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Low interface tensions: Although polar, ILs can have low interface tensions which in addition seems to adapt to the other phase (e.g. for 1-butyl-3-methylimidazolium tetrafluoroborate 38 against air ). Since low interface tensions result in high nucleation rates, verysmall particles can be generated which undergo Ostwald ripening onlyweakly. Low interface energies: Low interface energies for larger objects can be translated into good stabilization or solvatization of molecular species. Obviously, the IL structures ¡°adapts¡± to many species, as it provides hydrophobic regions and a high directional polarizability which be oriented parallel or perpendicular to the dissolved species. Put simply: reactions in ILs are like reactions in a pure ¡°universal¡± ligand. ILs facilitate inorganic synthesis from very polar starting materials under ambient conditions and under anhydrous or water-poor conditions. In this way, hydroxide or oxihydrate formation and the coupled generation of amorphous species can be suppressed, as low amounts of water drive the mass balance to completely condensed systems, which are usually directly crystalline. The most important advantage of ILs, however, is an unconventional and veryrare propertythat cannot be emphasized sufficiently: ILs form extended hydrogenbond systems in the liquid state and are therefore highlystructured. ILs are therefore ¡°supramolecular¡± solvents. Solvent structuration is the molecular basis of most molecular recognition and self-organization processes, with water being the most prominent and pronounced example¡£ this special qualitycan be used as the ¡°entropic driver¡± for spontaneous, well-defined, andextended ordering of nanoscale structures [ Last edited by qingshaojun0823 on 2009-11-9 at 18:09 ] |
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