Electron nuclear double resonance study of the spin-label tanol (tempol) oriented in the inclusion compound 2'-hydroxy-2,4,4,7,4'-pentamethylflavan

Journal Article · Thu Sep 30 04:00:00 EDT 1982 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100217a025· OSTI ID:6441107

Ohzeki, F; Kispert, L D; Arroyo, C; Steffan, M

The nitrogen quadrupole tensor has been determined by ENDOR measurements at -20/sup 0/C for the spin-label tanol (tempol) oriented in the inclusion compound 2'-hydroxy-2,4,4,7,4'-pentamethylflavan. The principal values are equal to +1.46, +0.11, and -1.57 MHz, with the direction of the 1.46-MHz quadrupole coupling lying parallel to the direction of the largest nitrogen hyperfine coupling. The other two quadrupole tensor components do not lie parallel to the remaining nitrogen hyperfine coupling directions nor are the couplings cylindrically symmetric. Two exchangeable protons are observed to be strongly dipolar coupled to the electron. Coupling constants and direction cosines for nine weekly coupled protons were deduced and attempts were made to assign them.

• OSTI ID: 6441107
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 86:20; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
AMINES
AZINES
CLATHRATES
COUPLING CONSTANTS
ELECTRON SPECTRA
ENDOR
HETEROCYCLIC COMPOUNDS
HETEROCYCLIC OXYGEN COMPOUNDS
HYDROXY COMPOUNDS
MAGNETIC RESONANCE
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PIPERIDINES
PYRIDINES
RESONANCE
SPECTRA
STRUCTURAL CHEMICAL ANALYSIS
TENSORS