Submillimeter-Wave Spectroscopy of Phosphaalkynes: HCCCP, NCCP, HCP, and DCP
Abstract
The submillimeter-wave rotational spectra of the unstable phosphorus-bearing molecules HCCCP (phosphabutadiyne) and NCCP (C-cyanophosphaethyne) have been investigated in selected frequency regions between 490 and 815 GHz using the Cologne Terahertz Spectrometer. Both molecules were studied in their ground vibrational states. Additionally, vibrational satellites within the bending states v4 = 1 and v5 = 1 were recorded for NCCP. Furthermore, the ground state rotational spectra of the 13C and 15N isotopomers of NCCP were detected in natural abundance. The new measurements allowed us to evaluate the sextic centrifugal distortion constants for each isotopomer and vibrational state investigated. The pyrolysis reactions, through which HCCCP and NCCP were produced in situ, also yielded phosphaethyne, HCP, as a by-product. Some transitions of HCP and DCP were recorded in their ground vibrational states along with v2 = 1 vibrational satellites of the former.
- Publication:
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Journal of Molecular Spectroscopy
- Pub Date:
- January 2001
- DOI:
- 10.1006/jmsp.2000.8234
- Bibcode:
- 2001JMoSp.205..110B
- Keywords:
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- submillimeter-wave spectroscopy;
- phosphaalkynes;
- linear molecules