The Complex of Diearbonyl(methylcyclopentadienyl)molybdenum with Carbonyl(cyclopentadienyl)nitrosyl[tris(phenylacetylenide)stan-nyl]manganese: Synthesis and Molecular Formula

摘要

A reaction of CpMn(CO)(NO)Sn(C=CPh)3 (I) with [Cp'Mo(CO)2]2 (Cp' = MeC5H4) gave CpMn(CO)(NO)Sn(C=CPh)3[Cp'Mo(CO)2]2 (II) as dark red prismatic crystals. The molecular structure of complex II was determined by X-ray diffraction study. Complex II contains the Mo-Mo bond (2.9799(5) A), which is perpendicular to the coordinated C=C bond. The latter is longer (1.371(5) A) than free acetylenide fragments (1.190(5) and 1.198(5) A). In addition, the angle Sn-C=C for the coordinated C=C bond is smaller (134.1(3)°) than that in free fragments (173.5(4)° and 171.9(4)°). The Mn-Sn bond length in complex II (2.5662(7) A) is close to that in complex I (2.5328( 17) A) and is much shorter than the sum of the corresponding covalent radii (2.78 A). The Sn-C bond (2.108(4) A) in the acetylenide fragment π-bound to two Mo atoms (average Mo-C, 2.19 A), as well as the other Sn-C bonds (2.119(4) and 2.135(4) A), remains virtually the same as in complex I (average 2.105 A).