Substituent effects on absorption and fluorescence spectra of carbostyrils

Synthesis, characterization and biological studies of CoII, NiII, CuII and ZnII complexes of Schiff bases derived from 4-substituted carbostyrils[quinolin2(1H)-ones]

“…Fluorescent heterocycles are also valuable enzyme substrates [18,19]. Carbostyril and its derivatives are used as a good complexing agent for both transition and inner transition metal ions [20][21][22]. In the present investigation an attempt was made in meeting expectations that even transition metal complexes are fairly good biological agents which have good biological and antitumor activity.…”

Structure-property relationships of electroluminescent polythiophenes: role of nitrogen-based heterocycles as side chains

“…The absorption maxima of organic compounds can be predicted by the semiempirical molecular orbital calculations (ZINDO for electronic transition energies) (Fabian et al 1999 obtained from polymer thin film, the reverse order of energy is observed. The energy-based ordering of compounds exactly matches with the trend obtained in band gap for the thiophene structures bearing one nitrogen heterocyclic ring at the side chain (structures 2 to 7).…”

“…This also depends on the applied voltage. Qualitative ordering of polymers on the basis of electroemission pattern (Fabian et al 1999) (on the basis of wavelength/intensity for the compounds) is shown in table 9. The qualitative order of wavelength of electroemission overlaps with the results obtained for photoemission trend.…”

Theoretical investigation of stokes shift of 3,4-diaryl-substituted maleimide fluorophores

“…These structure relation parameters are called Stokes shift, which is defined as the energy difference between the 0-0 transitions in the photoluminescence and absorption spectra. Several papers have been published on the computer simulation and the quantum chemistry calculations in Stokes shift [9][10][11][12][13].…”