Infrared spectra of HF complexes with CCl4, CHCl3, and CH2Cl2 in solid argon

Rodney D. Hunt, Lester Andrews

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Abstract

Hydrogen fluoride complexes with CCl4, CHCl3, and CH2Cl2 were prepared in argon matrices and characterized by infrared spectroscopy. The spectra of CCl4 and HF revealed a strong CCl4-HF complex absorption at 3876 cm-1 with a considerably weaker band at 3904 cm-1 due to the CCl4-FH complex. Only one 1:2 complex, CCl4-HF-HF, was observed at higher HF concentrations and matrix annealings. Similarly, the HF interaction with CH2Cl2 produced two 1:1 complexes and one 1:2 complex. However, the major product absorption at 3901 cm-1 was assigned to the anti-hydrogen-bonded complex, CH2Cl2-FH, while a less intense doublet due to the CH2Cl2-HF complex appeared at 3799 and 3793 cm-1. The IR spectra of CHCl3 and HF were more complicated due to the presence of a third 1:1 complex. The CHCl3-HF complex band at 3860 cm-1 was clearly the strongest product absorption. In addition, the CHCl3-FH complex produced a 3903-cm-1 absorption, while a triplet probably due to the HF-HCCl3 complex was observed at 3893, 3883, and 3875 cm-1. Finally, the acid-base properties of these common solvents were considered.

Original languageEnglish
Pages (from-to)6945-6949
Number of pages5
JournalJournal of Physical Chemistry
Volume96
Issue number17
DOIs
StatePublished - 1992

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