
%0 Journal Article
%A Renfrew, RW 
%A Osvath, P 
%A Weatherburn, DC 
%T Kinetic studies on the substitution reactions of (Pyridine-2-carbaldehyde 2'-pyridylhydrazone)nickel(II). A study of stacking interactions in outer-sphere complexes
%J Australian Journal of Chemistry
%D 1980/01/01
%V 33
%N 1
%P 45-55
%K 
%R https://doi.org/10.1071/CH9800045
%U https://www.publish.csiro.au/paper/CH9800045 
%X Kinetics of the formation reactions of the mono and bis complexes of pyridine-2-carbaldehyde 2'-pyridylhydrazone (paphy) with nickel((II), the mono complex of 6-methylpyridine-2-carbaldehyde2'-pyridylhydrazone (mpaphy) with nickel(II), and of the ternary complexes of Ni(paphy)2+ with terpy, bpy, phen and pada and Ni(paphy)2+ and Ni(phen)2+ with mpaphy have been studied inaqueous solution at 25&#176;C and ionic strength 0.1 mol dm-3 (NaNO3). The rates of the formationreactions of the mono complexes are slower than expected on the basis of the usual water-loss mechanism, and ring closure probably contributes to the observed rates. The formation of the bisand ternary complexes is usually more rapid than predicted by the water-loss mechanism. The enhanced rates are attributed to large outer-sphere association constants due to 'stacking' interactions between the incoming and bound ligands. 
