In X-ray absorption spectroscopy, this phenomenon adds an additional peak to the L-edge spectrum.
Because this phenomenon is relatively weak for N-heterocyclic carbenes, A.B.P. Lever developed a namesake parameter to characterize their properties. In X-ray absorption spectroscopy, this phenomenon adds an additional peak to the L-edge spectrum. Measurements of this phenomenon are used to calculate the Tolman electronic parameter. This phenomenon drives the concerted oxidative addition of diatomic hydrogen to a metal via a "sigma complex." Cyanides and phosphines are near the top of the spectrochemical series because they strongly engage in this phenomenon. This phenomenon leads to a decrease in the stretching frequency of the C-O bond in carbon monoxide, a fact useful for characterizing metal carbonyl complexes using IR spectroscopy. For 10 points, name this phenomenon in which electrons are donated from an atomic orbital of a metal to an antibonding orbital of a ligand.
Because this phenomenon is relatively weak for N-heterocyclic carbenes, A.B.P. Lever developed a namesake parameter to characterize their properties.
pi backbonding [or pi backdonation]