Zusammenfassung
Ambident cyanopyridine ligands form N(pyridine) and N'(nitrile) coordinated mono- and binuclear complexes with the (C5H4Me)(CO)2Mn (C5H5 = cyclopentadienyl) fragment. All 3 possible forms for 4-cyanopyridine were isolated, whereas mononuclear compds. were obtained as most stable species in N1-coordinated form with 3-cyanopyridine and in CN2-coordinated form with the 2-isomer. IR, NMR, and UV/VIS spectroscopy as well as electrochem. and ESR spectroscopy of the anion radicals demonstrate superior p back-bonding via the pyridine N centers; the isolation of nitrile coordinated complexes is attributed to the kinetic stability of the CN-Mn bond. A neutral binuclear complex was isolated with the stronger p-acceptor, tetrafluoroterephthalonitrile. [on SciFinder(R)]
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