Issue 5, 2006
From the journal:

Dalton Transactions

The influence of ligand field effects on the magnetic exchange of high-spin Co(ii)-semiquinonate complexes†

Alessandro Bencini,*a   Alessandra Beni,a   Ferdinando Costantino,ab   Andrea Dei,*a   Dante Gatteschia  and  Lorenzo Soracea  

* Corresponding authors

a UdR INSTM and Dipartimento di Chimica, Università di Firenze, Via della Lastruccia 3, Sesto Fiorentino (FI), Italy
E-mail: andrea.dei@unifi.it, alessandro.bencini@unifi.it
Fax: +390554573372
Tel: +390554573328

b UdR INSTM and Dipartimento di Chimica, Università di Perugia, Via Elce di Sotto 8, Perugia (PG), Italy

Abstract

[Co(Me4cyclam)(tropolonate)](PF6) was synthesised and structurally characterised. Its electronic and W-band EPR spectra have been analysed by means of the angular overlap calculation of the Spin Hamiltonian parameters that provided also a satisfactory reproduction of the temperature dependence of the magnetic susceptibility. The present results can be interpreted assuming a pseudo-octahedral character for the Co(II) center. This prompted us to reconsider the model formerly used for the analysis of the magnetic coupling between hs-Co(II) and the paramagnetic o-semiquinonate ligand in the corresponding derivatives [Co(Me4cyclam)(PhenSQ)](PF6) and [Co(Me4cyclam)(DTBSQ)](PF6). These results indicate that the effect of the magnetic coupling is active only below 50 K and that a more refined model of exchange coupling between Co(II) and semiquinonato ligands is needed to quantitatively analyze the magnetic behaviour of this class of systems.

Graphical abstract: The influence of ligand field effects on the magnetic exchange of high-spin Co(ii)-semiquinonate complexes

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Article information

DOI
https://doi.org/10.1039/B508769D
Article type
Paper
Submitted
22 Jun 2005
Accepted
06 Oct 2005
First published
28 Oct 2005

Dalton Trans., 2006, 722-729

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The influence of ligand field effects on the magnetic exchange of high-spin Co(II)-semiquinonate complexes

A. Bencini, A. Beni, F. Costantino, A. Dei, D. Gatteschi and L. Sorace, Dalton Trans., 2006, 722 DOI: 10.1039/B508769D

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