Scanning tunneling microscopy investigation of an inclusion complex between the beta-cyclodextrin and the sodium salt of the trisulfonated triphenylphosphine
A. Da Costa et al., Scanning tunneling microscopy investigation of an inclusion complex between the beta-cyclodextrin and the sodium salt of the trisulfonated triphenylphosphine, SURF SCI, 470(3), 2001, pp. 275-283
Scanning tunneling microscopy has been used to image on a highly orientated
pyrolytic graphite substrate an inclusion complex between the sodium salt
of the trisulfonated triphenylphosphine (TPPTS) and the beta -cyclodextrin
(CyD). The images were in very good agreement with the structure that has b
een reported for this inclusion complex and it is postulated that beta -CyD
/TPPTS inclusion complex lies on the apolar graphite substrate by its prima
ry face. A correlation of image contrast with the frontier orbitals of the
inclusion complex is also clearly established for the first time in the cas
e of CyD-based supramolecular assemblies. The self-assembly of the inclusio
n complexes on the graphic surface is also discussed. (C) 2001 Elsevier Sci
ence B.V. All rights reserved.