Two new luminescence cadmium coordination polymers constructed by 4,4′-di(4 H -1,2,4-triazol-4-yl)-1,1′-biphenyl and polycarboxylic acids: syntheses, structures, Fe 3+ identifying and photo-degradable properties

Two new Cd centered coordination polymers (CPs), namely, [Cd 3 (L) 1.5 (1,2,4-btc)(H 2 O) 4 ]·H 2 O (1) and [Cd 4 (L) 2 (1,2,4,5-betc)(H 2 O)]·H 2 O (2) have been synthesized by the reaction of 4,4′-di(4 H -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-H 3 btc (1,2,4-benzenetricarboxylic acid) as secondary ligand is a 3D framework with (3,4,5)-connected net topology and the point symbol of {4·5 2 ·6·7·8}{4·5 2 ·6 2 ·7 3 ·8 2 }{5·6·7}, while 2 with 1,2,4,5-H 4 betc (1,2,4,5-benzenetetracarboxylic acid) as secondary ligand displays a (4,6)-connected {4 4 ·6 2 }{4 8 ·6 7 } topological structure. Both CPs 1 and 2 exhibit luminescence properties and the luminescence could be influenced by certain metal cations. The Fe 3+ identifying and photo-degradable properties of 1 and 2 were studied.