Multicomponent Polyanions. 46. Characterization of the Isomeric Keggin Decamolybdodivanadophosphate Ions In Aqueous Solution by 31P and 51V NMR

Autor:	John H. Grate, Anna Selling, Ingegaerd Andersson, Lage Pettersson
Rok vydání:	1994
Předmět:	Inorganic Chemistry Crystallography Aqueous solution Chemistry Structural isomer A value Physical and Theoretical Chemistry Mass spectrometry Ion Characterization (materials science) Conjugate
Zdroj:	Inorganic Chemistry. 33:982-993
ISSN:	1520-510X 0020-1669
DOI:	10.1021/ic00083a023
Popis:	The Keggin decamolybdodivanadophosphate ions have been studied in aqueous 0.6 M Na(Cl) medium by potentiometry and 31 P (202.5 MHz) and 51 V (131.55 MHz) NMR spectrometry. An assignment of all detected resonances of decamolybdodivanadophosphate species to individual Keggin isomers is proposed. The five positional isomers of α-[Mo 10 V 2 PO 40 ] 5- were identified and characterized. Two minor [Mo 10 V 2 PO 40 ] 5- species, probably β-Keggin isomers, were also observed. The pK a values of the conjugate monoprotonated species, [HM 10 V 2 PO 40 ] 4- , have been precisely determined from the 31 P and 51 V chemical shift vs pH behavior, using α-[Mo 10 V 2 PO 40 ] 4- as internal standard
Databáze:	OpenAIRE
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