Two new 3D (3,8)-connected metal-organic frameworks based on zinc-triazole secondary building units and benzenetricarboxylate linkers

摘要

Two new zinc-triazole-carboxylate frameworks constructed from secondary building units (SBUs), [Zn_5(trz)_4(btc)_2(DMF) _2(H_2O)_2]·2H_2O·DMF (1) and [Zn_4(trz)_3(btc)_2(CH3CN)(H _2O)]·5H_2O·(Bu_4N) (2), [Htrz = 1,2,4-triazole, H_3btc = 1,2,4-benzenetricarboxylate, Bu_4N = tetrabutylammonium], have been synthesized by solvothermal reactions and characterized by single-crystal X-ray diffraction analyses, X-ray power diffraction, elemental analyses, infrared spectra and thermogravimetric analyses. Both compounds 1 and 2 exhibit 3D (3,8)-connected tfz-d nets with {4~3}_2{46.~6~(18).8~4} topology symbol built from rod-shaped {[Zn_5(trz)_4] ~(6+)}_n SBUs (1) and {[Zn_4(trz)_3] ~(5+)}_n SBUs (2). In two compounds, rodlike units are connected by btc ligands via different modes. Additionally, solid state fluorescent emission spectra of two compounds show fluorescent properties at room temperature.