The reaction of 1,4-bis(diisopropylphenyl)-aza-1,4-butadienenickel dibromide (1a) with stoichiometric amounts of
phenyl Grignard or trimethylaluminum affords the purple Ni(I) complexes 1b and 1c, respectively. Single-crystal X-ray
diffraction reveals dinuclear species in the solid state for both
compounds. UV/vis spectroscopy supports this rare oxidation
state of nickel.
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