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New insights into the dihydrogen bonds (MHδ−···Hδ+X) in CpM(PMe3)(L)2H···HX (M=Cr, Mo, W; L=PMe3, CO; X=F, OH, NH2)

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Abstract

Dihydrogen bonds (DHBs) play a fundamental role in catalytic processes, organometallic reaction mechanisms, and potential hydrogen storage materials. In this work, we analyzed the interactions of transition metal (TM) hydrides CpM(PMe3)(L)2H (M=Cr, Mo, W; L=PMe3, CO) with poor, moderate, and strong proton donors HX (NH3, H2O, and HF), and focus on the DHBs in these complexes. All important factors that can affect the DHBs have been considered: transition metal, proton donor, and substituent group. Electrostatic potential (ESP) analysis, topological (atoms in molecules) analysis and noncovalent interactions index (NCI) analysis of the electron density, energy decomposition analysis (EDA) and the effect of electric field were applied to better understand the nature of the DHBs (MHδ−···Hδ+X) in CpM(PMe3)(L)2H···HX (M=Cr, Mo, W; L=PMe3, CO; X=F, OH, NH2). The calculated results showed that both the MHδ−···Hδ+X bonds and M···Hδ+X bonds can form in CpM(PMe3)(L)2H···HX complexes. Electron-rich 5d metal (W in this case) hydrides have a greater chance of forming M···Hδ+X bonds rather than MHδ−···Hδ+X bonds. Cr is more likely to form DHBs than Mo and W. This is a very inspiring finding because this may indicate that the first-row transition metal, which shows low cost, low toxicity, and exceptional synthetic versatility, is more suitable for catalytic hydrogenation. The type of proton donor and the substituting of PMe3 by CO can alter the strength of DHBs. The stronger proton donor involves the stronger DHBs form. The substitution of CO decreases the strength of the dihydrogen bond. Both the electrostatic interaction and the orbital interaction play important roles in DHBs, R (Hδ−···Hδ+) = 1.6 Å seems to be the boundary between these two kinds of interactions. The addition of electric field is conducive to H2 formation for strong DHB complexes, while it has no effect on the weak DHB complexes.

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Funding

This work was supported by the Education Department Foundation of Hebei Province (Contract No. ZD2018066) and Natural Science Fundation of Hebei Province(B2016205042).

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Authors and Affiliations

  1. College of Chemistry and Material Science, Hebei Normal University, Road East of 2nd Ring South, Shijiazhuang, 050024, China

    Yaru Dang, Na Zhang & Xiaoyan Li

  2. National Demonstratin Center for Experimental Chemistry, Hebei Normal University, Road East of 2nd Ring South, Shijiazhuang, 050024, China

    Zheng Sun

  3. The Laboratory of Theoretical and Computational Chemistry, School of Chemistry and Chemical Engineering, Yantai University, Yantai, 264005, People’s Republic of China

    Qingzhong Li

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  1. Yaru Dang
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Dang, Y., Zhang, N., Sun, Z. et al. New insights into the dihydrogen bonds (MHδ−···Hδ+X) in CpM(PMe3)(L)2H···HX (M=Cr, Mo, W; L=PMe3, CO; X=F, OH, NH2). Struct Chem 30, 1819–1830 (2019). https://doi.org/10.1007/s11224-019-01313-0

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