A measure of the
ionizing power (loosely
polarity) of a solvent, based on the maximum wavenumber of the longest
wavelength electronic absorption band of:
in a given solvent.
, called
by its originators, is given by:
where
is in
,
is in
and
is in
.
The so-called normalized
scale is defined as:
Source:
PAC, 1994, 66, 1077
(Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994))
on page 1106
parameter
