A stable C60 derivative bearing an azide functional group has been prepared and used as a building block for the preparation of a fullereneâporphyrin conjugate (FâPâF) by reaction with a Zn(II)âporphyrin bearing two terminal alkyne groups under the copper mediated Huisgen 1,3-dipolar cycloaddition conditions. The electrochemical and photophysical properties of the resulting multicomponent system have been investigated in detail. In benzonitrile, FâPâF undergoes photoinduced electron transfer and the resulting charge separated state is relatively long lived (Ï = 0.48 µs). In contrast, intramolecular energy transfer has been evidenced in toluene, with the generation of the fullerene triplet level upon selective excitation of the porphyrin moiety. In this solvent, a CT emission band is observed in the near-infrared region (λmax = 940 nm) as a consequence of a conformational equilibrium causing, to a minor extent, the formation of intramolecular porphyrinâfullerene tight pairs. This finding is supported by measurements of singlet oxygen sensitization and quenching of the long-lived fullerene centered triplet state in the oxygen free solution.
通过与带有两个末端炔基的 Zn(II)-
卟啉在
铜介导的 Huisgen 1,3-二极环加成条件下发生反应,制备出了带有
叠氮官能团的稳定 C60 衍
生物,并将其用作制备
富勒烯卟啉共轭物(FâPâF)的构件。研究人员对由此产生的多组分体系的电
化学和光物理特性进行了详细研究。在
苯甲腈中,FâPâF 发生光诱导电子转移,所产生的电荷分离状态相对较长(Ï = 0.48 μs)。相比之下,分子内能量转移在
甲苯中得到了证实,
卟啉分子被选择性激发后会产生
富勒烯三
重水平。在这种溶剂中,在近红外区域(δ "max = 940 nm)观察到 CT 发射带,这是构象平衡的结果,在较小程度上导致分子内
卟啉与
富勒烯紧密对的形成。在无氧溶液中对单线态氧的敏化和长寿命
富勒烯中心三重态的淬灭测量结果也证实了这一发现。