Novel one-pot synthesis of 5-alkenyl-15-alkynylporphyrins and their derivatisation to a butadiyne-linked benzoporphyrin dimer
作者:Hiroko Yamada、Kayo Kushibe、Tetsuo Okujima、Hidemitsu Uno、Noboru Ono
DOI:10.1039/b513848e
日期:——
5-Alkenyl-15-alkynylporphyrins have been obtained unexpectedly by [2 + 2] acid-catalyzed condensation of dipyrrylmethane and TMS propynal in addition to 5,15-dialkynylporphyrin, and the unsymmetrical porphyrin can be converted to a butadiyne-linked dimer by selective desilylation of the alkynyl TMS.
Different arrangements of guestinside the cyclic bis-porphyrin hosts are investigated by using UV/Vis, ESI-MS, and 1H NMR spectroscopy, along with X-ray structure determination of the host–guest complexes. Moreover, strong binding of guests within the cyclic bis-porphyrin hosts support the robust nature of the host–guest assemblies in solution. Such preferential binding of the bis-porphyrinic cavity
The synthesis and excited-state dynamics are described for fixed-distance porphyrin–oxochlorin–pyromellitdimide triads (P–C–Im) and related reference compounds. In zinc-oxochlorin–pyromellitdimide (ZnP–Im), the 1(ZnC)* is quenched by the attached Im throughintramolecular charge separation (CS) in benzene, THF, and DMF, while the 1(H2C)* in the corresponding free base is not significantly quenched
描述了固定距离卟啉-氧代二氯苯-均苯四甲酰亚胺三元组 (P-C-Im) 和相关参考化合物的合成和激发态动力学。在锌氧氯 - 均苯四甲酰亚胺 (ZnP-Im) 中,1(ZnC)* 在苯、THF 和 DMF 中通过分子内电荷分离 (CS) 被附着的 Im 猝灭,而相应游离态中的 1(H2C)*即使在极性 DMF 中,碱也不会被 Im 显着淬灭。在稳态荧光发射光谱中,通常只观察到 1(C)* 的发射,表明分子内单线态-单线态激发能量从 P 到 C 的有效转移。其中,1(H2C) 的荧光强度* 在极性 DMF 溶液中,ZnP–H2C 和 ZnP–H2C–Im 显着减少,这归因于产生 (ZnP)+–(H2C)−–Im 和 (ZnP)+–(H2C)− 的分子内 CS,分别。(ZnP)+–(H2C)−–Im 离子对清楚地显示,通过皮秒吸收光谱,将被转化为次级的、寿命更长的电荷分离...
A Stepwise Electron-Transfer Relay Mimicking the Primary Charge Separation in Bacterial Photosynthetic Reaction Center
ZC. ZC-HP-I undergoes a stepwise electron-transferrelay: sup 1}(ZC)sup *}-HP-I yields} (ZC)sup +}-(HP)sup -}-I yields} (ZC)sup +}-HP-(I)sup -} with overall quantum yields of O.70 and O.07 in THF and DMF, respectively. In ZC-ZP-I, a pre-formed equilibrium between sup 1}(ZC)sup *}-ZP-I and (ZC)sup +}-(ZP)sup -}-I is followed by a rapid charge-shift reaction to provide a secondary ion-pair
Zinc complex of 5,10-bis(2-hydroxynaphthyl)octaethylporphyrin was prepared by coupling tripyrrole and monopyrrole derivatives in the presence of 2-hydroxynaphthaldehyde. The chiral trans isomer and di(benzyl ether) derivative derived therefrom were successfully resolved into enantiomers by means of HPLC.