Cadmium(II) Complexes with Mixed cis‐Epoxysuccinate and 2,2′‐Bipyridyl‐Like Ligands: Syntheses, Crystal Structures, and Luminescent Properties

Abstract

Abstract Two new Cd II complexes, [Cd( ces )(phen)] ∞ ( 1 ) and {[Cd( ces )(bpy)(H 2 O)](H 2 O)} 2 ( 2 ), were prepared by slow solvent evaporation methods from mixtures of cis ‐epoxysuccinic acid and Cd(ClO 4 ) 2 · 6H 2 O in the presence of phen or bpy co‐ligand ( ces = cis ‐epoxysuccinate, phen = 1,10‐phenanthroline, and bpy = 2,2′‐bipyridine). Single‐crystal X‐ray diffraction analyses show that complex 1 has a one‐dimensional (1D) helical chain that is further assembled into a two‐dimensional (2D) sheet, and then an overall three‐dimensional (3D) network by the interchain C–H ··· O hydrogen bonds. Complex 2 features a dinuclear structure, which is further interlinked into a 3D supramolecular network by the co‐effects of intermolecular C–H ··· O and C–H ··· π hydrogen bonds as well as π ··· π stacking interactions. The structural differences between 1 and 2 are attributable to the intervention of different 2,2′‐bipyridyl‐like co‐ligands. Moreover, 1 and 2 exhibit intense solid‐state luminescence at room temperature, which mainly originates from the intraligand π→π* transitions of aromatic co‐ligands.