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- W2019675346 abstract "Abstract A new class of ditopic receptor molecules have been synthesized and structurally characterized. The unique structural features of these molecules are: (a) a very lipophilic unit that consists of two 3,5-di-t-butylsalicylideneimine moieties that form a square O2N2 coordination site and (b) a relatively hydrophilic benzo-18-crown-6 unit capable of binding to alkali metal ions and hydrogen bonding with ammonium functional groups. These molecules are totally insoluble in water but very soluble in non-polar solvents. By virtue of their hydrophilic end, they are able to invade the water-organic solvent interface and retrieve hydrophilic molecules from water solution that subsequently are extracted into the organic solvent. Procedures are described for the syntheses of the {H2-tBu4-salphen-18-cr-6 and also 15-crown-5 and 12-crown-4 derivatives. With dibenzo-crown ethers 2:1 tBu4-salphen:crown ether molecules have been obtained with 18-crown-6, 24-crown-8 and 30-crown-10 ‘bridges’. A variety of metal ions (Mn3+, Fe2+, Fe3+, Co2+, Ni2+ and Cu2+) have been incorporated within the N2O2 cavity of the salphen subunits in the 18-crown-6 and 24-crown-8 hybrids. An account of structural features and transport characteristics for some of these molecules are reported. The results of a detailed study of the transport of tryptophan and serotonin across CHCl3 bulk liquid membranes are discussed for these processes that follow Michaelis–Menten kinetics. To cite this article: D. Coucouvanis et al., C. R. Chimie 6 (2003)." @default.
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- W2019675346 date "2003-03-01" @default.
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- W2019675346 title "Recognition and transport of amphiphilic molecules by a new class of inorganic ditopic receptors. The synthesis of M-t Bu4-salphen-3n-cr-n complexes and their use (M = Mn,Fe, n = 6) in the transport of tryptophan and serotonin across bulk liquid membranes" @default.
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- W2019675346 doi "https://doi.org/10.1016/s1631-0748(03)00041-9" @default.
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