title: Di-μ(3)-oxido-di-μ(2)-oxido-tetra-oxido-bis-(1,1,2,2-tetra-methyl-ethylenedicyclo-penta-dien-yl)-dimolyb-denum(IV)-dimolybdenum(VI) hexa-hydrate.
abstract: The title compound, [Mo(4)(C(16)H(20))(2)O(8)]·6H(2)O, is a centrosymmetric ansa-molybdocene complex in which two dinuclear [C(2)Me(4)(η(5)-C(5)H(4))(2)]Mo(μ(2)-O)(2)MoO(2) units dimerize by forming two μ(3)-O bridges between three Mo atoms. The ansa-molybdocene [C(2)Me(4)(η(5)-C(5)H(4))(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 (μ(2)-O)(μ(3)-O)(2)MoO(2) group has a distorted trigonal-bipyramidal coordination. The Mo-(μ(3)-O) and Mo-(μ(2)-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)-(μ(3)-O) bond distance between the units [1.9986 (14) Å]. The solvent water mol-ecules together with complex O atoms form a network of O-H⋯O hydrogen bonds.
authors.affiliation: Department of Chemistry, 1253 University of Oregon, Eugene, Oregon 97403-1253, USA.
authors.forename: Takiya J
authors.initials: TJ
authors.lastname: Ahmed
authors.forename: Lev N
authors.initials: LN
authors.lastname: Zakharov
authors.forename: David R
authors.initials: DR
authors.lastname: Tyler