Incorporation of Stable Organic Radicals of the Tris(2,4,6-trichlorophenyl)methyl Radical Series to Pyrrole Units as Models for Semiconducting Polymers with High Spin Multiplicity. 1. [2,6-Dichloro-4-[2,5-bis(5-methyl-2-thienyl)- 1-pyrrolyl]phenyl]bis(2,4,6-trichlorophenyl)methyl Radical as a Precursor of a Disjoint Heterospin Diradical with a Triplet or a Nearly Degenerate Singlet−Triplet Ground State
作者:V. M. Domingo、X. Burdons、E. Brillas、J. Carilla、J. Rius、X. Torrelles、L. Juliá
DOI:10.1021/jo000217b
日期:2000.10.1
6-dichlorophenyl)bis(2, 4,6-trichlorophenyl)methyl radical and acetylacetone or 1, 4-bis(5-methyl-2-thienyl)-1,4-butanedione yield [2,6-dichloro-4-(2, 5-dimethyl-1-pyrrolyl)phenyl]bis(2,4,6-trichlorophenyl)methyl radical (3(*)()) and [2,6-dichloro-4-[2, 5-bis(5-methyl-2-thienyl)-1-pyrrolyl]phenyl]bis(2,4, 6-trichlorophenyl)methyl radical (4(*)()), respectively. EPR studies of both radicals 3(*)() and 4(*)() in CH(2)Cl(2)
(4-氨基-2,6-二氯苯基)双(2,4,6-三氯苯基)甲基与乙酰丙酮或1,4-双(5-甲基-2-噻吩基)-1,4-丁二酮之间的缩合反应产生[2,6-二氯-4-(2,5-二甲基-1-吡咯基)苯基]双(2,4,6-三氯苯基)甲基(3(*)())和[2,6-二氯-4- [2,5-双(5-甲基-2-噻吩基)-1-吡咯基]苯基]双(2,4,6-三氯苯基)甲基(4(*)())。对CH(2)Cl(2)解决方案中的自由基3(*)()和4(*)()的EPR研究表明,弱电子离域作用与六个芳族氢的偶合常数分别为1.25和1.30 G 。通过循环伏安法分析了它们的电化学行为。相对于SSCE,两个自由基均显示出在E度分别为-0.69 V和-0.61 V时可逆的还原过程,在E(p)(a)= 1.10和0.72 V时的阳极峰值电位,相对于SSCE在200 mV s(-)(1)的扫描速率下(nu)是可逆的。自由基3(*)()的X射线分析表明,在2