Crystal structure and spectroscopic analysis of a new oxalate-bridged MnII compound: Catena-poly[guanidinium [[aquachloridomanganese(II)]-μ2-oxalato-κ4 O 1,O 2:O 1′,O 2′] monohydrate]

Abstract

As part of our studies on the synthesis and the characterization of oxalate-bridged compounds M-ox-M (ox = oxalate dianion and M = transition metal ion), we report the crystal structure of a new oxalate-bridged MnII phase, {(CH6N3)[Mn(C2O4)Cl(H2O)] H2O} n. In the compound, a succession of MnII ions (situated on inversion centers) adopting a distorted octahedral coordination and bridged by oxalate ligands forms parallel zigzag chains running along the c axis. These chains are interconnected through O - H⋯O hydrogen-bonding interactions to form anionic layers parallel to (010). Individual layers are held together via strong hydrogen bonds involving the guanidinium cations (N - H⋯O and N - H⋯Cl) and the disordered non-coordinating water molecule (O - H⋯O and O - H⋯Cl), as well as by guanidinium π-π stacking. The structural data were confirmed by IR and UV-Visible spectroscopic analysis.