Abstract
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)
Users
Please
log in to take part in the discussion (add own reviews or comments).