INFRARED DISPERSION OF THE PENTACHLOROPHENOL-SYM-COLLIDINE COMPLEX

The optical constants of the hydrogen-bonded complex of pentachlorophe nol with 2,3,6-trimethylpyridine in binary systems were determined in the 12500-600 cm(-1) range using a new thin film transmission techniqu e, which takes into account the dispersion of the refractive index in the visible region and the absorption in the NIR an MIR ranges. From t hese data the spectra of both components of the complex electric permi ttivity in the NIR and MIR regions and related high-frequency dielectr ic properties of the hydrogen-bonded complex were determined and discu ssed. A considerable increase of the molar vibrational polarization du e to hydrogen bond formation has been demonstrated. The results have b een compared with data obtained previously for similar systems. (C) 19 98 Elsevier Science B.V. All rights reserved.