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Clarification of proton transfer mechanisms is crucial to the development of proton exchange membrane fuel cells (PEMFCs). Nitrogen-containing heterocyclic compounds (e.g., imidazole derivatives) are well known for their potential to assist proton hopping through hydrogen bond networks at high temperatures. Among the many imidazole derivatives reported thus far, 1,3,5-tri(2-benzimidazolyl)benzene...