Issue 21, 2001
From the journal:

Journal of the Chemical Society, Dalton Transactions

Polynuclear molybdenum and tungsten complexes of 3-hydroxypicolinic acid and the crystal structures of (nBu4N)2[Mo4O12(picOH)2] and (nHex4N)2[Mo2O6(picOH)2]

Susana M. O. Quintal,a   Helena I. S. Nogueira,*a   Helena M. Carapuça,a   Vitor Félixa  and  Michael G. B. Drewb  

* Corresponding authors

a Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal
E-mail: helena@dq.ua.pt

b Department of Chemistry, The University, Whiteknights, Reading, UK

Abstract

New polynuclear molybdenum(VI) and tungsten(VI) complexes with 3-hydroxypicolinic acid (HpicOH) (nBu4N)2[Mo4O12(picOH)2] 1, (nHex4N)2[Mo2O6(picOH)2] 2, (BezPh3P)2[W2O6(picOH)2] 3 (Bez = benzyl) and [M2O5(picOH)2]·nH2O (M = Mo(VI), n  = 2 4 or W(VI), n  = 8 5) have been prepared. The crystal structures of 1 and 2 were determined by X-ray diffraction. The tetramolybdate 1 containing two coordinatively bound 3-hydroxypicolinate anions is a rare example of a discrete tetranuclear molybdenum-oxo cluster showing a Mo4O12 core with the molybdenum centres bonded through oxo bridges only; the organic ligands being in a peripheral position. Infrared, 1H and 13C-{1H} NMR spectroscopic data for the complexes are presented together with electrochemical characterization by cyclic voltammetry. These complexes are active toward oxygen atom transfer reactions and can catalyze the oxidation of benzoin (1,2-diphenyl-2-hydroxyethanone) with dmso.

Graphical abstract: Polynuclear molybdenum and tungsten complexes of 3-hydroxypicolinic acid and the crystal structures of (nBu4N)2[Mo4O12(picOH)2] and (nHex4N)2[Mo2O6(picOH)2]

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Article information

DOI
https://doi.org/10.1039/B103348B
Article type
Paper
Submitted
17 Apr 2001
Accepted
14 Aug 2001
First published
11 Oct 2001

J. Chem. Soc., Dalton Trans., 2001, 3196-3201

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Polynuclear molybdenum and tungsten complexes of 3-hydroxypicolinic acid and the crystal structures of (nBu4N)2[Mo4O12(picOH)2] and (nHex4N)2[Mo2O6(picOH)2]

S. M. O. Quintal, H. I. S. Nogueira, H. M. Carapuça, V. Félix and M. G. B. Drew, J. Chem. Soc., Dalton Trans., 2001, 3196 DOI: 10.1039/B103348B

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