A Tri-μ-O-S-O Manganese Dimer： Synthesis, Structral and EPR Study

A Tri-μ-O-S-O coordinative manganese dimer： [Mn2（SO4）2（phen）4]oCH3OH （phen= 1,10-phenanthroline） （1） was yielded by the reaction of 1,10-phenanthroline and MnSO4~H20 in a mixed solvent of methanol and acetonitrile under room temperature and was structurally characterized. Single crystal analysis shows that complex 1 has poly- meric structure based on binuclear Mn（II） units bridged by O-S-O groups of two SO2 anion. The UV spectrum of the complex clarifies that each metal-organic building unit parallels with each other through the π-π interactions of face-to-face separations of two 1,10-phen planes among the complex, forming a layered structure. And the elec- tronic paramagnetic resonance （EPR） signal clearly indicates that those manganese atoms in complex 1 are in ＋2 oxidation states.