一种具有长寿命三线态的锌卟啉-苝酰亚胺超分子的光物理过程

摘要

A new porphyrin-perylene supramolecule, TPPZn-BPHPDI, was obtained by axial coordination of N-pyridyl-N-(1-hexyl)heptylperylene-3,4,9,10-tetracarboximides(BPHPDI) to the zinc ion center of porphy-rin metallacycle( TPPZn) . The supramolecular system was confirmed by 1 H NMR and 1 H-1 H COSY spectra. The fluorescence titration experiments show that the equilibrium constant of the coordination reaction is 5.32í104 L/mol. The analysis of transient nanosecond fluorescence spectra and transient absorption spectra indicates that a long-lived perylene triplet state(101μs) can form via triplet-triplet energy transfer from the porphyrin to the perylene moiety. Moreover, all above photophysical processes are shown very clearly by means of the ener-gy-level diagram in the paper.%通过吡啶基与金属锌卟啉的配位作用，合成了一种新型卟啉-苝酰亚胺超分子配合( TPPZn-BPHPDI)，通过核磁共振氢谱确认了超分子体系的形成.采用荧光滴定方法测得锌卟啉与苝酰亚胺配位作用的平衡常数为5.32×104 L/mol.纳秒瞬态荧光光谱和瞬态吸收光谱显示，超分子体系内存在着从卟啉三线态向苝酰亚胺三线态的能量传递过程，产生了寿命长达101μs的苝酰亚胺三线态分子.