title: Li2GeMo3O8: a novel reduced molybdenum oxide containing Mo3O13 cluster units.
abstract: The crystal structure of the title compound, dilithium germanium trimolybdenum octa-oxide, consists of distorted hexa-gonal-close-packed oxygen layers with stacking sequence ABAC along [001] that are held together by alternating lithium-germanium and molybdenum layers. The two Li(+) and Ge(4+) ions all have site symmetry 3m. and occupy, respectively, tetra-hedral and octa-hedral sites in the ratio 2:1. The Mo atom has a formal oxidation state of +3.3 and occupies an octa-hedral site (site symmetry .m.) and forms strongly bonded triangular cluster units [Mo-Mo distance = 2.4728 (8) Å] involving three MoO6 octa-hedra that are each shared along two edges, constituting an Mo3O13 unit.
authors.affiliation: Institut des Sciences, Chimiques de Rennes, UMR 6226 CNRS - INSA Rennes - Université de Rennes 1, Avenue du Général Leclerc, 35042 Rennes Cedex, France.
authors.forename: Philippe
authors.initials: P
authors.lastname: Gall
authors.affiliation: Institut des Sciences, Chimiques de Rennes, UMR 6226 CNRS - INSA Rennes - Université de Rennes 1, Avenue du Général Leclerc, 35042 Rennes Cedex, France.
authors.forename: Patrick
authors.initials: P
authors.lastname: Gougeon
keywords: crystal structure; germanium; lithium; reduced molybdenum oxide; triangular Mo3 cluster