Abstract
The heat of reaction for addition of iodine to the planar complexes RhCl(CO)dppe, Rh(dppen) 2 +, Rh(dppe) 2 + and to the dimer Rh 2Cl 2(CO) 2(dppm) 2 has been obtained by a calorimetric method. Iodine forms stronger RhI bonds with RhCl(CO)dppe than with the bichelate complexes. The presence of metal-metal interaction in the iodine addition compound of Rh 2Cl 2(CO) 2(dppm) 2 makes a significant contribution to the enthalpy change for the oxidative addition. The stereochemistry of the complexes are discussed on the basis of IR and 31P NMR spectra.
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