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首页> 外文期刊>Acta crystallographica. Section C, Structural chemistry. >Diminished electron density in the Vaska-type rhodium(I) complex trans-[Rh(NCBH_3)(CO)(PPh_3)_2]
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Diminished electron density in the Vaska-type rhodium(I) complex trans-[Rh(NCBH_3)(CO)(PPh_3)_2]

机译:Vaska型铑(I)复合体[RH(NCBH_3)(CO)(PPH_3)_2]中的电子密度减少

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摘要

Vaska-type complexes, i.e. trans-[RhX(CO)(PPh_3)_2] (X is a halogen or pseudo-halogen), undergo a range of reactions and exhibit considerable catalytic activity. The electron density on the Rh~I atom in these complexes plays an important role in their reactivity. Many cyanotrihydridoborate (BH_3CN~-) complexes of Group 6-8 transition metals have been synthesized and structurally characterized, an exception being the rhodium(I) complex. Carbonyl(cyano-trihydridoborato-κN)bis(triphenylphosphine-κP)rhodium(I), [Rh(NCBH_3)(CO)-(C_18H_15P)_2], was prepared by the metathesis reaction of sodium cyanotrihydridoborate with trans-[RhCl(CO)(PPh_3)_2], and was characterized by single-crystal X-ray diffraction analysis and IR, ~1H, ~13C and B NMR spectroscopy. The X-ray diffraction data indicate that the cyanotrihydridoborate ligand coordinates to the Rh~I atom through the N atom in a trans position with respect to the carbonyl ligand; this was also confirmed by the IR and NMR data. The carbonyl stretching frequency ν(CO) and the carbonyl carbon ~1J_c-Rh and ~1J_C-P coupling constants of the C_ipso atoms of the triphenylphosphine groups reflect the diminished electron density on the central RhI atom compared to the parent trans-[RhCl(CO)(PPh_3)_2] complex.
机译:Vaska-型复合物,即转蛋白[rhx(CO)(PPH_3)_2](x是卤素或假卤素),经历一系列反应并表现出相当大的催化活性。在这些配合物中RH〜I原子上的电子密度在反应性中起重要作用。在6-8组过渡金属组的许多Cyanotrihydroborate(BH_3CN〜 - )复合物已经合成和结构表征,是铑(I)复合物的例外。羰基(Cyano-trihydrodoborato-κN)双(三苯基膦-κP)铑(I),[rh(NcbH_3)(CO) - (C_18H_15P)_2]通过钠硫化钠用反式 - [RHCL(CO )(PPH_3)_2],其特征在于单晶X射线衍射分析和IR,〜1H,〜13C和B NMR光谱。 X射线衍射数据表明,氰基二氢硼酸盐配体通过相对于羰基配体的反式位置中的N原子坐落于RH〜I原子; IR和NMR数据也证实了这一点。三苯基膦基团的C_IPSO原子的C_IPSO原子的羰基拉伸频率△(CO)和羰基碳〜1J_C-RH和〜1J_C-P耦合常数反映了与母体反式 - β( CO)(PPH_3)_2]复杂。

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