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The carbon Is, nitrogen Is, and oxygen l s binding energies of a wide variety of transition-metal carbonyl and nitrosyl compounds are subjected to correlative analysis. The carbon Is and oxygen Is binding energies of the carbonyls are linearly related to the C-0 stretching force constants, and the nitrogen Is and oxygen Is binding energies of the nitrosyls are linearly related to the N-0 stretching force constants. The data indicate that transfer of electron density to the CO and NO groups is accompanied by weakening of the co and N-0 bonds. From the relative binding energy shifts it is calculated that, in back-bonding to CO groups, more charge is transferred to the carbon atoms than to the oxygen atoms, and, in back-bonding to NO groups, similar amounts of charge are transferred to the nitrogen and oxygen atoms.

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