Electronic State of A Hydrogen-Doped Copper Coordination Polymer: N , N ′-bis-(hydroxyethyl)dithiooxamidatocopper(II), (HOC 2 H 4 ) 2 dtoa Cu

Hydrogen doping was electrochemically performed on the title coordination polymer, catena- w - N , N '-bis-(hydroxyethyl)dithiooxamidatocopper(II), (HOC 2 H 4 ) 2 dtoa Cu. From X-ray photoelectron spectroscopy, the oxidation state of Cu(II) in (HOC 2 H 4 ) 2 dtoa Cu was revealed to be reduced to the Cu(I,II) mixed-valence state on hydrogen doping. While the spin susceptibility increases during initial hydrogen doping, it decreases and then shows no temperature dependence as the hydrogen doping proceeds. The temperature-independent behavior is supposed to be derived from Pauli paramagnetism. Coordination polymer Hydrogen doping Spin susceptibility X-ray photoelectron spectroscopy.