Paramagnetic complexes of nickel(I) stabilized by norbornadiene

Research paper by V. R. Flid, O. S. Manulik, L. M. Grundel', A. P. Belov

Indexed on: 01 Jul '91Published on: 01 Jul '91Published in: Theoretical and Experimental Chemistry


Nickel(I) compounds whose concentration was 10−4–10−6 of the total concentration of nickel added to the system were identified by EPR in the reaction of 2,5-norbornadiene with nickel homoligand allyl complexes Niall2 (all is C3H5, 1-CH3C3H4, or 2-CH3C3H4). The Ni(I) complexes were stable at room temperature under oxygen-free conditions. It was shown that the paramagnetic complexes were in equilibrium with diamagnetic forms. The temperature dependence of the concentration of the paramagnetic species was determined. The structure of the paramagnetic nickel(I) complexes and the possible routes of their formation are discussed on the basis of the obtained data.