INTERACTION OF AQUEOUS-SOLUTIONS OF A SURFACE-ACTIVE COPPER(II) COMPLEX WITH SEVERAL COMMON SURFACTANTS

Micellar properties of binary mixed surfactants of a surface active mi xed copper(II) chelate, [Cu(C-12-tmed)(acac)Cl] (where C-12-tmed is N, N,N'-trimethyl-N'-dodecylethylenediamine) with three common surfactant s, viz, sodium dodecyl sulfate (SDS), cetyltrimethylammonium bromide(C TAB), and octaethylene glycol monododecyl ether (C,,Es), were investig ated by surface tensiometry, ESR, and W-visible absorption techniques, The surface tension data were treated with Rubingh's method for mixed micelle formation and Rosen's method for mixed monolayer formation at the aqueous solution/air interface, It was found that in the mixed mi celle there is strong attractive interaction between cationic copper s urfactant and anonic dodecyl sulfate while there is almost ideal mi;mi xing between copper surfactant and CTAB and C12E8. From the ESR and UV -visible studies, a mixed block-type arrangement of head groups is pro posed. (C) 1997 Academic Press.