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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Synthesis and reactivity of fluorinated ferracarborane anions
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Synthesis and reactivity of fluorinated ferracarborane anions

机译:氟化亚铁硼烷阴离子的合成与反应性

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摘要

The ferracarborane [N(PPh3)(2)][6,6,6,10,10,10-(CO)(6)-closo-6,10,1-Fe2CB7H8] (2) reacts in CH2Cl2 with 3 molar equivalents of Ag[PF6] to yield the trifluoro-substituted species [N(PPh3)(2)][7,8,9-F-3-6,6,6,10, 10,10-(CO)(6)-closo-6,10,1-Fe2CB7H5] (3). Compound 3 undergoes structural rearrangement in toluene at reflux temperatures, forming [N(PPh3)(2)][8,9,10-F-3-6,6,6,7,7,7-(CO)(6)-closo-6,7,1-Fe2CB7H5] (4). Alternatively, reaction of either 2 or 3 with a 10- fold excess of Ag[PF6] in CH2Cl2 forms two species: namely, [N(PPh3)(2)][2,7,9,10-F-4-6,6,6,8,8,8-(CO)(6)-closo-6,8,1-Fe2CB7H4] (5), in which one further B-F substitution has occurred and the {Fe2CB7} cluster core has rearranged, plus a mono-iron co-product, [N(PPh3)(2)][3,8,9-F-3-7,7,7-(CO)(3)-closo-7,1-FeCB7H5] (6) that is formed by polyhedral contraction. Treatment of 3 with [NO][BF4] in CH2Cl2 results in CO substitution at the 4-connected iron vertex [Fe(10)], producing the zwitterionic complex [7,8,9-F-3-6,6,6,10,10-(CO)(5)-10-NO-closo-6,10,1-Fe2CB7H5] (7). Addition of Me3NO to a mixture of 3 and PEt3 in CH2Cl2 also results in CO substitution, forming the isomeric species [N(PPh3)(2)][7,8,9-F-3-6,6,m,10,10-(CO)(5)-n-PEt3-closo-6,10,1-Fe2CB7H5] [m = 6, n = 10 (8a); m = 10, n = 6 (8b)] in a 5 : 1 ratio. Treatment of 8a with [NO][BF4] and then CNBut in CH2Cl2 allows further, successive CO substitution at Fe(10) to yield first a neutral, zwitterionic complex [7,8,9-F-3-6,6,6,10-(CO)(4)-10-NO-10-PEt3-closo-6,10,1-Fe2CB7H5] (9) and then [7,8,9-F-3-6,6,6-(CO)(3)-10-CNBut-10-NO-10-PEt3-closo-6,10,1-Fe2CB7H5] (10). The molecular structures of compounds 3, 4, 5, 6, and 10 have been established by X-ray diffraction.
机译:亚铁硼烷[N(PPh3)(2)] [6,6,6,10,10,10-(CO)(6)-closo-6,10,1-Fe2CB7H8](2)在CH2Cl2中与3摩尔反应当量的Ag [PF6]产生三氟取代的物种[N(PPh3)(2)] [7,8,9-F-3-6,6,6,10,10,10-(CO)(6 )-closo-6,10,1-Fe2CB7H5](3)。化合物3在回流温度下在甲苯中进行结构重排,形成[N(PPh3)(2)] [8,9,10-F-3-6,6,6,7,7,7-(CO)(6) -closo-6,7,1-Fe2CB7H5](4)。或者,2或3与10倍过量的CH2Cl2中的Ag [PF6]反应形成两种:即[N(PPh3)(2)] [2,7,9,10-F-4-6 ,6,6,8,8,8-(CO)(6)-closo-6,8,1-Fe2CB7H4](5),其中又发生了一次BF取代,{Fe2CB7}簇芯已重新排列,加上单铁副产物[N(PPh3)(2)] [3,8,9-F-3-7,7,7-(CO)(3)-closo-7,1-FeCB7H5] (6)是由多面体收缩形成的。在CH2Cl2中用[NO] [BF4]处理3会导致在4连接的铁顶点[Fe(10)]处发生CO取代,从而产生两性离子络合物[7,8,9-F-3-6,6,6 ,10,10-(CO)(5)-10-NO-closo-6,10,1-Fe2CB7H5](7)。在CH2Cl2中将Me3NO加至3和PEt3的混合物中也会导致CO取代,形成同分异构体[N(PPh3)(2)] [7,8,9-F-3-6,6,m,10, 10-(CO)(5)-n-PEt3-closo-6,10,1-Fe2CB7H5] [m = 6,n = 10(8a); m = 10,n = 6(8b)],比率为5:1。用[NO] [BF4]然后用CNBut在CH2Cl2中处理8a,可以进一步在Fe(10)处连续进行CO取代,从而首先生成中性的两性离子复合物[7,8,9-F-3-6,6,6 ,10-(CO)(4)-10-NO-10-PEt3-closo-6,10,1-Fe2CB7H5](9),然后是[7,8,9-F-3-6,6,6- (CO)(3)-10-CNBut-10-NO-10-PEt3-closo-6,10,1-Fe2CB7H5](10)。化合物3、4、5、6和10的分子结构已经通过X射线衍射确定。

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