[2.2]Paracyclophane-4,7,12,15-tetrone, [2.2](1,4)Naphthalenophane-4,7,14,17-tetrone, and 1,4,8,11-Pentacenetetrone Radical Anions − A Comparative ESR Study
作者:Alexander R. Wartini、Jorge Valenzuela、Heinz A. Staab、Franz A. Neugebauer
DOI:10.1002/(sici)1099-0690(199802)1998:2<221::aid-ejoc221>3.0.co;2-y
日期:1998.2
Three types of tetrone radical anions in which two 1,4-benzoquinone units are connected by ethano (1·−, 2·−), [2.2]paracyclophane (3·−, 4·−), and anthracene bridges (5·−, 6·−) have been studied by ESR and ENDOR spectroscopy. The displacement of the unpaired electron over the two π moieties in the [2.2]cyclophane radical anions 1·−−4·− and the marked difference between the first and second reduction
三种类型的四酮自由基阴离子,其中两个 1,4-苯醌单元通过乙醇 (1·-, 2·-)、[2.2] 对环芳烷 (3·-, 4·-) 和蒽桥 (5·-) 连接, 6·-) 已通过 ESR 和 ENDOR 光谱进行了研究。未配对电子在 [2.2] 环芳基阴离子 1·−−4·− 的两个 π 部分上的位移以及第一和第二还原电位之间的显着差异,ΔE = |E20 - E10| ≥ 0.20 V,是两个电泳之间大量分子内电子相互作用的证据。合成 (3) 和抗萘烷 (4) 的类似 ΔE 数据表明,大多数分子内电子相互作用是通过 [2.2] 对环烷桥发生的。当阳离子的络合抑制离子配对时,