Paramagnetic products of [Ni (C4H6)2]n interaction with diethylaluminium chloride

ESR method has been used to identify metastable Ni+ complexes in toluene solution formed by the interaction of [Ni(C4H6)2] with Et2AlCl. Reversible changes in the ground state of Ni+ ions after the introduction of supplementary neutral ligands (PPh3, C2H4) into the system have been established.