SOLVENT SUBSTRATE EFFECTS ON THE MICELLE-CATALYZED AQUATION REACTIONSOF SOME IRON(II) PHENANTHROLINE COMPLEXES, I - INFLUENCE OF WATER ANDACID ON THE AQUATION OF FE(PH(2)PHEN)(3)(2+) IN ACETONE/

The effects of a substrate additive, H+ and solvents (water and aceton e), on the micelle-catalyzed aquation of tris-(4,7-diphenyl-1,10-phena nthroline)iron(II), Fe(Ph(2)Phen)(3)(2+), have been investigated using (#)Triton X-100 micelles. The k(o) vs.[TX-100] profiles at fixed [H2O ] are structured, exhibiting maxims. Catalytic factors of 46.6 - 171.7 are observed for 5.56 x 10(-2) less than or equal to [H2O] 55.60 x 10 (-2) mol dm(-3) On the other hand, at fixed [H+], the k(o) vs. [TX-100 ] exhibit broad maxima. The aquation reaction is inhibited by H+ and c atalytic factors decrease rapidly and exponentially from 422.5 to 20.9 for 0.20x10(-3) less than or equal to [H+] less than or equal to 2.00 x10(-3) mol dm(-3). The aquation is found to be faster (ca. 160-1200 f old) in acetone than in the aqueous medium depending on the added [H2O ]. These observations are rationalized on the basis of a proposed modi fied lamellar structure for the Triton X-100 (TX-100) micelles in whic h direct substitution of water molecules into the coordination sphere of the complex occurs.