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Über die Wirkung von Auxochromen in Flavyliumsalzen, I. 7‐Hydroxy‐flavyliumsalze
Author(s) -
Kokkinos Konstantinos,
Wizinger Robert
Publication year - 1973
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.19730560316
Subject(s) - bathochromic shift , chemistry , series (stratigraphy) , convergence (economics) , maxima , art history , optics , physics , art , paleontology , performance art , economics , fluorescence , biology , economic growth
7‐Hydroxy‐flavylium salts absorb at longer wave lengths than the corresponding flavylium salts, yet auxochromes in 4′‐position have a less bathochromic effect in the 7‐hydroxy‐flavylium series than in the flavylium series. As a result the absorption maxima converge. 4′‐Dimethylamino derivatives show a convergence of 22 nm.