Sub-picosecond time resolved infrared spectroscopy of high-spin state formation in Fe(ii) spin crossover complexes.

Sub-picosecond time resolved infrared spectroscopy of high-spin state formation in Fe(ii) spin crossover complexes.
复制标题

Fe(ii) 自旋交叉配合物中高自旋态形成的亚皮秒时间分辨红外光谱

DOI:
10.1039/b802607f
复制
发表时间:
2008
期刊:
Physical chemistry chemical physics : PCCP
影响因子:
--
通讯作者:
R. Diller
R. Diller
中科院分区:
--
文献类型:
--
作者:
M.M.N. Wolf;R. Groß;C. Schumann;J.A. Wolny;V. Schünemann;A. Døssing;H. Paulsen;J.J. McGarvey;R. Diller

文献摘要

参考文献

被引文献

相似文献

用室温下的超快瞬态红外光谱首次研究了铁(II)自旋交叉体系[Fe(btpa)](PF 6)2和[Fe(B(bdpa))](PF 6)2在溶液中的光诱导低自旋(S = 0)到高自旋(S = 2)跃迁.在387 nm激发后,在仪器系统响应时间350 fs内出现的1000和1065 cm−1之间的负和正红外差带显示了振动非弛豫和热高自旋5 T2态的形成。[Fe(btpa)](PF 6)2/丙酮的振动弛豫时间常数为9.4 ± 0.7 ps,[Fe(btpa)](PF 6)2/乙腈和[Fe(B(bdpa)](PF 6)2/乙腈的振动弛豫时间常数为12.7 ± 0.7 ps.振动分析已通过DFT计算的低自旋和高自旋态正常模式的两种化合物,以及它们各自的红外吸收截面。模拟的红外差谱主要由高自旋态形成后的吸收截面的增加,根据实验的红外光谱。
The photoinduced low-spin (S = 0) to high-spin (S = 2) transition of the iron(II) spin-crossover systems [Fe(btpa)](PF6)2 and [Fe(b(bdpa))](PF6)2 in solution have been studied for the first time by means of ultrafast transient infrared spectroscopy at room temperature. Negative and positive infrared difference bands between 1000 and 1065 cm−1 that appear within the instrumental system response time of 350 fs after excitation at 387 nm display the formation of the vibrationally unrelaxed and hot high-spin 5T2 state. Vibrational relaxation is observed and characterized by the time constants 9.4 ± 0.7 ps for [Fe(btpa)](PF6)2/acetone and 12.7 ± 0.7 ps for both [Fe(btpa)](PF6)2/acetonitrile and [Fe(b(bdpa)](PF6)2/acetonitrile. Vibrational analysis has been performed via DFT calculations of the low-spin and high-spin state normal modes of both compounds as well as their respective infrared absorption cross sections. The simulated infrared difference spectra are dominated by an increase of the absorption cross section upon high-spin state formation in accordance with the experimental infrared spectra.
DOI: 10.1021/ic000656t
发表时间: 2001
影响因子: 4.6
作者:
S. Schenker;P. Stein;J. Wolny;C. Brady;J. McGarvey;H. Toftlund;A. Hauser
通讯作者: A. Hauser
DOI: 10.1021/j100019a010
发表时间: 1995
期刊: The Journal of Physical Chemistry
影响因子: --
作者:
T. Lian;Y. Kholodenko;B. Locke;R. Hochstrasser
通讯作者: R. Hochstrasser
DOI: 10.1021/ic049809t
发表时间: 2004-07-12
影响因子: 4.6
作者:
Brady, C;Callaghan, PL;Wolny, JA
通讯作者: Wolny, JA
通过亚皮秒红外观察到的卤视紫红质的初级反应动力学:振动光谱
DOI: 10.1016/j.chemphys.2005.08.036
发表时间: 2006
期刊: Chemical Physics
影响因子: 2.3
作者:
F. Peters;J. Herbst;J. Tittor;D. Oesterhelt;R. Diller
通讯作者: R. Diller
铁 (II) 分子晶体的各向异性核非弹性散射。
DOI: 10.1103/physrevlett.86.1351
发表时间: 2001
影响因子: 8.6
作者:
H. Paulsen;R. Benda;C. Herta;V. Schünemann;A. Chumakov;L. Duelund;H. Winkler;H. Toftlund;A. Trautwein
通讯作者: A. Trautwein