Two new luminescence cadmium coordination polymers constructed by 4,4′-di(4H-1,2,4-triazol-4-yl)-1,1′-biphenyl and polycarboxylic acids: syntheses, structures, Fe3+ identifying and photo-degradable properties

Abstract

Two new Cd centered coordination polymers (CPs), namely, [Cd₃(L)_1.5(1,2,4-btc)(H₂O)₄]·H₂O (1) and [Cd₄(L)₂(1,2,4,5-betc)(H₂O)]·H₂O (2) have been synthesized by the reaction of 4,4′-di(4H-1,2,4-triazol-4-yl)-1,1′-biphenyl (L), polycarboxylic acids and cadmium nitrate under solvothermal conditions. Their structures were first detected by single crystal X-ray diffraction and further characterized by elemental analysis, IR, TGA and X-ray single crystal/powder diffraction. CP 1 with 1,2,4-H₃btc (1,2,4-benzenetricarboxylic acid) as secondary ligand is a 3D framework with (3,4,5)-connected net topology and the point symbol of {4·5²·6·7·8}{4·5²·6²·7³·8²}{5·6·7}, while 2 with 1,2,4,5-H₄betc (1,2,4,5-benzenetetracarboxylic acid) as secondary ligand displays a (4,6)-connected {4⁴·6²}{4⁸·6⁷} topological structure. Both CPs 1 and 2 exhibit luminescence properties and the luminescence could be influenced by certain metal cations. The Fe³⁺ identifying and photo-degradable properties of 1 and 2 were studied.