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Metal-organophosphonates: hydrothermal synthesis and structures of [Cu(O3PC10H6CO2H)] and [Cu(bpy)(HO3PC10H6CO2)] (H2O3PC10H6CO2H = 2,6-carboxynaphthalene phosphonic acid)

Authors
Journal
Inorganica Chimica Acta
0020-1693
Publisher
Elsevier
Publication Date
Volume
363
Issue
8
Identifiers
DOI: 10.1016/j.ica.2010.01.005
Keywords
  • Organic–Inorganic Hybrid Materials
  • Metal-Phosphonate Compounds
  • Two-Dimensional Cu(Ii)-Phosphonate Structure
  • Binuclear Copper(Ii) Building Blocks

Abstract

Abstract Hydrothermal methods were used to prepare [Cu(O 3PC 10H 6CO 2H)] ( 1) and [Cu(bpy)(HO 3PC 10H 6CO 2)]·2H 2O ( 2·2H 2O), where H 2O 3PC 10H 6CO 2H is 2,6-carboxynaphthalene phosphonic acid (H 3cnp). The two-dimensional structure of 1 consists of layers of edge-sharing {CuO 6} octahedra, producing an AlCl 3- type structure of fused hexagonal rings of copper octahedra, enclosing voids of hexagonal profile. The layer composition is CuO 3 or CuO 6/ 2 as each oxygen bridges two copper sites. The Hcnp ligands project from either face of the copper “oxide” layer. Adjacent layers interact through hydrogen bonding interactions between the pendant –CO 2H groups of the ligand. Coordination of the bipyridine ligand in [Cu(HO 3PC 10H 6CO 2)] ( 2) obstructs expansion in two-dimensions, and the material exhibits a chain structure. The chain is constructed of binuclear units of edge-sharing ‘4+1’ {CuO 3N 2} square pyramids linked through the dipodal {HO 3PC 10H 6CO 2} 2− ligands.

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