A series of Ni complexes supported by SNO Schiff-base derivatives were synthesized in this study. Complex synthesis and characterization data are reported herein. Treatment of the pro-ligands [L¹-H = 2-(((2-(methylthio)ethyl)imino)methyl)phenol, L²-H = 2,4-di-tert-butyl-6-(((2-(methylthio)ethyl)imino)methyl)phenol, L³-H = 2-(((2-(methylthio)ethyl)imino)methyl)-4,6-bis(2-phenylpropan-2-yl)phenol, L⁴-H = 4-bromo-2-(((2-(methylthio)ethyl)imino)methyl)phenol, and L⁵-H = 4-chloro-2-(((2-(methylthio)ethyl)imino)methyl)phenol] with Ni(OAc)₂·4H₂O in refluxing ethanol afforded six-coordinate mono-Ni(II) complexes [L₂ⁿNi] (n = 1–5). Noteworthy, a heptanuclear nickel(II) octacarboxylate species complex 6 and dinuclear nickel complex 6a resulted from treatment of L⁶-H [4-fluoro-2-(((2-(methylthio)ethyl)imino)methyl)phenol] with different metal precursors [Ni(OAc)₂·4H₂O for 6; NiBr₂ for 6a] giving a quantitative yield. The reaction of nickel acetate tetrahydrate and L⁷-H to L⁹-H [L⁷-H = 2-methoxy-6-(((2-(methylthio)ethyl)imino)methyl)phenol, L⁸-H = 5-methoxy-2-(((2-(methylthio)ethyl)imino)methyl)phenol, and L⁹-H = 4-methoxy-2-(((2-(methylthio)ethyl)imino)methyl)phenol] produced the four-coordinate complexes [L₂ⁿNi] (n = 7–9). The highest performing catalyst was complex 3, which was highly efficient for the ring-opening copolymerization of phthalic anhydride (PA) and cyclohexene oxide (CHO) in the presence of a cocatalyst (4-dimethylaminopyridine). In addition, the same copolymerization conditions produced narrowly dispersed polyesters, with high selectivity and polymerization control. In addition to PA–CHO copolymerization, efficient diglycolic anhydride–PA and PA–propene oxide copolymerization was achieved under the same conditions. These catalysts are straightforward to produce and extend the scope of potential substrates.

中文翻译：

---

结构明确且高效的镍催化剂与三齿 SNO 席夫碱衍生物配合用于环氧化物和酸酐的交替共聚

本研究合成了一系列由 SNO 席夫碱衍生物支持的 Ni 配合物。本文报告了复杂的合成和表征数据。处理前配体 [L ¹ -H = 2-(((2-(甲硫基)乙基)亚氨基)甲基)苯酚，L ² -H = 2,4-二叔丁基-6-((( 2-(甲硫基)乙基)亚氨基)甲基)苯酚，L ³ -H = 2-(((2-(甲硫基)乙基)亚氨基)甲基)-4,6-双(2-苯基丙基-2-基)苯酚, L ⁴ -H = 4-溴-2-(((2-(甲硫基)乙基)亚氨基)甲基)苯酚，和 L ⁵ -H = 4-氯-2-(((2-(甲硫基)乙基)亚氨基)甲基)苯酚]与Ni(OAc) ₂ ·4H ₂ O在回流乙醇中得到六配位单-Ni(II)络合物[L ₂nNi ] ( ⁿ = 1–5)。值得注意的是，L 6 -H [ ^{4 -} fluoro -2-(((2-(methylthio)ethyl)imino)methyl)phenol] 用不同金属前体[Ni(OAc) ₂ ·4H ₂ O for 6; 6a的NiBr ₂ ]给出了定量收率。四水乙酸镍与L ⁷ -H反应生成L ⁹ -H [L ⁷ -H = 2-methoxy-6-(((2-(methylthio)ethyl)imino)methyl)phenol, L ⁸ -H = 5 -甲氧基-2-(((2-(甲硫基)乙基)亚氨基)甲基)苯酚，和L ⁹-H = 4-methoxy-2-(((2-(methylthio)ethyl)imino)methyl)phenol] 产生四配位络合物 [L ₂ ⁿ Ni] ( n = 7–9)。性能最高的催化剂是配合物3，它在助催化剂（4-二甲基氨基吡啶）存在下对邻苯二甲酸酐 (PA) 和环己烯氧化物 (CHO) 的开环共聚非常有效。此外，相同的共聚条件产生窄分散的聚酯，具有高选择性和聚合控制。除了 PA-CHO 共聚外，在相同条件下还实现了高效的二甘醇酸酐-PA 和 PA-环氧丙烷共聚。这些催化剂易于生产并扩展了潜在底物的范围。