reduction is localised on the tropylium entity. In the electronic absorption spectra two intense bands are observed in the region 400 < λ < 900 nm which undergo strong negative solvatochromic shifts. The origin of the high-energy absorption band is assumed to be an interligand charge-transfer (LL–CT) transition, and the low-energy absorption band is assigned to a donor-acceptor charge-transfer (DA–CT) transition
为了研究非线性光学性质,特别是有机
金属配合物的二次谐波产生 (S
HG),已经合成了许多一般形式 [Mc-Z- ]+ 的偶极单阳离子倍半富瓦烯配合物(Mc =
金属茂基),其中
金属茂基部分Mc 作为电子供体,Tropylium 阳离子
C7H6+ 作为电子受体。供体和受体基团的相互电子影响由连接间隔物 Z 保证,它是一个单键 [Mc = CpFeC5H4 (4a); Mc = CpRuC5H4 (4b)],包含烯烃的不饱和桥 [Z = (E-CHCH)n: n = 1, Mc = CpFeC5H4 (25a), Mc = CpRuC5H4 (25b); n = 2,Mc = CpFeC5H4 (26);n = 3,Mc = CpFeC5H4 (27)],或
噻吩单元 [Z = 2,5-
C4H2S,Mc = CpFeC5H4 (28);Z = 5,5'-(2,2'- )2,Mc =