Poly[aqua(μ₂-benzene-1,4-dicarboxylato)(μ₂-4,4′-bipyridineN,N′-dioxide)cadmium(II)], a threefold interpenetrating diamond net

Abstract

In the title compound, [Cd(C(8)H(4)O(4))(C(10)H(8)N(2)O(2))(H(2)O)](n), (I), each Cd(II) atom is seven-coordinated in a distorted monocapped trigonal prismatic coordination geometry, surrounded by four carboxylate O atoms from two different benzene-1,4-dicarboxylate (1,4-bdc) anions, two O atoms from two distinct 4,4'-bipyridine N,N'-dioxide (bpdo) ligands and one water O atom. The Cd(II) atom and the water O atom are on a twofold rotation axis. The bpdo and 1,4-bdc ligands are on centers of inversion. Each crystallographically unique Cd(II) center is bridged by the 1,4-bdc dianions and bpdo ligands to give a three-dimensional diamond framework containing large adamantanoid cages. Three identical such nets are interlocked with each other, thus directly leading to the formation of a threefold interpenetrated three-dimensional diamond architecture. To the best of our knowledge, (I) is the first example of a threefold interpenetrating diamond net based on both bpdo and carboxylate ligands. There are strong linear O-H...O hydrogen bonds between the water molecules and carboxylate O atoms within different diamond nets. Each diamond net is hydrogen bonded to its two neighbors through these hydrogen bonds, which further consolidates the threefold interpenetrating diamond framework.

Unusual Very Strong O–H···O Hydrogen Bonding in Zinc Complex: Crystal Structure and Photoluminescence of [Zn(HL)(bpy)2(H2O)]2(L) (L = O2C(CF2)6CO2, bpy = 2,2′bipyridine)

“…To date, numerous examples of metal-organic frameworks have been constructed via covalent interactions [4,5]. Aside from covalent interactions, hydrogen-bonding contacts are also used to construct interesting coordination polymers [6,7]. Hydrogen bonding is an interesting topic that receives much attention, in terms of aggregation of molecules to advance some physical properties of supramolecular structures.…”