Infrared observation of linear GeC3 trapped in solid Ar

摘要

Linear GeC3 has been synthesized and its vibrational spectrum observed for the first time. The cluster was detected by Fourier transform infrared spectroscopy when the products from the dual laser ablation of either a pair of carbon and germanium rods or a single, sintered germanium-carbon rod were trapped in solid Ar at 10 K. Comparison of 13C isotopic shift measurements with the predictions of density functional theory calculations at the B3LYP/cc-pVDZ level has resulted in the identification of the 1 and 2 modes of linear GeC3 at 1903.9 and 1279.6 cm-1, respectively. For the related group IV clusters, this result is in contrast to SiC3 for which two cyclic isomers have been observed but similar to C4 for which only the linear isomer has been observed spectroscopically.