Synthesis, structures, and luminescence properties of mixed ligand Cd(II) and Zn(II) coordination compounds mediated by 1,2-bis(4-pyridyl)ethane

Interaction of cadmium(II) or zinc(II) acetate with 1,2-bis(4-pyridyl)ethane (bpe) in the presence of dioxime(1,2-cyclohexanedionedioxime = NioxH2 or diphenylglyoxime = dpgH2) resulted in three complexes with the compositions [Cd2(CH3COO)4(NioxH2)2(bpe)(H2O)2] (1), [Cd(CH3COO)2(bpe)(H2O)]n (2) and [Zn(CH3COO)2(NioxH2)(bpe)(H2O)]n (3), which were characterized by single-crystal X-ray diffraction, elemental analysis, IR, and luminescence spectroscopy. Dioxime-containing binuclear molecule 1 and 1D linear polymer 3 possess moderate luminescence properties, while the dioxime-free 1D polymer 2 demonstrates strong blue luminescence.

Graphical abstractInteraction of cadmium(II) or zinc(II) acetate with 1,2-bis(4-pyridyl)ethane (bpe) in the presence of dioxime(1,2-cyclohexanedionedioxime = NioxH2 or diphenylglyoxime = dpgH2) resulted in three complexes with the compositions [Cd2(CH3COO)4(NioxH2)2(bpe)(H2O)2] (1), [Cd(CH3COO)2(bpe)(H2O)]n (2), and [Zn(CH3COO)2(NioxH2)(bpe)(H2O)]n (3), which have been characterized by single-crystal X-ray diffraction, elemental analysis, IR, and luminescence spectroscopy. Dioxime-containing binuclear molecule 1, and 1D linear polymer 3 possess the moderate luminescence properties, while the dioxime-free 1D polymer 2 demonstrates strong blue luminescence. All compounds may be potential candidates for blue luminescent materials.Figure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► Cadmium and zinc coordination compounds with acetate and flexible bipyridine ligand. ► Synthesis and X-ray study. ► The solvent-accessible voids were estimated using PLATON. ► All materials undergo blue luminescence.