Hence, although some dir donation appears to be necessary for the formation of [Ir(NH3)3NH]1 23 4+ from [Ir(NH3)=,N3]2+, extensive electron transfer leads to loss of nitrene-like properties of the resulting ligand. We propose the name "coordinated nitrene" to describe the NH ligand in [Ir(NH3)6NH]3+ as a means of distinguishing compounds of this type from the formally similar alkyl-and arylimido and nitrido ligands of [Re-{P(CH3)2C6H5j2CI3NR) and [Re{P(CH3)2C6H3}3CI2N] which show very different chemical behavior.Acknowledgment. The authors would like to thank Dr. V. G. Myers, whose doctoral thesis provided the basis for this work, and Mr. T. R. Weaver for useful discussion. The iridium trichloride was generously loaned to us by the Matthey Bishop Co. This research was supported by a National Institutes of Health Predoctoral Research Fellowship to J. W. M. and by a National Science Foundation grant.(41) J. Chatt and B. T. Fteaton, ibid., 705 (1971).

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