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

Hachuła Barbara (Institute of Chemistry, University of Silesia, Katowice, Poland)
Pędras Monika (Institute of Chemistry, University of Silesia, Katowice, Poland)
Nowak Maria (Institute of Physics, University of Silesia, Katowice, Poland)
Kusz Joachim (Institute of Physics, University of Silesia, Katowice, Poland)
Pentak Danuta (Institute of Chemistry, University of Silesia, Katowice, Poland)
Borek Jerzy (Institute of Chemistry, University of Silesia, Katowice, Poland)

А novel manganese(II) coordination polymer, catena-(2- methylimidazolium bis(μ2-chloro)-aqua-chloromanganese(II)), {(C4H7N2)[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)º, V = 938.0(5) Å3, Z = 4 and R1 = 0.03. The title compound consisted of onedimensional 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.

Keywords: manganese(II) complex, 2-methylimidazole, X-ray crystal structure, IR spectra, EPR spectra