Structure and Electrochemical Properties of Directly Bound Dinuclear Cobaltadithiolene Complexes. Substituent Effect on Reduction Potentials and Mixed-Valence States
作者:Takeo Akiyama、Masaki Amino、Tsutomu Saitou、Koutoku Utsunomiya、Ken-ichi Seki、Yoshiharu Ikoma、Masatsugu Kajitani、Toru Sugiyama、Kunio Shimizu、Akira Sugimori
DOI:10.1246/bcsj.71.2351
日期:1998.10
between two aryl groups in solutions. Electrochemical and spectrochemical investigations revealed that in electrically neutral state, the interaction between two cobaltadithiolene moieties is small, while in monoanioic state it becomes greater. The Hammett’s plot for ΔEr1/2 (ΔEr1/2 = Er1/2(red.1) − Er1/2(red.2)) shows that the electron-attracting substituents can stabilize the mixed-valence state,
双核钴二硫烯配合物 μ-(1,4-二取代 1,3-丁二烯-1,2,3,4-四硫醇)-双[(η5-环戊二烯基)钴 (III) 的 X 射线结构和电化学性质],已经调查过了。在二苯基衍生物中,同一分子中的两个苯环相距3.5A,而在二甲基衍生物中,两个甲基相距很远。然而,在电中性双核配合物中,没有证据表明溶液中两个芳基之间存在分子内相互作用。电化学和光谱化学研究表明,在电中性状态下,两个二硫醇钴部分之间的相互作用很小,而在单阴离子状态下,它变得更大。ΔEr1/2 的哈米特图 (ΔEr1/2 = Er1/2(red.1) − Er1/2(red. 2)) 表明吸电子取代基可以稳定混合价态 [Co(II)-Co(III)]-。具有芳基取代基的配合物的较小 ΔEr1/2 值...