Zur Chemie von Uranglimmern mit Trimetavanadationen und Schichstruktur (Uvanit), II / The Chemistry of Uranylvanadates with Trimetavanadate Ions and Layer Structure (Uvanite), II
Open Access
- 1 August 1973
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung B
- Vol. 28 (7-8) , 408-415
- https://doi.org/10.1515/znb-1973-7-805
Abstract
The interlayer cations of uvanite can be exchanged quantitatively by n-alkylammoniumions according to M+[UO2V3O9] + CnH 2n+1NH3 +⇄ CnH2n+1NH3[UO2V3O9] + M+. In the stoichiometric compounds the alkyl chains of the cations (n= 6-18) are poorlyordered in monolayers and oriented nearly perpendicular to the uranyltrimetavanadatelayers though the space filling is unfavorable with this arrangement. During the cationexchange at pH = 7-9 additional free amine molecules are taken up yielding 1:1 intercalationcomplexes (CnH2n+1NHs) (CnH an+1NH2) [UO2V3O9] with close-packed, well ordered monolayers of alkyl compounds. With excess of pureamines or pure alkanols 1: 3 intercalation complexes (CnH2n+1NH3) (CnH2n+1NH2),[UO2V3O9] or (CnH2n+1NH3) (Cn·H2n+1OH )s[UO2V3O9 (n, n′ = 6-18] are formed with the alkyl chains ordered to bimolecular layers. These complexes rearrange at higher temperature into new phases as a consequence of rotationalisomerisation of the alkyl chains.Keywords
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