Abstract
The infrared dichroismic behaviors of molecules enclosed in a thiourea channel were investigated with an infrared microscope by using oriented single crystals of adducts. The absorptions of guest molecules in the region between 3000 and 1650cm-1, 1590 and 1500cm-1, and 1050 and 730cm-1 were found to be measurable with this technique. The vibrational species of some of these absorptions were determined, especially in case of trans-and cis-decalins. Molecules having carboxylic group were revealed to form dimers as in solutions when they were included in a thiourea channel. This technique would be used to study dichroism of some kinds of organic molecules under certain limitation. Environmental effect exerted by thiourea cage has been also estimated. The results showed that it is comparable with that of solvents of dielectric constant 2.5-5.5.
