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Metal Complexes with a Hexadentate Macrocyclic Diamine-Tetracarbene Ligand
Inorganic Chemistry ( IF 4.6 ) Pub Date : 2017-09-21 00:00:00 , DOI: 10.1021/acs.inorgchem.7b01896
Taotao Lu 1 , Chu-Fan Yang 1 , Li-Yi Zhang 2 , Fan Fei 1 , Xue-Tai Chen 1 , Zi-Ling Xue 3
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A hexadentate macrocyclic N-heterocyclic carbene (NHC) ligand precursor (H4L)(PF6)4 containing four benzimidazolium and two secondary amine groups, has been synthesized and characterized. Coordination chemistry of this new macrocyclic diamine-tetracarbene ligand has been studied by the synthesis of its Ag(I), Au(I), Ni(II), and Pd(II) complexes. Reactions of (H4L)(PF6)4 with different equiv of Ag2O result in Ag(I) complexes [Ag(H2L)](PF6)3 (1) and [Ag2(H2L)](PF6)4 (2). A mononuclear Au(I) complex [Au(H2L)](PF6)3 (3) and a trinuclear Au(I) complex [Au3(H2L)(Cl)2](PF6) (4) are obtained by transmetalation of 1 and 2 with AuCl(SMe2), respectively. Reactions of (H4L)(PF6)4 with Ni(OAc)2 and Pd(OAc)2 in the presence of NaOAc yield [Ni(L)](PF6)2 (5) and [Pd(L)](PF6)2 (6), respectively, containing one Ni(II) and Pd(II) ion with distorted square-planar geometry. Using more NaOAc results in the formation of unusual dinuclear complexes [Ni2(L–2H)](PF6)2 (7) and [Pd2(L–2H)](PF6)2 (8) (L–2H = deprotonated ligand after removing two H+ ions from two secondary amine groups in L), respectively, featuring a rare M2N2 core formed by two bridging amides. 7 is also formed by the reaction of 5 with 1.0 equiv of Ni(OAc)2·4H2O in the presence of NaOAc. Transmetalation of 2 with 2.0 equiv of Ni(PPh3)2Cl2 gives [Ni2(L)(μ-O)](PF6)2 (9), the first example of a dinuclear Ni(II) complex with a singly bridging oxo group. 9 is converted to 7 in good yield through the treatment with NaOAc.

中文翻译:

具有六齿大环二胺-四碳烯配体的金属配合物

合成并表征了含有四个苯并咪唑鎓和两个仲胺基的六齿大环N-杂环卡宾(NHC)配体前体(H 4 L)(PF 64。通过合成其Ag(I),Au(I),Ni(II)和Pd(II)配合物,已经研究了这种新的大环二胺-四碳烯配体的配位化学。(H 4 L)(PF 64与不同当量的Ag 2 O反应生成Ag(I)络合物[Ag(H 2 L)](PF 631)和[Ag 2(H 2 L) )](PF 642)。单核Au(I)络合物[Au(H 2 L)](PF 633)和三核Au(I)络合物[Au 3(H 2 L)(Cl)2 ](PF 6)(4)分别通过12与AuCl(SMe 2)的金属转移获得。在NaOAc存在下(H 4 L)(PF 64与Ni(OAc)2和Pd(OAc)2的反应产生[Ni(L)](PF 625)和[Pd(L) ](PF626)分别包含一种Ni-II和Pd(II)离子,它们具有扭曲的方平面几何形状。使用更多的NaOAc会导致形成异常的双核络合物[Ni 2(L–2H)](PF 627)和[Pd 2(L–2H)] [PF 628)(L–2H =分别从L的两个仲胺基团中除去两个H +离子后的去质子化的配体,其特征在于由两个桥联酰胺形成的罕见的M 2 N 2核。7也由5的反应形成在NaOAc存在下用1.0当量的Ni(OAc)2 ·4H 2 O取代。的转移金属化2用Ni(PPH的2.0当量322给出[镍2(L)(μ-O)](PF 629),双核的第一个例子的Ni(II)配合物与单独架桥氧代基团。9被转换为7通过用NaOAc治疗以良好的收率。
更新日期:2017-09-21
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