Thermal Stability of Encapsulated Molecular Structures with Extended OH-Hydrogen-Bond Chains

Using a coarse-grained model, we performed numerical simulations of the dynamics of linear molecular chains adsorbed on a flat substrate (on the surface of an h-BN crystal). It is shown that molecules containing benzene rings and hydroxyl groups in their structure can form stable hydrogen-bond chains OH$\cdots$OH$\cdots$OH. Such chains can be formed by phenol C${}_6$H${}_5$OH, 4-phenylphenol C${}_6$H${}_5$–C${}_6$H${}_4$OH, paracetamol CH${}_3$C(O)NHC${}_6$H${}_4$OH, and 4-hydroxybenzanilide C${}_6$H${}_5$C(O)NHC${}_6$H${}_4$OH molecules. The dissociation of these chains occurs at temperatures above $T_1=190$, 240, 300, and 400K, respectively. Coating such molecular systems with a hexagonal boron nitride sheet (their van der Waals encapsulation) significantly enhances their thermal stability. Such encapsulated molecular structures retain hydrogen-bond chains up to temperatures of $T_2=470$, 800, 880, and 1140K, respectively. The simulations allow us to conclude that h-BN-encapsulated chains of these molecules can be used to create anhydrous proton-exchange membranes capable of operating at high temperatures. The most promising are encapsulated chains of paracetamol and 4-hydroxybenzanilide molecules.