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Summary Stable C–H⋯O hydrogen bonded complexes between choloroform and three small cyclic ketones (cyclohexanone, cyclopentanone, cyclobutanone) are identified by use of FTIR spectroscopy in CCl4 solution at room temperature. The C–H stretching fundamental of chloroform (νC-H) in the said three complexes exhibits blue shifting with enhancement in νC-H transition intensity. However, the red shifts...
Summary Matrix isolation infrared spectra of 1,2-cyclohexanedione (1,2-CHD) and 3-methyl-1,2-cyclohexanedione are measured in a nitrogen matrix at 8K temperature. The spectra reveal that in the matrix environment both the molecules exist exclusively in monohydroxy tautomeric forms with an intramolecular O–H⋯O=C hydrogen bonding. In the case of 3-MeCD, the fundamental of OH stretching νO−−H band appears...
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