Two cadmium(ii) coordination polymers constructed by carboxylate and pyridine mixed ligands: synthesis, structure and luminescent properties

Abstract

Two new cadmium(II) coordination polymers (CPs), {[Cd(BTG)(bpy)(H₂O)]·0.5glycol·H₂O}_n (1) and {[Cd₆(BTB)₄(bpy)_4.5(glycol)]·9H₂O}_n (2) (H₂BTG = 1,2,3-benzene tricarboxylic acid 2-(2-hydroxy-ethyl) ester, an ester of 1,2,3-benzenetricarboxylic acid and glycol; H₃BTB = 1,2,3-benzenetricarboxylic acid), have been synthesized with the same reactants but different reaction conditions. CP 1 possesses an interesting stair-shaped 2D (4,4) network that stacks in a parallel fashion with a dihedral angle of 80.599(5)°. CP 2 exhibits a complicated 3D structure which can be simplified into a 3,10-connected network with an unreported Schläfli symbol of {3²·4}{3⁴·4²¹·5¹³·6⁷}. The luminescent properties of CPs 1 and 2 are studied.