Authors: Reid, R S.; Clark, Rhett J.; Quagraine, Emmanuel K.

Source: Canadian Journal of Chemistry, Volume 85, Number 12, December 2007 , pp. 1083-1089(7)

Publisher: NRC Research Press

Abstract:

The UV-visible spectra of various thiomolybdates have been studied. Cross-contamination during synthesis and extensive overlap in the spectra have hindered the UV-vis characterization to date. We report the use of multivariate curve fitting for the accurate quantification of the composition of thiomolybdate mixtures as well as the molar absorptivities at key wavelengths of the spectrum of each pure thiomolybdate. The synthesis and isolation of all four thiomolybdates by a common synthetic route using (NH₄)₂S is also reported. This is the first time that monothiomolybdate has been isolated from aqueous solution.Key words: Thiomolybdates, UV-visible spectroscopy, speciation, curve fitting.

On a déterminé les spectres UV-visible de divers thiomolybdates. Des contaminations croisées au cours des synthèses et des recouvrements dans les spectres avaient toujours empêché leur caractérisation jusqu'à maintenant. On a fait appel à une méthode d'ajustement de courbe à plusieurs variables pour faire une quantification précise de la composition de mélanges de thiomolybdates et pour déterminer les absorptivités molaires à des longueurs d'onde clés des spectres de chacun des thiomolybdates purs. On rapporte aussi la synthèse et l'isolement de chacun des quatre thiomolybdates par une voie de synthèse commune à l'aide de (NH₄)₂S. C'est la première fois que le monothiomolybdate a pu être isolé à partir d'une solution aqueuse.Mots-clés : thiomolybdates, spectroscopie UV-visible, spéciation, ajustement de courbe.[Traduit par la Rédaction]

Document Type: Research article

Publication date: 2007-12-01

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