DYNAMIC BEHAVIOR OF TRANS-DIHALIDE-BISHYDRAZONE-PALLADIUM(II) COMPLEXES

A recent article in this journal dealt with the dynamic behavior of trans-PdCl2(Me2C=NNMePh)2 (I) and trans- PdCl2(Pr MeC=NNMePh)2 (II) and pointed out that (i) in compound I, at low temperature, the two hydrazones are unequivalent as a consequence of the alternating character of the palladium-alkyl interaction with the two ligands; (ii) compound II exists in two isomeric forms, II1 and II2, one of which (II2) reveals unequivalence of the two ligands within the same molecule as I; (iii) a concerted intramolecular exchange mechanism occurring through oscillation of small amplitude about the Pd-N bond, rather than complete rotation of the two ligands about the metal-ligand bonds, is responsible for the fluxionality of I and II2. © 1979, American Chemical Society. All rights reserved.