The crystal structure and spectroscopic properties of catena-(2- methylimidazolium bis(μ2-chloro)aquachloromanganese(II))

Abstract

A novel manganese(II) coordination polymer, catena-(2-methylimidazolium bis(μ2-chloro)aquachloromanganese(II)), {(C4H 7N2)[MnCl3(H2O)]}n, was synthesized, structurally characterized by FTIR spectroscopy and confirmed by single crystal X-ray diffraction analysis. Thermogravimetric analysis and EPR spectroscopy of the compound were also performed. The colourless crystals of the complex were monoclinic, space group P21/c, with the cell parameters a = 11.298(2) Å, b = 7.2485(14) Å, c = 14.709(5) Å, β = 128.861(18)°, V = 938.0(5) Å3, Z = 4 and R1 = 0.03. The title compound consisted of one-dimensional infinite anionic chains [MnCl3(H2O)]n and isolated 2-methylimidazolium cations. The Mn(II) atom was octahedrally coordinated to four bridging chloride anions (Mn-Cl = 2.5109(6) - 2.5688(7) Å one terminal chloride anion (Mn-Cl = 2.5068(11) Å) and a H2O molecule (Mn-O = 2.2351(17) Å). A three-dimensional layer structure was constructed via hydrogen bonds and by weak π-π stacking interactions. A four-step thermal decomposition occurred in the temperature range 25-900°C under nitrogen. 2011 Copyright (CC) SCS.