isomerism
n . 异性
异性
isomerism n 1 :
the state of being an isomer ;
the complex of chemical and physical phenomena characteristic of isomers Isomerism \
I *
som "
er *
ism \,
n . (
Chem .)
The state ,
quality ,
or relation ,
of two or more isomeric substances .
[
1913 Webster ]
{
Physical isomerism } (
Chem .),
a former term for {
optical isomerism }.
{
optical isomerism } (
Chem .),
the condition or relation of certain (
isomeric )
substances ,
which ,
while chemically identical (
in that they have the same composition ,
the same molecular weights ,
and the same ultimate constitution ),
are yet physically different ,
as in their action on polarized light ,
as dextro -
and l [
ae ]
vo -
tartaric acids ,
or the sugars galactose and glucose .
In such compounds there is usually at least one unsymmetrical carbon atom and typically more than one .
See {
Unsymmetrical }.
[
1913 Webster PJC ]
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