作者:Dmitrii F. Perepichka、Igor F. Perepichka、Anatolii F. Popov、Martin R. Bryce、Andrei S. Batsanov、Antony Chesney、Judith A.K. Howard、Nikolai I. Sokolov
DOI:10.1016/s0022-328x(01)00948-2
日期:2001.12
structures for ferrocene derivatives 8a, 8g, and 11d were determined by single-crystal X-ray diffraction. Tetranitro derivative 8a shows substantial distortion, caused by steric repulsion between the nitro groups in positions 4 and 5, which precludes the formation of stacks, and pairs of fluorene moieties contact face-to-face (interplanar distance 3.8 Å). In di- and trinitro derivatives 8g and 11d the
二茂铁甲醛13及其乙烯基化合物(E,E)-1-二茂铁基-4-甲酰基-1,3-丁二烯(16)与硝基芴作为CH酸的反应会生成Fc-π型推挽式化合物-芴(8a - g,12a - e)。根据芴结构,在单或双缩合产物,OHCFcCH芴(11d,e)或芴CHFcCH芴和芴CHRcCH芴(9a – c,10a – c)。化合物8中的分子内电荷转移(ICT)导致降低了CH double芴双键周围的旋转势垒,并易于在溶液中进行E-Z异构化。循环伏安法(CV)实验显示FcCH芴的可逆单电子氧化(8)产生阳离子,两个可逆单电子还原波产生自由基阴离子和二价阴离子(对于8a – e),它们合并成两个-电子还原波8f – h。ICT还表现在8 – 12的电子吸收光谱中发现,和ICT的能量(以及在CV还原电位)来显示极好的相关性(ř ≥0.99)用哈米特型取代基常数(σ p - )的芴基部分。化合物8