Synthesis, Structures, and Properties of Two Zinc(II) and Cadmium(II) Supramolecular Complexes Based on Diphenic Acid

Abstract

Two novel binuclear metal-organic coordination complexes [Zn2(dpa)2(phen)2(H2O)2] (1), [Cd2(dpa)2(btz)2(H2O)2] (2) (where H2dpa = diphenic acid, phen = 1,10-phenanthroline, btz = thiabendazole) have been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction, spectral method (IR), elemental analysis, and fluorescent properties. Compound 1 crystallizes in the triclinic P-1 space group while compound 2 in the monoclinic system with space group P2(1)/n. The binuclear cluster are stabilized by O‒HO hydrogen bond and further fitted together into 3-D supramolecular network by π–π stacking interactions and hydrogen bonds. The luminescence measurements reveal that two complexes exhibit strong fluorescent emissions in the solid state at room temperature.