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- W2037746481 abstract "A new heteroditopic macrobicyclic compound (t2pN5O3) containing two separate polyoxa and polyaza compartments was synthesized in good yield through a [1 + 1] “tripod–tripod coupling” strategy. The X-ray crystal structure of H3t2pN5O33+ revealed the presence of one encapsulated water molecule accepting two hydrogen bonds from two protonated secondary amines and donating a hydrogen bond to one amino group. The acid–base behavior of the compound was studied by potentiometry at 298.2 K in aqueous solution and at ionic strength 0.10 M in KCl. The results revealed unusual protonation behavior, namely a surprisingly low fourth protonation constant contrary to what was expected for the compound. 1H NMR and DOSY experiments, as well as molecular modeling studies, showed that the water encapsulation and the conformation observed in the solid state are retained in solution. The strong binding of the encapsulated water molecule, reinforced by the cooperative occurrence of a trifurcated hydrogen bond at the polyether compartment of the macrobicycle, account for the very low log K4H value obtained." @default.
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- W2037746481 date "2012-08-06" @default.
- W2037746481 modified "2023-10-17" @default.
- W2037746481 title "Water Encapsulation in a Polyoxapolyaza Macrobicyclic Compound" @default.
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- W2037746481 doi "https://doi.org/10.1021/jo300799s" @default.
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