Synthesis, characterization and crystal structure of a new linear trinuclear manganese(II) complex, [Mn3(PhCH=CHCO2)6(BPY)2] · H2O (BPY=2,2-bipyridine)

Abstract

A new trinuclear manganese(II) complex, [Mn3(PhCH=CHCO2)6(bpy)2] · H2O (1) (bpy = 2,2-bipyridine), was synthesized by the reaction of Mn(OH)2 with cinnamate in H2O/methanolic solution and its solid state structure was determined by single crystal X-ray diffraction. Structural analyses suggest that 1 consists of a linear arrangement of three Mn(II) centers, bridged by six cinnamate carboxylate groups. Four of these carboxylates are syn–syn bidentate, and two are monodentate bridging plus bidentate chelating. Mn(2) on a crystallographic inversion center has a slightly disorted octahedral geometry; the terminal six-coordinate Mn(1) atoms are significantly distorted octahedra. Weak intermolecular interactions such as C–H ··· O hydrogen-bonding and π–π stacking are responsible for supramolecular assembly of the molecules. Compound 1 was characterized by infrared spectrum, thermogravimetric and X-ray powder diffraction analyses.