RATES OF SUSTITUTION OF SOME DIACIDOBIS(ETHYLENDEDIAMINE)IRIDIUM(III) COMPLEXES

The rates of the substitution reactions of the series trans-Ir(en)2X+2 (X = Cl, Br, I) and trans-Ir(en)2LCl+ (L = NO2, I, Br) with various nucleophiles have been studied. The reactions were found not to be complicated by catalysis or stereochemical rearrangements, and all were found to be independent of the nature and concentration of incoming nucleophile. The trans effect of L was studied and found to increase in the series NCS- < Cl- < Br- < NO-2 < I-. The kinetic trans effect was found not to be as pronounced as in the analogous Rh(III) series. © 1969, American Chemical Society. All rights reserved.