3-Methylazasydnone: First Energetic Mesoionic Liquid

Energetic ionic liquids (EILs) have drawn considerableattentionas potential liquid propellant components. However, most known EILsare oxygen-deficient and can be used only with external oxidizer.Herein, we report the first example of energetic mesoionic liquid, 3-methylazasydnone, that can function both as a monopropellantand in bipropellant systems. Methylazasydnone has the highest densityamong the methylated five-membered aromatic heterocycles in the liquidand solid state (1.49 and 1.60 g cm(-3), respectively),shows moderate volatility, good thermal stability, and is insensitiveto impact. The computed performance of liquid propellant'scombustion is superior to that of the benchmark energetic ionic liquid,2-hydroxyethylhydrazinium nitrate (428 vs 424 g & BULL;s cm(-3)). Overall, methylazasydnone is a promising advanced functional materialfor application in green liquid mono- and bipropellants.

Automated summary

This article reports a high-energy mesoionic liquid, 3-methylazasydnone, that can function as both a monopropellant and in bipropellant systems. It has high density, moderate volatility, good thermal stability, and is insensitive to impact. The computed combustion performance of the liquid propellant is superior to a benchmark energetic ionic liquid. Overall, 3-methylazasydnone is a promising functional material for green liquid mono- and bipropellants.