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Spektroskopische Untersuchung einiger α,β‐ungesättigter cyclischer Ketone
Author(s) -
Marsh Grace,
Kearns D. R.,
Schaffner K.
Publication year - 1968
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19680510810
Subject(s) - chemistry , phosphorescence , excited state , excitation , ketone , absorption (acoustics) , photochemistry , atomic physics , fluorescence , physics , optics , organic chemistry , quantum mechanics
The results of the spectroscopic investigation of the steroidal enones 1–6 can be summarized as follows: 1. Direct absorption and phosphorescence excitation techniques have been used to locate the 3 ( n ,π*) states, and in each case it has been found to be the second triplet state. 2. The lowest excited state in each case is assigned as 3 (π,π*) state. 3. The diffuseness in the phosphorescence emission from the 3 (π,π*) states is attributed to a large change in the molecular geometry upon excitation (probably to a non‐planar configuration). 4. The diffuseness in the S → T n,π * absorption is correspondingly attributed to interaction between the 3 ( n ,π*) and 3 (π,π*) states. A summary of the energy levels for these compounds is given in Fig. 4.