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FOURIER TRANSFORM MICROWAVE SPECTROSCOPY OF THE CONFORMERS OF PERFLUOROBUTANE

Nitrogen matrix IR spectroscopy and calculations of three distinct conformations of perfluoro-butane, -C F , have recently been reported. We have measured the Fourier Transform microwave spectrum of the conformer of perfluoro-butane and determined the C-C-C-C dihedral angle to be 51 . This is in good agreement with the calculations of Albinsson and Michl that predicted dihedral angles of 54 , 95 , and 165 , for the , , and conformations, respectively. The search for the other conformations continues. In addition, the spectrum of the symmetric top isomer, perfluoroisobutane, has been observed.