The nature of nickel(II) species, formed upon the activation of α-diiminonickel pre-catalyst L_NNi^IIBr₂ (L_N = 1,2-Bis[(2,4,6-trimethylphenyl)imino]acenaphthene) with Al₂Et₃Cl₃ and Al₂Me₃Cl₃, has been studied using ¹H and ²H NMR spectroscopy. The paramagnetic heterobinuclear ion pairs of the type [L_NNi^II(μ-Cl)₂AlRCl]⁺[A]^– (where R = Et or Me, [A]^- = counter anion) have been observed in the catalyst systems L_NNi^IIBr₂/Al₂Et₃Cl₃ and L_NNi^IIBr₂/Al₂Me₃Cl₃. At room temperature, both ion pairs gradually transform into EPR-active complexes of Ni(I). Their possible role in ethylene polymerization is discussed.

镍（II）物种的性质，是由α-二 亚氨基酮基前催化剂L _N Ni ^II Br ₂（L _N = 1,2-Bis [（2,4,6-三甲基苯基）亚氨基] ac）活化而形成的使用¹ H和² H NMR光谱研究了Al ₂ Et ₃ Cl ₃和Al ₂ Me ₃ Cl ₃。[L _N Ni ^II（μ- Cl）₂ AlRCl] ⁺ [A] ^–型（其中R = Et或Me，[A] ^- 在催化剂体系L _N Ni ^II Br ₂ / Al ₂ Et ₃ Cl ₃和L _N Ni ^II Br ₂ / Al ₂ Me ₃ Cl _3中观察到。在室温下，两个离子对逐渐转变为Ni（I）的EPR活性络合物。讨论了它们在乙烯聚合中的可能作用。