10.1021/om701297k.s004 Fu-Bin Han Fu-Bin Han Yu-Liang Zhang Yu-Liang Zhang Xiu-Li Sun Xiu-Li Sun Bao-Guo Li Bao-Guo Li Yang-Hui Guo Yang-Hui Guo Yong Tang Yong Tang Synthesis and Characterization of Pyrrole-imine [N<sup>−</sup>NP] Nickel(II) and Palladium(II) Complexes and Their Applications to Norbornene Polymerization American Chemical Society 2008 halogen atoms NP complexes 1 MMAO vinyl addition polymerization PNB 2008-04-28 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Synthesis_and_Characterization_of_Pyrrole_imine_N_sup_sup_NP_Nickel_II_and_Palladium_II_Complexes_and_Their_Applications_to_Norbornene_Polymerization/2942617 Ni(II) and Pd(II) complexes based on <i>N</i>-((1<i>H</i>-pyrrol-2-yl)methylene)-2-(diphenylphosphino)benzenamine were synthesized and characterized. X-ray diffraction studies on complexes <b>1</b>, <b>2</b>,<b></b> and <b>4</b> revealed that N, N, P, and halogen atoms coordinated to metal, with distorted square planar geometries in all cases. Upon treatment with modified methylaluminoxane (MMAO), the [N<sup>−</sup>NP]Ni(II)X complexes are robust and exhibit high activity for the vinyl addition polymerization of norbornene (up to 5.46 × 10<sup>7</sup> g PNB/mol(Ni)·h·atm).