Reinvestigation of microwave spectrum of dimethyl ether and rs structures of analogous molecules

✍ Scribed by Yuzuru Niide; Michiro Hayashi

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 191 KB
• Volume: 220
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1016/s0022-2852(03)00076-6

✦ Synopsis

Microwave spectra of dimethyl ether and its sixteen isotopic species have been measured. For species with singlet spectra, a leastsquares analysis of observed transition frequencies gave rotational and five quartic centrifugal distortion constants. For species with multiplet spectra due to the methyl internal rotation, a least-squares analysis of observed multiplet frequencies gave not only unperturbed rotational and five quartic centrifugal distortion constants but also the quantities related to the methyl internal rotation. The r s structures from ðCH 3 Þ 2 O, CH 3 OCD 3 , and ðCD 3 Þ 2 O species as the parent species, respectively, were compared with one another. The proposed r s structure has been established from all the species measured and was compared with the r s -like structure obtained by a diagnostic least-squares method and with the reported structure. The r s structure of the present molecule was compared with the reported structures of dimethyl sulfide and dimethyl silane in relation to the tilt phenomenon. The r s structure of dimethyl sulfide was revised based on the present comparison.