Carbohydrate Research p. 9 - 16 (1989)
Update date:2022-08-10
Topics:
Smith, Nicholas J.
Spotswood, Thomas M.
Lincoln, Stephen F.
19F-N.m.r. studies show that N-trifluoroacetyl-D- and -L-4-fluorophenylalanine and N-trifluoroacetyl-D- and -L-phenylalanine form 1:1 inclusion complexes with cyclomaltohexaose (α-cyclodextrin) characterised by stability constants of 11.44 +/- 1.13, 11.40 +/- 1.09, 6.15 +/- 0.59, and 6.37 +/- 0.81 M-1, respectively, in aqueous 0.1M NaCl at pH 6.5 and 25 deg C.Under similar conditions, the correlation time of N-trifluoroacetyl-<2H8>phenylalanine changed from 65 +/- 4 ps in the free state to 320 +/- 40 ps in the complex, consistent with there being little freedom of movement of the guest in the inclusion complex.
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Doi:10.1039/c39860000746
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(1952)