FOURIE TRANSFORM MICROWAVE SPECTRUM OF DIMETHYL ETHER DIMER
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Date
2001
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Publisher
Ohio State University
Abstract
The microwave spectrum of dimethyl ether dimer $(DME)_{2}$ has been observed using a Fourie transform microwave spectrometer at Shizuoka University from 5 to 18 GHz. The sample of 1% dimethyl ether in Ar was used to form the complex in a super sonic expansion. Sets of characteristic triplet lines with similar spectroscopic properties were found and assigned to be the $J = 4\leftarrow 3$, $J = 5\leftarrow 4$, and $J = 6\leftarrow 5$ transitions of $(DME)_{2}$. The microwave spectrum of the six isotopomers $(DME)_{2}$, $(DME-d_{6})_{2}$, $(DME-^{13}C_{2})_{2}$, $(DME-d_{6})\ldots (DME)$, $(DME-^{13}C_{2})\ldots (DME)$, $(DME)...(DME-^{13}C_{2})$ have been assigned, leading to the precise spectroscopic constants. From the rotational constants of these six isotopomers molecular structure of dimethyl ether dimer was determined, being found to have $C_{s}$ symmetry and to be bound with three $O\ldots HC$ hydrogen bonds.The barrier height to internal rotation of the methyl group has been determined from the observed A-E splitting.
Description
Author Institution: Shizuoka University; Department of Chemistry, Faculty of Science, Shizuoka University