Structural Elucidation of tmeda-Solvated Alkali Metal Diphenylamide Complexes

Structural Elucidation of tmeda-Solvated Alkali Metal Diphenylamide Complexes
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tmeda 溶剂化碱金属二苯酰胺配合物的结构解析

DOI:
10.1002/ejic.200900782
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发表时间:
2009
影响因子:
2.3
通讯作者:
Kennedy A
Kennedy A
中科院分区:
化学3区
文献类型:
--
作者:
Kennedy A

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二苯胺的锂盐、钠盐和钾盐已通过使用去质子化途径制备,并在固态(通过X射线晶体学)和溶液(通过NMR光谱研究)中表征。在每种情况下,金属原子的配位层通过与合成上重要的共配体N,N,N′,N′-四甲基乙二胺(tmeda)配位而完成。配合物1和2 [{(tmeda)M(NPh 2)}2](对于1,M = Li,对于2,M = Na)可以通过将1摩尔当量的NPh 2和1摩尔当量的NPh 2处理来制备。的母体胺与等摩尔量的nBuM和tmeda在己烷溶液中。在固态下,1和2基本上是同构的,是具有四原子M-N-M-N骨架的二聚体。每个M原子的配位层由一个双齿三齿分子完成。配合物3 [{(tmeda)_3/2K(NPh_2)}_2]的制备方法与文献[1]和[2]相似,只是用苄基钾作金属化剂。此外,4 mol当量的需要10 μ L TMEDA以完全溶解重碱金属氨基化物混合物。在固态下,3以双核K-N-K-N环的聚合物阵列形式存在。类似于1和2,K原子与双齿tmeda分子配位;然而,每个K原子也与另一个tmeda分子结合,作为单齿桥,从而产生配位聚合物。晶体1和2可溶于C6 D 6;因此,可以进行NMR光谱研究。这些表明固态结构在芳烃溶液中似乎保持完整。另一方面,3不溶于C6 D 6;因此在[D8]thf中进行了溶液研究。这些研究表明,3在真空分离过程中容易释放tmeda。(© Wiley‐VCH Verlag GmbH & Co. KGaA,69451魏因海姆,德国,2009)
Lithium, sodium and potassium salts of diphenylamine have been prepared by using a deprotonative route and characterised in both, solid state (by X‐ray crystallography) and solution (by NMR spectroscopic studies). In each case the metal atom's coordination sphere is completed by coordination to the synthetically important co‐ligandN,N,N′,N′‐tetramethylethylenediamine (tmeda). Complexes1and2[{(tmeda)M(NPh2)}2] (M = Li for1, Na for2) can be prepared by treating 1 mol.‐equiv. of the parent amine with an equimolar quantity ofnBuM and tmeda in hexane solution. In the solid state,1and2are essentially isostructural, being dimeric with a four‐atom M–N–M–N framework. The coordination sphere of each M atom is completed by a bidentate tmeda molecule. Complex3[{(tmeda)3/2K(NPh2)}2] has been prepared in a similar way to1and2except that benzylpotassium has been utilised as the metallating agent. In addition, 4 mol‐equiv. of tmeda is required to fully solubilise the heavy alkali metal amide mixture. In the solid state,3exists as a polymeric array of dinuclear K–N–K–N rings. Akin to1and2, the K atom is coordinated to a bidentate tmeda molecule; however, each K atom is also bound to another tmeda molecule that acts as a monodentate bridge, thus producing the coordination polymer. Crystalline1and2are soluble in C6D6; hence, NMR spectroscopic studies could be performed. These show that the solid‐state structure appears to stay intact in arene solution. On the other hand,3is not soluble in C6D6; so solution studies have been performed in [D8]thf. These studies reveal that3readily looses tmeda during in‐vacuo isolation. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
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