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isotope effect, steric definition
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A secondary isotope effect attributed to the different vibrational amplitudes of isotopologues. For example, both the mean and mean-square amplitudes of vibrations associated with C-H bonds are greater than those of C-D bonds. The greater effective bulk of molecules containing the former may be manifested by a steric effect on a rate or equilibrium constant .

See also:
isoureas definition
isoselective relationship definition
Ionization Isomers definition
isotope effect, intramolecular definition
Isomer definition
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