Observation of charge bistability in quasi-one-dimensional halogen-bridged palladium complexes by X-ray absorption spectroscopy
Observation of charge bistability in quasi-one-dimensional halogen-bridged palladium complexes by X-ray absorption spectroscopy
复制标题
X射线吸收光谱观察准一维卤桥钯配合物的电荷双稳定性
DOI：
10.1039/c9dt01684h
复制
发表时间：
2019
影响因子：
4
通讯作者：
Masahiro Yamashita
中科院分区：
文献类型：
--
作者：
Takefumi Yoshida;Shinya Takaishi;Shohei Kumagai;Hiroaki Iguchi;Mohammad Rasel Mian;Masahiro Yamashita
我们进行了X射线吸收精细结构（XAFS）测量三个代表性的溴桥钯化合物。在X射线吸收近边结构（XANES）谱中，平均价（AV）化合物[Pd 3+（dabdOH）2Br] Br 2（1：dabdOH =（2S，3S）-2，3-丁二醇二胺）和混合价（MV）化合物[Pd 2+（en）2][Pd 4+（en）2Br 2]（ReO 4）4（2）在它们的光谱中显示出显著的差异。另一方面，在显示MV-AV相变的[Pd（en）2Br]（Suc-C5）2·H2O（3：en =乙二胺，Suc-C5 =磺基琥珀酸二戊酯）中，由于氧化态的细微差异，几乎观察不到相变温度以下和以上之间的光谱差异。在扩展X射线吸收精细结构（EXAFS）谱，一个明显的差异，在Pd-Br相关区域观察到的相变。
We performed X-ray absorption fine structure (XAFS) measurements on three representative bromo-bridged palladium compounds. In the X-ray absorption near-edge structure (XANES) spectra, the averaged-valence (AV) compound, [Pd3+(dabdOH)2Br]Br2 (1: dabdOH = (2S,3S)-2,3-diaminobutane-1,4-diol), and the mixed-valence (MV) compound, [Pd2+(en)2][Pd4+(en)2Br2](ReO4)4 (2), showed significant differences in their spectra. In [Pd(en)2Br](Suc-C5)2·H2O (3: en = ethylenediamine, Suc-C5 = dipentylsulfosuccinate), which exhibits an MV–AV phase transition, on the other hand, the spectroscopic difference between below and above the phase transition temperature was hardly observed due to the subtle difference in the oxidation states. In the extended X-ray absorption fine structure (EXAFS) spectra, a clear difference in the Pd–Br correlation region was observed upon the phase transition.