Photoinduced charge-separation using 10-methylacridinium ion loaded in zeolite Y as a photocatalyst with negligible back electron transfer across the zeolite-solution interface

Photoinduced electron transfer from Fe²⁺ loaded in zeolite Y to the singlet excited state of 10-methylacridinium ion in the zeolite occurs to give the acridinyl radical which reduces 7,7,8,8-tetracyanoquinodimethane in acetonitrile solution to yield the radical anion; the back electron transfer from the radical anion to Fe³⁺ across the zeolite-solution interface is shown to be negligibly slow.