Research And Development On Advanced Graphite Materials. Volume XVI - An Electron Spin Resonance Study Of Thermal Decomposition Reactions Of Organic Compounds

Item

Title
Research And Development On Advanced Graphite Materials. Volume XVI - An Electron Spin Resonance Study Of Thermal Decomposition Reactions Of Organic Compounds
Date
1963
Index Abstract
Contrails and DTIC
Photo Quality
Incomplete
Report Number
WADD TR 61-72 Volume 16
Creator
Singer, L. S.
Lewis, I. C.
Corporate Author
Research Laboratory of National Carbon Company Division of Union Carbide Corporation
Laboratory
AF Materials Laboratory
Extent
32
Identifier
AD0414491
AD0414491
Access Rights
OTS
Distribution Classification
1
Contract
AF 33(616)-6915
DoD Project
7350
DoD Task
735002
DTIC Record Exists
No
Distribution Change Authority Correspondence
None
Report Availability
Full text available
Date Issued
1963-06
Abstract
Initial results of an ESR (electron spin resonance) survey of the thermal decomposition and carbonization of pure organic compounds are presented. ESR measurements were performed during pyrolysis in inert polyphenyl solvents to permit observation of resolved hyperfine structure of radical intermediates. The generality of radical formation during carbonization is demonstrated. Detailed investigations were made on the model aromatic hydrocarbons, acenaphthylene, 9,9'-bifluorenyl and 9,9'-bifluorylidene which provide examples of extremes in graphitization behavior. Results are discussed in terms of reaction mechanisms and the nature of radicals in low temperature carbons. Resolved spectra for acenaphthylene and two deuterated analogs are compared. Possible structures for the observed radicals from both acenaphthylene and the bifluorenyl-bifluorylidene system are presented and discussed theoretically in terms of the H. M O. (Hückel Molecular Orbital) method. ESR studies are reported for thermal decomposition of several aromatic diazocompounds. The observed stable radical intermediates are believed to result from further reaction of the initially generated carbene species. Detailed studies of the decomposition of diphenyl methadone suggest the presence of a radical intermediate containing the Φ2Ċ-N< grouping.
Publisher
Wright-Patterson Air Force Base, OH : AF Materials Laboratory, Aeronautical Systems Division, Air Force Systems Command
Provenance
IIT
Type
report
Subject
Graphite
High Temperature
Pyrolysis
Chemical Reactions
Resonance
Organic Nitrogen Compounds
Organic Compounds
Visible Spectra
Spinning (Motion)
Deuterium Compounds
Free Radicals
Organic Solvents
Decomposition
Infrared Spectra
Ultraviolet Spectra
Hyperfine Structure
Polycyclic Compounds
Electrons
Aromatic Compounds
Format
1 online resource