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Electron spin resonance of cycloheptatrienyl. Auxiliary apparatus

Citation

Wood, David Eldon (1964) Electron spin resonance of cycloheptatrienyl. Auxiliary apparatus. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-12062002-152348

Abstract

Part I. The ESR spectra of cycloheptatrienyl (CHT) in several crystalline environments at temperatures ranging from 1.5[degrees] to 300[degrees]K and the methods of sample preparation are described in detail.

The observed spectra are classified as:

(a) High-temperature spectra--eight equally spaced lines with splittings of 3.7 to 4 gauss and intensity ratios 1:7:21:35:35:21:7:1.

(b) Low-temperature spectra-highly anisotropic and different for each environment.

The transitions between (a) and (b) are abrupt, and the transition temperatures are different for each environment.

CHT is a planar regular heptagon with an orbitally degenerate ground state. This degeneracy can be removed by a crystalline electric field. The wave functions, after the degeneracy has been removed, are determined by the crystal field. The Jahn-Teller distortion of the ring and the spin-orbit interaction are probably less than 1 cm[superscript -1].

Part II. The low-temperature ESR system used in the study of CHT is described in detail. A simple and effective zone refiner for organic compounds is described.

Abstract of propositions

1. An extremely versatile low-temperature ESR system is described in detail.

2. The vapor phase photolysis of cyclopropene to produce cyclopropenyl radical (C[subscript 3]H[subscript 3]) for study by ESR is proposed.

3. An experiment to measure the pi-electron spin-orbit interaction in CHT is proposed.

4. It is proposed that magnetic rotation spectroscopy be used to search for the second and third triplet states of benzene.

5. Bitropyl-thiourea inclusion compound is proposed as a novel triplet exciton system.

Item Type:Thesis (Dissertation (Ph.D.))
Degree Grantor:California Institute of Technology
Division:Chemistry and Chemical Engineering
Major Option:Chemistry
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Unknown, Unknown
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1964
Record Number:CaltechETD:etd-12062002-152348
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-12062002-152348
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4803
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:16 Dec 2002
Last Modified:26 Dec 2012 03:12

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