Synthesis and physical properties of halogen-bridged Ni-Pd mixed-metal complexes, Ni1−xPdx(chxn)2XY2

A series of single crystals of quasi-one-dimensional Ni-Pd mixed-metal MX-chain compounds, Ni 1-x Pd x (chxn) 2 Cl 3 , and mixed-halogen MX-chain compounds, Ni(chxn) 2 Cl y Br 1-y (NO 3 ) 2 have been obtained by electrochemical oxidation methods. In order to investigate the competition between the electron-correlation in the Ni III states and the electron-phonon interaction in the Pd II -Pd IV states in the Ni-Pd mixed-metal compounds, the IR, Raman spectra have been measured. These results show that the Pd II -Pd IV mixed-valence states are influenced by Ni III and gradually approaching to the Pd III states with the increase of the Ni III components In order to investigate the effect of bridging halogen, the optical conductivity spectra of Ni(chxn) 2 Cl y Br 1-y (NO 3 ) 2 have been measured.