Mixed-valence states stabilized by proton transfer in a hydrogen-bonded biimidazolate rhenium dimer

Makoto Tadokoro, Tomonori Inoue, Satoru Tamaki, Keisuke Fujii, Kazuo Isogai, Hiroshi Nakazawa, Sadamu Takeda, Kiyoshi Isobe, Nobuaki Koga, Akio Ichimura, Kazuhiro Nakasuji