Kinetics of water exchange between solvent and aquobipyridylnickel(II

2321 Table VII. A Comparison of Nucleophilic Reactivity a t Divalent Sulfur, sp3 Carbon, and Platinum(I1) Values of 103kz, M-' sec-1 for nucl ~~~~

Subst at SaOe2(eq 12)" ~~

CzHsSCsH& (CsHdsP CN-

soszsz03'-

~

Subst at sp3 carbon (eq Subst at Pt21)b (11) (eq 22)b

It is of interest t o compare reactivity at the bridge sulfur in trithionate with that found for substitution at sp3 carbon in methyl iodide (eq 21) and at Pt(I1) in trans-Pt(py)Klz (eq 22).27 Rate data for nucleophiles

~~

740 28 7.1 0.5 0.02-0.003