Abstract
In the course of investigating the acid/base properties and possible catalysis roles of several metal carbonyl hydrides, we have prepared the deuteride complexes DM(CO)/sub 4//sup -/ of the iron triad (M = Fe, Ru, or Os) as the PPN/sup +/ salts (PPN/sup +/ = bis(triphenylphosphine)iminium). Comparison of the infrared spectra of these species to the spectra of the hydride analogues (PPN)(HMCO)/sub 4/) demonstrates considerable isotope effects between the metal-hydrogen and carbon oxygen stretching vibrations. Although similar effects have been noted previously in certain other metal carbonyl hydride complexes, the present observations add emphasis to the necessity of considering such resonance interaction in force field calculations based on the vibrational spectra.
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