TY - JOUR
T1 - Observation of charge bistability in quasi-one-dimensional halogen-bridged palladium complexes by X-ray absorption spectroscopy
AU - Yoshida, Takefumi
AU - Takaishi, Shinya
AU - Kumagai, Shohei
AU - Iguchi, Hiroaki
AU - Mian, Mohammad Rasel
AU - Yamashita, Masahiro
N1 - Funding Information:
This work was partially supported by the Asahi Glass Foundation, the Institute for Quantum Chemical Exploration (IQCE), a JSPS KAKENHI grant (A) 26248015 and grant (C) 16K05713, and the Tohoku University Molecule & Materials Synthesis Platform in the Nanotechnology Platform Project sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. This work was performed under the approval of the Photon Factory Program Advisory Committee (KEK, Proposal No. 2016P007). The authors acknowledge Dr Hiroaki Nitani at KEK-PF for his attentive help with the measurements. M. Yamashita acknowledges the support by the 111 project (B18030).
Publisher Copyright:
© 2019 The Royal Society of Chemistry.
PY - 2019
Y1 - 2019
N2 - 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.
AB - 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.
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U2 - 10.1039/c9dt01684h
DO - 10.1039/c9dt01684h
M3 - Article
C2 - 31241098
AN - SCOPUS:85070366249
VL - 48
SP - 11628
EP - 11631
JO - Dalton Transactions
JF - Dalton Transactions
SN - 1477-9226
IS - 31
ER -