Bi- and terpyridyl platinum(II) chloro complexes: Molecular catalysts for the photogeneration of hydrogen from water or simply precursors for colloidal platinum?
Bi- and terpyridyl platinum(II) chloro complexes: Molecular catalysts for the photogeneration of hydrogen from water or simply precursors for colloidal platinum?
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DOI：
10.1021/ja711090w
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发表时间：
2008-04-16
影响因子：
15
通讯作者：
Eisenberg, Richard
中科院分区：
文献类型：
--
作者：
Du, Pingwu;Schneider, Jacob;Eisenberg, Richard
铂(II)双吡啶基和三联吡啶氯络合物Pt (dcbpy)Cl-2和[Pt(ttpy)Cl](+)，其中dcbpy = 4,4'-二羧基-2,2'-联吡啶和ttpy = 4-甲苯基-2,2':6',2"-三联吡啶，用于研究光催化从水中制氢的活性催化剂的性质。在含有牺牲电子供体（MeOH 或三乙醇胺 (TEOA)）和二氧化钛 (TiO2) 作为电子中继的 Pt(II) 氯系统中，在紫外带隙照射下可以观察到大量的 H-2。在相同条件下，使用已知的敏化剂 [Pt(ttpy)(苯乙炔)](+) (1) 可以显着减少 H2 的量。 (11) 氯络合物 在类似的系统中，在可见光 (lambda > 410 nm) 照射下，有一个相当长的诱导期直到 H-2 的产生，这表明 Pt(II) 氯络合物只是充当 Pt 胶体的前体，而 Pt 胶体充当 H-2 生成催化剂。
Platinum(II) bi- and terpyridyl chloro complexes, Pt (dcbpy)Cl-2 and [Pt(ttpy)Cl](+), where dcbpy = 4,4'-dicarboxyl-2,2'-bipyridine and ttpy = 4-tolyl-2,2':6',2"-terpyridine, are used to investigate the nature of the active catalyst for the photocatalytic production of hydrogen from water. In a Pt(II) chloro system that contains a sacrificial electron donor, either MeOH or triethanolamine (TEOA), and titanium dioxide (TiO2) as an electron relay, sizable amounts of H-2 can be observed upon UV bandgap irradiation. The quantity of H2 can be significantly reduced in the presence of mercury under the same conditions. Using a known sensitizer, [Pt(ttpy)(phenylacetylide)](+) (1), combined with a Pt (11) chloro complex in a similar system, there is a substantial induction period until the evolution of H-2, under visible light (lambda > 410 nm) irradiation. It is suggested that the Pt(II) chloro complexes are simply acting as precursors to Pt colloids that function as the H-2 generating catalyst.