The influences of central Ga atom and peripherally substituted F atoms on fluorescence properties of Corrole
Abstract
The fluorescence properties of four kinds of corroles are investigated by steady-state and transient spectroscopy, which were influenced by the insertion of gallium (Ga) atom into Corrole rings and the increasing of the number of peripherally substituted fluorine atom (F). The steady-state absorption and fluorescence spectra show that the insertion of Ga atom can make the B and Q bands absorption of Corrole stronger while the increasing of peripherally substituented F atom weakens B and Q bands absorption. The insertion of Ga atom into corrole macrocyclic can greatly improve fluorescence quantum yield, and the same effect has been observed by increasing the number of the peripherally substituted F. The transient spectra show that the insertion of Ga atom can lead to shorter fluorescence lifetime, while the increasing of peripherally substituted F atom results in longer fluorescence lifetime. Therefore, the insertion of Ga atom into corrole macrocyclic can induce higher a 10 times larger radiative transition rate. On the other hand, the increasing of peripherally substituted F atom results in a slight increasing in radiative transition rate.
