Isomers having the same number of each isotopic atom but differing in their positions.
The term is a contraction of '
isotopic isomer'. Isotopomers can be either constitutional isomers (e.g.
CH2DCH=O
and
CH3CD=O) or isotopic
stereoisomers [e.g. (
R)- and (
S)-
CH3CHDOH
or (
Z)- and (
E)-
CH3CH=CHD].
Source:
PAC, 1994, 66, 1077
(Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994))
on page 1132
PAC, 1996, 68, 2193
(Basic terminology of stereochemistry (IUPAC Recommendations 1996))
on page 2211