Thermal and Light-Induced Spin Switching Dynamics in the 2D Coordination Network of {[Zn1-xFex(bbtr)3](ClO4)2}∞ : The Role of Cooperative Effects

Article Article scientifique Article Thermal and Light-Induced Spin Switching Dynamics in the 2D Coordination Network of {[Zn1-xFex(bbtr)3](ClO4)2}∞ : The Role of Cooperative Effects eng 2012 author Chakraborty Pradip 691335 author Enachescu Cristian 543144 author Walder Christophe 592529 author Bronisz Robert author Hauser Andreas 111359 9714-9722 10.1021/ic301006c 0020-1669 The thermal spin transition, the photoexcitation, and the subsequent spin relaxation in the mixed crystal series of the covalently linked two-dimensional network {[Zn1-xFex(bbtr)3](ClO4)2}∞ (x = 0.02–1, bbtr =1,4-di(1,2,3-triazol-1-yl)-butane) are discussed. In the neat compound, the thermal spin transition with a hysteresis of 13 K is accompanied by a crystallographic phase transition (Kusz, J.; Bronisz, R.; Zubko, M.; Bednarek, H. Chem. Eur. J.2011, 17, 6807). In contrast, the diluted crystals with x ≤ 0.1 stay essentially in the high-spin state down to low temperatures and show typical first order relaxation kinetics upon photoexcitation, and the structural phase transition is well separated from the spin transition. With increasing Fe(II) concentration, steeper thermal transitions and sigmoidal relaxation curves indicate increasingly important cooperative effects. Already at x = 0.38, the spin relaxation is governed by cooperative interactions between Fe(II) centers, and the crystallographic phase transition begins to influence the spin transition. The kinetic behavior of the thermal spin transition is reproduced within the framework of a dynamic mean-field model. Dewey 540 38 Département de chimie physique 142 false 687 Groupe Hauser Inorganic chemistry 51 18 4a6a418a-f410-4240-a48e-b26d0fe18d5d Article (Published version) Restricted ref01311.pdf 656590 application/pdf restrictedAccess Faculté des sciences / Section de chimie et biochimie / Département de chimie physique

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Thermal and Light-Induced Spin Switching Dynamics in the 2D Coordination Network of {[Zn1-xFex(bbtr)3](ClO4)2}∞ : The Role of Cooperative Effects	Inorganic chemistry			2012	655	0

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Walder, Christophe