10.1002/asia.201601545
Chemistry - An Asian Journal
FULL PAPER
pseudo[4]rotaxane as [2]rotaxane, in which the stoppers is not
the bulky groups in covalent bond, but the cyclic CB[7] by non-
covalent interaction. This new observation will open a door for
designing a wide range of rotaxane, which maybe possess a lot
of specific applications like molecular cars, molecular bearings.
Acknowledgements
We thank the National Natural Science Foundation of China
(Nos. 21372128, 21432004, and 91527301), and the 973
Program (2015CB856500) for financial support.
Keywords: Supramolecular Chemistry • Pseudorotaxane •
Experimental Section
Rotaxane
Materials. All the reagents and solvents were commercially available and
used as received unless otherwise specified purification. The phosphate
buffer solution of pH 7.2 was prepared by dissolving disodium hydrogen
phosphate (Na2HPO412H2O, 25.75 g) and sodium dihydrogen
phosphate (NaH2PO42H2O, 4.34 g) in distilled deionized water (1 L) to
make a 0.1 M solution. The pH value of the buffer solution was then
verified on a pH-meter calibrated with two standard buffer solutions.
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Measurements. NMR spectra were recorded using a Bruker AV400
instrument or a Varian Mercury VX-300 spectrometer in D2O, d6-DMSO.
Electrospray ionization mass spectra (ESI-MS) were measured by
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A
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