title: Cation-Dependent Self-assembly of Vanadium Polyoxoniobates.
abstract: Reaction of Na7H[Nb6O19]·15H2O with NaVO3·2H2O at 220 °C in the presence of NaHCO3gives new bicapped α-Keggin vanadododecaniobate [VNb12O40{NbO(CO3)}2]13-, isolated and structurally characterized as Na9H4[VNb12O40{NbO(CO3)}2]·37H2O (1). According to51V NMR and ESI-MS data, this anion equilibrates in solution with [VNb12O40]15-and oligomeric species that result from dissociation of the {NbO(CO3)}+fragments. In the presence of potassium, the same reaction gives [VxNb24O76]n-(x = 4, n = 12 (2a); x = 3, n = 17 (2b)). The anions with x = 3 and 4 cocrystallize together, but exist as separate entities both in solid and in solution according to51V MAS NMR and ESI-MS data.
authors.affiliation: Nikolaev Institute of Inorganic Chemistry SB RAS , Novosibirsk, Russia 630090.|Novosibirsk State University , Novosibirsk, Russia 630090.
authors.forename: Pavel A
authors.identifier: http://orcid.org/0000-0003-4479-5100
authors.initials: PA
authors.lastname: Abramov
authors.affiliation: Nikolaev Institute of Inorganic Chemistry SB RAS , Novosibirsk, Russia 630090.|Novosibirsk State University , Novosibirsk, Russia 630090.
authors.forename: Anastasiia T
authors.initials: AT
authors.lastname: Davletgildeeva
authors.affiliation: Nikolaev Institute of Inorganic Chemistry SB RAS , Novosibirsk, Russia 630090.
authors.forename: Nikolay K
authors.initials: NK
authors.lastname: Moroz
authors.affiliation: Nikolaev Institute of Inorganic Chemistry SB RAS , Novosibirsk, Russia 630090.
authors.forename: Nikolay B
authors.initials: NB
authors.lastname: Kompankov
authors.affiliation: Central Institute for Engineering, Electronics and Analytics - ZEA-3, Forschungszentrum Jülich , 52425, Jülich, Germany.
authors.forename: Beatrix
authors.initials: B
authors.lastname: Santiago-Schübel
authors.affiliation: Nikolaev Institute of Inorganic Chemistry SB RAS , Novosibirsk, Russia 630090.|Novosibirsk State University , Novosibirsk, Russia 630090.
authors.forename: Maxim N
authors.initials: MN
authors.lastname: Sokolov