Abstract
We focus on the unique aspects of biuret and biguanide, which form six-membered ring structures via intramolecular hydrogen bonds. The proton donor and acceptor atoms differ between biuret and biguanide, leading to varying energy barrier heights for proton transfer. We performed path integral molecular dynamics (PIMD) simulations for biuret and biguanide to investigate the correlation between proton transfer and the degree of the delocalization of π-electrons in the six-membered ring framework structure. The results indicate that the π-electrons in the framework structure are delocalized regardless of the ease of intramolecular proton transfer.
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