Structure and vibrational spectra of tungstovanadate compounds containing an anion of the keggin type. Structure of the salt [(CH3)2NCHO]4−H4[VW11V1O40]·2[(CH3)2·NCHO]·2H2O

1990 ◽  
Vol 31 (2) ◽  
pp. 285-291 ◽  
Author(s):  
R. F. Klevtsova ◽  
L. A. Glinskaya ◽  
E. N. Yurchenko ◽  
L. V. Derkach ◽  
A. M. Rios ◽  
...  
Keyword(s):  
Vibrational Spectra ◽  
Type Structure ◽  
Keggin Type

Oxidation of Benzaldehyde to Benzoic Acid with Aqueous Hydrogen Peroxide over Dodecatungstophosphoric Acid

2013 ◽  
Vol 781-784 ◽  
pp. 219-222
Author(s):  
Qiu Ying Huang ◽  
Bei Bei Dong ◽  
Xiu Cheng Zheng
Keyword(s):  
Hydrogen Peroxide ◽  
Benzoic Acid ◽  
Catalytic Reaction ◽  
Type Structure ◽  
Optimal Parameters ◽  
Reaction Parameters ◽  
Aqueous Hydrogen Peroxide ◽  
Reaction Conditions ◽  
Prepared Sample ◽  
Keggin Type

Dodecatungstophosphoric acid was synthesized and used as catalyst for oxidation of benzaldehyde to benzoic acid with aqueous hydrogen peroxide. The effect of various catalytic reaction parameters including time, temperatures, and the amount of catalyst on the yield of benzoic acid was investigated in details. The results indicated that the as-prepared sample was in the keggin-type structure and the optimal parameters under the reaction conditions were as follows: 0.5 g of catalyst, reacted at 80 C for 5 h.

Structure and vibrational spectra of tungstovanadate compounds containing an anion of the Keggin type. The structure of the salt (C2N2H10)2[VW11V1O40]�6H2O

1989 ◽  
Vol 30 (3) ◽  
pp. 427-432 ◽  
Author(s):  
L. A. Glinskaya ◽  
�. N. Yurchenko ◽  
R. F. Klevtsova ◽  
L. V. Derkach ◽  
A. M. Rios ◽  
...  
Keyword(s):  
Vibrational Spectra ◽  
Keggin Type

Synthesis of polypyrrole and polythiophene in aqueous solution of Keggin-type structure heteropolyanions

1991 ◽  
Vol 41 (1-2) ◽  
pp. 407-410 ◽  
Author(s):  
Mieczyslaw Łapkowski ◽  
Gerard Bidan ◽  
Michel Fournier
Keyword(s):  
Aqueous Solution ◽  
Type Structure ◽  
Keggin Type

Über Tetrachlorothallate(III) und -indate(III) mit Scheelit-Struktur / Tetrachlorothallates(III) and -indates(III) of Scheelite Type Structure

1979 ◽  
Vol 34 (11) ◽  
pp. 1512-1518 ◽  
Author(s):  
Gerhard Thiele ◽  
Bernd Grunwald ◽  
Werner Rink ◽  
Dietrich Breitinger
Keyword(s):  
Single Crystal ◽  
Vibrational Spectra ◽  
Structural Parameters ◽  
Type Structure ◽  
Crystal Data

Abstract Tetrachlorothallates MTlCl4 (M=K, Rb and NH4) crystallizing in the tetragonal CaWO4 type were obtained by crystallization from highly concentrated aqueous TlCl3 solutions containing small amounts of MCI. The structural parameters of NH4TlCl4 were determined from single-crystal data. The indates MInCL4 (M=K, Rb and NH4) are isotypic. The vibrational spectra of the tetrachlorothallates were discussed.

Bildung von Nitridokomplexen durch Ammonolyse von Metallhalogeniden mit NH4+. Synthese und Struktur von (NH4)3Nb2NBr10, (NH4)3Ta2NI10 und (NH4)3W2NBr10 / Formation of Nitrido Complexes by Ammonolysis of Metal Halides with NH4+. Synthesis and Structure of (NH4)3Nb2NBr10, (NH4)3Ta2NI10 and (NH4)3W2NBr10

1986 ◽  
Vol 41 (4) ◽  
pp. 423-428 ◽  
Author(s):  
Manfredo Hörner ◽  
Klaus-Peter Frank ◽  
Joachim Strähle
Keyword(s):  
Vibrational Spectra ◽  
Type Structure ◽  
Point Symmetry ◽  
Metal Halides ◽  
Space Group ◽  
Lattice Constants ◽  
Disordered Structure ◽  
Nitrido Complexes

The reaction of WCl6 or ReCl5 with NH4Cl in a sealed glas ampoule between 350 and 400 °C yields the hexachlorometallates(IV ) (NH4)2MCl6. MoCl5 forms (NH4)2MoC16 at 275 °C, whereas at 420 °C (NH4)3Mo2C19 is obtained. The salts (NH4)2MC16 crystallize in the K2PtCl6 type structure. NbBr5, WBr6 and Tal5 undergo ammonolysis reactions with NH4+ forming the nitrido complexes M2NX103- with a symmetrical nitrido bridge M = N = M . The com plexes have the point symmetry D4h. (NH4)3Nb2NBr10 crystallizes in the tetragonal space group P4/mnc with a = 727.8, c = 1932.9 pm and Z = 2. For (NH4)3Ta2NI10 a partially disordered structure in the tetragonal space group I4/mmm was observed. The lattice constants are a - 162.5, c - 1990.2 pm, Z = 2. (NH4)3W2NBr10 was obtained in the form of an am orphous powder. The vibrational spectra of the nitrido com plexes are assigned and discussed

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