Complex transition metal hydrides incorporating ionic hydrogen: Synthesis and characterization of Na2Mg2FeH8 and Na2Mg2RuH8

Complex transition metal hydrides incorporating ionic hydrogen: Synthesis and characterization of Na2Mg2FeH8 and Na2Mg2RuH8
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含有离子氢的复杂过渡金属氢化物:Na2Mg2FeH8 和 Na2Mg2RuH8 的合成和表征

DOI:
10.1016/j.jallcom.2014.12.113
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发表时间:
2015
影响因子:
6.2
通讯作者:
Orimo
Orimo
中科院分区:
材料科学2区
文献类型:
--
作者:
T.D. Humphries;S. Takagi;G Li;M. Matsuo;T. Sato;M.H. Sorby;S. Deledda;B.C. Hauback;S;Orimo

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合成了一类新的四元过渡金属配合物Na_2Mg_2TH_8(T= Fe,Ru),并用同步辐射X射线衍射和粉末中子衍射确定了它们的结构。这些化合物可以被认为是离子和络合物之间的联系,因为它们独立地结合了离子和共价氢。这些新的同构复杂的过渡金属的结晶在正交空间群Pbam,其中八面体的复杂的氢化物阴离子是由四个Mg 2+和四个Na+阳离子的立方体阵列包围,形成不同的二维层。这些材料的一个有趣的特征是孤立的H−阴离子与四个Na+和两个Mg2+阳离子的扭曲八面体配位,它们在含过渡金属的层之间形成层。通过拉曼和红外光谱首次在四元络合过渡金属氢化物体系中独立地观察到H−阴离子和络合氢化物阴离子的振动模式。
A new class of quaternary complex transition metal hydrides (Na2Mg2TH8(T= Fe, Ru)) have been synthesized and their structures determined by combined synchrotron radiation X-ray and powder neutron diffraction. The compounds can be considered as a link between ionic and complex hydrides in terms of incorporating independently coordinated ionic and covalent hydrogen. These novel isostructural complex transition metal hydrides crystallize in the orthorhombic space groupPbam, where the octahedral complex hydride anion is surrounded by a cubic array of four Mg2+and four Na+cations, forming distinct two-dimensional layers. An intriguing feature of these materials is the distorted octahedral coordination of the isolated H−anions by four Na+and two Mg2+cations, which form layers between the transition metal containing layers. The vibrational modes of the H−anions and complex hydride anion are independently observed for the first time in a quaternary complex transition metal hydride system by Raman and IR spectroscopy.
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