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Onset of chiral adenine surface growth

AuthorsCapitán, M. J. ; Álvarez, Jesús; Wang, Yang; Otero, Roberto; Alcamí, Manuel; Martín, Fernando; Miranda, Rodolfo
Issue Date2013
PublisherJohn Wiley & Sons
CitationChemphyschem : a European journal of chemical physics and physical chemistry 14: 3294- 3302 (2013)
AbstractThe structure and stability of adenine crystals and thin layers has been studied by using scanning tunneling microscopy, X-ray diffraction, and density functional theory calculations. We have found that adenine crystals can be grown in two phases that are energetically quasi-degenerate, the structure of which can be described as a pile-up of 2D adenine planes. In each plane, the structure can be described as an aggregation of adenine dimers. Under certain conditions, kinetic effects can favor the growth of the less stable phase. These results have been used to understand the growth of adenine thin films on gold under ultra-high vacuum conditions. We have found that the grown phase corresponds to the α-phase, which is composed of stacked prochiral planes. In this way, the adenine nanocrystals exhibit a surface that is enantiopure. These results could open new insight into the applications of adenine in biological, medical, and enantioselective or pharmaceutical fields. Adenine growth: The structure of adenine crystals can be described as a pile-up of adenine planes. Each plane is formed by an aggregation of adenine dimers. The adenine plane growth starts with the formation of dimers that then join to form tetramers (through α2 hydrogen bonds; see figure). These dimers act as nucleation centers for the α-adenine plane growth. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Identifiersdoi: 10.1002/cphc.201300321
issn: 1439-4235
Appears in Collections:(CFMAC-IEM) Artículos
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