Induced Migration of CO2from Hydrate Cages to Amorphous Solid Water under Ultrahigh Vacuum and Cryogenic Conditions

• DOI: 10.1021/acs.jpclett.3c00373
• Publication Date: 2023-03-13T14:47:57Z
• Authors: Gaurav Vishwakarma; Bijesh K. Malla; K. S. S. V. Prasa...; Jyotirmoy Ghosh; Soham Chowdhury; Sharma S. R. K. C...; Sandeep K. Reddy; Rajnish Kumar; Thalappil Pradeep
• Keywords: Clathrate hydrate

Restricted migration of reactive species limits chemical transformations within interstellar and cometary ices. We report the CO2 from clathrate hydrate (CH) cages to amorphous solid water (ASW) in presence tetrahydrofuran (THF) under ultrahigh vacuum (UHV) cryogenic conditions. Thermal annealing sequentially deposited H2O ice, CO2@H2O, 90 K resulted partitioning 512 51262 CH (CO2@512, CO2@51262). However, upon preparing a composite ice film composed CO2@512, CO2@51262 THF distributed matrix at K, mixture for 6 h 130 produced mixed CO2-THF CH, where occupied 51264 (THF@51264) exclusively while (CO2@51262) got transferred ASW (CO2@512) remained as is. This cage-matrix exchange may create more conducive environment environments.