Synthesis, crystal structure and magnetism of a three-dimensional manganese(II) complex with carbamyldicyanomethanide anion (cda) as a bridging ligand

Abstract

A three-dimensional complex {[Mn(cda) 2 ] AE 2MeOH} n has been synthesized and its crystal structure determined by X-ray crystallography. In the complex each Mn ion is located in a distorted octahedral environment with two oxygen atoms O(1D) and O(1E) from two amide groups, and four nitrogen atoms N(2), N(2A), N(3B) and N(3C) from four nitrile groups of four cda anions, respectively; each cda anion as a l 3 -bridging ligand provides two nitrile nitrogen atoms, and an amide oxygen atoms to coordinate three Mn ions. Thus, a three-dimensional network consisting of Mn ions and cda bridging ligands is constructed with solvent MeOH molecules trapped in the cavities. The variable-temperature magnetic susceptibility of the complex was measured in the 5-300 K range. The magnetic coupling parameter is consistent with an antiferromagnetic exchange and generates the antiferromagnetic coupling parameter, 2J ¼ )0.2 cm )1 .

Destabilisation of a dual-synthon hydrogen bonding motif by packing effects and competing hydrogen bond donors

“…12 Binding through the oxygen atom is observed in bridging coordination modes, with both (N,O) and (N,N 0 ,O) modes known. [24][25][26]…”