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Interaction of molecular hydrogen with alkali and transition metal-doped acetylene complexes

机译:分子氢与碱和过渡金属掺杂的乙炔配合物的相互作用

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Comparative study of H-2 interaction with Na-acetylene(C2H2Na), K-acetylene(C2H2K), Li-acetylene(C2H2Li), and Ti-acetylene(C2H2Ti) complexes has been carried out using second-order Moller-Plesset method with 6-311 ++G** basis set. The C2H2Na, C2H2K, C2H2Li, and C2H2Ti complexes can adsorb a maximum of six, seven, four, and five hydrogen molecules with H-2 uptake capacities of 19.79, 17.81, 19.62, and 12 wt%, respectively. The hydrogen adsorption energies with zero-point energy and Gibbs free energy correction show that hydrogen adsorption on alkali metal-doped acetylene complexes is energetically unfavorable at all temperatures considered here, whereas it is energetically favorable for Ti-acetylene complex. The kinetic stability of these complexes is studied using HOMO-LUMO gap, and some selected vibrational modes in these complexes are also studied. Most of the vibrational modes upon H-2 adsorption are red-shifted. Although all the hydrogen-adsorbed complexes are kinetically stable, the H-2-adsorbed Ti-acetylene complex is more stable than the H-2-adsorbed alkali metal-doped acetylene complexes.
机译:H-2与Na-乙炔(C2H2Na),K-乙炔(C2H2K),Li-乙炔(C2H2Li)和Ti-乙炔(C2H2Ti)配合物的H-2相互作用的比较研究已采用Moller-Plesset二阶6-311 ++ G **基础套装。 C2H2Na,C2H2K,C2H2Li和C2H2Ti络合物最多可吸附六个,七个,四个和五个氢分子,其H-2吸收能力分别为19.79、17.81、19.62和12 wt%。具有零点能量和吉布斯自由能校正的氢吸附能表明,在这里考虑的所有温度下,碱金属掺杂乙炔配合物的氢吸附在能量上都是不利的,而钛乙炔配合物在能量上是有利的。使用HOMO-LUMO间隙研究了这些配合物的动力学稳定性,并研究了这些配合物中的某些振动模式。 H-2吸附后的大多数振动模式都发生了红移。尽管所有氢吸附的配合物在动力学上都是稳定的,但H-2吸附的Ti-乙炔配合物比H-2吸附的碱金属掺杂乙炔配合物更稳定。

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