title: New crown-shaped polyoxovanadium(V) cluster cation with a mu(6)-sulfato anion and zwitterionic mu-(beta-alanine): crystal structure of [V(6)O(12)(OH)(3)(O(2)CCH(2)CH(2)NH(3))(3)(SO(4))][Na][SO(4)].13H(2)O.
abstract: Treatment of vanadium(V) oxide with an ethanol-concentrated sulfuric acid mixture, followed by the addition of an equimolar amount of beta-alanine and sodium hydroxide, and finally raising the pH to 3.9 with sodium carbonate solution, under continuous heating in a water bath and in the presence of air, leads to the polyionic sodium cyclo-[mu(6)-(sulfato-O,O',O'')tris[mu-(beta-alanine-O,O')-mu-oxo]tris(mu-hydroxo-mu-oxo)hexa[oxovanadium(V)]] sulfate tridecahydrate which crystallizes in the monoclinic P2(1)/n space group [a = 9.5192(4), b = 20.1185(9), c = 22.6174(9) A, beta = 97.011(1) degrees; Z = 4]. The crown-shaped polyoxovanadium(V) cluster cation, with carboxylate-bridging amino acid ligands, has an Anderson structure with two unique capping sulfato ligands. Its structural analysis, together with IR, UV-vis, and preliminary data on its solution properties, is presented.
authors.affiliation: School of Arts and Science, Tunku Abdul Rahman College, 53300 Kuala Lumpur, Malaysia. ngch@mail.tarc.edu.my
authors.forename: Chew Hee
authors.initials: CH
authors.lastname: Ng
authors.forename: Chai Wei
authors.initials: CW
authors.lastname: Lim
authors.forename: Siang Guan
authors.initials: SG
authors.lastname: Teoh
authors.forename: Hoong-Kun
authors.initials: HK
authors.lastname: Fun
authors.forename: Anwar
authors.initials: A
authors.lastname: Usman
authors.forename: Seik Weng
authors.initials: SW
authors.lastname: Ng