Recently, much attention has been focused on the character- istic properties and reactivities of hypervalent compounds having 3-center of 4-electron bond.1 However, little is known about the photoinduced electron transfer reaction of these compounds. We have previously reported the formation of charge transfer (CT)- complex between tetraazathiapentalene derivative (1a) bearing hypervalent sulfur and tetracyanoquinodimethane (TCNQ), where 1a serves ...