## 1 Introduction  
Hydrofluorocarbons (HFC) are a class of fluorinated compounds used primarily in refrigeration, foam-blowing agents, aerosol propellants, solvents and fire suppressants [1]. These compounds were encouraged after policy change through the Montreal Accord on conventional chloro-fluorinated carbons (CFCs) due to ozone depletion properties [2; 3; 4]. While HFCs are considered a better alternative to the previous components regarding ozone depletion, due to the hydrogen allowing for much faster breakdown periods in the atmosphere, they are still persistent in the air, lasting between 15 and 270 years compared to CFCs that can last over 1000 years [5; 6]. These gases also have an extreme global warming potential (GWP), being 677 times as potent as carbon dioxide in their greenhouse potential 100 years in the atmosphere [5; 7]. In 2020, the US reportedly emitted the CO2 equivalent of 190 million metric tons of fluorinated gases [5]. Thus, providing recycling alternatives to the current separation processes is of great and immediate importance [8]. Difluoromethane is among the most used HFC today for refrigeration and fire suppression. Difluoromethane has received attention from the scientific community for capture and separation through absorption and adsorption, recently through the use of ionic liquids [9]. Complex novel solvents are required for processing HFC refrigerants such as difluoromethane [10; 11]. Ionic liquids, a group of novel solvents, are generally composed of expensive, toxic, or non-biodegradable chemicals which can be detrimental to the environment [12; 13]. Contrarily, deep eutectic solvents (DES) are considered analogues of ionic liquids as they possess many similar physicochemical properties, yet offer cheap, non-toxic, and environmentally benign alternatives [12]. Rather than ionic pairs, DES are formed through combinations of hydrogen bond acceptors (HBA) and hydrogen bond donors (HBD), which develop a significantly depressed eutectic point generally causing them to be liquid at room temperature [14; 15]. DES are currently separated into five types. Two of these types (3 and 5) are attributed with being green solvents, while the other classes contain potentially hazardous metal components [16]. Type five DES are also termed hydrophobic DES or HDES. Due to the relatively nonpolar nature of fluorinated compounds, HBA and HBD, which are prevalent HDES, are examined in this study as they likely ensure the best solubility. Thus far, DES have been extensively studied in their capacity as common greenhouse gas absorbents such as CO\({}_{2}\) and CH\({}_{4}\), gaseous pollutants such as siloxanes, and sulfur contaminants, continuously outperforming conventional solvents in studies [14; 15; 16; 17]. DES have been proven to be highly effective in the capture of greenhouse gases (GHG) [18; 19]. However the application of DES for HFCs, and especially difluoromethane, has yet to be explored as best to the authors knowledge. One barrier for the experimental investigation of DES in this application is the vast number of available HBA, HBD, combinations, and mixture compositions. Thus, to aid in initial explorations of DES-difluoromethane systems, many researchers have relied upon thermodynamic property prediction methods [20; 21; 22]. The conductor-like screening model (COSMO) suite is a thermodynamic property prediction method which employs quantum mechanical calculations, density functional theory, and QSPR methods in order to determine ab initio predictions [23]. COSMO is especially popular among researchers studying ionic liquids and DES, as one remarkable trait of these solvents is their tunability, leading to virtually infinite possible combinations of components and compositions [24; 25; 26; 27].