Self-assembly of Adenine on Cu(110) Surfaces

Q Chen, DJ Frankel, Neville Vincent Richardson

Research output: Contribution to journalArticlepeer-review

147 Citations (Scopus)

Abstract

The adsorption of the nucleic acid base, adenine, on Cu(110) surface has been studied with low-energy electron diffraction, scanning tunneling microscopy (STM), electron energy loss spectroscopy (EELS), and ab initio calculations. STM shows at low coverage an ordered one-dimensional molecular chain growing along (+/-1, 2) directions. At higher coverages, on annealing to 430 K, the chains order into chiral domains of ((1)(2)(6)(0)) periodicity. High-resolution STM images reveal the details of molecular structure within the unit cell. EELS shows that the molecular plane is parallel to the substrate with a tilted C-NH2 bond. Ab initio calculations confirm the molecular orientation and show an sp(3) hybridization on the N (amino) atom, which is directly bonded to the substrate, The origin of the chains lies in the formation of homochiral rows of molecules, linked by two types of H-bonding interactions, commensurate with the substrate.

Original languageEnglish
Pages (from-to)3219-3225
Number of pages7
JournalLangmuir
Volume18
Issue number8
DOIs
Publication statusPublished - 16 Apr 2002

Keywords

  • SCANNING-TUNNELING-MICROSCOPY
  • NUCLEIC-ACID BASES
  • INFRARED-SPECTRA
  • MATRIX-ISOLATION
  • DNA OLIGOMER
  • ADSORPTION
  • MOLECULES
  • GLYCINE
  • GRAPHITE
  • AU(111)

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