Preferred Label : unstable;
IUPAC definition : The opposite of stable, i.e. the chemical species concerned has a higher molar Gibbs
energy than some assumed standard. The term should not be used in place of reactive
or transient, although more reactive or transient species are frequently also more
unstable. (Very unstable chemical species tend to undergo exothermic unimolecular
decompositions. Variations in the structure of the related chemical species of this
kind generally affect the energy of the transition states for these decompositions
less than they affect the stability of the decomposing chemical species. Low stability
may therefore parallel a relatively high rate of unimolecular decomposition.);
Origin ID : U06569;
Automatic exact mappings (from CISMeF team)
- See also
The opposite of stable, i.e. the chemical species concerned has a higher molar Gibbs
energy than some assumed standard. The term should not be used in place of reactive
or transient, although more reactive or transient species are frequently also more
unstable. (Very unstable chemical species tend to undergo exothermic unimolecular
decompositions. Variations in the structure of the related chemical species of this
kind generally affect the energy of the transition states for these decompositions
less than they affect the stability of the decomposing chemical species. Low stability
may therefore parallel a relatively high rate of unimolecular decomposition.)
