Acta Crystallographica Section E (Nov 2008)
Di-μ3-oxido-di-μ2-oxido-tetraoxidobis(1,1,2,2-tetramethylethylenedicyclopentadienyl)dimolybdenum(IV)dimolybdenum(VI) hexahydrate
Abstract
The title compound, [Mo4(C16H20)2O8]·6H2O, is a centrosymmetric ansa-molybdocene complex in which two dinuclear [C2Me4(η5-C5H4)2]Mo(μ2-O)2MoO2 units dimerize by forming two μ3-O bridges between three Mo atoms. The ansa-molybdocene [C2Me4(η5-C5H4)2]Mo unit has a typical bent-sandwich metallocene structure with an inter-ring angle of 127.98 (8)°. The Mo atom in the bridging (μ2-O)(μ3-O)2MoO2 group has a distorted trigonal–bipyramidal coordination. The Mo—(μ3-O) and Mo—(μ2-O) bond distances inside the units [2.0869 (14) and 2.1014 (15) Å, respectively] are slightly longer than the Mo(−x + 1, −y + 1, −z)—(μ3-O) bond distance between the units [1.9986 (14) Å]. The solvent water molecules together with complex O atoms form a network of O—H...O hydrogen bonds.