In:
Canadian Journal of Chemistry, Canadian Science Publishing, Vol. 60, No. 12 ( 1982-06-15), p. 1392-1401
Abstract:
A series of spin-labeled copper porphyrins has been prepared in which nitroxyl radicals are attached to a porphyrin pyrrole ring by propionamide and propionate ester linkages. The solution epr spectra at room temperature indicate that the values of the electron spin – electron spin coupling constant, J, for these compounds are in the range 4 to 18 G, depending on the solvent and the size of the nitroxyl ring. Below −45 °C two isomers with different values of J were observed in the epr spectra of two of the compounds. Variable temperature epr spectra were also analyzed for analogous spin-labeled copper porphyrins which have cis and trans acrylic ester and acrylamide linkages between the porphyrin and the nitroxyl ring. Comparison of the values of J for the complexes with saturated and unsaturated linkages suggests that σ-bonding pathways dominate the copper–nitroxyl interaction in these compounds.
Type of Medium:
Online Resource
ISSN:
0008-4042
,
1480-3291
Language:
English
Publisher:
Canadian Science Publishing
Publication Date:
1982
detail.hit.zdb_id:
1482256-8
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