Syntheses, characterization and fluorescent properties of two square pyramidal Cu (II) inorganic–organic hybrid polymers

Two copper(II) carboxylate polymers of formula [Cu2(OOCCH3)4(4,40-bpy)]$DMF 1 and [Cu(OOCCH2COO)(DMF)] 2 (DMFZN,Ndimethylformamide) have been synthesized in mixed DMF–CH3OH–H2O solution and characterized by X-ray diffraction, FT-IR, UV–vis, EPR, XPS and fluorescence. The structure of 1 consists of a two-dimensional supramolecular layer constructed by intermolecular p–p interactions of the bipyridine rings from adjacent one-dimensional [Cu2(OOCCH3)4(4,40-bpy)] chains. The space between the two neighboring layers is filled by the solvent DMF molecules and thus a sandwich-like supramolecular structure was formed. Polymer 2 contains a three-dimensional chiral framework constructed only by malonate ligand with syn–anti and anti–anti coordination modes. The fluorescent properties of 1 and 2 have been measured showing strong fluorescent emissions at room temperature. q 2005 Elsevier B.V. All rights reserved