Synthesis, luminescence, and structural characterization of Zn and Cd coordination polymers of flexible bis(imidazolyl) derivatives

Coordination polymers [Zn(imc)(L-1)] center dot H2O, (1, imc = iminodiacetate, L-1 = bis(N-imidazolyl)methane) [Zn(hba)(2)(L-2)](2) center dot EtOH center dot 3H(2)O, (2, hba = p-hyd roxybenzoate, L-2 = bis(N-benzimidazolyl)methane), [Cd(mal)(H2O)(L-3)](3, L-3 = 1,4-bis(N-imidazolyl)butane, mal = maleate) have been prepared and structurally characterized. Complex 1 consists of hexa-coordinated central Zn ions and exhibits 2D network structure. The Zn atoms in 2 have tetrahedral coordination geometry, and are linked by bis(imidazolyl) ligands into 1D chain structure. The cadmium ions in 3 are hepta-coordinated with pentagonal bipyramidat geometry. Complex 3 displays 2D grid structure. The TGA showed that the coordination polymers are stable up to 200 degrees C. All the three complexes are emissive at room temperature in their solid state. (c) 2007 Elsevier B.V. All rights reserved.