Neutral and Cationic Zirconium Hydrides Supported by a Dianionic (NNNN)-Type Macrocycle Ligand

Neutral and Cationic Zirconium Hydrides Supported by a Dianionic (NNNN)-Type Macrocycle Ligand
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双阴离子 (NNNN) 型大环配体负载的中性和阳离子氢化锆

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发表时间:
2015
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通讯作者:
J. Okuda
J. Okuda
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文献类型:
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作者:
H. Kulinna;T. Spaniol;J. Okuda

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由[Zr(CH_2SiMe_3)_4]与1,7-二甲基-1,4,7,10-四氮杂环十二烷(Me_2TACD)H_2反应制得的双(三甲基硅甲基)锆配合物[Zr(Me_2TACD)(CH_2SiMe_3)_2](1),经氢化得到双核烃基氢化物[Zr(Me_2TACD)(CH_2SiMe_3)_2(μ-H)_2Zr(Me_2TACD)](2)。根据NMR光谱和单晶X-射线衍射研究,2表现出一个Cs对称的结构,有两个不同的锆中心,一个8-和其他7-协调,桥接的酰胺供体和两个双。三甲基硅基甲基被弱Bronsted酸[NEt_3 H][B(3,5-C6 H3Cl 2)4]夺取,得到单阳离子二氢化物[Zr(Me 2 TACD)(CH 2SiMe 3)(μ-H)2 Zr(Me 2 TACD)][B(3,5-C6 H3Cl 2)4](3)和双阳离子氢化物[Zr(Me 2 TACD)(THF)2(μ-H)2 Zr(Me 2 TACD)][B(3,5-C6 H3Cl 2)4]2(4).阳离子配合物3和4的X-射线晶体学揭示了一个Cs-对称的双核结构来自2。
Hydrogenation of bis(trimethylsilylmethyl) zirconium complex [Zr(Me2TACD)(CH2SiMe3)2] (1), prepared by reacting [Zr(CH2SiMe3)4] with 1,7-dimethyl-1,4,7,10-tetraazacyclododecane (Me2TACD)H2, gave dinuclear alkyl hydride complex [Zr(Me2TACD)(CH2SiMe3)2(μ-H)2Zr(Me2TACD)] (2). According to NMR spectroscopic and single-crystal X-ray diffraction studies, 2 exhibits a Cs-symmetrical structure with two distinct zirconium centers, one eight- and the other seven-coordinate, bridged by an amido donor and two hydrides. Abstraction of the trimethylsilylmethyl groups by the weak Bronsted acid [NEt3H][B(3,5-C6H3Cl2)4] gave the monocationic mono(alkyl) dihydride [Zr(Me2TACD)(CH2SiMe3)(μ-H)2Zr(Me2TACD)][B(3,5-C6H3Cl2)4] (3) and the dicationic hydride complex [Zr(Me2TACD)(THF)2(μ-H)2Zr(Me2TACD)][B(3,5-C6H3Cl2)4]2 (4). X-ray crystallography of the cationic complexes 3 and 4 revealed a Cs-symmetrical dinuclear structure derived from that of 2.