caa a22 4500 46799188X CHVBK 20180323112546.0 cr unu---uuuuu 170328e19901201xx s 000 0 eng 10.1007/BF00473960 doi (NATIONALLICENCE)springer-10.1007/BF00473960 Spectral-luminescence and acid-base properties of 4,7-diaminocoumarins [Elektronische Daten] [L. Karandashova, M. KirpichËnok, D. Yufit, Yu. Struchkov, I. Grandberg] The absorption and luminescence spectra of a series of 4,7-diaminocoumarins have been investigated in ethanol and acetonitrile solution. The pka I and pka II values for several of the compounds have been measured. It has been found that the site of primary protonation is the nitrogen atom in the 7-position, and that the second protonation reaction occurs at the lactone oxygen atom. The effects of steric and electronic factors on the spectral-luminescence and acid-base characteristics of these compounds are discussed. Plenum Publishing Corporation, 1991 Karandashova L. K. A. Timiryazev Agricultural Academy, Moscow aut KirpichËnok M. K. A. Timiryazev Agricultural Academy, Moscow aut Yufit D. K. A. Timiryazev Agricultural Academy, Moscow aut Struchkov Yu K. A. Timiryazev Agricultural Academy, Moscow aut Grandberg I. K. A. Timiryazev Agricultural Academy, Moscow aut Chemistry of Heterocyclic Compounds Kluwer Academic Publishers-Plenum Publishers 26/12(1990-12-01), 1338-1345 0009-3122 26:12<1338 1990 26 10593 https://doi.org/10.1007/BF00473960 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00473960 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Karandashova L. K. A. Timiryazev Agricultural Academy, Moscow aut NATIONALLICENCE 700 1- KirpichËnok M. K. A. Timiryazev Agricultural Academy, Moscow aut NATIONALLICENCE 700 1- Yufit D. K. A. Timiryazev Agricultural Academy, Moscow aut NATIONALLICENCE 700 1- Struchkov Yu K. A. Timiryazev Agricultural Academy, Moscow aut NATIONALLICENCE 700 1- Grandberg I. K. A. Timiryazev Agricultural Academy, Moscow aut NATIONALLICENCE 773 0- Chemistry of Heterocyclic Compounds Kluwer Academic Publishers-Plenum Publishers 26/12(1990-12-01), 1338-1345 0009-3122 26:12<1338 1990 26 10593 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer