Issue 8, 2003
From the journal:

Physical Chemistry Chemical Physics

Unexpected isotope effect on the spin transition of the coordination polymer Fe(C5H5N)2[Ni(CN)4]†

Kazumasa Hosoya,‡a   Takafumi Kitazawa,*a   Masashi Takahashi,a   Masuo Takeda,a   Jean-François Meunier,b   Gábor Molnárb  and  Azzedine Bousseksou*b  

* Corresponding authors

a Department of Chemistry, Faculty of Science, Toho University, Miyama, Funabashi, Chiba, Japan
E-mail: kitazawa@chem.sci.toho-u.ac.jp
Fax: 81-47-475-1855

b Laboratoire de Chimie de Coordination, CNRS UPR-8241, 205 route de Narbonne, Toulouse, France
E-mail: boussek@lcc-toulouse.fr
Fax: +33-(0)561553003

Abstract

The two-dimensional coordination polymer spin-crossover compound Fe(pyridine)2[Ni(CN)4] (1) and its isotope substituted analogues Fe(pyridine-D5)2[Ni(CN)4] (2) and Fe(pyridine-15N)2[Ni(CN)4] (3) have been synthesised and the isotope effect on the thermal spin-crossover behaviour has been studied using magnetic susceptibility, 57Fe Mössbauer, Raman and calorimetric techniques. All these methods confirmed that upon isotope substitution—contrary to previous observations—the spin transition temperature shifted downwards from 202 to 194 K. The theoretical analysis of spectroscopic data has revealed that this shift was a result of a subtle balance between different vibrational and electronic factors.

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Article information

DOI
https://doi.org/10.1039/B212312F
Article type
Paper
Submitted
13 Dec 2002
Accepted
19 Feb 2003
First published
10 Mar 2003

Phys. Chem. Chem. Phys., 2003,5, 1682-1688

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Unexpected isotope effect on the spin transition of the coordination polymer Fe(C5H5N)2[Ni(CN)4]

K. Hosoya, T. Kitazawa, M. Takahashi, M. Takeda, J. Meunier, G. Molnár and A. Bousseksou, Phys. Chem. Chem. Phys., 2003, 5, 1682 DOI: 10.1039/B212312F

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