4,4′-联吡啶的N原子和ipa^(2-)阴离子的羧基O原子形成六配位的扭曲的八面体结构,进一步扩展形成具有孔道的三维Zn(Ⅱ)金属有机框架(MOF),H_(2)O分子在孔道中.室温下荧光光谱分析表明,当激发波长为365nm时,配合物1在458.6nm处具有最强的发射峰.

[Zn(ipa)(4,4'-bipy)·H_(2)O]_(n)(1)was prepared by solvothermal synthesis.Zinc complex 1 was synthesized from zinc nitrate hexahydrate Zn(NO_(3))_(2)·6H_(2)O,isophthalic acid(H_(2)ipa),DMF(N,N'-dimethylformamide)and 4,4'-bipyridine(4,4'-bpy)under solvothermal conditions.Their structures were characterized by single crystal X-ray diffraction,Fluorescence spectroscopy(FL),Powder X-ray diffraction(PXRD),infrared spectroscopy(FT-IR)and thermogravimetric analysis(TGA).In complex 1,Zn(No_(3))_(2) forms a six-coordinated twisted octahedral structure with the N atom of 4,4'-bipyridine and the carboxyl O atom of ipa^(2-)anion,which further expands to form a three-dimensional Zn(Ⅱ)metal-organic framework(MOF)with pores in which H_(2)O molecules are present.The fluorescence spectra at room temperature show that the complex 1 has the strongest emission peak at 458.6 nm when the excitation wavelength is 365 nm.