INTRAMOLECULAR SUBSTITUTIONS OF SQUARE-PLANAR RHODIUM(I) CATIONIC COMPLEXES OF CIS-DICARBONYL NITROGEN COORDINATED TRIDENTATE

Four kinds of square planar cis-dicarbonyl-N, N-bis(1-pyridylethyl)-p- substituted-phenylamino rhodium(I) are reported. The changes of their structures were analyzed by XPS, IR and NMR spectroscopy. The results show that the weak N-->Rh coordinated bond can replace very soon the s trong Rh-C pi back donation bond to form tris-nitrogen coordinated com plexes due to the steric effect when the temperature is over 50 degree s C. This reaction is reversible. The his-nitrogen coordinated structu re of the complex recovered when put under the atmosphere of CO.