Mechanical Interatomic Bond Formation in Ethanol and Methanol-Ethanol Mixture by Laser-Driven Shock Waves

Area of Science:

• Physical Chemistry
• Laser-Induced Chemistry
• Organic Synthesis

Background:

• Laser-driven shock waves can induce chemical reactions in molecules.
• Understanding bond formation under extreme conditions is crucial for novel synthesis.
• Ethanol and methanol mixtures are common organic compounds with potential for new reactions.

Purpose of the Study:

• To identify molecules formed by C-C or C-O bond formation in ethanol induced by laser shock waves.
• To investigate the effect of methanol co-irradiation on bond formation.
• To determine the influence of CO2 saturation on reaction products, specifically hemiacetals and acetals.

Main Methods:

• Laser irradiation of ethanol and methanol-ethanol mixtures.
• Gas chromatography-mass spectrometry (GC-MS) for molecular identification.
• Analysis of reaction products under different gas saturations (Argon vs. CO2).

Main Results:

• Identification of molecules formed via C-C and C-O bond formation in ethanol under laser shock.
• Observation of C-C and C-O bond formation between methanol and ethanol.
• Formation of four specific hemiacetals (methoxymethanol, 1-methoxyethanol, ethoxymethanol, 1-ethoxyethanol) in Ar-saturated samples.
• Dominance of acetalization and significant reduction of hemiacetals in CO2-saturated samples.
• Evidence of ethanol fragment dropout supporting laser-driven shock wave mechanisms.

Conclusions:

• Laser-driven shock waves effectively induce C-C and C-O bond formation in alcohols.
• The presence of methanol and CO2 significantly influences the reaction pathways, favoring acetalization over hemiacetal formation.
• The findings support the role of laser-induced shock waves in driving novel organic bond formations.