Microwave Spectrum of gauche-Ethyl Selenocyanate

✍ Scribed by T. Sakaizumi; T. Itakura

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 306 KB
• Volume: 163
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1994.1001

✦ Synopsis

The microwave spectra of ethyl selenocyanate. (\mathrm{CH}{3} \mathrm{CH}{2} \mathrm{SeCN}) ( ({ }^{80} \mathrm{Se}) and ({ }^{78} \mathrm{Se}) species), have been observed in the frequency range from 8000 to (27000 \mathrm{MHz}). The rotational constants are determined to be (A=3922.92(18), B=2898.00(8)), and (C=1789.82(2) \mathrm{MHz}) for ({ }^{80}) Se species and (A=3960.25(28), B=2898.17(13)), and (C=1796.27(2) \mathrm{MHz}) for ({ }^{78}) Se species. Only one rotational isomer was identified as having the synclinal (gatuche) form. The dihedral angle is found to be about (59^{\circ}) from the synperiplanar (cis) position. The dipole moments of this rotamer are determined to be (\mu_{a}=4.37(10), \mu_{b}=0.80(5), \mu_{c}=0.50(5)), and (\mu_{\text {total }}=4.47(10) D) for the ({ }^{87}) Se species. The rotational conformer of ethyl selenocyanate was similar to that of ethyl thiocyanate hut was different from that of ethyl cyanate. (c) 1994 Academic Press. Inc.