The commensurate-to-incommensurate phase transition of an organic monolayer: A high resolution LEED analysis of the superstructures of NTCDA on Ag(111)

Kilian, L.; Stahl, U.; Kossev, Iordan; Sokołowski, M.; Fink, R.; Umbach, E.

doi:10.1016/j.susc.2008.05.025

Cited by 34 publications

(38 citation statements)

References 25 publications

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“…However, differences in the lateral arrangement of NTCDA with respect to PTCDA may principally also be important here. Namely, in the ordered NTCDA monolayer, the anhydride groups are directly facing each other, 45 and hence the accumulation of negative partial charges on these may be suppressed, hence reducing the overall polarization of the molecule and in particular of the core, causing the larger vertical bonding distance compared to PTCDA/Ag͑111͒.…”

Section: B Bonding Mechanisms Of Ptcda To Ag(111)mentioning

confidence: 99%

Normal-incidence x-ray standing-wave determination of the adsorption geometry of PTCDA on Ag(111): Comparison of the ordered room-temperature and disordered low-temperature phases

et al. 2010

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Normal incidence x-ray standing wave ͑NIXSW͒ experiments have been performed for monolayers of 3,4,9,10-perylene-tetracarboxylic-dianhydride ͑PTCDA͒ adsorbed on the Ag͑111͒ surface. Two phases were analyzed: the low-temperature phase ͑LT phase͒, which is disordered and obtained for deposition at substrate temperatures below 150 K, and the ordered phase, which is obtained for deposition at room temperature ͑RT phase͒. From the NIXSW analysis the vertical bonding distances to the Ag surface were obtained for the averaged carbon atoms and the two types of chemically different oxygen atoms in the terminal anhydride groups. For the LT phase, we find about 2% ͑0.05 Å͒ and 8% ͑0.21 Å͒ smaller averaged bonding distances for the C and O atoms, respectively, compared to the RT phase. In both phases, the planar geometry of the free molecule is distorted; in particular, the carboxylic O atoms are closer to the surface by 0.20 Å ͑RT͒ and 0.31 Å ͑LT͒ with respect to the averaged C distance. The difference between the vertical bonding distances of the carboxylic and anhydride O atoms is found to be 0.32 ͑RT͒ and 0.33 Å ͑LT͒. These structural parameters of the two phases are compared to those of PTCDA monolayers adsorbed on Au͑111͒ and Cu͑111͒ surfaces and are discussed in the frame of current bonding models.

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Section: B Bonding Mechanisms Of Ptcda To Ag(111)mentioning

confidence: 99%

Normal-incidence x-ray standing-wave determination of the adsorption geometry of PTCDA on Ag(111): Comparison of the ordered room-temperature and disordered low-temperature phases

et al. 2010

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“…The latter groups, for example, open up the possibility to interact with neighboring molecules via hydrogen bonding, which could effectively influence lateral ordering and which may compete with site specific molecule-substrate interactions. [10][11][12] Internal multipole moments represent another important lateral interaction mechanism of large organic molecules; NTCDA and PTCDA, for example, display pronounced quadrupole moments and lateral ordering as well as 2D-island growth have been associated with this specific property. 11,13 NTCDA adsorption on Ag(111) has been investigated with several experimental methods such as spot profile analysis low-energy electron diffraction (SPA-LEED), [10][11][12] temperature programmed desorption (TPD), 10 STM, 10, 12 XPS, 11, 14-17 ultraviolet photoemission spectroscopy (UPS), 14,17 NEXAFS, 11,[14][15][16][17][18][19] and normal incidence x-ray standing wave (NIXSW).…”

Section: Introductionmentioning

confidence: 99%

Vibrational properties of the compressed and the relaxed 1,4,5,8-naphthalene-tetracarboxylic dianhydride monolayer on Ag(111)

Braatz

Öhl

Jakob

2012

The Journal of Chemical Physics

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Layers of 1,4,5,8-naphthalene-tetracarboxylic dianhydride (NTCDA) grown on Ag(111) at about 80 K have been investigated using Fourier transform infrared spectroscopy, spot profile analysis low-energy electron diffraction, and temperature programmed desorption. Specifically, the compressed and the relaxed monolayer, as well as the transformation between the two ordered phases have been analyzed in detail. It is found that the two monolayer phases display distinctly different vibrational spectra and can thus be discriminated with high accuracy and sensitivity. For the NTCDA/Ag(111) monolayer strong in-plane vibrational modes point at a marked dynamic charge transfer between molecule and metal substrate and provide clear evidence for an efficient electronic coupling to the Ag(111) surface in conjunction with a partially filled electronic level at the Fermi energy. The bilayer, on the other hand, is largely electronically decoupled from the substrate and, according to the vanishing infrared-active in-plane vibrational modes, is oriented parallel to the surface. On the basis of spectroscopic data the metastable nature of the bilayer phase is identified as such, leading to an improved understanding of processes encountered in the course of layer preparation and resolving inconsistencies reported in the literature.

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“…Up to the present, many physisorbed self-assemblies have been investigated by scanning tunneling microscopy (STM) [1][2][3][4][5][6][7][8][9][10][11][12], infrared spectroscopy (IR) [16][17][18], low energy electron diffraction (LEED), etc. [19][20][21][22]. Relying on its ability to provide atomic resolution in real space, STM has become one of the most powerful tools for investigations of structural and electronic properties of the SAMs [23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Self-assembly of 2,6-naphthalenedicarboxylic acid and 4,4′-biphenyldicarboxylic acid on highly oriented pyrolytic graphite and Au(111) surfaces

Pei¹,

Lin²,

Zhang³

et al. 2010

Electrochimica Acta

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The commensurate-to-incommensurate phase transition of an organic monolayer: A high resolution LEED analysis of the superstructures of NTCDA on Ag(111)

Cited by 34 publications

References 25 publications

Normal-incidence x-ray standing-wave determination of the adsorption geometry of PTCDA on Ag(111): Comparison of the ordered room-temperature and disordered low-temperature phases

Normal-incidence x-ray standing-wave determination of the adsorption geometry of PTCDA on Ag(111): Comparison of the ordered room-temperature and disordered low-temperature phases

Vibrational properties of the compressed and the relaxed 1,4,5,8-naphthalene-tetracarboxylic dianhydride monolayer on Ag(111)

Self-assembly of 2,6-naphthalenedicarboxylic acid and 4,4′-biphenyldicarboxylic acid on highly oriented pyrolytic graphite and Au(111) surfaces

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