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Über die Wirkung von Auxochromen in Flavyliumsalzen, II. 5,6‐Benzo‐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.19730560317
Subject(s) - bathochromic shift , chemistry , series (stratigraphy) , optics , physics , fluorescence , biology , paleontology
Analogously to the 7‐hydroxyflavyliumion the 5,6‐benzoflavyliumion affects auxochromes in 4′‐position not as strongly as the flavylium ion. In the flavylium series the dimethyl‐amino group e.g. causes a bathochromic effect of 137 nm; in the 5,6‐benzoflavylium series however the bathochromic effect is only 109 nm. The absorption maxima of both series converge; in the case of the dimethylamino group the convergence amounts to 28 nm.
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