El-Khouly Mohamed E
Department of Chemistry, Faculty of Education, Kafr El-Sheikh, Tanta University, Egypt.
Spectrochim Acta A Mol Biomol Spectrosc. 2007 Jul;67(3-4):636-42. doi: 10.1016/j.saa.2006.08.022. Epub 2006 Aug 22.
Photoinduced intermolecular electron transfer process of fullerene (C60) with 9,9-bis(4-triphenylamino)fluorene (BTAF) and 9,9-dimethoxyethyl-2-diphenylaminofluorene (DAF) in toluene and benzonitrile has been investigated by nanosecond laser photolysis technique in the visible/near-IR regions. By the selective excitation of C60 using 532 laser light, it has been proved that the electron transfer takes place from the ground states BTAF and DAF to the triplet excited state of C60 ((3)C60*) by observing the radical anion of C60 and radical cation of BTAF and DAF. It was observed that the electron transfer of BTAF/(3)C60* is more efficient than DAF/(3)C60* reflecting the effect of amine-substitutents of the fluorene moiety on the efficiency of the electron transfer process. On addition of a viologen dication (OV(2+)), the electron of the anion radical of C60 mediates to OV(2+) yielding the OV(+). These results proved that the photosensitized electron-transfer/electron-mediating processes have been confirmed by the transient absorption spectral method.
采用纳秒激光光解技术，在可见光/近红外区域研究了富勒烯（C60）与9,9-双（4-三苯胺基）芴（BTAF）和9,9-二甲氧基乙基-2-二苯胺基芴（DAF）在甲苯和苯腈中的光致分子间电子转移过程。通过用532激光选择性激发C60，通过观察C60的自由基阴离子以及BTAF和DAF的自由基阳离子，证明了电子从基态BTAF和DAF转移到C60的三重激发态（(3)C60*）。观察到BTAF/(3)C60的电子转移比DAF/(3)C60更有效，这反映了芴部分的胺取代基对电子转移过程效率的影响。加入紫精二价阳离子（OV(2+)）后，C60阴离子自由基的电子介导至OV(2+)，生成OV(+)。这些结果证明，通过瞬态吸收光谱法证实了光敏电子转移/电子介导过程。
