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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Iron(II) complexes of ditopic carbanionic carbenes?
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Iron(II) complexes of ditopic carbanionic carbenes?

机译:异位碳酰碳烯的铁(II)配合物?

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Reaction of dimesityliron(II) (Fe_2(mes)_4) with the N-heterocyclic carbenes 1,3-bis(2,6-diisopropylphenyl)- imidazol-2-ylidene (IPr) and 1,3-bis(2,6-dimethylphenyl)hexahydropyrimidin-2-ylidene (6-Xyl) afforded the novel trigonal planar complexes [Fe(IPr)(mes)_2] (1) and [Fe(6-Xyl)(mes)2] (2), respectively. Both species were structurally characterized by single crystal X-ray diffraction and display structures and magnetic responses consistent with a quintet ground state (S = 2). Reaction of 1 with KC_8 in THF afforded K~+ salts of the anionic complex [{:C[N(2,6-~iPr_2C_6H_3)]_2(CH)C}_2Fe(mes)]~? (3) and the homoleptic organometallic anion [Fe(mes)_3]~? (4). By contrast, reduction of 2 resulted in extensive decomposition and intractable product mixtures. Complex 3 is coordinated by two ditopic carbanionic carbenes via the C4/C5 position while the C2 position retains unquenched carbenic character and remains vacant for further coordination. This was corroborated by reacting solutions of 3 with one and two equivalents of triethylaluminium (AlEt3) which resulted in the formation of [{Et_3Al:C[N(2,6-~iPr_2C_6H_3)]_2(CH)C}{:C[N(2,6-~iPr_2C_6H_3)]_2- (CH)C}Fe(mes)]? (5) and [{Et_3Al:C[N(2,6-~iPr_2C_6H_3)]_2(CH)C}_2Fe(mes)]? (6), respectively. Both of these species were structurally characterized as [K(2,2,2-crypt)]~+ salts.
机译:Dimesityliron(II)(Fe_2(mes)_4)与N-杂环卡宾1,3-双(2,6-二异丙基苯基)-咪唑-2-亚烷基(IPr)和1,3-双(2,6)的反应-二甲基苯基)六氢嘧啶-2-亚甲基(6-Xyl)分别提供了新颖的三角平面络合物[Fe(IPr)(mes)_2](1)和[Fe(6-Xyl)(mes)2](2) 。两种物质的结构特征均通过单晶X射线衍射和显示结构以及与五重态基态(S = 2)一致的磁响应来实现。 1与KC_8在THF中反应,得到阴离子配合物[{:C [N(2,6-〜iPr_2C_6H_3)] _ 2(CH)C} _2Fe(mes)]〜的K +盐。 (3)和均质有机金属阴离子[Fe(mes)_3]〜? (4)。相比之下,减少2会导致大量分解和难处理的产品混合物。配合物3通过C4 / C5位置由两个对位的碳氧碳烯化合物进行配位,而C2位置保留了非猝灭的羧基特征,并保持空缺以进行进一步的配位。通过使3的溶液与一当量和两当量的三乙基铝(AlEt3)反应来证实这一点,这导致[{Et_3Al:C [N(2,6-〜iPr_2C_6H_3)] _ 2(CH)C} {:C [ N(2,6-〜iPr_2C_6H_3)] _ 2-((CH)C} Fe(mes)]? (5)和[{Et_3Al:C [N(2,6-〜iPr_2C_6H_3)] _ 2(CH)C} _2Fe(mes)]? (6)分别。这两种物质在结构上均被表征为[K(2,2,2-crypt)]〜+盐。

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