sigma bond
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sigma bond
[′sig·mə ‚bänd] (physical chemistry)
The chemical bond resulting from the formation of a molecular orbital by the end-on overlap of atomic orbitals.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive
Summary: C-glycopeptidomimetics are formed by the condensation of sugar unit and analogues of amino acid residue which generates a new carbon-carbon
sigma bond. In glycopeptides, this condensation occurs in side chain of amino acid but introduction of isonitrile moiety on N-terminal of amino acid mimic unit can also be a route to produce such compounds.
This is because the crystal structure is solved using the electron density map, and the electrons of the hydrogen atom are mostly between the hydrogen and carbon atoms' nuclei in the
sigma bond. Since the location of the hydrogen atom is dependent on the electron density in X-ray crystallography, the hydrogen seems closer to the carbon than it really is (7).
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