Reactivity in organised assemblies

Chechik, Victor

doi:10.1039/b518101c

Cited by 6 publications

(6 citation statements)

References 93 publications

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“…The additional acceleration of the reaction of iodide with methyl naphthalene-2-sulfonate at very high iodide concentrations is explained by ''electrolyte invasion'' in the micellar region. The rate effects of added iodide are reproduced using an equation that describes the iodide concentration in the micellar pseudophase in terms of a Langmuir isotherm in addition to a term equalling the total iodide concentration in solution [eqn (1)].…”

Section: Reactivity In Micelles a Medium Effects And Compartmentalisa...mentioning

confidence: 99%

“…We have chosen to interpret ''organised assemblies'' in a rather more liberal way than in previous years. [1][2][3] now including assemblies such as those involving DNA as well as constructions resulting from dynamic combinatorial self assembly which were turned into covalent ''non dynamic assemblies''. In all cases, however, (self) organisation and (self) assembly are crucial to the results discussed.…”

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confidence: 99%

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Reactivity in organised assemblies

Onel

Buurma

2009

Annu. Rep. Prog. Chem., Sect. B: Org. Chem.

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This report reviews the 2008 literature on reactivity in organised assemblies. The report is subdivided in sections discussing (1) reactivity in micelles, including medium effects and compartmentalisation, enzymatic catalysis in micellar media and metallomicellar catalysis, (2) reactivity in vesicles, (3) reactivity in emulsions, (4) reactions in assemblies resulting from dynamic combinatorial chemistry and template approaches, (5) DNA-based approaches to influence reactivity including catalysis by DNA, DNA-templated synthesis and DNA-based asymmetric synthesis, (6) reactivity in nanoparticleimmobilised assemblies and (7) modulation of nanoparticle catalysis through the use of thermoresponsive polymers. We have chosen to interpret ''organised assemblies'' in a rather more liberal way than in previous years. [1][2][3] now including assemblies such as those involving DNA as well as constructions resulting from dynamic combinatorial self assembly which were turned into covalent ''non dynamic assemblies''. In all cases, however, (self) organisation and (self) assembly are crucial to the results discussed. Related to the liberal interpretation of organised assemblies, this report does not (and cannot) aim to present an exhaustive review.

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Section: Reactivity In Micelles a Medium Effects And Compartmentalisa...mentioning

confidence: 99%

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confidence: 99%

Reactivity in organised assemblies

Onel

Buurma

2009

Annu. Rep. Prog. Chem., Sect. B: Org. Chem.

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“…The chemistry in conned media mimics the extremely efficient chemical or biological processes occurring in nature. 38 The photophysical properties of coumarin dyes in different conned media such as cyclodextrins, micelles and reverse micelles have been reported in the literature. [19][20][21][22][23][24][25][39][40][41][42][43][44][45][46][47][48][49] To know the effect of connement on the photodynamics of 7-DCCAE we have used isooctane/AOT/water reverse micelles.…”

Section: Introductionmentioning

confidence: 99%

The photophysics of 7-(diethylamino)coumarin-3-carboxylic acid N-succinimidyl ester in reverse micelle: excitation wavelength dependent dynamics

2014

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This paper focuses on the photophysical studies of 7-(diethylamino)coumarin-3-carboxylic acid N-succinimidyl ester (7-DCCAE) in aqueous reverse micelles using steady state absorption, fluorescence emission and picosecond time resolved emission spectroscopy. We used sodium dioctylsulfosuccinate (AOT) as surfactant to prepare reverse micelles. We have observed excitation wavelength dependent photophysics of 7-DCCAE in the reverse micelles. The red edge excitation shift (REES) was found in the reverse micelles, at different w 0 values. The REES gradually decreases with increase in size of the water pool. The rotational relaxation time of the dye molecule decreases with increasing the mole ratio of water to surfactant (w 0 ) inside the reverse micelles. The fluorescence anisotropy decays were found biexponential in nature with fast and slow reorientation times, which is explained by two steps and "wobbling-in-cone model". We have observed the excitation wavelength dependent dynamics of 7-DCCAE in the reverse micelles. We have observed the difference in the photophysics 7-DCCAE with its acid form. Scheme 1 Schematic representation of 7-DCCAE. 3462 | RSC Adv., 2014, 4, 3461-3471 This journal is a Experimental error of AE5%. b c 2 values are under 1.2. 3464 | RSC Adv., 2014, 4, 3461-3471 This journal isFig. 2 (a) Change in the fluorescence emission peak positions of 7-DCCAE with the change in the excitation wavelengths in isooctane/water/ AOT reverse micelle at w 0 ¼ 5. (b) Plot of FWHM of the fluorescence emission spectra of 7-DCCAE in isooctane/water/AOT reverse micelles at various w 0 values (0 to 30) for (i) l exi ¼ 375 nm (-) and (ii) l exi ¼ 405 nm (). This journal is a Experimental error of AE5%. hsi rot ¼ a 1 s 1 + a 2 s 2 + a 3 s 3 . b c 2 values are under 1.2.This journal is

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“…An organic reaction utilizing an amphiphilic molecule or material in water offers several unforeseen reactivities or selectivities because of the strong affinity between substrate and catalyst based on the hydrophobic effect. [85][86][87][88][89][90][91][92][93][94][95][96][97][98][99] In addition, the use of water is a better choice to carry out organic reactions from the viewpoint of green synthesis because water offers practical advantages over organic solvents: it is cheap, readily available, nontoxic, and nonflammable. Although various organic reactions are carried out in the presence of an amphiphilic molecule such as surfactants, the difficulties in separation of organic products at the end of the reaction often diminish its utility, and subsequent clean up of the dirty water containing surfactants and inorganic agents could also be trouble.…”

Section: Introductionmentioning

confidence: 99%