Preferred Label : bond length;
IUPAC definition : The distance between atomic centers involved in a chemical bond. The notion of bond
length is defined differently in various experimental methods of determination of
molecular geometry; this leads to small (usually 0.01-0.02 Å) differences in bond
lengths obtained by different techniques. For example, in gas-phase electron-diffraction
experiments, the bond length is the interatomic distance averaged over all occupied
vibrational states at a given temperature. In an X-ray crystal structural method,
the bond length is associated with the distance between the centroids of electron
densities around the nuclei. In gas-phase microwave spectroscopy, the bond length
is an effective interatomic distance derived from measurements on a number of isotopic
molecules, etc. A number of empirical relationships between bond lengths and bond
orders in polyatomic molecules were suggested, see, for example, fractional bond number
(the Pauling's bond order).;
Origin ID : BT07003;
See also
The distance between atomic centers involved in a chemical bond. The notion of bond
length is defined differently in various experimental methods of determination of
molecular geometry; this leads to small (usually 0.01-0.02 Å) differences in bond
lengths obtained by different techniques. For example, in gas-phase electron-diffraction
experiments, the bond length is the interatomic distance averaged over all occupied
vibrational states at a given temperature. In an X-ray crystal structural method,
the bond length is associated with the distance between the centroids of electron
densities around the nuclei. In gas-phase microwave spectroscopy, the bond length
is an effective interatomic distance derived from measurements on a number of isotopic
molecules, etc. A number of empirical relationships between bond lengths and bond
orders in polyatomic molecules were suggested, see, for example, fractional bond number
(the Pauling's bond order).
