%0 Journal Article %1 Kaim.1991c %A Kaim, Wolfgang %A Moscherosch, Michael. %D 1991 %J Journal of the Chemical Society, Faraday Transactions %K ESR ESR;ESR azodicarboxylic complex complex;isotope copper ester radical %N 19 %P 3185--3187 %R 10.1039/ft9918703185 %T Detection of electron paramagnetic resonance signals from three different isotope combinations 63Cu/63Cu, 63Cu/65Cu and 65Cu/65Cu in stable dicopper(I) radical complexes %V 87 %X The new stable paramagnetic cations (R'R2P)2Cu(adcOR'')Cu(PR2R')2+, adcOR'' = azodicarboxylic ester, have been characterized by high-resoln. EPR spectroscopy. Two equiv. copper centers within one mol. give rise to isotope combinations 63Cu/63Cu (47.9\%), 63Cu/65Cu (42.6\%) and 65Cu/65Cu (9.5\%); both isotopes have I = 3/2, but the nuclear magnetic moment is 7.1\% higher for 65Cu. A theor. anal. of the hyperfine splitting pattern, including a stick spectrum and actual computer simulations, is given, and exptl. spectra could be successfully reproduced in this way. Factors favoring the detection of individual isotope combination lines, particularly in the outer spectral regions, are the small no. of coupling nuclei (14N, 31P) in the ligands, the rather narrow EPR lines of these ligand-centered radical complexes and the relatively large isotropic copper coupling consts. of ca. 1.6 mT. on SciFinder(R)

@article{Kaim.1991c, abstract = {The new stable paramagnetic cations [(R'R2P)2Cu(adcOR'')Cu(PR2R')2]+, adcOR'' = azodicarboxylic ester, have been characterized by high-resoln. EPR spectroscopy. Two equiv. copper centers within one mol. give rise to isotope combinations 63Cu/63Cu (47.9{\%}), 63Cu/65Cu (42.6{\%}) and 65Cu/65Cu (9.5{\%}); both isotopes have I = 3/2, but the nuclear magnetic moment is 7.1{\%} higher for 65Cu. A theor. anal. of the hyperfine splitting pattern, including a stick spectrum and actual computer simulations, is given, and exptl. spectra could be successfully reproduced in this way. Factors favoring the detection of individual isotope combination lines, particularly in the outer spectral regions, are the small no. of coupling nuclei (14N, 31P) in the ligands, the rather narrow EPR lines of these ligand-centered radical complexes and the relatively large isotropic copper coupling consts. of ca. 1.6 mT. [on SciFinder(R)]}, added-at = {2022-06-15T11:26:56.000+0200}, author = {Kaim, Wolfgang and Moscherosch, Michael.}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/2401a5a61dd4abf09ddc2613a6ff2c595/huebleriac}, doi = {10.1039/ft9918703185}, interhash = {76bfcaa8f2776c403cab2fc55f99b0c9}, intrahash = {401a5a61dd4abf09ddc2613a6ff2c595}, issn = {0956-5000}, journal = {Journal of the Chemical Society, Faraday Transactions}, keywords = {ESR ESR;ESR azodicarboxylic complex complex;isotope copper ester radical}, number = 19, pages = {3185--3187}, timestamp = {2022-06-15T09:26:56.000+0200}, title = {Detection of electron paramagnetic resonance signals from three different isotope combinations 63Cu/63Cu, 63Cu/65Cu and 65Cu/65Cu in stable dicopper(I) radical complexes}, volume = 87, year = 1991 }