Microwave measurements of maleimide and its doubly hydrogen bonded dimer with formic acid

Pejlovas, Aaron M.

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https://hdl.handle.net/2142/91057 Copy

Description

Title

Microwave measurements of maleimide and its doubly hydrogen bonded dimer with formic acid

Author(s)

Pejlovas, Aaron M.

Contributor(s)

• Kukolich, Stephen G.
• Kang, Lu

Issue Date

2016-06-21

Keyword(s)

Spectroscopy of Large Amplitude Motions

Abstract

\begin{wrapfigure}{r}{0pt} \includegraphics[scale=0.26]{malfa.eps} \end{wrapfigure} The microwave spectra were measured for the maleimide monomer and the maleimide-formic acid doubly hydrogen bonded dimer using a pulsed-beam Fourier transform microwave spectrometer. Many previously studied doubly hydrogen bonded dimers are formed between oxygen containing species, so it is important to also characterize and study other dimers containing nitrogen, as hydrogen bonding interactions with nitrogen are found in biological systems such as in DNA. The transition state of the dimer does not exhibit C$_2$$_V$ symmetry, so the tunneling motion was not expected to be observed based on the symmetry, but it would be very important to also observe the tunneling process for an asymmetric dimer. Single-line b-type transitions were observed, so the tunneling motion was not observed in our microwave spectra. The hydrogen bond lengths were determined using a nonlinear least squares fitting program.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

En

Permalink

http://hdl.handle.net/2142/91057

Sponsor(s)/Grant Number(s)

\begin{wrapfigure}{r}{0pt} \includegraphics[scale=0.26]{malfa.eps} \end{wrapfigure} The microwave spectra were measured for the maleimide monomer and the maleimide-formic acid doubly hydrogen bonded dimer using a pulsed-beam Fourier transform microwave spectrometer. Many previously studied doubly hydrogen bonded dimers are formed between oxygen containing species, so it is important to also characterize and study other dimers containing nitrogen, as hydrogen bonding interactions with nitrogen are found in biological systems such as in DNA. The transition state of the dimer does not exhibit C$_2$$_V$ symmetry, so the tunneling motion was not expected to be observed based on the symmetry, but it would be very important to also observe the tunneling process for an asymmetric dimer. Single-line b-type transitions were observed, so the tunneling motion was not observed in our microwave spectra. The hydrogen bond lengths were determined using a nonlinear least squares fitting program. \linebreak \\ Supported by the NSF CHE-1057796

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Copyright 2016 by the authors

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