3070 Inorganic Chemistry, Vol. 15, No. 12, 1976
Stephan S. hied and Henry Taube Contribution from the Department of Chemistry, Stanford University, Stanford, California 94305
Rates of Substitution in Cis and Trans Ruthenium(I1) Aquotetraammines STEPHAN S. ISIED and HENRY TAUBE* Received October 1, 1975 AIC507864 When KH3 in Ru(NH3)5H2O2+ is replaced by a .rr-acid ligand which is at most a moderately strong u donor, the lability of the coordinated water, as measured by the rate at which isonicotinamide replaces it, is greatly reduced. Certain other ligands, whose characteristics are harder to define, are strongly labilizing. The order of increasing lability for the series tr~ns-[Ru~~(NH3)4L(H20)] is as follows for L: CO = Nz, isn, py, imN = NH3, OH-, CN-, SOs2-, imC. The range in the second-order specific rate covered in this series is
