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