Issue 23, 2012
From the journal:

Dalton Transactions

Molybdenum- and tungsten(ii) monometallic 3-(2-pyridyl)pyrazole and bimetallic 3-(2-pyridyl)pyrazolate complexes†

Marta Arroyo,a   Daniel Miguel,a   Fernando Villafañe,*a   Elisabete C. B. Alegriabc  and  Armando J. L. Pombeirob  

* Corresponding authors

a IU CINQUIMA/Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, 47005 Valladolid, Spain
E-mail: fervilla@qi.uva.es

b Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, Technical University of Lisbon, 1049-001 Lisbon, Portugal
E-mail: pombeiro@ist.utl.pt

c Área Departamental de Engenharia Química, Instituto Superior de Engenharia de Lisboa, Rua Conselheiro Emídio Navarro, Lisbon, Portugal

Abstract

Molybdenum and tungsten complexes containing the pypzH (3-(2-pyridyl)pyrazole) ligand as a chelating bidentate are prepared: [Mo(CO)4(pypzH)], cis-[MoBr(η3-allyl)(CO)2(pypzH)], cis-[MoCl(η3-methallyl)(CO)2(pypzH)], [MI2(CO)3(pypzH)] (M = Mo, W) from [Mo(CO)4(NBD)] or the adequate bis(acetonitrile) complexes. The deprotonation of the molybdenum allyl or methallyl complexes affords the bimetallic complexes [cis-{Mo(η3-allyl)(CO)2(μ2-pypz)}]2 or [cis-{Mo(η3-methallyl)(CO)2(μ2-pypz)}]2 (μ2-pypz = μ2-3-(2-pyridyl-κ1N)pyrazolate-2κ1N). The allyl complex was subjected to an electrochemical study, which shows a marked connection between both metallic centres through the bridging pyridylpyrazolates.

Graphical abstract: Molybdenum- and tungsten(ii) monometallic 3-(2-pyridyl)pyrazole and bimetallic 3-(2-pyridyl)pyrazolate complexes

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Article information

DOI
https://doi.org/10.1039/C2DT12388F
Article type
Paper
Submitted
11 Dec 2011
Accepted
18 Apr 2012
First published
20 Apr 2012

Dalton Trans., 2012,41, 7017-7025

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Molybdenum- and tungsten(II) monometallic 3-(2-pyridyl)pyrazole and bimetallic 3-(2-pyridyl)pyrazolate complexes

M. Arroyo, D. Miguel, F. Villafañe, E. C. B. Alegria and A. J. L. Pombeiro, Dalton Trans., 2012, 41, 7017 DOI: 10.1039/C2DT12388F

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