Two 2-Py-amidine ligands (2-Py-NH-C(Ph) N-Ar, Ar = 2,6-Me 2 C 6 H 3 and 2,6-i Pr 2 C 6 H 3 ) and the corresponding Ni(II) complexes (1 and 2) were synthesized and characterized using elemental analysis and FT-IR, UV-visible, 1 H NMR and 13 C NMR spectroscopies. X-ray crystal structures indicate that the chelate ring conformation of the less bulky complex 1 is relatively planar compared with that of the bulky complex 2. Paramagnetic 1 H NMR and 13 C NMR studies show that, in solution, the time-average structures of complexes 1 and 2 have mirror symmetry. Both complexes 1 and 2 were used as catalyst precursors for norbornene polymerization with methylaluminoxane as a co-catalyst. The effects of Al/Ni ratio, temperature and structure of precursors on the catalytic performance were investigated.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.