Photostability, Electrochemistry, and Monolayers of [M(bpy)2(trans-1,2-bis(4-pyridyl)ethylene)L]+ (M = Ru, Os; L = Cl, H2O)

Forster, Robert J.; Figgemeier, Egbert; Lees, Anthea C.; Hjelm, Johan; Vos, Johannes G.

doi:10.1021/la0007170

Cited by 21 publications

(9 citation statements)

References 19 publications

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“…This is somewhat surprising because a negatively charged ion in the ligand sphere should screen one of the charges of the metal ion very efficiently. It should also be considered that the chloro ligand can be split off easily and be replaced by a neutral solvent molecule under room light conditions . This therefore would lead as well to a 2+ species on the surface.…”

Section: Resultsmentioning

confidence: 99%

Self-Assembled Monolayers of Ruthenium and Osmium Bis-Terpyridine ComplexesInsights of the Structure and Interaction Energies by Combining Scanning Tunneling Microscopy and Electrochemistry

et al. 2003

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Self-assembled monolayers of [Ru(terpy)(terpy-py)]2+ and [Os(terpy)(terpy-py)]2+ salts (terpy is 2,2‘:6‘,2‘ ‘-terpyridine and terpy-py is 4‘-(4-pyridyl)-2,2‘:6‘,2‘ ‘-terpyridine) on platinum were investigated by means of STM and electrochemistry. The STM experiments reveal that the species within the monolayer are ordered in a hexagonal array. This information was utilized together with the scan rate dependency of the peak current density (j p) of potential sweep experiments to calculate interaction energies within the monolayer. Significantly, the repulsive interactions within the monolayers of 2,2‘:6‘,2‘ ‘-terpyridine complex are greater than those observed with analogous 2,2‘-bipyridine species. This results in a lower overall surface coverage, an ordered structure where each particle has 6 closest neighbors, and a shift of the redox potentials toward more positive values with the terpy complexes. Also, a correlation between the solvent dielectric constant and the interaction energies could be established, reflecting the different ability of the solvent to screen charges depending upon its polarity.

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Section: Resultsmentioning

confidence: 99%

Self-Assembled Monolayers of Ruthenium and Osmium Bis-Terpyridine ComplexesInsights of the Structure and Interaction Energies by Combining Scanning Tunneling Microscopy and Electrochemistry

et al. 2003

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“…Recently Forster et al (18) reported the photosubstitution of chlorido for aqua ligands in an Ru(II) polypyridyl complex, [Ru(bpy) 2 (4-pyridyl)ethylene]. The complex forms well-defined SAMs and undergoes loss of either the bpe anchoring ligand or the chlorido ligand, depending on the solvent employed, with aqueous solvents favoring the substitution of the latter ligand.…”

Section: Photochemically Reactive Self-assembled Monolayers: Irreversmentioning

confidence: 99%

Light Switching of Molecules on Surfaces

Browne

Feringa

2009

Annu. Rev. Phys. Chem.

274

254

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Smart surfaces, surfaces that respond to an external stimulus in a defined manner, hold considerable potential as components in molecular-based devices, not least as discrete switching elements. Many stimuli can be used to switch surfaces between different states, including redox, light, pH, and ion triggers. The present review focuses on molecular switching through the electronic excitation of molecules on surfaces with light. In developing light-responsive surfaces, investigators face several challenges, not only in achieving high photostationary states and fully reversible switching, but also in dealing with fatigue resistance and the effect of immobilization itself on molecular properties. The immobilization of light-responsive molecules requires the design and synthesis of functional molecular components both to achieve light switching and to anchor the molecular entity onto a surface. This review discusses several demonstrative examples of photoswitchable molecular systems in which the photochemistry has been explored in the immobilized state under ambient conditions and especially on electroactive surfaces, including self-assembled monolayers, bilayers, and polymer films.

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“…In particular, for the monomeric dye, the stability is surprising because it was shown earlier that the complex cis-Ru(bpy) 2 (SCN) 2 (bpy = 2,2'bipyridine) undergoes photo-induced replacement of the SCN − ligand [58]. Generally, it was shown that mono-dentate ligands in Ru complexes are easily replaced, under irradiation, by solvent molecules due to population of anti-bonding orbitals [59]. It was postulated that the rapid injection into the conduction band of the TiO 2 suppresses the abstraction of the SCN − ligands.…”

Section: Ru-complexesmentioning

confidence: 99%

Are dye‐sensitized nano‐structured solar cells stable? An overview of device testing and component analyses

Figgemeier

Hagfeldt

2004

International Journal of Photoenergy

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The nano-structured dye-sensitized solar cell (DNSC) is considered as a promising technology having the potential to significantly decrease the costs of solar energy. The breakthrough was achieved in 1991 with the demonstration of a DNSC system reaching more than 7% efficiency and after a decade of intense research the commercialization is in reach. Besides efficiency, stability is equally important for the step from research to the market. Therefore, the stability of such devices has been under close investigation since the DNSC was presented. In this contribution we summarize the literature about device testing and the attempts to understand the degradation mechanisms. Solar cells developed for energy production are discussed as well as alternative systems for low power applications, e.g., DNSCs on plastic substrates. The components (substrate, nano-structuredTiO2, dye, electrolyte, additive and counter electrode) are analyzed towards their stability and how it affects the durability of the entire system. From this analysis, guidelines for testing and improving the stability of the DNSC are deduced.

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Photostability, Electrochemistry, and Monolayers of [M(bpy)₂(trans-1,2-bis(4-pyridyl)ethylene)L]⁺ (M = Ru, Os; L = Cl, H₂O)

Cited by 21 publications

References 19 publications

Self-Assembled Monolayers of Ruthenium and Osmium Bis-Terpyridine ComplexesInsights of the Structure and Interaction Energies by Combining Scanning Tunneling Microscopy and Electrochemistry

Self-Assembled Monolayers of Ruthenium and Osmium Bis-Terpyridine ComplexesInsights of the Structure and Interaction Energies by Combining Scanning Tunneling Microscopy and Electrochemistry

Light Switching of Molecules on Surfaces

Are dye‐sensitized nano‐structured solar cells stable? An overview of device testing and component analyses

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