Irreversible Chemical Reactions Visualized in Space and Time with 4D Electron Microscopy

被引：26

作者：

Park, Sang Tae ^{[1
]}

Flannigan, David J. ^{[1
]}

Zewail, Ahmed H. ^{[1
]}

机构：

[1] CALTECH, Arthur Amos Noyes Lab Chem Phys, Phys Biol Ctr Ultrafast Sci & Technol, Pasadena, CA 91125 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2011年 / 133卷 / 06期

基金：

美国国家科学基金会;

关键词：

THIN-FILMS; COMPLEXES; COPPER; NANOSCALE; SPECTRA; CUTCNQ;

D O I：

10.1021/ja110952k

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report direct visualization of irreversible chemical reactions in space and time with 4D electron microscopy. Specifically, transient structures are imaged following electron transfer in copper-tetracyanoquinodimethane [Cu(TCNQ)] crystals, and the oxidation/reduction process, which is irreversible, is elucidated using the single-shot operation mode of the microscope. We observed the fast, initial structural rearrangement due to Cu(+) reduction and the slower growth of metallic Cu(0) nanocrystals (Ostwald ripening) following initiation of the reaction with a pulse of visible light. The mechanism involves electron transfer from TCNQ anion-radical to Cu(+), morphological changes, and thermally driven growth of discrete Cu nanocrystals embedded in an amorphous carbon skeleton of TCNQ This in situ visualization of structures during reactions should be extendable to other classes of reactive systems.

引用

页码：1730 / 1733

页数：4

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