Evidence of Photoinduced Charge Separation in the Metal-Organic Framework MIL-125(Ti)-NH2

被引：103

作者：

de Miguel, Maykel ^{[1
,2
]}

Ragon, Florence ^{[3
]}

Devic, Thomas ^{[3
]}

Serre, Christian ^{[3
]}

Horcajada, Patricia ^{[3
]}

Garcia, Hermenegildo ^{[1
,2
]}

机构：

[1] Univ Politecn Valencia, Inst Tecnol Quim CSIC UPV, Valencia 46022, Spain

[2] Univ Politecn Valencia, Dept Quim, Valencia 46022, Spain

[3] Univ Versailles St Quentin En Yvelines, Inst Lavoisier CNRS UMR 8180, F-78035 Versailles, France

来源：

CHEMPHYSCHEM | 2012年 / 13卷 / 16期

关键词：

charge separation; clusters; materials science; metal-organic frameworks; photochemistry; INTRAZEOLITE PHOTOCHEMISTRY; TIO2; CLUSTERS; TITANIUM; PHOTOCATALYSTS; GENERATION; REDUCTION; CATALYSIS; ZEOLITES; POLYMERS; BEHAVIOR;

D O I：

10.1002/cphc.201200411

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Herein, we describe the photochemical behavior of the porous metalorganic framework MIL-125(Ti)-NH2, built up from cyclic Ti8O8(OH)(4) oxoclusters and 2-aminoterephthalate ligands. While MIL-125(Ti)-NH2 does not emit upon excitation at 420 nm, laser flash photolyses of dry samples (diffuse reflectance) or aqueous suspensions (transmission) of the solid have allowed detecting a transient characterized by a continuous absorption from 390 to 820 nm decaying in the sub-millisecond timescale, which is quenched by oxygen. This transient has been attributed to the charge-separation state. Firm evidence for this assignment was obtained by lamp irradiation of aqueous suspensions of MIL-125(Ti)-NH2 in the presence of electron-donor (N,N,N'N'-tetramethyl-p-phenylenediamine) or electron-acceptor (methylviologen) probe molecules, which has allowed the visual detection of the corresponding radical ions, in agreement with the occurrence of photoinduced charge separation in MIL-125(Ti)-NH2.

引用

页码：3651 / 3654

页数：4

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