New class of aggregates in aqueous solution: an NMR, thermodynamic, and dynamic light scattering study |
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Authors: | Sanna Cecilia La Mesa Camillo Mannina Luisa Stano Pasquale Viel Stéphane Segre Annalaura |
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Institution: | Institute of Chemical Methodologies, CNR, Via Salaria km 29.3, 00016 Monterotondo Stazione, Italy. |
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Abstract: | We investigated the aggregation properties of two classes of aromatic and hydrophobic compounds, namely chloroacetamides and ethyl 3-phenyl-2-nitropropionates, in moderately concentrated aqueous solution (millimolar range). The identification of all species present in solution under specific experimental conditions was performed by 1D and 2D NMR, pulsed gradient spin-echo NMR, and dynamic light scattering techniques. Some physical-chemical properties (viscosity, surface tension, and colligative properties) of the aqueous solutions were also determined. Both classes of compounds behave quite similarly: in solution, three distinct species, namely a monomeric species, small and mobile aggregates, and large and stiff aggregates, are observed. The results give insight into a new class of aggregates, held together by pi-pi interactions, which show an unusual associative behavior in water. |
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