Issue 1, 2011
From the journal:

RSC Advances

Two mononuclear iron(ii) complexes of 4-phenylpyrazole-5-carbaldehyde derived ligands are stabilised in different spin states†

Juan Olguín,a   Guy N. L. Jamesona  and  Sally Brooker*a  

* Corresponding authors

a Department of Chemistry and The MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago, PO Box 56, Dunedin 9054, New Zealand
E-mail: sbrooker@chemistry.otago.ac.nz
Fax: +64 3 479 7906
Tel: +64 3 479 7919

Abstract

The polydentate acyclic ligand 4-phenylpyrazole-5-carbaldehyde azine, H2L1, has been prepared and characterised. A second 4-phenylpyrazole-5-carbaldehyde derived ligand, H2L2, was prepared in situ by condensation with o-phenylendiamine. Two mononuclear iron(II) complexes, [FeII(HL2)(MeOH)(NCSe)]·H2O and [FeII(H2L1)2](BF4)2·solvents, have been synthesised from 1 : 1 and 2 : 3 M:L reactions, respectively. No dinuclear, helical, species were obtained from 2 : 3 M:L reactions regardless of the solvent employed (MeOH, MeCN or NO2Me). An X-ray structure determination on the latter complex reveals that it is low spin at 90 K. Mössbauer spectra confirm this, and show that the former complex is, in contrast, high spin, even at 4.6 K.

Graphical abstract: Two mononuclear iron(ii) complexes of 4-phenylpyrazole-5-carbaldehyde derived ligands are stabilised in different spin states

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Article information

DOI
https://doi.org/10.1039/C1RA00190F
Article type
Paper
Submitted
20 May 2011
Accepted
03 Jun 2011
First published
18 Jul 2011

RSC Adv., 2011,1, 52-57

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Two mononuclear iron(II) complexes of 4-phenylpyrazole-5-carbaldehyde derived ligands are stabilised in different spin states

J. Olguín, G. N. L. Jameson and S. Brooker, RSC Adv., 2011, 1, 52 DOI: 10.1039/C1RA00190F

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