Mapping the force field of a hydrogen-bonded assembly
作者： S. P. Jarvis , Hongqian Sang , I. Lekkas , P. Rahe , Yu Wang
DOI: 10.1038/NCOMMS4931
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摘要: Hydrogen bonding underpins the properties of a vast array systems spanning wide variety scientific fields. From elegance base pair interactions in DNA to symmetry extended supramolecular assemblies, hydrogen bonds play an essential role directing intermolecular forces. Yet fundamental aspects bond continue be vigorously debated. Here we use dynamic force microscopy (DFM) quantitatively map tip-sample field for naphthalene tetracarboxylic diimide molecules hydrogen-bonded two-dimensional assemblies. A comparison experimental images and spectra with their simulated counterparts shows that contrast arises from repulsive whose interpretation can aided via examination charge density depletion across molecular system. Interpreting DFM therefore necessitates detailed consideration coupled tip-molecule system: analyses based on absence tip fail capture physical chemistry underpinning imaging mechanism.
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