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Light-tuned selective photosynthesis of azo- and azoxy-aromatics using graphitic C3N4.

Abstract：

:Solar-driven photocatalysis has attracted significant attention in water splitting, CO2 reduction and organic synthesis. The syntheses of valuable azo- and azoxyaromatic dyes via selective photoreduction of nitroaromatic compounds have been realised using supported plasmonic metal nanoparticles at elevated temperatures (≥90 °C); however, the high cost, low efficiency and poor selectivity of such catalyst systems at room temperature limit their application. Here we demonstrate that the inexpensive graphitic C3N4 is an efficient photocatalyst for selective syntheses of a series of azo- and azoxy-aromatic compounds from their corresponding nitroaromatics under either purple (410 nm) or blue light (450 nm) excitation. The high efficiency and high selectivity towards azo- and azoxy-aromatic compounds can be attributed to the weakly bound photogenerated surface adsorbed H-atoms and a favourable N-N coupling reaction. The results reveal financial and environmental potential of photocatalysis for mass production of valuable chemicals.

journal_name

Nat Commun

journal_title

Nature communications

authors

Dai Y,Li C,Shen Y,Lim T,Xu J,Li Y,Niemantsverdriet H,Besenbacher F,Lock N,Su R

doi

10.1038/s41467-017-02527-8

subject

Has Abstract

pub_date

2018-01-04 00:00:00

pages

60

issue

1

issn

2041-1723

pii

10.1038/s41467-017-02527-8

journal_volume

9

pub_type

杂志文章

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