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Direct Identification and Determination of Conformational Response in Adsorbed Individual Nonplanar Molecular Species Using Noncontact Atomic Force Microscopy. | LitMetric

AI Article Synopsis

  • Recent advancements in atomic force microscopy (AFM) focus mainly on planar molecules, but studying flexible 3D structures poses challenges.
  • This study enhances noncontact AFM techniques to investigate structural differences in 2H-TPP and Cu-TPP molecules on a copper surface.
  • The findings reveal significant conformational changes and underscore the need to better understand the geometric variability of such complex molecules at the single-molecule level.

Article Abstract

In recent years atomic force microscopy (AFM) at highest resolution was widely applied to mostly planar molecules, while its application toward exploring species with structural flexibility and a distinct 3D character remains a challenge. Herein, the scope of noncontact AFM is widened by investigating subtle conformational differences occurring in the well-studied reference systems 2H-TPP and Cu-TPP on Cu(111). Different saddle-shape conformations of both species can be recognized in conventional constant-height AFM images. To unambiguously identify the behavior of specific molecular moieties, we extend data acquisition to distances that are inaccessible with constant-height measurements by introducing vertical imaging, that is, AFM mapping in a plane perpendicular to the sample surface. Making use of this novel technique the vertical displacement of the central Cu atom upon tip-induced conformational switching of Cu-TPP is quantified. Further, for 2H-TPP two drastically different geometries are observed, which are systematically characterized. Our results underscore the importance of structural flexibility in adsorbed molecules with large conformational variability and, consequently, the objective to characterize their geometry at the single-molecule level in real space.

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Source
http://dx.doi.org/10.1021/acs.nanolett.6b03769DOI Listing

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