%0 Journal Article %1 Heilmann.1996b %A Heilmann, Martina %A Baumann, Frank %A Kaim, Wolfgang %A Fiedler, Jan. %D 1996 %J Journal of the Chemical Society, Faraday Transactions %K ESR azobispyridine bipyridine configurational electrochem electron hopping isomer;ESR isomer;electron isomer;ruthenium redn ruthenium %N 21 %P 4227--4231 %R 10.1039/ft9969204227 %T Configuration-dependent electron hopping between equivalent ligands in isomeric ruthenium(II) complexes %V 92 %X The three configurational isomers of (bpy)Ru(abpy)22+, bpy = 2,2'-bipyridine and abpy = 2,2-azobis(pyridine), were identified via 1H NMR spectroscopy and crystal structure information from precursor complexes. One-electron redn. introduces a single electron which can undergo site-exchange ('hopping') between the two equiv. abpy ligands in (bpy)RuII(abpy-1)(abpy0).bul.+. EPR line broadening at higher temps. indicates a slow-exchange situation which is most pronounced for the cct (a1) isomer with the coordinated azo groups in trans configuration; the EPR signal was broadened beyond recognition at temps. \textgreater220 K. A less unusual behavior was obsd. for the ccc (b) and the new ctc (a2) isomer, both with the coordinated azo functions in cis-positions. on SciFinder(R)

@article{Heilmann.1996b, abstract = {The three configurational isomers of [(bpy)Ru(abpy)2]2+, bpy = 2,2'-bipyridine and abpy = 2,2-azobis(pyridine), were identified via 1H NMR spectroscopy and crystal structure information from precursor complexes. One-electron redn. introduces a single electron which can undergo site-exchange ('hopping') between the two equiv. abpy ligands in [(bpy)RuII(abpy-1)(abpy0)].bul.+. EPR line broadening at higher temps. indicates a slow-exchange situation which is most pronounced for the cct (\textgreek{a}1) isomer with the coordinated azo groups in trans configuration; the EPR signal was broadened beyond recognition at temps. {\textgreater}220 K. A less unusual behavior was obsd. for the ccc (\textgreek{b}) and the new ctc (\textgreek{a}2) isomer, both with the coordinated azo functions in cis-positions. [on SciFinder(R)]}, added-at = {2022-06-15T11:26:56.000+0200}, author = {Heilmann, Martina and Baumann, Frank and Kaim, Wolfgang and Fiedler, Jan.}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/2fd4b7e4a4cfaefcbe7aec386c2dcd115/huebleriac}, doi = {10.1039/ft9969204227}, interhash = {aeb1fb08a98c782bac34ed3dca1ad980}, intrahash = {fd4b7e4a4cfaefcbe7aec386c2dcd115}, issn = {0956-5000}, journal = {Journal of the Chemical Society, Faraday Transactions}, keywords = {ESR azobispyridine bipyridine configurational electrochem electron hopping isomer;ESR isomer;electron isomer;ruthenium redn ruthenium}, number = 21, pages = {4227--4231}, timestamp = {2022-06-15T09:26:56.000+0200}, title = {Configuration-dependent electron hopping between equivalent ligands in isomeric ruthenium(II) complexes}, volume = 92, year = 1996 }