19F-NMR studies of the nickel catalyst system

Ni(naph)2-Al (i-Bu)3-BF3OEt2 (abbr. Ni-Al-B)

has been tested. In Ni-B system contained "F-B-Ni" complex

19F chemical shift moves to downfield from-153.55 ppm to -148.85ppm

because of the magnetic diploe-dipole interaction between unpaired eelectrons in the 3d8 orbital of N1(II) and fluorine nucleus as a ligand bonded with Ni(II). In B-A1 system the value of coupling constant 1JE-A1 was measured to be equal to 19.2 Hz

the over range of 19F is about from -145 pp

to -155 ppm. And in the real nickel catalyst system

one of 19F resonances is from -135 ppm to -136 ppm at the downfield

which might be assigned to the resonance of fluorine-bridged nucleus on the bimeta-lic complexes

such as due to the presence of dipole-dipole interaction between Ni(I) and Fnuclei

which has been identified by the equation.