Synthesis and characterization of lithium, aluminium and zinc complexes supported by pyrazolyl-based N,N′-chelate ligands
作者:Can Jin、Zhong-Xia Wang
DOI:10.1039/b811094h
日期:——
A series of lithium, aluminium and zinc complexes bearing [3,5-R2C3HN2CHC(R1)N(R2)]â ligands were synthesized and characterized. Treatment of 1-(Me3SiCH2)-3,5-R2C3HN2 (R = Me, But) with LiBun and then ButCN afforded [LiN(SiMe3)C(But)CHN2C3HR2-3,5}]2 (R = Me, 2a; R = But, 2b). Reaction of both 2a and 2b with ZnCl2 gave zinc complexes [Zn(Cl)N(SiMe3)C(But)CHN2C3HR2-3,5}]2 (R = Me, 3a; R = But, 3b). Treatment of o-RC6H4NHC(Ph)CHN2C3HMe2-3,5 (R = OPri, 5a; R = Me, 5b) with LiBun yielded lithium complexes similar to 2a or 2b, [LiN(o-RC6H4)C(Ph)CHN2C3HMe2-3,5}] (R = OPri, 6a; R = Me, 6b). Reaction of 6b with ZnCl2 generated zinc complexes [Zn(Cl)N(o-MeC6H4)C(Ph)CHN2C3HMe2-3,5}] (7), and with AlCl3 gave [Al(Cl2)N(o-MeC6H4)C(Ph)CHN2C3HMe2-3,5}] (8). Reaction of 5a with ZnEt2 produced [ZnN(o-PriC6H4)C(Ph)CHN2C3HMe2-3,5}2] (9). Reaction of 5a and 5b with AlRâ²3 (Râ² = Me, Et) afforded aluminium complexes [Al(Râ²2)N(o-RC6H4)C(Ph)CHN2C3HMe2-3,5}] (R = OPri, Râ² = Me, 10a; R=Me, Râ² = Me, 10b; R = OPri, Râ² = Et, 10c; R = Me, Râ² = Et, 10d). A trace of species [Al(Et2)N(o-MeC6H4)C(Ph)(Et)CH2N2C3HMe2-3,5}] (11) was also isolated from the reaction products of 5b and AlEt3. All of new compounds were characterized by 1H and 13C NMR spectroscopy and elemental analyses. Structures of complexes 2a, 8, 10a, 10d and 11 were additionally characterized by single-crystal X-ray diffraction techniques.
一系列含有 [3,5-R2C3HN2CHC(R1)N(R2)]− 配体的锂、铝和锌配合物被合成并表征。将 1-(Me3SiCH2)-3,5-R2C3HN2 (R = Me, But) 与 LiBun 反应,随后与 ButCN 反应,得到 [LiN(SiMe3)C(But)CHN2C3HR2-3,5}]2(R = Me,2a;R = But,2b)。将 2a 和 2b 与 ZnCl2 反应,得到锌配合物 [Zn(Cl)N(SiMe3)C(But)CHN2C3HR2-3,5}]2(R = Me,3a;R = But,3b)。将 o-RC6H4NHC(Ph)CHN2C3HMe2-3,5(R = OPri,5a;R = Me,5b)与 LiBun 反应,得到类似于 2a 或 2b 的锂配合物,[LiN(o-RC6H4)C(Ph)CHN2C3HMe2-3,5}](R = OPri,6a;R = Me,6b)。将 6b 与 ZnCl2 反应,生成锌配合物 [Zn(Cl)N(o-MeC6H4)C(Ph)CHN2C3HMe2-3,5}](7),与 AlCl3 反应,得到 [Al(Cl2)N(o-MeC6H4)C(Ph)CHN2C3HMe2-3,5}](8)。将 5a 与 ZnEt2 反应,生成 [ZnN(o-PriC6H4)C(Ph)CHN2C3HMe2-3,5}2](9)。将 5a 和 5b 与 AlR′3(R′ = Me, Et)反应,得到铝配合物 [Al(R′2)N(o-RC6H4)C(Ph)CHN2C3HMe2-3,5}](R = OPri,R′ = Me,10a;R = Me,R′ = Me,10b;R = OPri,R′ = Et,10c;R = Me,R′ = Et,10d)。在 5b 和 AlEt3 的反应产物中还分离出少量物种 [Al(Et2)N(o-MeC6H4)C(Ph)(Et)CH2N2C3HMe2-3,5}](11)。所有新化合物都通过 1H 和 13C NMR 光谱和元素分析进行了表征。配合物 2a、8、10a、10d 和 11 的结构还通过单晶 X 射线衍射技术进行了表征。