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Coordination polymers; meso-substituted dipyrrins; heteroleptic; acetylacetonato; hexafluoroacetylacetonato; copper complexes.

The syntheses and characterizations of meso-substituted dipyrrins, 5-(4-imidazol-1-yl-phenyl)-dipyrromethene (4-impdpm), 5-(4-nitro-imidazol-1-yl-phenyl)-dipyrromethene, (4-nimpdpm), 5-(4-benzimidazol-1-yl-phenyl)-dipyrromethene (4-bimp-dpm) and heteroleptic complexes [Cu₃(4-impdpm)₂(hfacac)₄] 1, [Cu(4-nimpdpm)(acac)] 2, [Cu(4-nimpdpm)(hfacac)] 3, [{Cu(4-bimpdpm)(acac)}$_n$] 4 and [{Cu(4-bimpdpm)-(hfacac)}$_n$] 5, imparting acetylacetonato (acac) and hexafluoroacetylacetonato (hfacac) groups as co-ligand have been described. The dipyrrins and complexes 1-5 have been characterized by elemental analyses and spectral (IR ESI-MS, NMR, electronic absorption and emission) studies. Crystal structures of 1, 3 and 4 have been authenticated by X-ray single crystal analyses. The reaction between 4-impdpm and Cu(hfacac)₂ gave a trimetallic complex, under analogous conditions 4-nimpdpm and 4-bimpdpm reacted with Cu(acac)₂ and Cu(hfacac)₂·2H₂O to afford mononuclear (2, 3) and 1D polymeric (4, 5) complexes.

Rakesh Kumar Gupta¹ Mahendra Yadav¹ Rampal Pandey¹ Daya Shankar Pandey¹

1. Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi 221005, India

Published

November 2011

• 6ESI_Revised