Synthesis is described of a series of distance-fixed quinone-linked porphyrins in which electron affinity of the attached quinone is systematically changed. The fluorescence lifetimes of the porphyrin chromophore in these model compounds were shortened due to the intramolecular electron transfer to the attached quinone. The rates of the charge separation between the singlet excited state of the porphyrin and the quinone were determined on the basis of these shortened fluorescence lifetimes and were plotted against the free energy changes associated with the charge separation. Up to ca. 1.54 eV exothermic reaction, the rates of the charge separation were found to still increase.
本研究描述了一系列距离固定的醌连接卟啉的合成过程,其中所连接的醌的电子亲和力发生了系统性变化。由于分子内电子转移到所附的醌上,这些模型化合物中卟啉发色团的荧光寿命缩短了。根据这些缩短的荧光寿命确定了卟啉和醌的单激发态之间的电荷分离率,并绘制了与电荷分离相关的自由能变化曲线。结果发现,在大约 1.54 eV 的放热反应中,电荷分离率仍在增加。
Cyansubstituierte chinone—I
作者:Kurt Wallenfels、D. Hofmann、R. Kern
DOI:10.1016/s0040-4020(01)93878-5
日期:1965.1
Synthesis of Trichlorodimethoxybenzene-Linked Porphyrin-Pyridine Conjugate
The synthesis of a trichlorodimethoxybenzene substituted Zn(II) metalloporphyrin-pyridine conjugate 12 is reported. The structures of the porphyrins were established by MS, 1H NMR and elemental analysis. Protonation of the pyridine moiety leads to a strong reduction of fluorescence intensity of 12.