Quantitative Transduction of Excited-State Energy inFluorophore-Heterofullerene Conjugates
作者:Frank Hauke、Andreas Hirsch、Stefan Atalick、Dirk Guldi
DOI:10.1002/ejoc.200400771
日期:2005.5
absorption measurements. It was found that a common deactivation process of the photoexcited fluorophores takes place, namely, a quanti-tative transduction of singlet excited state, yielding the hetero-fullerene singlet excited state. This reaction pathway leads to the long-lived and highly reactive fullerene triplet state, which forms, in a reaction with molecular oxygen, a cytotoxic oxygen species (i.e. singlet
合成了一系列新的荧光团-杂富勒烯共轭物 10-14——荧光团范围从苯、萘、菲、芴到芘。核磁共振波谱和量子力学计算表明,乙酰基接头的灵活性为发色团之间具有 π-π 堆积相互作用的构象开辟了道路。这导致了两个子系统之间有利的电子通信,并反映在一系列基态和激发态分析中,从荧光到快速瞬态吸收测量。发现发生光激发荧光团的常见失活过程,即单线激发态的定量转导,产生异富勒烯单线激发态。该反应途径导致长寿命且高反应性的富勒烯三重态,其在与分子氧的反应中形成细胞毒性氧物质(即单线态氧)。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)