Reactions of a Niobium Nitride Complex Prepared from Dinitrogen: Synthesis of Imide and Ureate Complexes and Ammonia Formation

Reactions of a Niobium Nitride Complex Prepared from Dinitrogen: Synthesis of Imide and Ureate Complexes and Ammonia Formation
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DOI:
10.1002/ejic.201300172
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发表时间:
2013-08-06
影响因子:
2.3
通讯作者:
Kawaguchi, Hiroyuki
Kawaguchi, Hiroyuki
中科院分区:
化学3区
文献类型:
--
作者:
Akagi, Fumio;Suzuki, Shoui;Kawaguchi, Hiroyuki

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由[K(DME)](2)[{(O-3)Nb}(2)(-H)(4)](1)和N-2制备的氮化物络合物[K(thf)(2)](2)[{(O-3)Nb}(2)(-N)(2)](2)用2,6-氯化镥质子化以产生氨和[(O-3)NbCl 3](-)(3),其中H-3[O-3] =三(3,5-二叔丁基-2-羟基苯基)甲烷。3与KBHEt 3的反应再生了[K(DME)](2)[{(O-3)Nb}(2)(-H)(4)](1),从而完成了将N-2转化为NH3的合成循环。2与甲基碘的烷基化导致形成[K(thf)][{(O-3)Nb}(2)(-N)(-NMe)](4)和[{(O-3)Nb}(2)(-NMe)(2)](5)。5与吡啶反应得到末端酰亚胺配合物[(O-3)Nb=NMe(py)(2)](6)。酰亚胺单体6与CO2反应生成2:1的[(O-3)Nb{(MeN)(2)CO}(py)](7)和[{(O-3)Nb}(2)(-O)(2)](8),而6与p-TolNCO反应生成不对称脲配合物[(O-3)Nb{p-TolNC(O)NMe}(py)](9)。
A nitride complex [K(thf)(2)](2)[{(O-3)Nb}(2)(-N)(2)] (2), prepared from [K(DME)](2)[{(O-3)Nb}(2)(-H)(4)] (1) and N-2, was protonated with 2,6-lutidinium chloride to yield ammonia and [(O-3)NbCl3](-) (3), where H-3[O-3] = tris(3,5-di-tert-butyl-2-hydroxy phenyl)methane. The reaction of 3 with KBHEt3 regenerated [K(DME)](2)[{(O-3)Nb}(2)(-H)(4)] (1), thereby completing a synthetic cycle for the conversion of N-2 to NH3. Alkylation of 2 with methyl iodide led to formation of [K(thf)][{(O-3)Nb}(2)(-N)(-NMe)] (4) and [{(O-3)Nb}(2)(-NMe)(2)] (5). Treatment of 5 with pyridine afforded a terminal imide complex [(O-3)Nb=NMe(py)(2)] (6). The imide monomer 6 reacted with CO2 to give [(O-3)Nb{(MeN)(2)CO}(py)] (7) and [{(O-3)Nb}(2)(-O)(2)] (8) in a 2:1 ratio, while the reaction of 6 with p-TolNCO gave an asymmetric ureate complex [(O-3)Nb{p-TolNC(O)NMe}(py)] (9).