TY - JOUR
T1 - Charge-bistable Pd(iii)/Pd(ii,iv) coordination polymers
T2 - Phase transitions and their applications to optical properties
AU - Kumagai, Shohei
AU - Takaishi, Shinya
AU - Iguchi, Hiroaki
AU - Yamashita, Masahiro
N1 - Publisher Copyright:
© 2015 The Royal Society of Chemistry.
PY - 2015/5/14
Y1 - 2015/5/14
N2 - Quasi-one-dimensional halogen-bridged Pt, Pd, and Ni complexes (MX chains) are a family of materials with potential charge bistability: M(ii)-M(iv) mixed valence charge-density-wave (CDW) and M(iii) averaged valence Mott-Hubbard (MH) states can form. However, until recently, no examples of MX chains showing charge bistability have been reported. Charge-bistable Pd MX chains, [Pd(en)2Br](Y1-Cn)2·H2O (en = 1,2-diaminoethane; Y1-Cn = dialkyl 2-sulfosuccinate; n = the number of carbon atoms in alkyl chains) and [Pd(en)2Br](Y2-Cn)2·H2O (Y2-Cn = dialkyl α-sulfomalonate), both of which showed phase transitions between Pd(iii) MH and Pd(ii,iv) CDW states, were prepared by utilizing chemical pressure. In addition, [Pd(en)2Br](Y1-Cn)2·H2O underwent pressure- and photo-induced MH-CDW phase transitions. [Pd(en)2Br](Y2-Cn)2·H2O has a higher transition temperature, i.e., higher stability of the MH state, than [Pd(en)2Br](Y1-Cn)2·H2O does due to the difference in the crystal packing. The recent progress will lead to new pressure sensing and optical switching devices.
AB - Quasi-one-dimensional halogen-bridged Pt, Pd, and Ni complexes (MX chains) are a family of materials with potential charge bistability: M(ii)-M(iv) mixed valence charge-density-wave (CDW) and M(iii) averaged valence Mott-Hubbard (MH) states can form. However, until recently, no examples of MX chains showing charge bistability have been reported. Charge-bistable Pd MX chains, [Pd(en)2Br](Y1-Cn)2·H2O (en = 1,2-diaminoethane; Y1-Cn = dialkyl 2-sulfosuccinate; n = the number of carbon atoms in alkyl chains) and [Pd(en)2Br](Y2-Cn)2·H2O (Y2-Cn = dialkyl α-sulfomalonate), both of which showed phase transitions between Pd(iii) MH and Pd(ii,iv) CDW states, were prepared by utilizing chemical pressure. In addition, [Pd(en)2Br](Y1-Cn)2·H2O underwent pressure- and photo-induced MH-CDW phase transitions. [Pd(en)2Br](Y2-Cn)2·H2O has a higher transition temperature, i.e., higher stability of the MH state, than [Pd(en)2Br](Y1-Cn)2·H2O does due to the difference in the crystal packing. The recent progress will lead to new pressure sensing and optical switching devices.
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U2 - 10.1039/c5dt00439j
DO - 10.1039/c5dt00439j
M3 - Review article
AN - SCOPUS:84928978223
SN - 1477-9226
VL - 44
SP - 8590
EP - 8599
JO - Dalton Transactions
JF - Dalton Transactions
IS - 18
ER -