Abstract
Abstract The far infrared spectra (140–50 cm −1 ) of hydrogen bonded complexes involving 3,5-dichlorophenol and N-Me imidazole, N 6 ,N 6 ,N 9 -triMe adenine, N 9 -Me purine and caffeine have been investigated in chloroform solution. The force constants k OH and k σ have been calculated by the potential function of Lippincott-Schroeder and a simple intermolecular force field. The best fit between the two calculations allows one to estimate the interaction constants and the effective reduced masses of the interacting molecules. For the caffeine complex, other contributions to the far infrared absorption cannot be excluded.
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