Cation–Anionic Interactions of Dyes in Aqueous Solutions: Bromocresol Purple in the Processes of Dissimilar Association
Abstract
:1. Introduction
2. Materials and Methods
3. Results
3.1. Dyes in the Aqueous Solution
3.2. Spectral Properties of the Dyes
4. Discussion
4.1. Spectral and Equilibrium Properties of Dissimilar Associates
4.2. Energy and Structural Properties of Dissimilar Associates
5. Conclusions
Funding
Institutional Review Board Statement
Informed Consent Statement
Conflicts of Interest
References
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Dye | pKa1 (λmax, nm HAn− or Ct+) | pKa2 (λmax, nm An2−) |
---|---|---|
3,3-bis(3-bromo-4-hydroxy-5-methylphenyl)- 3H-2,1λ⁶-benzoxathiole-1,1-dione (BP) CAS 115-40-2 | −0.75 | 6.40 |
1-ethyl-2-[3-(1-ethyl-1,2-dihydroquinolin-2-ylidene) prop-1-en-1-yl]quinolin-1-ium chloride (QB+) CAS 2768-90-3 | 3.5 (600, α-band; 550, β-band) | – |
2-(-(4-dimethylamino)styryl)-1-ethylquinolinium iodide (QR+) CAS 117-92-0 | 2.63 (528) | – |
Cation | lg Kas | |
---|---|---|
Ct+·HAn− | (Ct+)2·An2− | |
QB | 6.61 ± 0.07 | 11.16 ± 0.11 |
QR | 4.84 ± 0.06 | 8.29 ± 0.05 |
State | Arrangement of BP and QB Ions |
---|---|
1 | |
2 | |
3 | |
4–5 |
An Associate | Σ, kJ/mol | ΔfHo, kJ/mol | Σ − ΔfHo, kJ/mol/δ, % |
---|---|---|---|
QB+∙BP− | 359 | 202 | 157/28 |
QR+∙BP− | 303 | 107 | 194/14 |
(QB+)2∙BP2− | 1367 | 703 | 664/6 |
(QR+)2∙BP2− | 1254 | 525 | 729/7 |
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Shapovalov, S.A. Cation–Anionic Interactions of Dyes in Aqueous Solutions: Bromocresol Purple in the Processes of Dissimilar Association. Colorants 2022, 1, 5-19. https://0-doi-org.brum.beds.ac.uk/10.3390/colorants1010003
Shapovalov SA. Cation–Anionic Interactions of Dyes in Aqueous Solutions: Bromocresol Purple in the Processes of Dissimilar Association. Colorants. 2022; 1(1):5-19. https://0-doi-org.brum.beds.ac.uk/10.3390/colorants1010003
Chicago/Turabian StyleShapovalov, Serghey A. 2022. "Cation–Anionic Interactions of Dyes in Aqueous Solutions: Bromocresol Purple in the Processes of Dissimilar Association" Colorants 1, no. 1: 5-19. https://0-doi-org.brum.beds.ac.uk/10.3390/colorants1010003