the betaine dyes investigated are 2,4,6-triphenyl-n- ( 3,5-diphenyl-4-hydroxyphenyl ) pyiidinium betaine ( i ) , 1-methyl-8-hydroxyquinolinium betaine ( ii ) , 1-methyl-6-hydroxyquinolinium betaine ( iii ) and 2-methyl-5-isoquinolinium betaine ( iv ) , and the organic solvents are ethanol , isopropanol , acetone , dioxan , acetonitrile and pyridine .
C0001962
ethanol
C0022237
isopropanol