Abstract

The proton spin-lattice relaxation behaviour of solid chloro-tetrakis(ethylene)iridium(I) has been investigated liquid nitrogen and room temperature. The results can be explained by 180°-flip reorientations about the metal axes. The activation energy determining the reorientation of the axial ethylene ligand is 1.6 kcal/mol and the one of the equatorial ethylene ligands is 5.3 kcal/mol.

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