%0 Journal Article %1 Sarkar.2004 %A Sarkar, Biprajit %A Frantz, Stephanie %A Kaim, Wolfgang %A Duboc, Carole. %D 2004 %J Dalton Transactions %K EPR EPR;ruthenium bridge polypyridine prepn radical rhenium tetrazine %N 21 %P 3727--3731 %R 10.1039/b407611g %T High-frequency EPR study of reduced diruthenium and dirhenium polypyridine complexes based on the 1,2,4,5-tetrazine radical bridge %X The radical complexes (μ-L)[Ru(bpy)2]2.bul.3+, (μ-bmtz)[Ru(cym)Cl]2.bul.+ and (μ-L)[Re(CO)3Cl]2.bul.-, where L are 3,6-disubstituted 1,2,4,5-tetrazines such as 3,6-bis(2-pyrimidyl)-1,2,4,5-tetrazine (bmtz) and p-cymene (cym), were studied by X-band EPR in fluid soln. and by 285 GHz EPR in glassy frozen soln. A comparison with other transition metal complexes (Cu, Rh, Os, Ir, Pt) involving tetrazine radical ligands reveals that the g anisotropy reflects (i) the p acceptor effect of the tetrazine substituents, (ii) the competition from ancillary p acceptor ligands for back donation from the metal, and (iii) the spin-orbit coupling contributions from the transition metal. [on SciFinder(R)]

@article{Sarkar.2004, abstract = {The radical complexes {(μ-L)[Ru(bpy)2]2}.bul.3+, {(μ-bmtz)[Ru(cym)Cl]2}.bul.+ and {(μ-L)[Re(CO)3Cl]2}.bul.-, where L are 3,6-disubstituted 1,2,4,5-tetrazines such as 3,6-bis(2-pyrimidyl)-1,2,4,5-tetrazine (bmtz) and p-cymene (cym), were studied by X-band EPR in fluid soln. and by 285 GHz EPR in glassy frozen soln. A comparison with other transition metal complexes (Cu, Rh, Os, Ir, Pt) involving tetrazine radical ligands reveals that the g anisotropy reflects (i) the \textgreek{p} acceptor effect of the tetrazine substituents, (ii) the competition from ancillary \textgreek{p} acceptor ligands for back donation from the metal, and (iii) the spin-orbit coupling contributions from the transition metal. [on SciFinder(R)]}, added-at = {2022-06-15T11:26:56.000+0200}, author = {Sarkar, Biprajit and Frantz, Stephanie and Kaim, Wolfgang and Duboc, Carole.}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/2f936397ced1169ef45dda5f08e02ff8b/huebleriac}, doi = {10.1039/b407611g}, interhash = {da90e6d381dd753bfb5e6a4b06a6f80d}, intrahash = {f936397ced1169ef45dda5f08e02ff8b}, issn = {1477-9226}, journal = {Dalton Transactions}, keywords = {EPR EPR;ruthenium bridge polypyridine prepn radical rhenium tetrazine}, number = 21, pages = {3727--3731}, timestamp = {2022-06-15T09:26:56.000+0200}, title = {High-frequency EPR study of reduced diruthenium and dirhenium polypyridine complexes based on the 1,2,4,5-tetrazine radical bridge}, year = 2004 }