Rigid medium stabilization of metal-to-ligand charge transfer excited states

Article Abstract:

A steady-state and time-resolved absorption and emission measurements were used to study the salts [Ru[(bpy).sub.3]][(P[F.sub.6]).sub.2], cis-[Ru[(bpy).sub.2]][(py).sub.2]][(P[F.sub.6]).sub.2],trans-[Ru[(bpy).sub.2]][(4-Etpy).sub.2]][(P[F.sub.6]).sub.2], [Ru[(tpy).sub.2]][(P[F.sub.6]).sub.2] and [Re(bpy)[(CO).sub.3](4-Etpy)](P[F.sub.6]) in which bpy stands for 2,2'-bipyridine, py for pyridine, 4-Etpy for 4-ethylpyridine and tpy for 2,2':6',2-terpyridine, added to poly(methyl methacrylate ) (PMMA) films and their photophysical properties. It is suggested that the inhibition of metal-ligand bond breaking and a photochemical cage effect results in the 'rigid medium stabilization effect ' for cis-[Ru[(bpy).sub.2]][(py).sub.2]][(P[F.sub.6]).sub.2] in PMMA.

Cyclic Crude and Intermediate Manufacturing, Ethylene, Analysis, Electric properties, Chemical reactions, Charge transfer

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Diffusional mediation of surface electron transfer on TiO2

Article Abstract:

Research was conducted to examine the diffusional mediation of surface electron transfer on TiO2. The kinetic study involved the cross-surface electron transfer in the reversible oxidation of (Os(super II)(bpy)2(4,4'-(CO2H)2bpy))(PF6)2 to OsIII surface adsorbed to nanocrystalline TiO2 films. Results demonstrate that the electron-transfer mediation of the oxidative component of the Os(super III/II) surface couple takes place in the presence of added Ru(bpy)(sub 3)(super 2+).

Oxidation-reduction reaction, Oxidation-reduction reactions, Titanium dioxide, Adsorption, Diffusion, Diffusion (Physics)

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Energy transfer from luminescent porous silicon to adsorbed osmium(II) and ruthenium(II) polypyridyl complexes

Article Abstract:

A model was developed to analyze and define the properties of an energy transfer from luminescent porous silicon (p-Si) to adsorbed osmium(II) and ruthenium(II) polypyridyl complex compounds. The complex's surface adsorption on p-Si wafers quenched the emission. Facile energy transfer shifts from the surface to Ru(II) and Os(II) complexes. Such transfer is faster and more efficient for Os(II) than for Ru(II).

Semiconductor wafers, Energy transfer, Osmium, Ruthenium, Phosphors

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