title: χ-Octamolybdate [Mo(V)4Mo(VI)4O24](4-): an unusual small polyoxometalate in partially reduced form from nonaqueous solvent reduction.
abstract: The first mixed-valent octamolybdate anion [Mo(V)(4)Mo(VI)(4)O(24)](4-), termed χ-octamolybdate due to its shape, was obtained by partial reduction of α-(Bu(4)N)(4)-[Mo(8)O(26)] in dry acetonitrile. Single-crystal X-ray structure analysis revealed that the anion includes an unusual Mo(V)(4)O(8) cubane-like cluster core, whose four side faces are capped by four MoO(4) units to form a crosslike cluster. X-ray photoelectron spectroscopy (XPS) and bond valence sum (BVS) calculations were carried out to validate the presence of mixed-valent Mo centers.
authors.affiliation: Department of Chemistry, Tsinghua University, Beijing 100084, PR China.
authors.forename: Longsheng
authors.initials: L
authors.lastname: Wang
authors.forename: Panchao
authors.initials: P
authors.lastname: Yin
authors.forename: Jin
authors.initials: J
authors.lastname: Zhang
authors.forename: Jian
authors.initials: J
authors.lastname: Hao
authors.forename: Chunlin
authors.initials: C
authors.lastname: Lv
authors.forename: Fengping
authors.initials: F
authors.lastname: Xiao
authors.forename: Yongge
authors.initials: Y
authors.lastname: Wei
mesh_terms: D018360:Crystallography, X-Ray; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D008982:Molybdenum / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry*; D017973:Tungsten Compounds / Q000737:chemistry*; D000099294:Polyoxometalates
chemical_list: D008982:Molybdenum; D012997:Solvents; D017973:Tungsten Compounds; C102296:polyoxometalate I; D000099294:Polyoxometalates