Here, we systematically investigate the high-pressure structures and chemical bonding of the Mg 2 C, Mg 2 C 3, and MgC 2 system using the swarm optimization technique in combination with first-principles electronic structure methodology.

2020年11月12日 · Assuming the reagent is Mg2C3, one way to visualize the reaction can be as follows: Purely on oxidation state basis, each Mg will be charged +2, with 2 Mg atoms you get +4 positive charge. That means the anionic end has three carbon atoms required to bear a combined oxidation state of -4.

2023年1月20日 · Three high-pressure magnesium carbides, namely, β-Mg 2 C 3, its high-temperature form γ-Mg 2 C 3, and antifluorite Mg 2 C, have p–T domains of thermodynamic stability. At the same time, the carbides accessible by ambient-pressure synthesis, α-Mg 2 C 3 and MgC 2, are either metastable or unstable, depending …

1992年2月10日 · Hydrolyses of the Mg 2 C 3 and Sc 3 C 4 are compared in the light of the recent crystal structure determinations. The hydrolysis of Mg 2 C 3 yields a mixture of propyne and propadiene, the ratio of which is close to equilibrium values for ambient and higher temperatures, whereas it shifts towards propadiene at low temperatures.

The protolysis of magnesium sesquicarbide, Mg2C3, with inorganic acids provides an interesting alternative to the more common hydrolysis of ionic carbides for obtaining their respective hydrocarbons. In particular, protolysis reactions with ammonium halides as precursors for hydrogen halides were investigated using in situ methods such as TGA ...

碳化镁(Mg2C3)能够与 水 作用发生 水解 生成 丙炔 ，丙二烯是一种重要的基础有机化学原料。 制备方式:3C+2Mg===Mg2C3 (条件:加强热)，可由碳粉与镁粉混合加强热制得。

mg2c3在水中发生水解反应，生成氢氧化镁和乙炔。 该反应可以通过加热mg2c3溶液来促进。 实验操作可以通过观察产生的沉淀物和气泡来验证该反应是否发生。

ABSTRACT: A new monoclinic variation of Mg2C3 was synthesized from the elements under high-pressure (HP), high-temperature (HT) conditions. Formation of the new compound, which can be recovered to ambient conditions, was observed in situ using X-ray diffraction with synchrotron radiation.

Mg2C3 crystallizes in the orthorhombic Pnnm space group. The structure is three-dimensional. Mg2+ is bonded in a 3-coordinate geometry to five C+1.33- atoms. There are a spread of Mg–C bond distances ranging from 2.21–2.47 Å. There are two inequivalent C+1.33- sites.

2015年9月24日 · Recent studies of the magnesium carbide (Mg–C) system under pressure were motivated by the successful high-pressure and high-temperature synthesis of Mg2C and Mg2C3. Here, we systematically investigate the high-pressure structures and chemical bonding of the Mg2C, Mg2C3, and MgC2 system using the swarm optimization technique in combination ...