DIPOLE MOMENTS OF THE LOWEST $\pi^{*}\leftarrow\pi^{*}$ STATES OF THE ISOELECTRONIC SERIES PHENYLACETYLENE, PHENYLISOCYANIDE, BENZONITRILE
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Date
1970
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Ohio State University
Abstract
Stark effects have been obsrved in the rotational fine structure of the lowest singlet $\pi^{*}\leftarrow\pi$ transitions in the molecules phenylacetylene, benzonitrile, phenylisocyanide (2787 \AA, 2738 \AA, 2723 \AA. respectively). From these observations the change in dipole moment on excitation can be determined. It is found that the order of increasing change is phenylacetylene, phenylisocyanide, benzonitrile. This is also the order of increasing change in the mean bond lengths parallel to the symmetry axis. Since the molecules form an isoelectronic series, correlations can be made with various resonance models for the electronic structure of the excited state.
Description
Author Institution: Department of Chemistry, University of Illinois