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Self-Organized Overlayers Formed by Alanine on Cu{311} Surfaces

Madden, DC, Temprano, I, Sacchi, M, Blanco-Rey, M, Jenkins, SJ and Driver, SM (2014) Self-Organized Overlayers Formed by Alanine on Cu{311} Surfaces Journal of Physical Chemistry C, 118 (32). pp. 18589-18603.

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Chirality can manifest itself in diverse ways when a molecule adsorbs on a metal surface. A clear understanding of the interplay between molecular chirality, “footprint chirality”, and chirality in the long-range self-organization is crucial if metal surfaces are to be exploited for enantioselective heterogeneous catalysis or enantio-discriminating sensors. We have investigated the self-organization of l-alanine adsorbed as alaninate on Cu{311}, using reflection–absorption infrared spectroscopy in conjunction with first-principles calculations to determine bonding configurations, and low-energy electron diffraction and scanning tunnelling microscopy to elucidate structural features. Three ordered structures are seen. One has a symmetric lattice and 3-point adsorbate bonding (the “symmetric lattice” or SL phase); the others, occurring at higher coverage, have chiral lattices and also involve 2-point bonding (the “chiral lattice” or CL phase). Possible models for these structures are discussed, together with the roles of footprint chirality and of long-range chirality in the self-organization. These results set the forms of chirality seen in alaninate overlayers on Cu{110} and {100} surfaces into a wider context. The common underlying principles should help in establishing a general framework for understanding the behavior of chiral adsorbates on low-symmetry metal surfaces.

Item Type: Article
Subjects : Chemistry
Divisions : Surrey research (other units)
Authors :
Madden, DC
Temprano, I
Blanco-Rey, M
Jenkins, SJ
Driver, SM
Date : 23 July 2014
DOI : 10.1021/jp505636v
Copyright Disclaimer : © 2014 American Chemical Society
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:55
Last Modified : 25 Jan 2020 00:30

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