%0 Journal Article %1 Barra.1999 %A Barra, Anne-Laure %A Brunel, Louis-Claude %A Baumann, Frank %A Schwach, Manuela %A Moscherosch, Michael %A Kaim, Wolfgang. %D 1999 %J Journal of the Chemical Society, Dalton Transactions: Inorganic Chemistry %K ESR complex copper radical %N 21 %P 3855--3857 %T High-frequency (245 GHz) and X-band EPR study of stable dicopper radical complexes %X Stable, readily accessible and in part even structurally established paramagnetic complex cations Cu2(m-h4-BL)L2+$\surd$, BL = bridging ligand, L = Ph2P(CH2)nPPh2 or 2 PPh3, were studied by high-frequency (245 GHz) and X-band EPR spectroscopy. The dicopper(I)/anion radical ligand formulation as opposed to a mixed-valent dimetal description is supported by the high-frequency EPR results which show g components between 2.0220 and 1.9968. The largest (rhombic) g anisotropy Dg was found for the system with BL = azodi-tert-Bu formate and L = Ph2P(CH2)6PPh2, the smallest (axial) Dg splittings for 1,2,4,5-tetrazine-bridged species. There is a clear relation between Dg as obtained from the high-field measurements and the 63,65Cu hyperfine coupling as measured from soln. spectra in the X band. on SciFinder(R)

@article{Barra.1999, abstract = {Stable, readily accessible and in part even structurally established paramagnetic complex cations [Cu2(\textgreek{m}-\textgreek{h}4-BL)L2]+$\surd$, BL = bridging ligand, L = Ph2P(CH2)nPPh2 or 2 PPh3, were studied by high-frequency (245 GHz) and X-band EPR spectroscopy. The dicopper(I)/anion radical ligand formulation as opposed to a mixed-valent dimetal description is supported by the high-frequency EPR results which show g components between 2.0220 and 1.9968. The largest (rhombic) g anisotropy \textgreek{D}g was found for the system with BL = azodi-tert-Bu formate and L = Ph2P(CH2)6PPh2, the smallest (axial) \textgreek{D}g splittings for 1,2,4,5-tetrazine-bridged species. There is a clear relation between \textgreek{D}g as obtained from the high-field measurements and the 63,65Cu hyperfine coupling as measured from soln. spectra in the X band. [on SciFinder(R)]}, added-at = {2022-06-15T11:26:56.000+0200}, author = {Barra, Anne-Laure and Brunel, Louis-Claude and Baumann, Frank and Schwach, Manuela and Moscherosch, Michael and Kaim, Wolfgang.}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/2df1e77bfa2829cc796ffac78c147c1af/huebleriac}, interhash = {b09dc97198fb0c2c4e95b66f68d8abd8}, intrahash = {df1e77bfa2829cc796ffac78c147c1af}, issn = {0300-9246}, journal = {Journal of the Chemical Society, Dalton Transactions: Inorganic Chemistry}, keywords = {ESR complex copper radical}, number = 21, pages = {3855--3857}, timestamp = {2022-06-15T09:26:56.000+0200}, title = {High-frequency (245 GHz) and X-band EPR study of stable dicopper radical complexes}, year = 1999 }