Observation of charge bistability in quasi-one-dimensional halogen-bridged palladium complexes by X-ray absorption spectroscopy

被引：6

作者：

Yoshida, Takefumi ^{[1
]}

Takaishi, Shinya ^{[1
]}

Kumagai, Shohei ^{[1
]}

Iguchi, Hiroaki ^{[1
]}

Mian, Mohammad Rasel ^{[1
]}

Yamashita, Masahiro ^{[1
,2
,3
]}

机构：

[1] Tohoku Univ, Grad Sch Sci, Dept Chem, 6-3 Aza Aoba, Sendai, Miyagi 9808578, Japan

[2] Tohoku Univ, WPI Adv Inst Mat Res, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan

[3] Nankai Univ, Sch Mat Sci & Engn, Tianjin 300350, Peoples R China

来源：

DALTON TRANSACTIONS | 2019年 / 48卷 / 31期

关键词：

RESONANCE RAMAN-SPECTRA; LINEAR-CHAIN COMPLEXES; PD-BR CHAIN; MIXED-VALENCE; MOTT-HUBBARD; STATE; PLATINUM; PHASE; TRANSITION; CATALYSTS;

D O I：

10.1039/c9dt01684h

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

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)(2)Br] Br-2 (1: dabdOH = (2S,3S)-2,3-diaminobutane-1,4-diol), and the mixed-valence (MV) compound, [Pd2+(en)(2)][Pd4+(en)(2)Br-2](ReO4)(4) (2), showed significant differences in their spectra. In [Pd(en)(2)Br] (Suc-C-5)(2)center dot H2O (3: en = ethylenediamine, Suc-C-5 = 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.

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页码：11628 / 11631

页数：4

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