State Key Laboratory for Oxo Synthesis & Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China.
Dalton Trans. 2009 Aug 7(29):5773-9. doi: 10.1039/b904478g. Epub 2009 Jun 12.
A series of mononuclear and dinuclear zinc compounds, Na(Et(2)O)[((H)L(iPr))Zn-Zn((H)L(iPr))] x Et(2)O (1), Zn(2)((H)L(iPr))(3)K(2)(Et(2)O)(2) (2, (H)L(iPr) = (2,6-(i)Pr(2)C(6)H(3))NCH), [Zn((H)L(Mes))(2)] (4, (H)L(Mes) = (2,4,6-Me(3)C(6)H(2))NCH), and [ZnL(Mes)(2)Na(2)(THF)(2)] (5, L(Mes) = (2,4,6-Me(3)C(6)H(2))NC(Me)), and a potassium complex, ((H)L(iPr))(2)K(4)(THF)(2) (3), have been synthesized by alkali metal reduction of the corresponding LZnCl(2) precursors. The Zn-Zn bond in 1 (2.3673(6) A) is slightly shorter than that in the analogous compounds M(THF)(2)[L(iPr)Zn-ZnL(iPr)] (L(iPr) = (2,6-(i)Pr(2)C(6)H(3))NC(Me), M = Na, 2.399(1) A; M = K, 2.393(1) A). Complexes 2 and 3 feature a two- and one-dimensional (linear chain) polymeric structure, respectively, linked by K-C bonds between the potassium ion and aryl carbon atoms. Notably, complex 2 contains a ligand whose central C(2)N(2) core is in the trans conformation, acting as a non-chelating bridge between the two zinc atoms. While the ligands in 1, 2, 3 and 5 are doubly reduced to the dianion, complex 4 contains a pair of monoanionic ligands.
一系列单核和双核锌配合物，Na(Et(2)O)[((H)L(iPr))Zn-Zn((H)L(iPr))] x Et(2)O（1），Zn(2)((H)L(iPr))(3)K(2)(Et(2)O)(2)（2，（H）L(iPr) = (2,6-(i)Pr(2)C(6)H(3))NCH），[Zn((H)L(Mes))(2)]（4，（H）L(Mes) = (2,4,6-Me(3)C(6)H(2))NCH），和[ZnL(Mes)(2)Na(2)(THF)(2)]（5，L(Mes) = (2,4,6-Me(3)C(6)H(2))NC(Me)），以及一个钾配合物，((H)L(iPr))(2)K(4)(THF)(2)（3），通过碱金属还原相应的 LZnCl(2)前体合成。在 1（2.3673(6) A）中，Zn-Zn 键比在类似的化合物M(THF)(2)[L(iPr)Zn-ZnL(iPr)]（L(iPr) = (2,6-(i)Pr(2)C(6)H(3))NC(Me)，M = Na，2.399(1) A；M = K，2.393(1) A）中略短。配合物 2 和 3 分别呈现二维（线性链）聚合物结构，由钾离子和芳基碳原子之间的 K-C 键连接。值得注意的是，配合物 2 含有一个配体，其中心 C(2)N(2)核心处于反式构象，充当两个锌原子之间的非螯合桥。虽然 1、2、3 和 5 中的配体都被还原为二价阴离子，但配合物 4 含有一对单价阴离子配体。
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