Fe2+ spin transition in [Fe(trz)(Htrz)2](BF4) as evidenced by a variable temperature EPR study |
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| Authors: | C Cantin J Kliava Y Servant L Sommier O Kahn |
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| Institution: | 1. Centre de Physique Moléculaire Optique et Hertzienne, Université Bordeaux-I, 351, cours de la Libération, F-33405, Talence Cedex, France
2. Institut de Chimie de la Matière Condensée de Bordeaux, Laboratoire des Sciences Moléculaires, Pessac, France
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| Abstract: | The EPR of Fe3+ ions has been used for the first time to evidence a low-spin (S=0) to high-spin (S=2) transition of Fe2+ ions in an octahedral ferrous complex Fe(trz)(Htrz)2](BF4). The temperature dependence of the intensity of the Fe3+ EPR line atg=4.3 reveals a spin transition which occurs for the Fe2+ ions, with hysteresis. The transition temperatures areT c↑=374 K in the warming mode andT c↓=345 K in the cooling mode. The analysis of the EPR spectral data indicates the presence of a structural phase transition accompanying the spin transition. |
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