Synthesis and luminescent properties of novel polymeric metal complexes with bis(1,10-phenanthroline) group

The polymeric metal complexes of 1,4-bis([1,10]phenanthroline-[5,6-d]imidazol-2-yl)benzene (BPIB) with copper(II) and zinc(II) were synthesized and characterized by FT-IR, elemental analysis, conductivity measurements and gel permeation chromatography. The stoichiometry of the polymeric metal complexes was [(C32H18N8)7(MCl2)8] (M = Cu(II), Zn(II)); BPIB forms a five-membered chelate ring. UV–vis and fluorescence spectra at room temperature revealed that the maximal emission of the complexes is red shifted as a result of coordination with the metal ions. Both complexes have good thermal stability and emit blue/green luminescence at 526 and 517 nm in the solid state and purple/blue luminescence at 423 and 434 nm in DMSO.