Solvatochromic studies in quinoline and cyanoquinoline. Preferential solvation in alcohol-cyclohexane binary mixtures

Santo, Marisa; Jorge, Dinis-Oliveira Ricardo; Cattana, Anunziata Rosa; Silber, Juana J.

doi:10.1016/0584-8539(95)01341-q

Cited by 2 publications

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“…This is, as discussed earlier, different from the bulk composition of the mixed solvent. 34 Moreover, when solventÀsolvent specific interactions in the mixture are possible, the mixtures do not behave as ideal solutions. Then, both soluteÀsolvent and solventÀsolvent interactions have been found to play significant roles in the preferential solvation characteristics.…”

Section: ' Results and Discussionmentioning

confidence: 99%

“…Then, both soluteÀsolvent and solventÀsolvent interactions have been found to play significant roles in the preferential solvation characteristics. 34 As the B 1 frequency values is mainly sensitive to the polarity of the medium, and the AbsB 2 /AbsB 1 ratio is only sensitive to the H-bond donor ability of the solvent (specific interaction), 45 we can use both parameters in order to quantify the preferential solvation around QB.…”

Section: ' Results and Discussionmentioning

confidence: 99%

“…Considering that the solvation shell obeys the regular solution laws, it is possible to quantify the preferential solvation as follows: 34 we may calculate the set of local mole fractions considering that the QB ν max value in the GY:DMF mixtures can be expressed as eq 2:…”

Section: ' Results and Discussionmentioning

confidence: 99%

“…A parameter, Δ, 34,51 which can be used to quantify the extent of the preferential solvation can be defined as…”

Section: ' Results and Discussionmentioning

confidence: 99%

“…As a result of the intermolecular interactions, preferential solvation of solutes in mixed solvents may be observed. This term applies if the local mole fractions of the solvent components in a solvation microsphere surrounding the solute differ from the bulk ones. − …”

Section: Introductionmentioning

confidence: 99%

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A New Organized Media: Glycerol:N,N-Dimethylformamide Mixtures/AOT/n-Heptane Reversed Micelles. The Effect of Confinement on Preferential Solvation

et al. 2011

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In this work we investigate the behavior of the glycerol (GY):N,N-dimethylformamide (DMF) mixture in homogeneous and sodium 1,4-bis(2-ethylhexyl)sulfosuccinate (AOT)/n-heptane reversed micelles (RMs) media. To achieve this goal we have used the solvatochromic behavior of 1-methyl-8-oxyquinolinium betaine (QB) as an absorption probe, and dynamic light scattering (DLS). QB shows strong preferential solvation when it is dissolved in the GY:DMF mixture, and, as QB is a good hydrogen bond acceptor molecular probe, it is preferentially solvated by the GY-DMF hydrogen-bonded (H-bonded) species. On the other hand, when the GY:DMF mixture was investigated in AOT RMs, the results show that the mixture is encapsulated in the polar core of the AOT RMs. DLS confirms the formation of the GY:DMF/AOT/n-heptane RMs since an increase in the W(s)=([GY]+[DMF])/[AOT] values causes an increment in the RMs droplets sizes. The solvatochromic behavior of QB, which resides at the AOT RMs interface, shows that QB is mostly solvated by GY molecules, especially at low W(s) values. Thus, it seems that upon encapsulation inside the polar core of the AOT RMs, the GY-DMF interaction diminishes due to the strong AOT-GY interaction. (1)H NMR chemical shifts of GY and DMF measured in the different AOT RMs investigated shows that GY and DMF behave practically as noninteracting solvents inside the RMs.

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Section: ' Results and Discussionmentioning

confidence: 99%

Section: ' Results and Discussionmentioning

confidence: 99%

Section: ' Results and Discussionmentioning

confidence: 99%

“…A parameter, Δ, 34,51 which can be used to quantify the extent of the preferential solvation can be defined as…”

Section: ' Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A New Organized Media: Glycerol:N,N-Dimethylformamide Mixtures/AOT/n-Heptane Reversed Micelles. The Effect of Confinement on Preferential Solvation

et al. 2011

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More Evidence on the Control of Reverse Micelles Sizes. Combination of Different Techniques as a Powerful Tool to Monitor AOT Reversed Micelles Properties

et al. 2013

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In this work, we have investigated the behavior of 4-aminophthalimide (4-AP) in solvent mixtures of ethyl lactate (EL)- water and EL-n-heptane and in reversed micelles (RMs) media made of EL-water/sodium 1,4-bis(2-ethylhexyl)sulfosuccinate (AOT)/n-heptane. We have used dynamics light scattering (DLS) and absorption, steady-state and time-resolved emission (TRES) techniques. 4-AP is a very interesting and unique molecule used to study preferential solvation in water mixtures since its emission profile changes dramatically when its sphere shell is solvated by water molecules. Thus, in homogeneous media 4-AP is strongly solvated by water in the EL-water mixture and by EL in the EL-n-heptane mixture, results that show the importance of the hydrogen bonding in the 4-AP solvation. We were motivated by this feature of 4-AP and have used it to monitor properties in AOT RMs. Thus, we use 4-AP spectroscopic behavior in conjunction with DLS technique to reveal the location of each polar solvent of the mixture encapsulated within the RMs media. We found that in the EL-water/AOT/n-heptane RMs the results strongly depend on the amount of water dissolved. Below W0 = [water]/[AOT] = 5, there are no reversed micelles and EL, water, AOT and n-heptane forms a nonstructured mixture. For W0 values between 5 and 10, the droplet sizes are independent of the EL content because of its strong intermolecular interactions forms an EL polar core and only water is found at the interface. For W0 values higher than 10, the droplets size increase with the EL content and EL molecules are detected at the AOT RMs interface. We inferred that the RMs sizes will change only if the polar solvent encapsulated interacts with the interface changing the surfactant packing parameter. Then, we can assume that it is possible to create RMs with solvents that do not interact with the interface but can be encapsulated in the polar core. These results, give evidence that expand the knowledge about which are the factors that determine when RMs droplet sizes changes with the polar solvent content, giving insights that will help to control the sizes of the AOT RMs. This will open diverse avenues since RMs are interesting nanoreactors for heterogeneous chemistry, templates for nanoparticles and models for electron transfer reaction that happens in membranes.

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Solvatochromic studies in quinoline and cyanoquinoline. Preferential solvation in alcohol-cyclohexane binary mixtures

Cited by 2 publications

References 0 publications

A New Organized Media: Glycerol:N,N-Dimethylformamide Mixtures/AOT/n-Heptane Reversed Micelles. The Effect of Confinement on Preferential Solvation

A New Organized Media: Glycerol:N,N-Dimethylformamide Mixtures/AOT/n-Heptane Reversed Micelles. The Effect of Confinement on Preferential Solvation

More Evidence on the Control of Reverse Micelles Sizes. Combination of Different Techniques as a Powerful Tool to Monitor AOT Reversed Micelles Properties

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