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Matrix effects on the high-spin -> low-spin relaxation in [M1-xFex(bpy)3](PF6)2 (M = Cd, Mn, and Zn, bpy=2,2'-bipyridine)

Chan, I. Y.
Published in Chemical Physics Letters. 1998, vol. 297, no. 3-4, p. 281-286
Abstract Temperature-dependent laser flash photolysis experiments on the low-spin iron(II) systems [M1−xFex(bpy)3](PF6)2 (M=Cd, Mn and Zn, x≈0.01, bpy=2,2'-bipyridine) under external pressure are presented. Below 50 K the high-spin→low-spin relaxation is an almost temperature-independent tunnelling process. Above that temperature it tends towards a thermally activated behaviour. A change of the host from cadmium to zinc results in an increase of the low-temperature tunnelling rate constant by two orders of magnitude. An external pressure of 1 kbar accelerates the low-temperature tunnelling process by a factor of 2. [Mn1−xFex(bpy)3](PF6)2 and [Zn1−xFex(bpy)3](PF6)2 show a phase transition at ≈1.1 kbar, which increases the tunnelling rate by a factor of about 6.
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Research group Groupe Hauser
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SCHENKER, Sabine et al. Matrix effects on the high-spin -> low-spin relaxation in [M1-xFex(bpy)3](PF6)2 (M = Cd, Mn, and Zn, bpy=2,2'-bipyridine). In: Chemical Physics Letters, 1998, vol. 297, n° 3-4, p. 281-286. https://archive-ouverte.unige.ch/unige:2762

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Deposited on : 2009-09-21

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