Sn(IV) Metalloporphyrin/Co(III) Complex: An All-Abundant-Element System for the Photocatalytic Production of H2 in Aqueous Solution.
Sn(IV) Metalloporphyrin/Co(III) Complex: An All-Abundant-Element System for the Photocatalytic Production of H2 in Aqueous Solution.
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Sn(IV) 金属卟啉/Co(III) 配合物:用于在水溶液中光催化生产 H2 的全丰富元素系统
DOI:
10.1021/acs.jpcb.5b03106
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
Ph. Kurz
中科院分区:
文献类型:
--
作者:
L. Mintrop;J. Windisch;C. Gotzmann;R. Alberto;B. Probst;Ph. Kurz
A new, molecular system for the light-driven production of hydrogen in aqueous solution was developed by combining a water-soluble tin porphyrin ([SnIVCl2TPPC],A) acting as photosensitizer with a cobalt-based proton-reduction catalyst ([CoIIICl(dmgH)2(py)],C). Under visible light illumination and with triethanolamine (TEOA) as electron source, the system evolves H2for hours and is clearly catalytic in both dye and catalyst. A detailed analysis of the relevant redox potentials in combination with time-resolved spectroscopy resulted in the development of a Z-scheme type model for the flow of electrons in this system. Key intermediates of the proposed mechanism for the pathway leading to H2are the porphyrin dye’s highly oxidizing singlet excited state1A*(E∼ +1.3 V vs NHE), its strongly reducing isobacteriochlorin analogue (E∼ +0.95 V), and the CoIform ofC(E∼ −0.8 V), acting as catalyst for H2formation. Among other results, the suggested reaction sequence is supported by the detection of a shortened excited-state lifetime for singlet1A*(τ ∼ 1.75 ns) in the presence of TEOA and the ultraviolet–visible detection of the SnIVisobacteriochlorin intermediate at λ = 610 nm. Thus, a molecular, conceptually biomimetic, and precious-metal-free reaction chain was found which photocatalytically generates H2in a 100% aqueous system from an electron donor with a high oxidation potential (E(TEOA) ∼ +1.1 V). On the other hand, at identical conditions, this photoreaction chain yields H2markedly slower than a system using the photosensitizer [ReI(CO)3(bpy) (py)]+, probably due to the much longer excited-state lifetime (τ ∼ 120 ns) of the rhenium dye and better electron-transfer rates caused by its simple single-electron photoreduction chemistry.
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DOI:
10.1073/pnas.85.14.5249
发表时间:
1988
影响因子:
11.1
作者:
Land,EJ;McDonagh,AF;McGarvey,DJ;Truscott,TG
通讯作者:
Truscott,TG
DOI:
--
发表时间:
1987
期刊:
影响因子:
--
作者:
Jin Wenrui;Liu Kun
通讯作者:
Liu Kun
影响因子:
--
作者:
HARRIMAN, A;RICHOUX, MC;NETA, P
通讯作者:
NETA, P
影响因子:
32.5
作者:
Kim, Wooyul;Tachikawa, Takashi;Choi, Wonyong
通讯作者:
Choi, Wonyong
DOI:
--
发表时间:
1984
期刊:
影响因子:
--
作者:
S. Baral;P. Hambright;P. Neta
通讯作者:
P. Neta