Chemically Assisted Precompression of Hydrogen Molecules in Alkaline-Earth Tetrahydrides.

Chemically Assisted Precompression of Hydrogen Molecules in Alkaline-Earth Tetrahydrides.
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DOI:
10.1021/acs.jpclett.2c02157
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发表时间:
2022-09-15
影响因子:
5.7
通讯作者:
Howie, Ross T.
Howie, Ross T.
中科院分区:
化学2区
文献类型:
--
作者:
Pena-Alvarez, Miriam;Binns, Jack;Marques, Miriam;Kuzovnikov, Mikhail A.;Dalladay-Simpson, Philip;Pickard, Chris J.;Ackland, Graeme J.;Gregoryanz, Eugene;Howie, Ross T.

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通过一系列高压金刚石对顶砧实验,合成了碱土金属(Ca,Sr,Ba)四氢化物,并通过拉曼光谱、X射线衍射和密度泛函理论计算研究了它们的性质。的tetraphylococcus纳入原子和准分子氢,我们发现,单位的分子内伸缩模式的频率从Ca到Sr和Ba压缩后下移。实验结果表明,主体阳离子越大,键越长。电子定域函数(ELF)分析表明,H-H键的伸长是由金属与H-H键之间的电荷转移和金属主体对H-H键的空间位阻效应引起的。这种效应对于BaH 4是最突出的,其中在50 GPa下单元的预压缩导致键长与275 GPa以上的纯H2的键长相当。
Through a series of high pressure diamond anvil experiments, we report the synthesis of alkaline earth (Ca, Sr, Ba) tetrahydrides, and investigate their properties through Raman spectroscopy, X-ray diffraction, and density functional theory calculations. The tetrahydrides incorporate both atomic and quasi-molecular hydrogen, and we find that the frequency of the intramolecular stretching mode of the units downshifts from Ca to Sr and to Ba upon compression. The experimental results indicate that the larger the host cation, the longer the bond. Analysis of the electron localization function (ELF) demonstrates that the lengthening of the H–H bond is caused by the charge transfer from the metal to and by the steric effect of the metal host on the H–H bond. This effect is most prominent for BaH4, where the precompression of units at 50 GPa results in bond lengths comparable to that of pure H2 above 275 GPa.
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