Dynamic Assemblies and Photophysical Changes of Zinc Porphyrin Dimer Regulated by N-Containing Ligands

Zinc porphyrin dimer （1） has been designed and synthesized as a novel host of N-containing ligands. The assembly behavior and photophysical changes of its host-guest complexes were evaluated by IH NMR, fluorescence, and UV-visible titrations, and the processes reveal that the host-guest assembly first creates a stable sandwich complex, then an axial coordination equilibrium appears between the sandwich complex and free ligand. The changes of absorption spectra of the assembly processes rely on the stabilities of the complexes, and fluorescence quenching depends on the axial coordination equilibrium, which indicates that the axial ligation/de-ligation dynamics is indeed a pathway from the excited state to the ground state for metalloporphyrin complexes.

锌卟啉更暗淡(1 ) 作为包含 N ligands 的一位新奇主人被设计了并且综合。它的主人客人建筑群的集会行为和 photophysical 变化被 1H NMR，荧光，和紫外可见的滴定评估，并且这些过程表明主人客人集会首先创造稳定的三明治建筑群，然后，轴的协作平衡出现在三明治之间复杂、免费的 ligand。汇编进程的吸收系列的变化依靠熄灭的建筑群，和荧光的稳定性取决于轴的协作平衡，它确实显示轴的 ligation/de-ligation 动力学是来自激动的状态的一条小径到为 metalloporphyrin 建筑群的扎根的状态。