Accession Number : AD0636388

Title :   PARAMAGNETISM OF CARBAZYL AND HYDRAZYL RADICALS.

Descriptive Note : Final rept.

Corporate Author : SANTA CLARA UNIV CALIF DEPT OF PHYSICS

Personal Author(s) : Duffy,W. , Jr. ; Strandburg,D. L.

Report Date : 1966

Pagination or Media Count : 27

Abstract : Static magnetic susceptibility measurements in the temperature range 1.4-300K are reported on powder samples of the stable aromatic free radicals Picryl-n-aminocarbazyl (PAC), 2,2-Diphenyl-1-picryl-hydrazyl in the 106C m.p. (DPPH I) and 137C m.p. (DPPH II) crystal modifications, 2-Phenyl-2-p-nitrophenyl-1-picrylhydrazyl (DHNO2.) and 2,2-Bis-p-nitrophenyl-1-picrylhydrazyl (D(NO2)2.). Radical concentrations in the range from 0.81 to 0.99 and Weiss constants in the range -36K to -5.2K were determined. The measurements were interpreted assuming that the magnetic behavior is due to alternating antiferromagnetic exchange-coupled linear chains. Exchange integrals were inferred from fitting theoretical curves to the susceptibility maxima. Evidence is presented for the presence of random dilution by diamagnetic sites in PAC. (Author)

Descriptors :   (*FREE RADICALS, *PARAMAGNETISM), (*ORGANIC NITROGEN COMPOUNDS, MAGNETIC PROPERTIES), AROMATIC COMPOUNDS, CRYOGENICS, CRYSTALS, ANTIFERROMAGNETISM, INTEGRALS

Subject Categories : Physical Chemistry
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE