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首页> 外文期刊>Organometallics >Synthesis and structural studies of cationic bis- and tris(pyrazol-1-yl)methane acyl and methyl complexes of ruthenium(II): Localization of the counterion in solution by NOESY NMR spectroscopy
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Synthesis and structural studies of cationic bis- and tris(pyrazol-1-yl)methane acyl and methyl complexes of ruthenium(II): Localization of the counterion in solution by NOESY NMR spectroscopy

机译:钌(II)的阳离子双和三(吡唑-1-基)甲烷酰基和甲基络合物的合成和结构研究:NOESY NMR光谱法确定反离子在溶液中的定位

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摘要

Complex fac-Ru(PMe3)(CO)(3)(Me)I (1) reacts with tris- and bis(pyrazol-1-yl)methane, in the presence of NdBPh4, affording cis-[Ru(PMe3)(CO)(2)(COMe)(eta(2)-pz(3)-CH)]BPh4 (2) and cis-[Ru(PMe3)(CO)(2)(COMe)(pz(2)-CH2)]BPh4 (4), respectively. Complexes 2 and 4 decarbonylate leading to [Ru(PMe3)(CO)(COMe)(eta(3)-pz(3)-CH)]BPh4 (3) and a mixture of three methyl stereoisomers of cis-[Ru(PMe3)(CO)(2)(Me)(pz(2)-CH2)]BPh4 (5-7), respectively. The byproduct of the synthesis of 1, fac,cis-Ru(PMe3)(CO)(3)(I)(2) (8), reacts with bis(pyrazol-1-yl)methane affording cis-[Ru(PMe3)(CO)(2)(I)(pz(2)-CH2)]BPh4 (9). The stereochemistry of the complexes, the dynamic processes existing between them, and the interionic structures of all of the cationic complexes were investigated by the phase-sensitive H-1 NOESY NMR spectra in CD2Cl2. The solid-state crystal structure of 4, obtained by single-crystal X-ray studies, was compared from the intramolecular and interionic point of views with that in solution with the help of 3-21G* ab initio and AMI-SM2 semiempirical quantum mechanical and docking mechanic calculations. In particular, the differences of interaction energy of-the six solid-state ion pairs determined by the cation and the six symmetry-related anions surrounding it were estimated. The main result is that the averaged preferred position of the counterion in solution corresponds to the ion-pair electrostatically (Delta E-el > 2.5 kcal/mol) and "sterically" (Delta E-st > 3.7 kcal/mol) favored in the solid state. [References: 32]
机译:复杂的fac-Ru(PMe3)(CO)(3)(Me)I(1)在NdBPh4存在下与三和双(吡唑-1-基)甲烷反应,得到顺式[Ru(PMe3)( CO)(2)(COMe)(eta(2)-pz(3)-CH)] BPh4(2)和顺式-[Ru(PMe3)(CO)(2)(COMe)(pz(2)-CH2 )] BPh4(4)。配合物2和4脱羰形成[Ru(PMe3)(CO)(COMe)(eta(3)-pz(3)-CH)] BPh4(3)和顺式[Ru(PMe3)的三种甲基立体异构体的混合物)(CO)(2)(Me)(pz(2)-CH2)] BPh4(5-7)。 1,fac,cis-Ru(PMe3)(CO)(3)(I)(2)(8)的合成副产物与双(pyrazol-1-yl)甲烷反应得到cis- [Ru(PMe3) )(CO)(2)(I)(pz(2)-CH2)] BPh4(9)。通过CD2Cl2中的相敏H-1 NOESY NMR光谱研究了配合物的立体化学,它们之间存在的动力学过程以及所有阳离子配合物的离子间结构。通过分子内和离子间的观点,比较了通过单晶X射线研究获得的4的固态晶体结构,并借助3-21G *从头算和AMI-SM2半经验量子力学比较了溶液中的固态晶体结构。和对接机械计算。特别地,估计了由阳离子和围绕它的六个对称相关阴离子确定的六个固态离子对的相互作用能的差。主要结果是抗衡离子在溶液中的平均优先位置对应于静电对中离子对(Delta E-el> 2.5 kcal / mol)和“空间”离子对(Delta E-st> 3.7 kcal / mol)。固体状态。 [参考:32]

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