A three-dimensional coordination polymer based on 1,2,3-triazole-4,5-dicarboxylic acid (H3tda): {[Cd12(tda)8(H2O)11] · (H2O)6.25}n

The title coordination polymer {[Cd12(tda)8(H2O)11] · (H2O)6.25}n (H3tda = 1,2,3-triazole-4,5-dicarboxylic acid), has been hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction. Complex crystallizes in orthorhombic sp. gr. Pmn21 with Z = 4. The Cd2 unit doublebridged by one carboxylate oxygen atom and two neighboring nitrogen atoms from the tda3– ligands are linked by the tda3–ligands to lead to the 2D (4,4) network in the ac plane. The almost coplanar Cd2(μ5-tda)2 unit comprised of two Cd ions double-bridged by two tda3– ligands through the neighboring nitrogen atoms is connected with the other four Cd2(μ5-tda)2 units form the undulating 2D network in the ac plane. The (4,4) networks and undulating 2D networks are alternatively connected along the b axis by the tda3– ligands coordinating to the Cd ions to form the 3D framework.