Substituent effects on the charge-transfer band shifts in 9,10-dihydro-9,10-o-benzenoanthracene-1,4-diones : further confirmation of the charge-transfer transition for a symmetry-forbidden charge-transfer interaction

Abstract

A series of 9,10-dihydro-9,10 -o-benzenoanthracene-1,4-diones has been prepared; the substituent effects on the charge-transfer band shifts of these compounds strongly support our argument for a ‘charge-transfer transition for a symmetry-forbidden charge-transfer interaction’.