Syntheses, structures and fluorescent properties of three copper cyanide coordination polymers based on N-heterocyclic ligands

Abstract

Hydrothermal reactions of CuCN, K₃[Fe(CN)₆] with 2,2′-bipyridine, 1,10-phenanthroline or 2,6-bis(1,2,4-triazolyl)pyridine (btp) afford three coordination polymers, [Cu₇(CN)₇(bipy)₂] _n (1), [Cu₂(CN)₂(phen)] _n (2) and [Cu₃(CN)₃(btp)] _n (3). Complex 1 displays 1D polymeric ribbons which are assembled through Cu ··· Cu and π–π stacking interactions into a 3D framework. Complex 2 shows a 1D zigzag chain structure in which phen is a side ligand. In 3, the copper cyanide 2D polymeric networks are connected by tridentate btp to form a 3D metal-organic framework. These coordination polymers exhibit strong fluorescent emissions in the solid state.

Keywords:

• Copper(I) cyanide
• N-Heterocyclic ligand
• Coordination polymer
• Crystal structure
• Fluorescence

Acknowledgements

Financially supported by the Research Foundation for Returned Chinese Scholars Overseas of Chinese Education Ministry (7A14219), and the Development Foundation of Shanghai Education Commission (03AK35).