Relation between force constant and bond length for carbon—nitrogen bonds

Abstract

Using 25 accurately known bond-stretching force constants and bond lengths for 23 molecules, a relation of the form: F = 37.3 r −5.35 has been obtained for carbon—nitrogen bonds. The root-mean-square deviation between the force constant values reported in the literature and those calculated from the equation above is 4.09 %. Fourteen of the molecules studied have a rotational symmetry axis that coincides with the carbon-to-nitrogen bond. The remaining molecules have lower symmetry. The observed force constant—bond length relationship gives quite satisfactory results for both groups of molecules.