Femtosecond optical pump-probe reflectivity studies of spin-state photo-switching in the spin-crossover molecular crystals [Fe(PM-AzA)2(NCS)2]

被引：22
作者：
Marino, Andrea [1 ]
Servol, Marina [1 ]
Bertoni, Roman [1 ]
Lorenc, Maciej [1 ]
Mauriac, Cindy [2 ]
Letard, Jean-Francois [2 ]
Collet, Eric [1 ]
机构：
[1] Univ Rennes 1, CNRS, UMR 6251, Inst Phys Rennes, F-35042 Rennes, France
[2] Univ Bordeaux, CNRS, ICMCB, F-33608 Pessac, France
来源：
POLYHEDRON | 2013年 / 66卷
关键词：
Spin crossover; Femtochemistry; LIESST; Phase transitions; Laser spectroscopy; CRITICAL-TEMPERATURE; ELECTRON-TRANSFER; LASER-SHOT; TRANSITION; IRON(II); DYNAMICS; COMPLEX; SPECTROSCOPY; RELAXATION;
D O I：
10.1016/j.poly.2013.03.009
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
We report here on the ultrafast photo-switching dynamics of a Fe(II) molecular material [Fe(PM-AzA)(2)(NCS)(2)]. It undergoes a thermal spin-crossover which can be detected by magnetic measurements or by optical reflectivity. We use here femtosecond optical reflectivity to study the ultrafast photo-switching dynamics. Our results indicate that the HS state is reached from the LS state within less than 100 fs, through an intermediate MLCT state. This ultrafast relaxation from the electronic excited state towards the structurally relaxed HS state is followed by a vibrational cooling of the hot HS molecules within approximate to 1 ps timescale. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：123 / 128
页数：6
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