A single centre water splitting dye complex adsorbed on rutile TiO2(110): Photoemission, x-ray absorption, and optical spectroscopy

Weston, Matthew; Reade, Thomas J.; Britton, Andrew J.; Handrup, Karsten; Champness, Neil R.; O'Shea, James N.

doi:doi:10.1063/1.3637497

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Complex orientational ordering of C₆₀ molecules on Au(111)

The orientation and adsorption site for C60 molecules on Au(111) has been studied using low temperature scanning tunneling microscopy. A complex orientational ordering has been observed for molecules inside the “in-phase” (R0°) domain. A 7-molecule cluster consisting a central molecule sitting atop of a gold atom and 6 tilted surrounding molecules is identified as the structural motif. The 2√3 × 2√3-R30° phase consists of molecules bonding to a gold atomic vacancies with a preferred azimuthal or...

Anomalous diffusion governed by a fractional diffusion equation and the electrical response of an electrolytic cell

The electrical response of an electrolytic cell in which the diffusion of mobile ions in the bulk is governed by a fractional diffusion equation of distributed order is analyzed. The boundary conditions at the electrodes limiting the sample are described by an integro-differential equation governing the kinetic at the interface. The analysis is carried out by supposing that the positive and negative ions have the same mobility and that the electric potential profile across the sample satisfies t...

A single centre water splitting dye complex (aqua(2,2′-bipyridyl-4,4′-dicarboxylic acid)-(2,2′:6′,6′′-terpyridine)Ruthenium(II)), along with a related complex ((2,2′-bipyridyl-4,4′-dicarboxylic acid)-(2,2′:6’,6′′-terpyridine)chloride Ruthenium(II)), has been investigated using photoemission and compared to molecules with similar structures. Dye molecules were deposited in situ using ultra-high vacuum electrospray deposition, which allows for the deposition of thermally labile molecules, such as these dye molecules. Adsorption of the dye molecules on the rutile TiO₂(110) surface has been studied using core-level and valence photoemission. Core-level photoemission spectra reveal that each complex bonds to the surface via deprotonation of its carboxylic acid groups. A consideration of the energy level alignments reveals that both complexes are capable of charge transfer from the adsorbed molecules to the conduction band of the rutile TiO₂ substrate.

Article Outline

INTRODUCTION
METHOD
RESULTS AND DISCUSSION
1. Adsorption
2. Electronic structure
CONCLUSIONS

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KEYWORDS and PACS

Keywords

adsorbed layers, adsorption, charge exchange, conduction bands, core levels, dissociation, dyes, electrodeposition, photoelectron spectra, X-ray absorption spectra

PACS

68.43.Mn

Adsorption kinetics
82.30.Lp

Decomposition reactions (pyrolysis, dissociation, and fragmentation)
33.60.+q

Photoelectron spectra
82.30.Fi

Ion-molecule, ion-ion, and charge-transfer reactions
33.20.Rm

X-ray spectra

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.3637497

PUBLICATION DATA

ISSN

0021-9606 (print)

1089-7690 (online)

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American Institute of Physics

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