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利用稳态和瞬态光谱技术研究了人工组装锌卟啉(ZnP)-苯桥(BB)-铁卟啉(Fe(Cl)P)超分子体系中给体三线态到受体的能量传递及其机理。结果表明体系中存在着由给体ZnP三线态向受体Fe(Cl)P的超快能量传递过程,在室温和低温下通过激发给体ZnP,其单线态的激发能经由系间窜越过程使其三线态布居,在受体Fe(Cl)P存在的情况下,位于给体三线态的激发能经由桥联分子B传递到受体Fe(Cl)P,室温下传递速率为7.2×105s-1。由于体系中给体到受体之间的空间距离约为2.5nm,由给体-受体直接耦合引起的传递机理可以排除,由桥联分子媒介的超交换机理是该能量传递过程的主要物理机理。
The steady-state and transient spectroscopy techniques were used to study the energy transfer from the donor triplets to the acceptors in the assembled zinc (ZnP) -benzene bridge (BB) -ferroporphyrin (Fe (Cl) P) supramolecular system Its mechanism The results show that there exists an ultrafast energy transfer from donor ZnP triplet to acceptor Fe (Cl) P in the system. The excitation energy of ZnP is excited by the donor ZnP at room temperature and low temperature, In the presence of the acceptor Fe (Cl) P, the excitation energy located in the donor triplet state is transferred to the acceptor Fe (Cl) P through the bridged molecule B. The transfer rate at room temperature is 7.2 × 105s-1. Since the distance between donor and acceptor in the system is about 2.5 nm, the transport mechanism caused by direct donor-acceptor coupling can be eliminated. The mechanism of the super-exchange by the bridging molecular medium is the main physics of the energy transfer process mechanism.