Linkage isomerism in transition-metal complexes of mixed (arylcarboxamido)(arylimino)pyridine ligands.

Linkage isomerism in transition-metal complexes of mixed (arylcarboxamido)(arylimino)pyridine ligands.
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DOI:
10.1021/ic500638z
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发表时间:
2014-06-02
影响因子:
4.6
通讯作者:
Tolman WB
Tolman WB
中科院分区:
化学2区
文献类型:
--
作者:
Boyce DW;Salmon DJ;Tolman WB

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合成了一系列不对称混合2,6-二取代(芳基甲酰氨基)(芳基亚氨基)吡啶配体,并研究了它们与一系列二价第一排过渡金属(Cu,Co,Zn)的配位化学.合成了具有N,N′,N″-羧酰胺阴离子和O,N,N′-羧酰胺中性配位的配合物,并通过X射线衍射、循环伏安、紫外-可见光谱和EPR光谱进行了表征。具体而言,RLM(X)(M = Cu; X = Cl-,OAc-)和RL(H)MX2(M = Cu,Co,Zn; X = Cl-,SbF 6-)配合物具有N,N′,N″-或O,N,N′-配位。多种形式的光谱也证实了碱诱导的键异构化从O,N,N′-甲酰胺到N,N′,N″-甲酰胺配位。采用模块化方法合成了2,6-二取代(芳基甲酰胺基)(芳基亚氨基)吡啶类配体,并研究了它们与二价Cu、Co、Zn离子的配位化学,揭示了N,N′,N″-和O,N,N′-两种配位方式.
The synthesis of a series of asymmetric mixed 2,6-disubstituted (arylcarboxamido)(arylimino)pyridine ligands and their coordination chemistry toward a series of divalent first-row transition metals (Cu, Co, and Zn) have been explored. Complexes featuring both anionic N,N′,N″-carboxamido and neutral O,N,N′-carboxamide coordination have been prepared and characterized by X-ray crystallography, cyclic voltammetry, and UV–visible and EPR spectroscopy. Specifically, RLM(X) (M = Cu; X = Cl–, OAc–) and RL(H)MX2 (M = Cu, Co, Zn; X = Cl–, SbF6–) complexes that feature N,N′,N″- or O,N,N′-coordination are presented. Base-induced linkage isomerization from O,N,N′-carboxamide to N,N′,N″-carboxamido coordination is also confirmed by multiple forms of spectroscopy. A modular synthesis of hybrid 2,6-disubstituted (arylcarboxamido)(arylimino)pyridine ligands has been developed, and their coordination chemistry with divalent Cu, Co, and Zn ions has been explored, revealing both N,N′,N″- and O,N,N′-binding.
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