Crystal structure and spectroscopic analysis of a new oxalate-bridged Mn(II) compound: catena-poly[guanidinium [[aqua­chlorido­manganese(II)]-μ(2)-oxalato-κ(4) O (1),O (2):O (1′),O (2′)] monohydrate]

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 Mn(II) phase, {(CH(6)N(3))[Mn(C(2)O(4))Cl(H(2)O)]·H(2)O}(n). In the compound, a succession of Mn(II) 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.