Show simple item record

dc.creatorGedanken, Aharonen_US
dc.creatorSchnepp, O.
dc.date.accessioned2006-06-15T13:36:17Z
dc.date.available2006-06-15T13:36:17Z
dc.date.issued1975en_US
dc.identifier1975-FD-01en_US
dc.identifier.urihttp://hdl.handle.net/1811/9238
dc.descriptionAuthor Institution: Department of Chemistry, University of Southern Californiaen_US
dc.description.abstractThe circular dichroism of dimethyl cyclopropane and the magnetic circular dichroism of cyclopropane were measured in the vacuum ultraviolet spectral region (1950--1400 $\dot{A}$). The absorption spectrum of cyclopropane exhibits two types of transitions; “forbidden” transitions in the spectral region of 1950--1700 \AA ($\epsilon \sim 0.1 - 1$) and allowed transitions having $\epsilon \sim 4000$ at 1700-1400 \AA. The Lowest excited states in cyclopropane resulting from the configuration (3a$_{1}$)$^{2} (\le^{\prime\prime})^{4} (3e^{\prime})^{3}$ (4e$^{\prime\prime})^{1}$ belong to the representations $A_{1}^{\prime}$, $A_{2}^{\prime}$, and $E^{\prime}$ of point group $D_{3{h}}$. Only the transition to the latter state is electric dipole allowed from the ground state. The CD spectrum of dimethyl cyclopropane reveals a broad negative band peaking at 1845 {\AA} that does not have any corresponding band in the absorption. The large g value $({g} = \frac{\Delta\epsilon}{\epsilon})$ of this transition leads to an unambiguous assignment of this band to a ground state $\rightarrow$ $A_{2}^{\prime}$ magnetic dipole allowed transition. We are able to assign the second forbidden state $A_{1}^{\prime}$. This state is both magnetic and electric dipole forbidden and this fact accounts for the non-appearance in the CD spectrum of the absorption bands assigned to this state. The MCD spectrum of cyclopropane will be explained in terms of ``A” and “B” terms. Two allowed degenerate valence excited states ($E^{\prime}$ symmetry) were found in the investigated region. The assignment of these states is supported by theoretical calculations of the corresponding A-term parameters.en_US
dc.format.extent157966 bytes
dc.format.mimetypeimage/jpeg
dc.language.isoEnglishen_US
dc.publisherOhio State Universityen_US
dc.titleTHE CIRCULAR DICHROISM AND MAGNETIC CIRCULAR DICHROISM OF CYCLOPROPANEen_US
dc.typearticleen_US


Files in this item

Thumbnail

Items in Knowledge Bank are protected by copyright, with all rights reserved, unless otherwise indicated.

This item appears in the following Collection(s)

Show simple item record