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
中科院分区:
文献类型:
--
作者:
Kennedy A
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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