Formation of Magnesium and Aluminum Oxides from Water and Metal Hydrides: Creation of the Smallest Ruby

Formation of Magnesium and Aluminum Oxides from Water and Metal Hydrides: Creation of the Smallest Ruby
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从水和金属氢化物中形成镁和氧化铝:最小红宝石的诞生

DOI:
10.1021/acsearthspacechem.1c00324
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发表时间:
2022
影响因子:
3.4
通讯作者:
Fortenberry, Ryan C.
Fortenberry, Ryan C.
中科院分区:
化学3区
文献类型:
--
作者:
Grosselin, Daniel;Fortenberry, Ryan C.

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水分子与铝烷(AlH 3)或氢化镁(MgH 2)的反应最终产生具有周围氢原子的金属氧化物簇。这项量子化学研究表明,这样的反应最初是通过产生配位键合的中间体而无障碍地进行的,然后经过一个过渡态,其中两个氢原子彼此非常接近,然后喷射出一个氢分子,产生一个非常有利的产物。氢分子可以耗散动能,促进金属氢氧化物产物的形成,而不是简单地将中间体分开。该反应随后连续进行,最终在本研究中产生氢化的α-羟基磷灰石单体和氢化的方镁石二聚体,这是两种著名的陆地矿物。然后,这些簇可能会相互反应,自催化更大的反应网络。这种方法可以补充或甚至与生产无机氧化物共价网络分子簇或甚至更大的矿物颗粒的其他方法竞争。
The reaction of water molecules with alane (AlH3) or magnesium hydride (MgH2) ultimately produces metal oxide clusters with surrounding hydrogen atoms. This quantum chemical study shows that such reactions proceed initially barrierlessly by creating dative-bonded intermediates, then go through a transition state, where two of the hydrogen atoms come within close proximity of one another, and then eject a hydrogen molecule, producing a strongly favored product. The hydrogen molecule can dissipate the kinetic energy, promoting the formation of the metal hydroxide products as opposed to simply breaking the intermediate apart. This reaction then proceeds consecutively, ultimately producing, in this study, a hydrogenated corundum monomer and hydrogenated periclase dimer, two notable terrestrial minerals. These clusters can likely then react with each other, self-catalyzing a larger reaction network. Such processes may complement or even compete with other means of producing inorganic oxide covalent network molecular clusters or even larger mineral grains.
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