Cyanobuta-1,3-dienes as Novel Electron Acceptors for Photoactive Multicomponent Systems
作者:Francesca Tancini、Filippo Monti、Kara Howes、Abdelhalim Belbakra、Andrea Listorti、W. Bernd Schweizer、Philippe Reutenauer、José-Lorenzo Alonso-Gómez、Claudio Chiorboli、Lorenz M. Urner、Jean-Paul Gisselbrecht、Corinne Boudon、Nicola Armaroli、François Diederich
DOI:10.1002/chem.201303284
日期:2014.1.3
linked to one or two anilino donor‐substituted pentacyano‐ (PCBD) or tetracyanobuta‐1,3‐dienes (TCBD), with and without an interchromophoric bridging spacer (S), are reported: ZnP‐S‐PCBD (1), ZnP‐S‐TCBD (2), ZnP‐TCBD (3), ZnP‐(S‐PCBD)2 (4), and ZnP‐(S‐TCBD)2 (5). By means of steady‐state and time‐resolved absorption and luminescence spectroscopy (RT and 77 K), photoinduced intramolecular energy and electron
五个具有Zn II卟啉(ZnP)的多组分系统的合成,电化学和光物理性质,它们与一个或两个苯胺基供体取代的戊酰基(PCBD)或四氰基ob-1,3-二烯(TCBD)连接,有或没有报告了发色桥联间隔基(S):ZnP‐S‐PCBD(1),ZnP‐S‐TCBD(2),ZnP‐TCBD(3),ZnP‐(S‐PCBD)2(4)和ZnP‐ (S‐TCBD)2(5)。通过稳态和时间分辨的吸收和发光光谱(RT和77 K),在卟啉单元激发后,证明了光诱导的分子内能量和电子转移过程。在配备有最强的受体PCBD和间隔(系统1,4),没有电子转移的证据在甲苯中的发现,暗示ZNP→PCBD能量转移,随后通过超快(<10个PS)的PCBD部分的固有失活。与较弱的受主TCBD(类似的系统2,5),光诱导电子转移在苄腈发生时,产生电荷分离的(CS)的状态持续2.3微秒。考虑到用于电荷重组的高吉布斯自由能(ΔGCR = -1.39