Singlet energy transfer in bis(phenylethynyl)phenylene-bridged zinc–free base hybrid diporphyrins
作者:Shigeki Kawabata、Iwao Yamazaki、Yoshinobu Nishimura、Atsuhiro Osuka
DOI:10.1039/a606700j
日期:——
A set of bis(phenylethynyl)phenylene-bridged diporphyrins 1â3
has been prepared by the acid-catalysed double condensation reaction of
bis(4-formylphenylethynyl)benzene 8 and 9, and
3,5-di-tert-butylbenzaldehyde 11 with
bis(3-hexyl-4-methylpyrrol-2-yl)methane 12 or the
Pd0-catalysed coupling reaction of acetylene-substituted
porphyrin 14 with 1,4-diiodobenzene. Intramolecular singlet excitation
energy transfer in Znâfree base hybrid diporphyrins 1â3(ZH)
has been studied by picosecond time-resolved fluorescence spectroscopy.
The determined kEN values are in the order
of 1(ZH) > 2(ZH) â 3(ZH). The energy transfer
mechanism is discussed in terms of varying contribution of through-space
and through-bond interactions.
通过酸催化双(4-甲酰基苯乙炔基)苯 8 和 9 以及 3,5-二叔丁基苯甲醛 11 与双(3-己基-4-甲基吡咯-2-基)甲烷 12 的双缩合反应,或通过钯催化乙炔取代的卟啉 14 与 1,4-二碘苯的偶联反应,制备了一组双(苯乙炔基)苯桥二卟啉 1â3。通过皮秒时间分辨荧光光谱法研究了无锌基杂化二卟啉 1â3(ZH) 分子内单子激发能量的转移。 测定的 kEN 值顺序为 1(ZH) > 2(ZH) â 3(ZH)。研究从通空和通键相互作用的不同贡献角度讨论了能量传递机制。