Acid-base reactions in organic solvents. Behavior of some halogenated derivatives of phenolsulfonephthalein with different classes of organic bases in benzene

Abstract

This paper, t h e secon d in a series co ncernin g t he use of indicator dyes to st udy t he reactio ns of organi c acids a nd bases in o rgan ic sol ven ts, deals wi th haloge n deri vatives o f p he nolsulfo nepht halein. Sp ectroph otom et ric data a rc given for mix t ures of brom ocresol gree n, b romop henol blu e, iodophenol blue, a nd t e trabrom oph enol blue wit h prima ry, secon da ry , a nd ter tia ry aliph atic amin es in benzene; and q ualita t ive data a re tab ulated fo r chlo rophe nol blue, b romochl oroph enol blll e, chlorophenol red , b ro mophe nol red , brom oc resol purple , and b rom othy m ol blu e. Com parisons a re m ad e of t he p henols ulfon eph t hale ins a nd t he brom oph t halein m age n tas. Th e st ru ctura l changes t hat accompa ny t he color p henomena a re discussed . Sugges t ions a re m ad e regard in g t he use of t he indi cators in in ert sol ve nts.