Abstract A number of new derivatives of 8-hydroxyquinoline containing both solubilising groups and groups which might sterically hinder chelation have been prepared, viz. 8-hydroxy-7-morpholino-methylquinoline-5-sulphonic acid, 8-hydroxy-7-piperidinomethylquinoline-5-sulphonic acid, 8-hydroxy-2-(3,4-dimethoxyphenyl)-quinoline-4-carboxylic acid, 8-hydroxy-2-n-hexylquinoline-4-carboxylic acid and 8-