Bifunctional Imidazolylphosphine Ligands as Hydrogen Bond Donors Promote N−H and O−H Activation on Platinum
摘要:
The NH moieties of two imidazolylphosphine ligands on Pt(II) facilitate formation of trans-(hydrido)((RO)-O-1) bis-(phosphine) Pt(II) species from (ROH)-O-1 (R-1 = CF3CO, CH3CO, Ph, CH3, H). Evidence points to formation of a reliable binding pocket for coordinated (RO)-O-1 by hydrogen bond donation from the two NH groups.
Non-symmetric diphosphines based on the imidazole scaffold: an unusual group interchange involving Pd–CH<sub>3</sub> and (imidazole)P–Ph cleavage
作者:Pengfei Ai、Andreas A. Danopoulos、Pierre Braunstein
DOI:10.1039/c3dt53025f
日期:——
The regioisomeric diphosphines L1 and L2 show dramatic differences in reactivity and when coordinated to the PdCl(Me) fragment, L2 undergoes facile interchange of one PN phenyl with the methyl originating from Pd.
The underappreciated influence of ancillary halide on metal–ligand proton tautomerism
作者:Anant Kumar Jain、Michael R. Gau、Patrick J. Carroll、Karen I. Goldberg
DOI:10.1039/d2sc00279e
日期:——
inner-sphere and phosphines monodentate) that are in equilibrium with the ionic species. Heating is required for the larger anions of bromide and iodide to overcome a kinetic barrier associated with their movement to an inner-sphere position prior to tautormerization. For the fluoride analog, the IrIII–H was not observed, attributable to strong hydrogen bonding interactions of the imidazolyl proton with the
Vaska 型配合物 [IrP 2 X(CO)] (P = 磷化氢,X = 卤化物) 与所有四种常见卤化物(氟化物、氯化物、溴化物和碘化物)的合成尝试使用质子和半可比咪唑基二叔-丁基膦配体。在固态下,发现所有四种配合物都与外层的卤化物呈离子状态,并且配体的咪唑臂占据了方形平面的第四个配位点。然而,在溶液中,发现氯化物络合物在室温下与八面体 Ir III -H 物质处于平衡状态。对于溴化物和碘化物类似物,也观察到相应的 Ir III -H 物质,但仅在加热溶液后。中性 Ir IVaska 的 X = Cl、Br 和 I 的类似物是在添加过量卤化物盐后获得的,尽管 X = Br 和 I 需要加热。Ir III -H 物种被认为源自少量富电子的互变异构化与离子物质平衡的中性 Vaska 类似物(卤化物内球和膦单齿)。较大的溴化物和碘化物阴离子需要加热,以克服与它们在互变异构化之前移动到内球位置相
Comparing Square-Planar Rh<sup>I</sup> and Ir<sup>I</sup>: Metal–Ligand Proton Tautomerism, Fluxionality, and Reactivity
作者:Anant Kumar Jain、Michael R. Gau、Patrick J. Carroll、Karen I. Goldberg
DOI:10.1021/acs.organomet.2c00302
日期:2022.11.28
lower propensity to undergo ligand to metal proton transfer, and in contrast to observations with Ir, the [LHRh][X] complexes (X = Cl, Br, I) do not equilibrate with their metal-protonated congeners. Furthermore, the weaker bond strengths of Rh complexes compared to Ir lead to an increased degree of fluxionality in the former, along with a difference in reactivity with hydrogen (H2) and iodine (I2).
合成并充分表征了一系列带有两个质子咪唑基膦(一个 κ 2 )和一个 CO 配体的低价平面 Rh 配合物[ LH Rh][X](X = PF 6、Br、Cl、I) 。CO 伸缩频率与先前报道的[ LH Ir] [X]配合物的伸缩频率的比较表明 Rh 中心的电子密度要低得多。Rh 的较低电子密度导致配体向金属质子转移的倾向较低,与 Ir 的观察结果相反,[ LH Rh][X]络合物(X = Cl、Br、I)不与其金属质子化同系物平衡。此外,与 Ir 相比,Rh 配合物的键强度较弱,导致前者的流动度增加,以及与氢 (H 2 ) 和碘 (I 2 ) 的反应性差异。
Multimodal Study of Secondary Interactions in Cp*Ir Complexes of Imidazolylphosphines Bearing an NH Group
作者:Douglas B. Grotjahn、John E. Kraus、Hani Amouri、Marie-Noelle Rager、Andrew L. Cooksy、Amy J. Arita、Sara A. Cortes-Llamas、Arthur A. Mallari、Antonio G. DiPasquale、Curtis E. Moore、Louise M. Liable-Sands、James D. Golen、Lev N. Zakharov、Arnold L. Rheingold
DOI:10.1021/ja906712g
日期:2010.6.16
3a-3c and 3e-((15)N)(2)] showed stronger hydrogen bonding to chloride than hydride, though the solid-state structure of 3b evinced intramolecular Ir-H...H-N bonding reinforced by intermolecular N...H-N bonding between unhindered imidazoles. These results are compared to literature examples, which show variations in preferred hydrogen bonding to hydride, halide, CO, and NO ligands. Surprising differences
Bifunctional Imidazolylphosphine Ligands as Hydrogen Bond Donors Promote N−H and O−H Activation on Platinum
作者:Douglas B. Grotjahn、Yi Gong、Antonio G. DiPasquale、Lev N. Zakharov、Arnold L. Rheingold
DOI:10.1021/om060880b
日期:2006.11.1
The NH moieties of two imidazolylphosphine ligands on Pt(II) facilitate formation of trans-(hydrido)((RO)-O-1) bis-(phosphine) Pt(II) species from (ROH)-O-1 (R-1 = CF3CO, CH3CO, Ph, CH3, H). Evidence points to formation of a reliable binding pocket for coordinated (RO)-O-1 by hydrogen bond donation from the two NH groups.