IR spectroscopy as a source of data on bond strengths

Equations for the calculation of CO bond strengths of different ketones and aldehydes from the corresponding stretching frequencies ν(CO) were derived. Using the proposed equations, the strengths of CO bonds of 25 ketones and 12 conjugated aldehydes, as well as CC bonds of 13 hydrocarbons and 7 conjugated aldehydes were estimated for the first time. Linear correlations of CC and CO bond strengths with the bond lengths were established, and the equations permitting the estimation of the double bond strengths and lengths with acceptable accuracy were obtained. Also, the strength of central CC bond of stilbene was calculated for the first time. The uncertainty of the strengths of double bonds obtained may be regarded as accurate ±10-15 kJ/mol.