Kensaku Kamon

Formation and crystal structure of the chiral charge-transfer complex with axially chiral 1,1′-bis-2-naphthol derivatives and tetracyanobenzene

By using an axially chiral 6,6′-disubstituted-1,1′-bis-2-naphthol as the electron donor, we successfully formed chiral charge-transfer (CT) complexes with 1,2,4,5-tetracyanobenzene (TCNB) and examined their crystal structures.

Complexation behaviour of a CT complex composed of 9,10-bis(3,5-dihydroxyphenyl)anthracene and viologen derivatives

A chiral charge-transfer (CT) complex was formed using achiral 9,10-bis(3,5-dihydroxyphenyl)anthracene (BDHA) as an electron donor and achiral 1,1′-dimethyl-4,4′-bipyridinium dichloride (MVCl2) as an electron acceptor. This chiral CT complex can include n-alkyl alcohol molecules as guests. On the other hand, when 1,1′-diphenyl-4,4′-bipyridinium dichloride and 1,1′-dibenzyl-4,4′-bipyridinium dichloride were used as electron acceptors, achiral CT complexes without guests were formed. It was found that the chiral crystallisation of the BDHA/MVCl2–CT host system was caused by steric and electric intermolecular interactions between host component molecules BDHA and MVCl2 during crystallisation.