Preferential solvation of Brooker's merocyanine in binary solvent mixtures composed of formamides and hydroxylic solvents.

  title={Preferential solvation of Brooker's merocyanine in binary solvent mixtures composed of formamides and hydroxylic solvents.},
  author={Tharly Bevilaqua and Domingas C da Silva and Vanderlei Gageiro Machado},
  journal={Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy},
  volume={60 4},
The ET polarity values of 4-[(1-methyl-4(1H)-pyridinylidene)-ethylidene]-2,5-cyclohexadien-1-one (Brooker's merocyanine) were collected in mixed-solvent systems comprising a formamide [N,N-dimethylformamide (DMF), N-methylformamide (NMF) or formamide (FA)] and a hydroxylic (water, methanol, ethanol, propan-2-ol or butan-1-ol) solvent. Binary mixtures involving DMF and the other formamides (NMF and FA) as well as NMF and FA were also studied. These data were employed in the investigation of the… Expand
Solvatochromic behavior of 1-(p-dimethylaminophenyl)-2-nitroethylene in 24 binary solvent mixtures composed of amides and hydroxylic solvents
Abstract The molar transition energy ( E T ) polarity values of 1-( p -dimethylaminophenyl)-2-nitroethylene were collected in mixed solvent systems comprising a formamide [ N , N -dimethylformamideExpand
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The molar transition energy (E(T)) polarity values for the solvatochromic probes revealed a very different profile in comparison with the other two dyes, which suggests that in mixtures containing chloroform, the microenvironment of the dye seems to be important in determining the contribution of the structure resonances responsible for the stability of the dyed. Expand
Solvent effects in the interaction of methyl-beta-cyclodextrin with solvatochromic merocyanine dyes.
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Relative predominance of azo and hydrazone tautomers of 4-carboxyl-2,6-dinitrophenylazohydroxynaphthalenes in binary solvent mixtures.
  • O. A. Adegoke
  • Chemistry, Medicine
  • Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy
  • 2011
The 4-carboxyl-2,6-dinitrophenylazohydroxynaphthalenes, previously shown to exhibit azo-hydrazone tautomerism, were studied for the relative predominance of one form over another based on interaction at the microenvironment of binary solvent mixtures containing DMF and non-hydrogen bonding. Expand
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The present study elucidates the reinvestigation of the photophysical behavior of 3-aminobenzoic acid (3ABA) in solvents of different polarities using the steady-state spectroscopic techniques and describes unnoticed sigmoidal behavior in the ground state and synergistic impact in the excited state. Expand
Interaction of Cyclodextrins with Brooker's Merocyanine in Aqueous Solution
ABSTRACT The UV-Vis spectroscopic behavior of the solvatochromic dye 4-[(1-methyl-4(1H)-pyridinylidene)-ethylidene]-2,5-cyclohexadien-1-one (Brooker's merocyanine) was investigated in aqueousExpand
Solvatochromic and Preferential Solvation Studies on Schiff Base 1,4-Bis(((2-Methylthio)Phenylimino)Methyl) Benzene in Binary Liquid Mixtures
The solvatochromic behavior of the 1,4-bis(((2-methylthio) phenylimino)methyl) benzene in single solvents and binary mixtures were investigated and the dipole moment ratios between ground and excited states were deduced. Expand


Solute-solvent and solvent-solvent interactions in the preferential solvation of Brooker's merocyanine in binary solvent mixtures
The ET polarity values of 4-[(1-methyl-4(1H)-pyridinylidene)ethylidene]-2,5-cyclohexadien-1-one, better known as Brooker's merocyanine, were collected in binary mixtures comprising a non-proticExpand
Preferential solvation of a hydrophobic probe in binary mixtures comprised of a nonprotic and a hydroxylic solvent: A view of solute-solvent and solvent-solvent interactions
The fluorescence of pyrene, a hydrophobic probe, was investigated in binary mixtures comprising a nonprotic [acetonitrile, N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), and tetrahydrofuraneExpand
Preferential solvation in mixed binary solvents: ultraviolet–visible spectroscopy of N-alkylpyridinium lodides in mixed solvents containing cyclic ethers
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Fundamental Studies on Brooker's Merocyanine
The spectroscopic properties of solvent soluble derivatives of Brooker's simple merocyanine 4-[(1-methyl-4(1H)-pyridinylidene)ethylidene]-2,5-cyclohexadien-1-one, which can in principle exist in twoExpand
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The preferential solvation of the solvatochromic dye N,N, N′,N′-tetramethylethylenediaminoacetyl-acetonatocopper(II) perchlorate (1), [Cu(tmen)(aca)]ClO–4, in binary solvent mixtures comprising oneExpand
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The kinetics of the reactions of 1-fluoro-2,4-dinitrobenzene with morpholine and piperidine were studied at 25 °C in several binary solvent mixtures of the polar aprotic hydrogen bond acceptorExpand
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Studies on the solvatochromic behaviour of N-methyl-4- and N-methyl-2-[(4-dimethylaminophenyl)iminomethyl]pyridinium iodide dyes in a variety of solvents and the preferential solvation of the formerExpand
Ion-dipole S(N)2 reaction in acetone-water mixtures. Electrostatic and specific solute-solvent interactions.
The results suggest that the addition of water to acetone reduces abruptly the rate of substitution due to the preferential solvation (PS) of the phenoxide ion by the hydrogen-bonding donor (HBD) solvent. Expand
Structural characterization of the ternary solvent mixture methanol–acetonitrile–1‐propanol
Refractive indices and ET values were measured for the ternary mixture methanol–acetonitrile–1-propanol at 25.0 °C for 13 mole fractions, and also for the corresponding binary mixtures,Expand