水素結合と電子状態
1998 年 40 巻 1 号 p. 83-89
詳細
1998 年 40 巻 1 号 p. 83-89
In this report, the cooperation of electron and proton in organic-inorganic hybrid systems is discussed.
Particularly, the experimental results of the X-ray diffraction measurements on the 1-D metallic charge-transfer crystal of [Pd (H2-xEDAG) (HEDAG) ] TCNQ (EDAG=ethylenediaminoglyoxime, x=ca. 0.7) were focused. Below the metal-insulator (M-I) phase transition (180 K), commensurate superlattice reflections were observed with a period of c*/2, c*/3, and c*/12 along the 1-D axis, c. The full X-ray diffraction analyses of temperature-dependent reflections ignoring the superlattice spots show remarkable anomalies of the temperature factors below 180 K for several atoms which associate with the intermolecular H-bonds between donor-molecules. This is a result of cooperation between the order-disorder transition of the 1-D H-bond intermolecular superlattice and the M-I transition of the 1-D electronic state in TCNQ acceptor stacks. These experimental results support a model of purely 1-D metallic hole-conduction introduced by partial deprotonation of H-bonds in the ligands of [Pd (H2-xEDAG) (HEDAG) ] .
