Warning (2): get_headers(): https:// wrapper is disabled in the server configuration by allow_url_fopen=0 [APP/Controller/TermsController.php, line 315]
Warning (2): get_headers() [<a href='http://php.net/function.get-headers'>function.get-headers</a>]: This function may only be used against URLs [APP/Controller/TermsController.php, line 315]
IUPAC - bond length (BT07003)

bond length

The distance between atomic centers involved in a @CT07009@. The notion of bond length is defined differently in various experimental methods of determination of molecular geometry; this leads to small (usually \(0.01-0.02\ \mathring{\text{A}}\)) differences in bond lengths obtained by different techniques. For example, in gas-phase electron-@D01711@ 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 @S05848@, 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 @B00705@ (the Pauling's @B00707@).
PAC, 1999, 71, 1919. (Glossary of terms used in theoretical organic chemistry) on page 1927 [Terms] [Paper]