Please use this identifier to cite or link to this item: https://hdl.handle.net/10593/22341
Title: FT-TR, UV-VISIBLE AND X-RAY STUDIES OF COMPLEXES OF PYRIDINE N-OXIDES WITH PENTACHLOROPHENOL
Authors: Dega-Szafran, Zofia
Grunwald-Wyspianska, Monika
Kania, Anna
Kosturkiewicz, Zofia
Tykarska, Ewa
Szafran, Mirosław
Keywords: Hydrogen-Bonds
trifluoroacetic-acid
1:1 complex
proton-transfer
IR
phenole
Issue Date: 1-Nov-1995
Citation: JOURNAL OF MOLECULAR STRUCTURE 356 (3) 169-182
Abstract: The crystal structure of the 4-methoxy-2,6-dimethylpyridine N-oxide pentachlorophenol complex has been determined by X-ray analysis. The O ... O distance is 2.439(6) Angstrom, the OHO angle is 152.3 degrees and the hydrogen-bonded proton is close to the phenol molecule. The FT-IR spectra of pentachlorophenol complexes with some substituted pyridine N-oxides in the solid state and seven aprotic solvents of different polarity (epsilon from 2.27 to 37.5) show a broad absorption. The broad absorption shows weak dependence upon solvent polarity and is classified as type (ii). UV spectra show that in the investigated complexes protons are not transferred from the phenol to the N-oxides. Formamide (epsilon = 111) is a much stronger proton acceptor than the pyridine N-oxides. Pentachlorophenol in formamide is converted to the phenolate ion.
URI: http://hdl.handle.net/10593/22341
ISSN: 0022-2860
Appears in Collections:Artykuły naukowe (WCh)

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