Charge-Transfer Salts of 6,6-Dicyanopentafulvenes: From Topology to Charge Separation in Solution
作者:Aaron D. Finke、Michal Zalibera、Daria Confortin、Anne-Marie Kelterer、Christian Mensing、Sophie Haberland、François Diederich、Georg Gescheidt
DOI:10.1002/chem.201802486
日期:2018.9.12
torsional angles in the solid state. EPR, NMR, and optical spectroscopy, as well as superconducting quantum interference device (SQUID) measurements, reveal that charge‐separation in the crystalline states and in frozen and fluid solutions depends on subtle differences of redox potentials, geometry, and on ion pairing. Whereas 1⋅Cp2Co reveals paramagnetic character in the crystalline state and in solution
具有适合于形成其自由基阴离子的氧化还原电势的6,6-二氰基五叶富烯衍生物和茂金属形成高度持久的供体-受体盐。2,3,4,5-四苯基-6,6-二dicyanofulvene与二茂钴(的电荷转移盐1⋅的Cp 2共)和2,3,4,5-四(三异丙基硅基)-6,6-二dicyanofulvene与十甲基二茂铁(2⋅Fc *)已制备。获得了两种盐的X射线结构,形成了黑版,并在此处进行了讨论。与中性二氰基戊二烯富戊烯相比,茂金属盐中的发色团在固态下的键长和扭转角显示出很大的变化。EPR,NMR和光谱学以及超导量子干涉仪(SQUID)的测量结果表明,结晶态以及冷冻和流体溶液中的电荷分离取决于氧化还原电势,几何形状和离子对的细微差别。而1⋅的Cp 2共同揭示在结晶状态和在溶液中,化合物顺磁性字符2⋅Fc *在顺磁性和反磁性之间显示出微妙的平衡,具体取决于温度和溶剂特性。