Reactivity in organised assemblies

Novel self-assembling system based on resorcinarene and cationic surfactant

“…Thus one can conclude that the DABCO-16 binds outside the cavity since otherwise the upfield shift should be observed for the guest protons due to a shielding effect of the host aromatic rings. 18,41,[63][64][65][66][67] Moreover marked upfield shifts are observed only for protons of the DABCO-16 bicyclic skeleton, i.e. for protons which are vicinal to the positively charged head group.…”

“…[6][7][8][9][10][11][12][13][14][15] Our researches focus on two key biomimetic building blocks, namely supramolecular systems based on surfactants and cyclophanes (calixarenes and pyrimidinophanes), which are capable of binding practically important organic substrates. Applications of these systems as receptors, nanocontainers and nanoreactors [16][17][18][19][20][21][22][23][24][25][26][27] are based on two different mechanisms of self-organization and guest-host interactions. Surfactants are typical selforganizing systems, whose association in aqueous solution is mainly contributed by the hydrophobic effect and results in small micelles formed at a definite concentration, denoted as the critical micelle concentration (cmc).…”

The Nature of the Sodium Dodecylsulfate Micellar Pseudophase as Studied by Reaction Kinetics

“…The increasing interest over the past several decades in organic reactivity in aqueous solutions has resulted in widespread use of micelles to increase the solubility of hydrophobic compounds in aqueous solutions. − In micellar solutions, reactions can be either accelerated or decelerated compared to the reactions in aqueous solutions without added cosolutes. − Remarkable success in enhancing reaction rates has been achieved by applying micelles as catalysts (introducing catalytic moieties in micelle-forming surfactants) and by micelle-assisted catalysis. ,− In micelle-assisted catalysis, micelles solubilize the reactants and the catalyst, placing them in close proximity inside the small volume of the micellar pseudophase. Although highly effective examples of micelle-assisted catalysis are available, rational design of catalytic systems based on quantitative data remains elusive.…”

“…As discussed above, to understand the micellar acceleration and deceleration of reactions, a good understanding of the micellar pseudophase as a reaction medium is necessary. Although many kinetic studies of micellar medium effects on various organic reactions have already been reported, ,,,,, the description of the local reaction environment offered by micelles has remained obscure. The present work continues our kinetic studies of micellar effects on the water-catalyzed hydrolysis of a series of activated amides .…”

“…Although many kinetic studies of micellar medium effects on various organic reactions have already been reported, 6,11,14,15,29,30 the description of the local reaction environment offered by micelles has remained obscure. The present work continues our kinetic studies of micellar effects on the water-catalyzed hydrolysis of a series of activated amides.…”