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Zwitterionic self-assembly of L-methionine nanogratings on the Ag(111) surface (Articolo in rivista)

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Zwitterionic self-assembly of L-methionine nanogratings on the Ag(111) surface (Articolo in rivista) (literal)

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Alternative label

Schiffrin, A; Riemann, A; Auwarter, W; Pennec, Y; Weber-Bargioni, A; Cvetko, D; Cossaro, A; Morgante, A; Barth, JV (2007)
Zwitterionic self-assembly of L-methionine nanogratings on the Ag(111) surface
in Proceedings of the National Academy of Sciences of the United States of America; National Academy of Sciences, Washington (Stati Uniti d'America)
(literal)

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Schiffrin, A; Riemann, A; Auwarter, W; Pennec, Y; Weber-Bargioni, A; Cvetko, D; Cossaro, A; Morgante, A; Barth, JV (literal)

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Univ British Columbia, Dept Chem, Vancouver, BC V6T 1Z4, Canada; Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z4, Canada; Western Washington Univ, Dept Phys & Astron, Bellingham, WA 98225 USA; Univ Ljubljana, Dept Phys, SI-1001 Ljubljana, Slovenia; Lab Ist Nazl Fis Mat Tecnol Avanzate & Nanosci IF, I-34012 Trieste, Italy; Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy; Tech Univ Munich, Phys Dept E20, D-85478 Garching, Germany (literal)

Titolo

Zwitterionic self-assembly of L-methionine nanogratings on the Ag(111) surface (literal)

Abstract

The engineering of complex architectures from functional molecules on surfaces provides new pathways to control matter at the nanoscale. In this article, we present a combined study addressing the self-assembly of the amino acid L-methionine on Ag(111). Scanning tunneling microscopy data reveal spontaneous ordering in extended molecular chains oriented along high-symmetry substrate directions. At intermediate coverages, regular biomolecular gratings evolve whose periodicity can be tuned at the nanometer scale by varying the methionine surface concentration. Their characteristics and stability were confirmed by helium atomic scattering. X-ray photoemission spectroscopy and high-resolution scanning tunneling microscopy data reveal that the L-methionine chaining is mediated by zwitterionic coupling, accounting for both lateral links and molecular dimerization. This methionine molecular recognition scheme is reminiscent of sheet structures in amino acid crystals and was corroborated by molecular mechanics calculations. Our findings suggest that zwitterionic assembly of amino acids represents a general construction motif to achieve biomolecular nanoarchitectures on surfaces. (literal)

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