Molecules 2010, 15(7), 4908-4923; doi:10.3390/molecules15074908
Article

Syntheses, Characterization, and Photo-Hydrogen-Evolving Properties of Tris(2,2'-bipyridine)ruthenium(II) Derivatives Tethered to an H2-Evolving (2-phenylpyridinato)platinum(II) Unit

Masayuki Kobayashi, Shigeyuki Masaoka and Ken Sakai* email
Department of Chemistry, Faculty of Science, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
* Author to whom correspondence should be addressed.
Received: 25 May 2010; in revised form: 1 July 2010 / Accepted: 14 July 2010 / Published: 14 July 2010
(This article belongs to the Special Issue Photochemistry in Organic Synthesis)
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Abstract: With the aim of developing new molecular devices having higher photo-hydrogen-evolving activity, Pt(ppy)ClX units (ppy = 2-phenylpyridinate, X = Cl- or DMSO; DMSO = dimethylsulfoxide) have been employed as an H2-evolving site, as the catalytic activity of [Pt(ppy)Cl2]- was confirmed to be higher than those of other mononuclear platinum(II) complexes. In the present study, two new heterodinuclear Ru(II)Pt(II) complexes, produced by condensation of [Ru(bpy)2(5-amino-phen)]2+ (bpy = 2,2'-bipyridine, phen = 1,10-phenanthroline) with [Pt(cppy)Cl2]- and Pt(cppy)(DMSO)Cl (cppy = 9-carboxy-phenylpyridinate), respectively, have been prepared and their photo-hydrogen-evolving activities have been evaluated in detail. The ineffectiveness of these systems as photo-hydrogen-evolving molecular devices are interpreted in terms of their negative driving forces for the photoinduced electron transfer from the triplet MLCT excited state of the Ru chromophore to the p*(ppy) orbital of the catalyst moiety.
Keywords: solar energy conversion and storage; hydrogen energy; photocatalysis; platinum(II) catalysts; ruthenium complexes; molecular devices

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MDPI and ACS Style

Kobayashi, M.; Masaoka, S.; Sakai, K. Syntheses, Characterization, and Photo-Hydrogen-Evolving Properties of Tris(2,2'-bipyridine)ruthenium(II) Derivatives Tethered to an H2-Evolving (2-phenylpyridinato)platinum(II) Unit. Molecules 2010, 15, 4908-4923.

AMA Style

Kobayashi M, Masaoka S, Sakai K. Syntheses, Characterization, and Photo-Hydrogen-Evolving Properties of Tris(2,2'-bipyridine)ruthenium(II) Derivatives Tethered to an H2-Evolving (2-phenylpyridinato)platinum(II) Unit. Molecules. 2010; 15(7):4908-4923.

Chicago/Turabian Style

Kobayashi, Masayuki; Masaoka, Shigeyuki; Sakai, Ken. 2010. "Syntheses, Characterization, and Photo-Hydrogen-Evolving Properties of Tris(2,2'-bipyridine)ruthenium(II) Derivatives Tethered to an H2-Evolving (2-phenylpyridinato)platinum(II) Unit." Molecules 15, no. 7: 4908-4923.

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