Syntheses, Crystal Structures, and Fluorescence Properties of Two Transition Metal‐Organic Coordination Polymers Based on 4,4′‐Dimethyl‐2,2′‐bipyridine

Abstract

Abstract Two transition metal‐organic coordination polymers, [Mn 2 (1,3‐bdc) 2 (Me 2 bpy) 2 ] · Me 2 bpy ( 1 ) and [Co(4,4′‐oba)(Me 2 bpy)] ( 2 ) were hydrothermally synthesized and structurally characterized by elemental analysis, IR spectroscopy, TG, and single‐crystal X‐ray diffraction [1,3‐H 2 bdc = benzene‐1,3‐dicarboxylic acid, H 2 oba = 4,4′‐oxybis(benzoic acid) Me 2 bpy = 4,4′‐dimethyl‐2,2′‐bipyridine]. Compound 1 crystallizes in the orthorhombic system, space group P 2 1 2 1 2 1 , with a = 23.371(5), b = 14.419(3), and c = 14.251(3) Å. Compound 2 crystallizes in the monoclinic system, space group P 2 1 / c , with a = 7.4863(15), b = 18.272(4), c = 16.953(5) Å, and β = 107.44(3)°. The crystal structure of complex 1 is a wave‐like layer with central Mn 2+ atoms bridged by 1,3‐bdc ligands, whereas the structure of compound 2 presents a ladder chain of hexacoordinate Co 2+ atoms, in which the metal atoms are bridged by 4,4′‐oba ligands and decorated by Me 2 bpy ligands. The two compounds are further extended into 3D supramolecular structures through π–π stacking interactions. Additionally, the compounds show intense fluorescence in solid state at room temperature.