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Issue 44, 2016
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Hydrogen-bonded networks of [Fe(bpp)2]2+ spin crossover complexes and dicarboxylate anions: structural and photomagnetic properties†

Verónica Jornet-Mollá,a   Yan Duan,a   Carlos Giménez-Saiz, ORCID logo a   João C. Waerenborghb  and  Francisco M. Romero*a  
Author affiliations

* Corresponding authors

a Instituto de Ciencia Molecular, Universitat de València, P. O. Box 22085, 46071-Valencia, Spain
E-mail: fmrm@uv.es
Fax: +34 963543273
Tel: +34 963544405

b Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, 2695-066 Bobadela LRS, Portugal
E-mail: jcarlos@ctn.ist.utl.pt
Fax: +351 21 994 6185
Tel: +351 21 994 6220

Abstract

The paper reports the syntheses, crystal structures, thermal and (photo)magnetic properties of spin crossover salts of formula [Fe(bpp)2](C6H8O4)·4H2O (1·4H2O), [Fe(bpp)2](C8H4O4)·2CH3OH·H2O (2·2MeOH·H2O) and [Fe(bpp)2](C8H4O4)·5H2O (2·5H2O) (bpp = 2,6-bis(pyrazol-3yl)pyridine; C6H8O4 = adipate dianion; C8H4O4 = terephthalate dianion). The salts exhibit an intricate network of hydrogen bonds between low-spin iron(II) complexes and carboxylate dianions, with solvent molecules sitting in the voids. Desolvation is accompanied by a low-spin (LS) to high-spin (HS) transformation in the materials. The dehydrated phase 2 undergoes a two-step transition with a second step showing thermal hysteresis (T1/2↑ = 139 K and T1/2↓ = 118 K). 2 displays a quantitative LS to HS photomagnetic conversion, with a T(LIESST) value of 63 K.

Graphical abstract: Hydrogen-bonded networks of [Fe(bpp)2]2+ spin crossover complexes and dicarboxylate anions: structural and photomagnetic properties

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Article information

https://doi.org/10.1039/C6DT02934E
Submitted
25 Jul 2016
Accepted
19 Oct 2016
First published
24 Oct 2016
Dalton Trans., 2016,45, 17918-17928
Article type
Paper
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Hydrogen-bonded networks of [Fe(bpp)2]2+ spin crossover complexes and dicarboxylate anions: structural and photomagnetic properties

V. Jornet-Mollá, Y. Duan, C. Giménez-Saiz, J. C. Waerenborgh and F. M. Romero, Dalton Trans., 2016, 45, 17918
DOI: 10.1039/C6DT02934E

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