Solvatochromism and halochromism of some furo/pyrazole cyanine dyes

Mapping Intimacies ◽

10.31219/osf.io/v2zm6 ◽

2021 ◽

Author(s):

CI Chemistry International

Keyword(s):

Absorption Spectra ◽

Electronic Absorption ◽

Electronic Absorption Spectra ◽

Mixed Solvents ◽

Cyanine Dyes ◽

Buffer Solutions ◽

Ph Values ◽

Universal Buffer ◽

Different Types

In this study, the electronic absorption spectra of some furo[2,3-b]pyrazole cyanine dyes was recorded and investigated in a number of 6 (six) pure solvents having different polarities [water (78.54), D.M.F (36.70), ethanol (24.3), chloroform (4.806), CC14 (2.238) and dioxane (2.209)], mixed solvents [DMF- H2O] and/or in a series of 8 (eight) aqueous universal buffer solutions having varied pH values [1.65, 2.32, 4.62, 5.85, 6.41, 7.82, 9.61 and 11.63 units] to evaluate their solvatochromic and/or halochromic properties, respectively. The study covers different types of cyanine dyes, it includes monomethine cyanine dyes (simple cyanine dyes), dimethine cyanine dyes and tetramethine cyanine dyes.

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Structure and electronic absorption spectra of cyanine dyes – derivatives of tetrazolo- and triazoloisoindole

French-Ukrainian Journal of Chemistry ◽

10.17721/fujcv5i2p95-102 ◽

2017 ◽

Vol 5 (2) ◽

pp. 95-102

Author(s):

Tatyana Yegorova ◽

Andriy Kysil ◽

Igor Levkov ◽

Andrei Ilchenko ◽

Zoia Voitenko

Keyword(s):

Electronic Structure ◽

Absorption Spectra ◽

Electronic Absorption ◽

Electronic Absorption Spectra ◽

Cyanine Dyes ◽

End Groups ◽

Electron Donation ◽

Derivatives Of

The electronic structure and absorption spectra of cyanine dyes – tetrazoloisoindole derivatives and triazoloisoindole were calculated. It was shown that these dyes, in terms of their electronic structure, are trimethine cyanine, although formally they are monomethine cyanine. The electron donation of the tetrazoloisoindole and triazoloisoindole residues was determined on the Ilchenko scale, which allows them to quantitatively quantify their Bruker basicity in comparison with the most known heterocyclic end groups of cyanine dyes.

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Novel carbocyanine and bis-carbocyanine dyes: synthesis, visible spectra studies, solvatochromism and halochromism

10.31221/osf.io/hgw3v ◽

2019 ◽

Author(s):

Chem Int

Keyword(s):

Spectral Data ◽

1H Nmr ◽

Elemental Analysis ◽

Cyanine Dyes ◽

Ethanol Solution ◽

Carbocyanine Dyes ◽

Buffer Solutions ◽

Ph Values ◽

Universal Buffer ◽

Visible Spectra

Novel carbocyanine dyes (trimethine cyanine dyes) and bis-carbocyanine dyes (bis-trimethine cyanine dyes) derived from the nucleus of benzo[2,3-b; 2',3'-b'] bis-furo[2,3-d]imidazoline-3,5,8,10-tetra one were synthesized. The electronic visible adsorption spectra of all the synthesized cyanine dyes were investigated in 95% ethanol solution. Solvatochromism and/or halochromism for some selected dyes were examined in pure solvents having different polarities (water, dimethylformamide, ethanol, chloroform, carbontetrachloride and dioxane) and/or in aqueous universal buffer solutions owing varied pH values (1.45, 2.03, 3.72, 5.09, 7.57, 8.91, 10.20 and 12.04 units), respectively. Structural confirmations were determined by elemental analysis, visible, mass, IR and 1H NMR spectral data.

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