Some observations on the u.v. absorption spectra of niobium(V) chlorocomplexes

Miranda, C. Ferreira de; Silveira, Marieta Da; Vernois, J.

doi:10.1016/0022-1902(70)80063-x

Cited by 7 publications

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“…In the solid state, the existence of the complex ion NbOCl 5 2- has been demonstrated by Raman and IR spectroscopy and by X-ray diffraction studies on [As(C 6 H 5 ) 4 ] 2 NbOCl 5 ·2CH 2 Cl 2 and it is also known to be present in solid RbNbOCl 5 and CsNbOCl 5 . In solution, NbOCl 5 2- has been identified in hydrochloric acid, in various nonaqueous solvents, , and in CsCl−NbOCl 3 melts with CsCl in excess . NbOCl 4 - ions formed in the latter melts 10 when less CsCl was added, and the presence of this complex was also indicated in acetonitrile 8,9 and dioxane 9 solutions.…”

Section: Introductionmentioning

confidence: 95%

Electrochemical and Spectroscopic Studies of the Chloro and Oxochloro Complex Formation of Nb(V) and Ta(V) in NaCl−AlCl₃ Melts

Barner

Bjerrum

2005

Inorg. Chem.

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The equilibrium constant for the chloro complex formation of Nb(V) NbCl6-<--->NbCl5+Cl- (i) in NaCl-AlCl3 melts at 175 degrees C was found to be pKi = 2.86(5). The oxochloro complex formation of Nb(V) and Ta(V) in NaCl-AlCl3 melts at 175 degrees C could be explained by the following equilibria: MOCl4- <-->MOCl3+Cl- (ii) MOCl3<-->MOCl2(+)+Cl- (iii) where M = Nb and Ta. The equilibrium constants determined by potentiometric measurements with chlorine-chloride electrodes were, for M = Nb, pKii = 2.21(4) and pKiii = 3.95(5) and, for M = Ta, pKii = 2.743(15) and pKiii = 4.521(13). NbCl6- has two bands in the UV-vis region, a strong one at 34.7 x 10(3) cm-1 and a weaker one at 41.6 x 10(3) cm-1. The MOCl4- complexes showed in the case of Nb(V) absorption bands at 32.7 and 42.9 x 10(3) cm-1 and in the case of Ta(V) at 38.6 and 48.1 x 10(3) cm-1.

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Section: Introductionmentioning

confidence: 95%

Electrochemical and Spectroscopic Studies of the Chloro and Oxochloro Complex Formation of Nb(V) and Ta(V) in NaCl−AlCl₃ Melts

Barner

Bjerrum

2005

Inorg. Chem.

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Electron Transfer Spectra of the Hexachloro‐ and Hexabromoniobate(V) and Tantalate(V) Anions

Valloton

Merbach

1974

Helvetica Chimica Acta

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The electron transfer spectra of the hexachloro‐ and hexabromoniobate (V), and‐tantalate(V) anions are investigated with particular care to avoid hydrolysis products. New interpretations are given, and the optical electronegativities χ of Nb(V) and Ta(V) are recalculated. The difference between both χ values is 0.2, in better agreement with the differences observed for metals of the second and third transition series.

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Dictionary of Inorganic Compounds

Macintyre¹,

Daniel²,

Stirling³

1992

Dictionary of Inorganic Compounds

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Some observations on the u.v. absorption spectra of niobium(V) chlorocomplexes

Cited by 7 publications

References 11 publications

Electrochemical and Spectroscopic Studies of the Chloro and Oxochloro Complex Formation of Nb(V) and Ta(V) in NaCl−AlCl₃ Melts

Electrochemical and Spectroscopic Studies of the Chloro and Oxochloro Complex Formation of Nb(V) and Ta(V) in NaCl−AlCl₃ Melts

Electron Transfer Spectra of the Hexachloro‐ and Hexabromoniobate(V) and Tantalate(V) Anions

Dictionary of Inorganic Compounds

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Some observations on the u.v. absorption spectra of niobium(V) chlorocomplexes

Cited by 7 publications

References 11 publications

Electrochemical and Spectroscopic Studies of the Chloro and Oxochloro Complex Formation of Nb(V) and Ta(V) in NaCl−AlCl3 Melts

Electrochemical and Spectroscopic Studies of the Chloro and Oxochloro Complex Formation of Nb(V) and Ta(V) in NaCl−AlCl3 Melts

Electron Transfer Spectra of the Hexachloro‐ and Hexabromoniobate(V) and Tantalate(V) Anions

Dictionary of Inorganic Compounds

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Product

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Electrochemical and Spectroscopic Studies of the Chloro and Oxochloro Complex Formation of Nb(V) and Ta(V) in NaCl−AlCl₃ Melts

Electrochemical and Spectroscopic Studies of the Chloro and Oxochloro Complex Formation of Nb(V) and Ta(V) in NaCl−AlCl₃ Melts