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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Synthesis and oxidation of d~6 tungsten pincer complexes: a complete series of tungsten(II) hydridocarbonyl and halocarbonyl pincer complexes
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Synthesis and oxidation of d~6 tungsten pincer complexes: a complete series of tungsten(II) hydridocarbonyl and halocarbonyl pincer complexes

机译:d〜6钨夹钳配合物的合成和氧化:氢化羰基钨和卤代羰基夹钳配合物的完整系列

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Reaction of the neutral P~HNP ligand [HN(SiMe_2CH_2PPh_2)_2] with tungsten hexacarbonyl resulted in coordination of P~HNP through both phosphorus donor atoms to form the tungsten complex [W(P~(HN)P)-(CO)_4] (1). Reaction of P~HNP with tris(acetonitrile)tricarbonyl tungsten gave both facial and meridional tridentate isomers [W(P~HNP)(CO)_3] (2-fac and 3-mer). These three d~6 tungsten complexes could be interconverted under appropriate conditions. The thermodynamically favored isomer 3 was protonated to form seven-coordinate [W(P~HNP)(CO)_3H][BF_4] (4). A related series of cationic rungsten(n) halide complexes was synthesized, [W(P~HNP)(CO)_3X]~+(6, X = I; 7, X = Br; 8, X = C1; 9, X = F), by various routes. All of the tungsten(II) complexes underwent deprotonation at the amine site of the P~HNP ligand when triethylamine was added, resulting in neutral seven-coordinate complexes. Variable temperature ~1H, ~(31)P{~1H}, and ~13C{~1H} NMR spectroscopy showed fluxional behavior for all the seven-coordinate complexes reported here. Analysis of IR and NMR spectroscopic data showed trends through the series of coordinated halides. Crystal structures of tetracarbonyl 1, meridional tricarbonyl 3, and cationic hydride 4 were determined to confirm the coordination mode of the P~HNP ligand.
机译:中性P〜HNP配体[HN(SiMe_2CH_2PPh_2)_2]与六羰基钨的反应导致P〜HNP通过两个磷供体原子配位形成钨配合物[W(P〜(HN)P)-(CO)_4 ](1)。 P〜HNP与三(乙腈)三羰基钨反应生成面和子午三齿异构体[W(P〜HNP)(CO)_3](2-fac和3-mer)。这三种d〜6钨配合物可以在适当的条件下相互转化。使热力学上有利的异构体3质子化以形成七坐标的[W(P〜HNP)(CO)_3H] [BF_4](4)。合成了一系列相关的阳离子梯格滕(n)卤化物配合物,[W(P〜HNP)(CO)_3X]〜+(6,X = I; 7,X = Br; 8,X = C1; 9,X = F),通过各种路线。当添加三乙胺时,所有的钨(II)配合物在P〜HNP配体的胺位点都经历了去质子化反应,生成了中性的七配位配合物。可变温度〜1H,〜(31)P {〜1H}和〜13C {〜1H} NMR光谱显示,此处报道的所有七坐标络合物的通量行为。红外光谱和核磁共振光谱数据的分析显示了一系列配位卤化物的趋势。确定了四羰基1,子午三羰基3和阳离子氢化物4的晶体结构,以确认P〜HNP配体的配位模式。

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