Synthesis and Crystal Structure of a New Mn8 Compound with Tripodal Ligand

A new manganese compoundMn8(tmp)2(Htmp)4((CH3)3 CCO2)4(py)2Cl2].2py(1.2py,H3tmp=1,1,1-tri(hydroxymethyl)propane,ph=pyramid)has been synthesized and its structure was characterized by IR,elemental analysis and X-ray diffraction.Compound 1 belongs to the triclinic system,space group P1 with a=13.378(5),b=14.334(5),C=15.012(6)(A),α=107.637(5),β=95.635(3),γ=92.825(4)°,V=2720.7(17)(A)3,Z=1,C76H124N4O26Cl2Mn8,Mr=2022.23,Dc=1.234 Mg/m3,μ=1.007 mm-1,F(000)=1052,T=293(2)K,the final R=0.0755 and wR=0.2163 for all 6463 observed reflections(I>2σ(I)).X-ray analysis shows that the core of 1contains aMn8]mixed-valence rod-like unit consisting of six edge-sharing triangles(Mn3),each of which is bridged by a μ3-oxygen atom.