Syntheses and electronic absorption spectra of some new penta- and di-methine cyanine dyes

1997 ◽  
Vol 8 (3) ◽  
pp. 259-266 ◽  
Author(s):  
Reda M. Abd El-Aal ◽  
Hassan A. Shindy ◽  
Ahmed Ibrahim M. Koraiem
Keyword(s):  
Absorption Spectra ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Cyanine Dyes

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

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.

scholarly journals Solvatochromism and halochromism of some furo/pyrazole cyanine dyes

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.

Relationship between the Molecular Structure of Cyanine Dyes and the Vibrational Fine Structure of their Electronic Absorption Spectra

ChemPhysChem ◽  
2009 ◽  
Vol 10 (5) ◽  
pp. 835-840 ◽  
Author(s):  
Heinz Mustroph ◽  
Knut Reiner ◽  
Jürgen Mistol ◽  
Steffen Ernst ◽  
Dietmar Keil ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Fine Structure ◽  
Absorption Spectra ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Cyanine Dyes

ChemInform Abstract: Electronic Absorption Spectra of New γ-Keto-dimethine Cyanine Dyes and Apocyanines

ChemInform ◽  
2010 ◽  
Vol 22 (37) ◽  
pp. no-no
Author(s):  
A. I. M. KORAIEM ◽  
M. M. GIRGIS ◽  
Z. H. KHALIL ◽  
R. M. ABU EL-HAMD
Keyword(s):  
Absorption Spectra ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Cyanine Dyes

Stereochemistry of [carbonato-bis((S)-prolinato)]cobaltate(III) anion

1984 ◽  
Vol 49 (3) ◽  
pp. 680-683 ◽  
Author(s):  
Bohumil Hájek ◽  
Dagmar Sýkorová ◽  
Jiří Chyba
Keyword(s):  
Absorption Spectra ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Cd Spectra

The λ-C1-cis(N), δ-C1-cis(N), λ-C2-cis(N) and δ-C2-cis(N) isomers of the complex K[Co((S)-Pro)2CO3] were chromatographically separated and characterized by their electronic absorption spectra and CD spectra.

Photocolouration of 2,4,4,6-Tetraaryl-4H-pyrans and Their Heteroanalogues: Importance of Hypervalent Photoisomers

1995 ◽  
Vol 60 (10) ◽  
pp. 1621-1633 ◽  
Author(s):  
Stanislav Böhm ◽  
Mojmír Adamec ◽  
Stanislav Nešpůrek ◽  
Josef Kuthan
Keyword(s):  
Reaction Kinetics ◽  
Absorption Spectra ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Theoretical Data ◽  
Order Reaction ◽  
Bleaching Process ◽  
First Order ◽  
Photodegradation Products ◽  
Hypervalent Molecules

Molecular geometries of 2,4,4,6-tetraphenyl-4H-pyran (Ia), 4,4-(biphenyl-2,2e-diyl)-2,6-diphenyl-4H-pyran (Ib) and their heterocyclic isomers II-V were optimized by the PM3 method and used for the calculation of electronic absorption spectra by the CNDO/S-CI procedure. Comparison of the theoretical data with experimental UV-VIS absorption spectra made possible to select hypervalent molecules IIIa, IIIb, IVa and IVb being responsible for the photocolouration of 4H-pyrans Ia, Ib, while compounds Va, Vb, VI and VII come into account as possible photodegradation products. The bleaching process of the UV illuminated compound Ia is analyzed in terms of dispersive first-order reaction kinetics.

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