IUPAC > Gold Book > alphabetical index > D > Dimroth–Reichardt E T parameter


Dimroth–Reichardt E T parameter

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. E T, called E T 30 by its originators, is given by:
E T = 2.859 × 10 −3 ν = 2.859 × 10 4 λ −1
where E T is in kcal mol −1, ν is in cm −1 and λ is in nm. The so-called normalized E T N scale is defined as:
E T N = E T solvent − E T Si Me 4 E T water − E T Si Me 4 = E T solvent − 30.7 32.4
PAC, 1994, 66, 1077 (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1106
Interactive Link Maps
First LevelSecond LevelThird Level
Cite as:
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term: doi:10.1351/goldbook.D01746.
Original PDF version: http://www.iupac.org/goldbook/D01746.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.
Current PDF version | Version for print | History of this term