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Enhanced efficiency of the visible-light photocatalytic hydrogen generation by the ruthenium tris(2,2′-bipyridyl)–methyl viologen system in the presence of cucurbit[n]urils

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Photochemical & Photobiological Sciences Vol - 8 Issue - 9

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Enhanced efficiency of the visible-light photocatalytic hydrogen generation by the ruthenium tris(2,2′-bipyridyl)–methyl viologen system in the presence of cucurbit[n]urils

Content Provider	Royal Society of Chemistry (RSC)
Author	Ferrer, Belén Álvaro, Mercedes Silva, Cláudia Gomes García, Hermenegildo Miguel, Maykel de
Copyright Year	2009
Abstract	Cucurbiturils are cyclic oligomers of glycoluril units whose molecular shape defines an internal hollow space accessible through carbonyl portals. It is known that methyl viologen forms strong host–guest complexes with CB[7] and CB[8]. In the latter case even a dimer can be hosted inside CB[8]. Classical solution systems for visible light H2 generation use methyl viologen as an electron relay. In this work we have found that the efficiency for H2 generation of the photocatalytic system comprising EDTA–ruthenium tris(2,2′-bipyridyl)–methyl viologen–Pt increases when cucurbiturils are present in the solution. The enhancement follows the order CB[6] < CB[7] < CB[8]. By means of laser flash photolysis we have established that this efficiency increase arises from the combination of an increase in the relative quantum yield of charge separation (higher efficiency in the formation of MV˙+) and a decrease of MV˙+ lifetime.
Starting Page	1650
Ending Page	1654
Page Count	5
File Format	HTM / HTML PDF
ISSN	1474905X
Volume Number	8
Issue Number	12
Journal	Photochemical & Photobiological Sciences
DOI	10.1039/b9pp00063a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Quantum Laser Paraquat Glycoluril Carbonyl group EDTA Protein dimer Flash photolysis
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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Triplet-mediated photoreduction of viologens by aromatic hydrocarbons. A laser flash-photolysis study

Photodegradation of methyl orange and photoinactivation of bacteria by visible light activation of persulphate using a tris(2,2'-bipyridyl)ruthenium(II) complex.

Visible-light hydrogen generation using as photocatalysts layered titanates incorporating in the intergallery space ruthenium tris(bipyridyl) and methyl viologen.

Photocatalytic Water Oxidation in a Buffered Tris(2,2‘-bipyridyl)ruthenium Complex-Colloidal IrO2 System

Photo -induced Electron Transfer Between Ruthenium (II) tris â€“(2,2 ï‚¢ - bipyrdine ) and Methyl Viologen

Glycoluril derivatives as precursors in the preparation of substituted cucurbit[n]urils

Photocatalytic water oxidation in a buffered tris(2,2′-bipyridyl)ruthenium complex-colloidal iro2 system (2000).

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Enhanced efficiency of the visible-light photocatalytic hydrogen generation by the ruthenium tris(2,2′-bipyridyl)–methyl viologen system in the presence of cucurbit[n]urils

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Enhanced efficiency of the visible-light photocatalytic hydrogen generation by the ruthenium tris(2,2′-bipyridyl)–methyl viologen system in the presence of cucurbit[n]urils