Deuterium isotope effect in the two-step spin-state transition of [FeII(5-NO2-sal-N(1,4,7,10))] investigated by Mössbauer spectroscopy and magnetic susceptibility
✍ Scribed by A. Bousseksou; L. Tommasi; G. Lemercier; F. Varret; J.-P. Tuchagues
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 470 KB
- Volume
- 243
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Deuteration of the secondary amine functions of 4,7,10))] has been performed in order to investigate the H/D isotope effect on the intermolecular hydrogen bond network responsible for the propagation of the two-step spin-state transition along the linear chains of this unique material. M/~ssbauer spectroscopy and magnetic susceptibility studies show that the two-step spin-state crossover is retained upon deuteration. However, the critical temperatures experience a different increase upon deuteration (140.5 to 150.3 K (Tel), 176.8 to 183 K (To2)) while there is no noticeable variation in the cooperativeness of the two transitions upon deuteration. The proposed interpretation for the different H/D isotope effect on the two steps of this spin-state transition is based upon the changes in hydrogen bond lengths resulting from the two structural phase transitions of 4,7,10))] reported in the literature.