OPTICAL AND MAGNETIC-PROPERTIES OF THE HALOGEN-BRIDGED METAL-COMPLEXES MODIFIED BY HYDROGEN BONDINGS - (M(1R,2R-CYCLOHEXANEDIAMINE)2BR)BR(M=PT, PD, AND NI)

被引：136

作者：

OKAMOTO, H ^{[1
]}

TORIUMI, K ^{[1
]}

MITANI, T ^{[1
]}

YAMASHITA, M ^{[1
]}

机构：

[1] NAGOYA UNIV,COLL GEN EDUC,DEPT CHEM,NAGOYA,AICHI 464,JAPAN

来源：

PHYSICAL REVIEW B | 1990年 / 42卷 / 16期

关键词：

D O I：

10.1103/PhysRevB.42.10381

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Polarized reflection and ESR measurements have been carried out on single crystals of newly synthesized halogen-bridged one-dimensional (1D) metal complexes {M(chxn)2Br}Br2 (M=Pt, Pd, Ni; chxn=1R,2R-cyclohexanediamine), which have tight hydrogen bonds between ligands (chxn) and counter anions (Br-) and construct a two-dimensional (2D) hydrogen-bond network. Both the polarized reflection spectra and the temperature-dependent ESR signals indicate that the electronic state of M=Ni is essentially different from that of M=Pt (or Pd). From the analysis of these results, it can be concluded that the complex for M=Ni is in a monovalent state, where a Mott insulator is formed in a (-Ni3+-Br - ) regular chain, in contrast to the mixed-valent state (-M2+-Br - M4+-Br - ) for M=Pt and Pd. Thermally excited paramagnetic spins observed for the Pd complex can be explained by the soliton-kink model under the influence of the 2D hydrogen-bond network. © 1990 The American Physical Society.

引用

页码：10381 / 10387

页数：7

共 25 条

[1]

AOKI R, 1982, MOL CRYST LIQ CRYST, V81, P301

[2] LINEAR MAGNETIC CHAINS WITH ANISOTROPIC COUPLING [J].