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The syntheses and spectra of some nickel(I1) perchlorate and chromium(II1) perchlorate complexes of a series of lactams of .C=O! general formula (H2CIn I oxygen-coordinated complexes.This order is compared to other data on ring size effects served for some fully substituted amides,2 is found to exist between the coordinated lactams. study confirm many of the conclusions drawn in the study of the amide complexes.are described. The ligand field parameters Dq and p are calculated for the octahedral, When R is hydrogen and n = 3, 4, or 5, the spectrochemical order toward nickel ( 11) is When R is methyl, a steric effect, previously obThe data obtained in this L -R -Introduction The donor properties of amides of general formula RC(0)NRz have been extensively studied. Invariably it has been found that oxygen is the principal donor site, and the oxygen is a better donor than is the carbonyl oxygen of acetone. This has been attributed3 to delocalization of the nonbonding electron pair on the nitrogen into a 7i.-molecular orbital involving oxygen, carbon, and nitrogen. The inductive effect of the R substituent in the amides is manifested by the following order of donor strengths toward phenol2: HC(0)-

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The natural oxygen carriers of biological systems are transition metal complexes which are able to bind reversibly to molecular oxygen. While most of these natural complexes (such as the ferrous protoporphyrin group in hemoglobin) (1) tend to be quite intricate, there are a number of synthetic systems whose relative simplicity has led to intensive investigation of their chemical properties. The importance of these model systems and their novel chemistry should be of general interest. This review is not intended to be a thorough and complete one on oxygen adducts. It is designed to provide a general, and in some representative cases, an in-depth study of molecular oxygen adducts of transition metal complexes. Synthesis of the oxygen carrier, chlorocarbonylfns(triphenylphosphine)iridium(I), [IrCl(CO)(Ph3P)2], by Vaska (2) in 1963 has led to intensive investigation of numerous iridium and

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