Accession Number : ADA186740

Title :   Spectral Locations of Low-Energy Electronic Transitions in Some Fluorene Derivatives.

Descriptive Note : Interim technical rept. Sep 85-Sep 86,

Corporate Author : NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA

Personal Author(s) : Pavlopoulos, Theodore G

PDF Url : ADA186740

Report Date : Sep 1986

Pagination or Media Count : 18

Abstract : The low energy singlet-singlet(s-s) and triplet-triplet (t-t) absorption spectra of fluorene and 2-amino fluorene were measured. Alos, the spectral locations of low-energy s-s and t-t intensity maxima of 2-methoxy, 2-hydroxy, 2,7-diamino, and 2-dimethylamino fluorene were recorded. When expressed in wavenumbers (energy) and within measurement accuracy, the following holds for the 2-position substituted fluorene: (a) the red shift caused by a certain substituent is about the same in both (singlet and triplet) manifolds; (b) the energy difference between s-s and t-t absorption maxima in fluorene as well as in all the substituted compounds is about the same and (c) the spectral red shifts observed in fluorene in the singlet and triplet manifold due to substitution by auxochromic groups can probably be used in fair approximation to estimate anticipated red shifts in other chromophores. For 2,7-diamino fluorene; p-terphenyl, p,p'diamino, p,p-diethylamino terphenyl, p-quaterphenyl; p,p'-diamino, p,p'diethylamino quaterphenyl, spectral relations (a) to (c) also hold rather well. Keywords: Reprints; Excited state spectroscopy; Triplet triplet absorption.

Descriptors :   *ABSORPTION SPECTRA, *FLUORENES, ACCURACY, CHROMOPHORES, ELECTRON TRANSITIONS, LOW ENERGY, MEASUREMENT, POSITION(LOCATION), RED(COLOR), REPRINTS, SHIFTING, SPECTRA, SPECTROSCOPY, SUBSTITUTES

Subject Categories : Atomic and Molecular Physics and Spectroscopy
      Organic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE