THE EFFECTS OF ELECTRON-WITHDRAWING GROUPS IN THE MESO-POSITION OF THE POLYMETHINE CHROMOPHORE ON THE ABSORPTION SPECTRA OF INDOHEPTAMETHINECYANINE DYES
DOI:
https://doi.org/10.15407/dopovidi2023.03.089Keywords:
indoheptamethinecyanine dyes, polymethine chromophore, electron-withdrawing substituents, meso-position, nitrogen-containing heterocyclesAbstract
The synthesis and spectral properties of a series of indoheptamethinecyanine dyes with electron-withdrawing groups in the meso-position with rigidly fixed polymethine chromophore have been investigated. The obtained data indicate that the synthesized dyes exhibit high intensity spectral properties that are located in the practically important near-infrared range. The unusual spectral properties of the meso-ethylthio group have been analyzed by DFT-B3LYP methods. The obtained dyes also show notable negative solvatochromism. Additionally, the influence of the substituents with different electron effects at the nitrogen atoms of the heterocycles on the absorption spectra of indoheptamethinecyanines has been studied.
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