Dyads of the hypsochromically absorbing energy donor benzoperylenetriscarboximide and the more bathochromically absorbing perylenebiscarboximide with various spacers were synthesized by means of the Sonogashira reaction where the transition moments of the donor and the acceptor are orthogonal causing zero for the geometry factor of κ for the simple p-phenylene spacer. Exciton interactions were extinguished; however, the energy transfer by RET (resonance energy transfer) proceeded unaltered efficiently in contrast to the theory where vibronic effects were made responsible therefore. A lateral shift of donor and acceptor by means of a disubstituted naphthalene as the spacer was of no influence. The replacement of the naphthalene by the more electron rich pyrene caused a switch from RET to a photo-induced single electron transfer (SET). RET as a very fast feeder allowed the suppression the formation of triplets of the donor and subsequent the generation of singlet oxygen and allowed to protect the dyad against photochemical degradation. Finally, the influence of the distance between donor and acceptor was studied.

中文翻译：

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从 FRET 到 SET 再到光化学的平衡

通过 Sonogashira 反应合成了深吸色能量供体苯并苝三甲酰亚胺和具有各种间隔物的更具红移吸收能力的苝双甲酰亚胺的二元组，其中供体和受体的跃迁矩是正交的，导致简单p的κ的几何因子为零-亚苯基间隔物。激子相互作用消失了；然而，与因此产生振动效应的理论相反，通过 RET（共振能量转移）进行的能量转移没有有效地改变。通过二取代萘作为间隔物的供体和受体的横向移动没有影响。用更富电子的芘代替萘导致从 RET 转换为光诱导单电子转移 (SET)。RET 作为一种非常快速的进料器，可以抑制供体三联体的形成和随后单线态氧的产生，并保护双联体免受光化学降解。最后，研究了供体和受体之间距离的影响。