THE INFRARED-SPECTRUM OF SELENOKETENE

Mid-infrared FTIR spectra of argon matrix isolated selenoketene-d(0) a nd selenoketene-d(1) have been recorded. These transient species were prepared by flow thermolysis of the corresponding 1,2,3-thiadiazoles. With the aid of ab initio predictions of the vibrational frequencies a nd intensities, six of the nine fundamentals have been identified for each isotopomer. The spectra are dominated by a very intense C-C stret ching band; the other fundamentals are significantly weaker and more d ifficult to assign.