Structure-Property Relationship in Bispyrrolizidine Photochromic Compounds Derived from Indolo[4,5-e]- and -[7,6-g]indoles

摘要

The spirocyclic compounds bis[2',3'-bis(methoxycarbonyl)-5',6',6'-trimethylspirofluoren-9,4'-(1'-aza-2'-cyclopentene)][1',5'-a]indolino[4,5-e]indoline and bis[2',3'-bis(methoxycarbonyl)-5',6',6'-trimethylspiro-fluoren-9,4'-(1'-aza-2'-cyclopentene)][1',5'-a]indolino[7,6-g]indoline exhibit photochromic properties with various half-lifes.The AM1 method was used to correlate the structural and electronic properties,on the one hand,and photochromic properties,on the other,and to explain reasons for the difference in the photochro-mism of the two compounds.