Synthesis, Structure and Photoluminescence of a New Cadmium(II) Complex Involving in situ Decarboxylation

A new luminescent dinuclear cluster complex [Cd-2(PZC)(2)(AmTAZ)(H2O)(4)(NO3)]center dot NO3 (Hpzc = pyrazine-2-carboxylic acid, AmTAZ = 3-amino-4H-1,2,4-triazole) has been prepared by the assembly of Cd-II with pyrazine-2,3-dicarboxylic acid and 3-amino-1H-1,2,4-triazole-5-carboxylic acid ligands under hydrothermal conditions, in which in situ decarboxylation of H(2)pzdc and HAmTZC ligands simultaneously occurred, and H2pzdc was transformed into Hpzc while HAmTZC into AmTAZ. The crystal structure is of triclinic, space group P (1) over bar with a = 7.096(2), b = 11.140(4), c = 14.887(5) angstrom, alpha = 92.641(4), beta = 91.348(6), gamma = 96.058(6)degrees, V = 1168.5(7) angstrom(3), C12H18Cd2N10O14, M-r = 751.16, Z = 2, D-c = 2.126 g/cm(3), F(000) = 730, mu = 1.910 mm(-1), R = 0.0320 and wR = 0.0998 for 4549 observed reflections (I > 2 sigma(I)). The dinuclear cluster of 1 is extended into a 3D supramolecular architecture through intermolecular hydrogen bonding interactions. Complex 1 exhibits strong blue photoluminescence at room temperature.