The chromatography of p'-substituted-p-hydroxyazobenzenes on alumina-impregnated paper

Abstract R f values of p '-substituted- p -hydroxyazobenzenes on paper, glass-fibre “paper”, and these papers impregnated with different amounts of alumina are given. Results indicate that the alumina is primarily responsible for sorption. The effect of the electrical nature of the p '-substituent on sorption is small. Sorption is considered to be a result of hydrogen bonding between oxygen centres in the sorbed molecule and active hydrogen centres on the hydroxylated alumina.