title: Speciation of metal phosphonates with the assistance of weak interactions.
abstract: By employing an aromatic methyl substituted V-shaped diphosphonic acid as a ligand, a series of metal diphosphonates, namely [Cu3(HL)2(H2O)2][(H2O)2] (1), [Cu(H2L)(pyz)(H2O)2][(H2O)2] (2), [Cu(H2L)(2,2'-bipy)] (3), [Cu(H2L)(4,4'-bipy)(H2O)2] (4), [Zn(H2L)(2,2'-bipy)] (5) and [Cd(H2L)(2,2'-bipy)(H2O)][(H2O)6] (6), have been synthesized. The structural studies reveal that these compounds exhibit diverse crystal structures. The introduction of the methyl group and pyridine derived auxiliary ligands results in the formation of plenty of C-HO, C-Hπ and ππ interactions, which contribute to the crystallization of metal diphosphonates. It was found that the Zn and Cd containing compounds showed intense intraligand emissions.
authors.affiliation: College of Life Science, Qingdao Agriculture University, Changcheng Road 700, Chengyang District, Qingdao 266109, China.
authors.forename: Xiaomin
authors.initials: X
authors.lastname: Hou
authors.forename: Si-Fu
authors.initials: SF
authors.lastname: Tang