Preparation and structure of acenaphthylene-1,2-diyldi(9-acridine) derivatives with a long C=C bond

Due to purely steric effects of acridine units, acenaphthylene-1,2-diyldi(9-acridine) has a long C=C bond [1.3789(19) angstrom] while maintaining its sp(2) hybridized nature and bond order.