Abstract
The NH stretching frequency and the
electronic spectra of 8 alkyl- and 12 ethoxycarbonyl-dipyrromethenes have been
measured and the results correlated with the electronic and steric effects of
the substituents. It is postulated that there is steric interaction between the
two ethoxycarbonyl groups of 3,3'-diethoxycarbonyl.
4,5,4',5'-tetramethyldipyrromethene. The electronic effect of substituents in
the 4,4'-positions of 3,5,3',5'-tetramethyldipyrromethenes is discussed.
Cited by
13 articles.
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1. Calculation of the Vibrational Spectra of Linear Tetrapyrroles. 2. Resonance Raman Spectra of Hexamethylpyrromethene Monomers;The Journal of Physical Chemistry B;2000-10-04
2. Salt-base equilibrium and fluorescence of 3,4,5,3′,4′,5′-hexamethyl and 4,4′-dicarbethoxy-3,5,3′,5′-tetramethyl dipyrrylmethene hydrochlorides in the presence of triethylamine;Journal of Photochemistry and Photobiology A: Chemistry;1991-02
3. Pyrromethene-BF2 complexes as laser dyes:1.;Heteroatom Chemistry;1990-10
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5. Optical properties of pyrromethene derivatives. Possible excited-state deactivation through proton tunneling;The Journal of Physical Chemistry;1985-09