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Electron spin resonance of cycloheptatrienyl. Auxiliary apparatus


Wood, David Eldon (1964) Electron spin resonance of cycloheptatrienyl. Auxiliary apparatus. Dissertation (Ph.D.), California Institute of Technology.


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:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4803
Deposited By: Imported from ETD-db
Deposited On:16 Dec 2002
Last Modified:26 Dec 2012 03:12

Thesis Files

PDF (Wood_de_1964.pdf) - Final Version
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