The preparation and crystal structure of trinuclear molybdenum compound（Me4N）[Mo3（μ3-O）(μ-Cl)3（μ-O2CH）3Cl3]

The title compound was prepared by the oxidation of MoClin liquid phase.Thecrystal belongs to the orthorhombic system with space group D-Pmnb and unit cell parameters:a=11.403（1）,b=12.345（2）,c=14.292（2）■;V=2011.8 ■;Z=4,D=2.396g/cm.Altogether 2303independent reflections were collected on a CAD-4 four-circle diffractometer with Mo Kα radiationin range 2°≤θ≤27°.The crystal structure was solved by heavy-atoms method and refined byfull-matrix least-squares technique to final discrepancy factors R=0.050 and R=0 056 for 1513reflections of I≥3σ（I）.The configuration of the cluster anion was characterized to be of the sameM1 type structure as presented in the previous paper.The average bond lengths of Mo-Mo andMo-（μ-O）are 2.577 ■ and 1.982 ■ respectively.In addition,the effects of bridging atoms,otherligands and bond orders on Mo-Mo bonds are discussed briefly.