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Vibrational spectra of the trihalocyclopropenium ions [C3X3]+ (X = Cl, Br or I)

1992; Pergamon Press; Volume: 48; Issue: 2 Linguagem: Inglês

10.1016/0584-8539(92)80024-q

1873-3824

Michael J. Taylor, Peter N. Gates, PW Smith,

Chemical Reactions and Mechanisms

Vibrational spectra are reported and assigned for the planar D3h symmetry cyclopropenium cations [C3X3]+ (X= Cl, Br or I) from investigations of the compounds C3Cl3AlCl4, C3Cl3GaCl4, C3Cl3FeCl4, C3Cl3SbCl6, C3Br3AlBr4 and C3l4, using conventional infrared and Raman spectroscopy and Fourier transform Raman spectroscopy. The symmetric C—X stretching modes of [C3X3]+ occur at 458, 269 and 180 cm−1 and the ring-breathing modes at 1790, 1732 and ca. 1650 cm−1 in [C3Cl3]+, [C3Br3]+ and [C3I3]+, respectively. A normal coordinate calculation is performed for [C3Cl3]+.