Thermodynamic studies of the addition of N2, C2H4, and alkynes to [Rh(PiPr3)2Cl]2

[Rh((PPr3)-Pr-i)(2)Cl](2) reacts with various small molecules L' to give complexes Rh((PPr3)-Pr-i)(2)ClL'. The enthalpy of this reaction has been determined calorimetrically and/or by equilibrium methods for L' = N-2, C2H4, diphenylacetylene, and 2-butyne. These values, in combination with the previously determined lower limit for the [Rh((PPr3)-Pr-i)(2)Cl](2) bridge strength, afford lower limits of the Rh-L' BDE's; the lower limits are probably only slightly less than the actual BDE's