New Types of Layered and Pillared Layered Metal

Carboxylate-Phosphonates Based on the 4,4ʹ-Bipyridine Ligand Hydrothermal reactions of transition metal salts with HO2CCH2N(CH2PO3H2)2 (H5L) and 4,4ʹ-bipyridine (bipy) lead to two new metal carboxylate-diphosphonates, namely, Co3(H2L)2(H2O)4(bipy)2·11H2O (1) with a layered structure, and a blue luminescent compound, Zn5L2(bipy)2·9H2O (2) with a pillared layered structure. In compound 1, three Co(II) ions are interconnected by two chelating and bridging phosphonate ligands to form a trinuclear unit, and such units are further cross-linked via bridging bipy ligands to form a 2D layer. In compound 2, the zinc (II) ions in the trigonal bipyramidal or tetrahedral geometries are interconnected via chelating and bridging carboxylate-phosphonate ligands into 2D layers which are further cross-linked by 4,4ʹ-bipy ligands into a pillared layered architecture. Results of luminescent studies indicate that compound 2 is a blue light luminescent material.