title: Icosaniobate: a new member of the isoniobate family.
abstract: Icosaniobate [Nb20O54]8- was synthesized by reacting [H4Nb6O19]4- with NO in tetrahydrofuran or MeNO2. A single-crystal X-ray diffraction study of its n-tetrabutylammonium salt [a = 17.7284(18) A, b = 33.542(3) A, c = 34.316(2) A, Z = 4, and space group P22(1)2(1)] revealed a dimeric structure where two decaniobate ions are condensed sharing two terminal O atoms. Unlike that in [(NbW5O18)2O]4-, the Nb-O-Nb bridges in icosaniobate are bent. The nonlinear bridging reduces the maximum possible symmetry of the dimeric anion to mm2, which it closely approximates.
authors.affiliation: Department of Chemistry, Kwansei Gakuin University, Sanda 669-1337, Japan.
authors.forename: Masaki
authors.initials: M
authors.lastname: Maekawa
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Ozawa
authors.forename: Atsushi
authors.initials: A
authors.lastname: Yagasaki