Fl. Dickert et al., MOLECULAR MODELING OF HOST-GUEST INTERACTIONS FOR MASS SENSITIVE CHEMICAL SENSORS, Fresenius' journal of analytical chemistry, 352(7-8), 1995, pp. 620-624
Paracyclophanes are effective coatings for mass sensitive chemical sen
sors. The enzyme analogue recognition can preferably be used to detect
aromatic and halogenated hydrocarbons. Molecular modelling by the MM3
force field allows the prediction of an efficient analyte inclusion.
Besides the necessary steric complementarity it could be shown that th
e interaction between the methyl groups of aromatic guests (e.g. tolue
ne) and the aromatic walls of the host is essential for host-guest com
plexation. These phenomena get more pronounced if bicyclic cyclophanes
are applied and these sensitive materials enable the detection of onl
y a few ppm of toluene with SAW devices. Furtheron. the electron-rich
diphenylether moieties of these hosts guarantee interactions with elec
tron-deficiency analytes such as chlorinated hydrocarbons with a selec
tivity superior to that of the monocyclic materials.