J. P. Castaneda, G. Denisov, V. Schreiber
Jan 29, 2001
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0
Influential Citations
6
Citations
Journal
Journal of Molecular Structure
Abstract
Abstract Structure of the complexes with NH⋯N hydrogen bond formed by bis(2,3,5,6-tetrafluoro-4-trifluoromethyl-phenyl)-amine ((4-CF 3 C 6 F 4 ) 2 NH, FA) as proton donor with aliphatic amines (dibutyl-, tributyl- and trimethylamines) as proton acceptors in aprotic solvents (isooctane and methylene chloride) in a wide range of concentrations and temperatures have been studied by IR and UV spectra. Quantitative treatment of the spectra by a computer program based on factor analysis reveals the equilibrium between free molecules and FA–aliphatic amine complexes of 1:1 and 1:2 composition, the latter having an ionic structure with proton transferred from FA to the aliphatic amine. Thermodynamic characteristics of the 1:1 and 1:2 complexes for FA+dibutylamine system have been measured. Appearance of IR bands indicating formation of NHN + homoconjugated cation has been detected in FA+trimethylamine solution in methylene chloride at temperatures 190–150 K. Spectral manifestations of the complexes containing the (trimethylamine-H-trimethylamine) + cation, formed by FA and OH proton donor (pentachlorophenol) are compared.