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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Synthesis and reactivity of copper(I) complexes containing a bis(imidazolin-2-imine) pincer ligand
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Synthesis and reactivity of copper(I) complexes containing a bis(imidazolin-2-imine) pincer ligand

机译:含双(咪唑啉-2-亚胺)钳型配体的铜(I)配合物的合成和反应性

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摘要

The new pincer ligand 2,6- bis[( 1,3- di- tert- butylimidazolin- 2- imino) methyl] pyridine ( TLtBu) has been prepared in high yield from 2,6- bis( hydroxymethyl) pyridine ( 1) and 1,3- di- tert- butylimidazolin- 2- imine ( 3). Reaction of TLtBu with [ Cu( MeCN)(4)] PF6 affords the highly reactive copper( I) complex [( TLtBu) Cu] PF6, [ 5] PF6, which forms the stable copper( I) isocyanide complexes [ 6a] PF6 ( v(CN) = 2179 cm(-1)) and [ 6b] PF6 ( v(CN) = 2140 cm(-1)) upon addition of tert- butyl or 2,6- dimethylphenyl isocyanide, respectively. For the cations 6a and 6b, DFT calculations reveal ground- state electronic structures of the type [( TLtBu- kappa N-1: kappa N-2) Cu( CNR)] with tricoordinate geometries around the copper atoms. Exposure of [ 5] PF6 to the air readily leads to trapping of atmospheric CO2 to form the square- planar complex [( TLtBu) Cu( HCO3- kappa O)] PF6, [ 7] PF6, with the bicarbonate ligand adopting a rarely observed monodentate coordination mode. In chlorinated solvents such as dichloromethane or chloroform, [ 5] PF6 rapidly abstracts chloride by reductive dechlorination of the solvent to yield [( TLtBu) CuCl] PF6, [ 8] PF6 quantitatively. Reaction of TLtBu with copper( I) bromide or chloride affords complexes 9a and 9b, respectively, for which X- ray diffraction analysis, low-temperature NMR experiments and DFT calculations reveal the presence of a kappa(2)- coordinated ligand of the type [( TLtBu - kappa N-1: kappa N-2) CuX]. In solution, complex 9b undergoes slow disproportionation forming the mixed- valence copper( II)/ copper( I) system [( TLtBu) CuCl][ CuCl2], [ 8] CuCl2 with a linear dichlorocuprate( I) counterion.
机译:由2,6-双(羟甲基)吡啶(1)以高收率制备了新的钳形配体2,6-双[(1,3-二叔丁基咪唑啉-2-亚氨基)甲基]吡啶(TLtBu)。和1,3-二叔丁基咪唑啉-2-亚胺(3)。 TLtBu与[Cu(MeCN)(4)] PF6反应可得到高反应性铜(I)络合物[(TLtBu)Cu] PF6,[5] PF6,形成稳定的异氰酸铜(I)络合物[6a] PF6 (v(CN)= 2179 cm(-1))和[6b] PF6(v(CN)= 2140 cm(-1)),分别加入叔丁基或2,6-二甲基苯基异氰化物。对于阳离子6a和6b,DFT计算揭示了[(TLtBu-κN-1:kappa N-2)Cu(CNR)]型的基态电子结构,其铜原子周围具有三坐标几何形状。 [5] PF 6暴露在空气中容易导致大气中的二氧化碳截留,从而形成方形复合物[(TLtBu)Cu(HCO3- kappa O)] PF 6,[7] PF 6,而碳酸氢盐配体很少采用单齿协调模式。在氯化溶剂(例如二氯甲烷或氯仿)中,[5] PF6通过溶剂的还原性脱氯反应迅速提取氯化物,从而定量生成[(TLtBu)CuCl] PF6,[8] PF6。 TLtBu与溴化铜(I)或氯化物的反应分别得到配合物9a和9b,对其进行X射线衍射分析,低温NMR实验和DFT计算表明存在这种类型的kappa(2)配位的配体[(TLtBu-kappa N-1:kappa N-2)CuX]。在溶液中,络合物9b经历缓慢歧化,形成了具有线性二氯铜酸盐(I)抗衡离子的混合价铜(II)/铜(I)系统[(TLtBu)CuCl] [CuCl2],[8] CuCl2。

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