Issue 10, 2002
From the journal:

Journal of the Chemical Society, Dalton Transactions

NMR and X-ray diffraction studies of the complexation of D-(−)quinic acid with tungsten(vi) and molybdenum(vi)

M. Luísa Ramos,a   Mariette M. Pereira,a   Ana Matos Beja,b   Manuela R. Silva,b   José A. Paixãob  and  Victor M. S. Gila  

a Departamento de Química, FCT, Universidade de Coimbra, 3004-535 Coimbra, Portugal
E-mail: vgil@ci.uc.pt

b Departamento de Física, FCT, Universidade de Coimbra, 3004-535 Coimbra, Portugal

Abstract

By using multinuclear (1H, 13C, 17O, 95Mo, 183W) magnetic resonance spectroscopy (1D and 2D), quinic acid is found to form 2 homologous complexes with both tungsten(VI) and molybdenum(VI), in aqueous solution. Two isomeric 1 ∶ 2 (metal ∶ ligand) complexes involving the carboxylate and the adjacent OH groups are present in the pH range 2–11. One of the W(VI) complexes with quinic acid, WO2(C7H10O6)22− has been isolated in the solid state and characterised by X-ray diffraction, the tungsten atom being six-coordinated in an approximate square bipyramidal geometry. This structure is identical to that proposed for the most stable complex in solution. In the presence of hydrogen peroxide and with both metals, quinic acid forms one 1 ∶ 1 ∶ 2 (metal ∶ ligand ∶ peroxide) species, also involving the carboxylate and the adjacent OH groups.

Graphical abstract: NMR and X-ray diffraction studies of the complexation of D-(−)quinic acid with tungsten(vi) and molybdenum(vi)

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Article information

DOI
https://doi.org/10.1039/B109564C
Article type
Paper
Submitted
19 Oct 2001
Accepted
19 Mar 2002
First published
16 Apr 2002

J. Chem. Soc., Dalton Trans., 2002, 2126-2131

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NMR and X-ray diffraction studies of the complexation of D-(−)quinic acid with tungsten(VI) and molybdenum(VI)

M. L. Ramos, M. M. Pereira, A. M. Beja, M. R. Silva, J. A. Paixão and V. M. S. Gil, J. Chem. Soc., Dalton Trans., 2002, 2126 DOI: 10.1039/B109564C

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