ChemInform Abstract: EPR and ENDOR Spectroscopy Studies on α-Aminoanthraquinone Radical Cations in Solution

Autor:	Mikko Vuolle, Jussi Eloranta, Virpi Vatanen
Rok vydání:	2010
Předmět:	General Medicine Electrolyte Medicinal chemistry law.invention Solvent chemistry.chemical_compound chemistry Radical ion law Trifluoroacetic acid Hydrogen–deuterium exchange Acetonitrile Benzene Electron paramagnetic resonance
Zdroj:	ChemInform. 30
ISSN:	1522-2667 0931-7597
DOI:	10.1002/chin.199909027
Popis:	EPR and ENDOR spectra of the radical cations of 1,4-diamino-9,10-anthraquinone, 1,4-bis(methylamino)9,10-anthraquinone, 1,4-bis(ethylamino)-9,10-anthraquinone, 1,4-bis(butylamino)-9,10-anthraquinone and 1,4-bis(hexylamino)-9,10-anthaquinone were measured in 1,1,1,3,3,3-hexafluoropropan-2-ol (HFP), with (bis(trifluoroacetoxy)iodo)benzene (PIFA) as oxidizing agent, in the temperature range 260–300 K. The isotropic hyperfine coupling constants (hcc) of the labile amino protons were assigned by deuterium exchange with deuterated trifluoroacetic acid (d-TFA) in HFP as solvent. The results are compared with the radical cations of 1,4-diamino-9,10-anthraquinone and 1,4-bis(methylamino)-9,10-anthraquinone produced in acetonitrile by electrolytic oxidation. A tentative assignment of the hcc constants by MO calculations was made for 1,4-diamino-9,10-anthraquinone. The results indicate that deuteration is restricted entirely to the amino protons and that the obtained radical cation of aminoanthraquinone occurs in the non-protonated form (Q+˙).
Databáze:	OpenAIRE
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