Why In News?

Researchers at the Indian Institute of Science Education and Research, Thiruvananthapuram (IISER-TVM) synthesized magnesium hydridomethylzincate.

What is Magnesium Hydridomethylzincate?

  • Origin: It is a novel chemical compound developed by researchers at the Indian Institute of Science Education and Research, Thiruvananthapuram (IISER-TVM).

  • Chemical Nature & Composition:

    • It is a crystalline, hydride-rich organometallic compound containing magnesium (Mg), zinc (Zn), hydrogen (H), and carbon (C).

    • It maintains structural integrity without relying on bulky supporting ligands.

  • Physical State: It exists as a solid at room temperature.

  • Gas Release & Reaction Dynamics:

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    • Low-Temperature Thermal Decomposition: Under solvent-free and anaerobic conditions, it undergoes reductive elimination at temperatures as low as 80°C, releasing hydrogen and methane while leaving behind elemental magnesium and zinc.

    • Behavior in Solution: When heated in solution to 100°C, it releases hydrogen gas.

    • Molecular Yield: Each unit of the compound's paired molecular structure produces two molecules of hydrogen and two molecules of methane.

    • Successive Stepwise Mechanism: Methane gas emerges before hydrogen, demonstrating that the material releases fuel gases via successive chemical reactions rather than simultaneous breakdown.

Significance of the Research

  • Molecular Storage Platform: Offers a viable molecular platform for the stable storage and controlled release of clean fuel gases.

  • Alternative to Compressed Gas Handling: Provides a safer solid-state alternative to storing and transporting methane and hydrogen as volatile compressed gases under high pressures.

  • Low Thermal Energy Demand: Operates efficiently at lower thermal thresholds (80°C–100°C), reducing the energy penalty traditionally required for solid-state gas desorption.

  • Ligand-Free Design: Eliminates heavy supporting ligand architecture, enhancing active material efficiency.

Source: THEHINDU

PRACTICE QUESTION

Q. In the context of clean energy transition and vehicular emissions, what is "HCNG" (Hythane)? 

(a) High-density compressed nitrogen gas used in agricultural refrigeration.

(b) A blend of hydrogen and compressed natural gas used as an internal combustion engine fuel.

(c) Liquefied heavy hydrocarbons extracted from deep ocean methane clathrates.

(d) A synthetic kerosene substitute derived entirely from microalgae lipids.

Answer: (b)

Explanation: HCNG (or Hythane) is a gaseous blend of hydrogen (typically 18% to 20% by volume) and Compressed Natural Gas (CNG). It is used as a transitional vehicular fuel that improves combustion efficiency and reduces carbon monoxide, hydrocarbon, and particulate emissions compared to conventional natural gas.