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Titolo:
Synthesis and characterization of the water-soluble, all-inorganic composition, Keggin-type triniobium(V)-substituted SiW9Nb3O407- heteropolyoxoanions with alkali metal countercations (Li+, Na+,K+, and Cs+)
Autore:
Nomiya, K; Ohsawa, K; Taguchi, T; Kaneko, M; Takayama, T;
Indirizzi:
Kanagawa Univ, Fac Sci, Dept Mat Sci, Hiratsuka, Kanagawa 2591293, Japan Kanagawa Univ Hiratsuka Kanagawa Japan 2591293 a, Kanagawa 2591293, Japan Kanagawa Univ, Fac Engn, Dept Appl Chem, Yokohama, Kanagawa 2218686, JapanKanagawa Univ Yokohama Kanagawa Japan 2218686 ma, Kanagawa 2218686, Japan
Titolo Testata:
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
fascicolo: 11, volume: 71, anno: 1998,
pagine: 2603 - 2610
SICI:
0009-2673(199811)71:11<2603:SACOTW>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUPPORTED ORGANOMETALLIC COMPLEX; ATOMICALLY DISPERSED IRIDIUM(I); MASS-SPECTROSCOPY FABMS; OXIDE ANALOGS; TRISUBSTITUTED HETEROPOLYTUNGSTATES; CATALYST PRECURSORS; TRANSITION-METALS; CRYSTAL-STRUCTURE; SODIUM SALT; P-31 NMR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Nomiya, K Kanagawa Univ, Fac Sci, Dept Mat Sci, Hiratsuka, Kanagawa 2591293, Japan Kanagawa Univ Hiratsuka Kanagawa Japan 2591293 a 2591293, Japan
Citazione:
K. Nomiya et al., "Synthesis and characterization of the water-soluble, all-inorganic composition, Keggin-type triniobium(V)-substituted SiW9Nb3O407- heteropolyoxoanions with alkali metal countercations (Li+, Na+,K+, and Cs+)", B CHEM S J, 71(11), 1998, pp. 2603-2610

Abstract

The Keggin-type triniobium(V)-substituted tungstoheteropolyanion, A-beta-SiW9Nb3O407-, was synthesized as its hepta alkali-metal salts of Li+, Na+, K, and Cs+ countercations. These alkali-metal salts were useful for allowing the crystallization of SiW9Nb3O407-, itself, and/or the SiW9Nb3O407--supported organometallic complexes, as well as controlling the water solubilityof these complexes. The analytically pure compounds, obtained as homogeneous colorless solids via a stoichiometric reaction of the (Bu4N)(6)H2Si2W18Nb6O77, (Nb-O-Nb)(3)-bridged anhydride with the corresponding alkali tetrafluoroborates, and then with the alkali hydroxides, were compositionally characterized by complete elemental analyses, TG/DTA and FABMS spectra. They were structurally characterized by FT-IR and solution W-183 NMR measurements,as well as solid-state CP/MAS and GHD/MAS Si-29 NMR and solution (29) Si NMR measurements. The cation-dependent properties of these heteropolytungstates in the solid state were observed in the thermal stabilities, the amounts of hydrated water and adsorbed water, the solubilities in water and in organic solvents, and in the ease of crystallization.

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Documento generato il 05/12/20 alle ore 09:44:53