Visible Light Driven Aerobic Oxidation of Amines and N-Heterocycles Catalyzed by (001) Facet Rich TiO2 Nanocrystals

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2025-04-19 DOI:10.1007/s10562-025-05006-8

Raji Vadakkekara

{"title":"Visible Light Driven Aerobic Oxidation of Amines and N-Heterocycles Catalyzed by (001) Facet Rich TiO2 Nanocrystals","authors":"Raji Vadakkekara","doi":"10.1007/s10562-025-05006-8","DOIUrl":null,"url":null,"abstract":"<div><p>This article reports a facile, fluoride-free hydrothermal synthesis of highly active anatase TiO<sub>2</sub> nanocrystals with a high percentage of (001) facets. These (001)-faceted TiO<sub>2</sub> catalysts exhibit remarkable activity in the visible-light-induced oxidation of various amines, including aliphatic, primary, secondary amines, and N-heterocycles, as well as in amine cross-coupling reactions under ambient air conditions. The high reactivity is attributed to the formation of a surface complex between the amine and the TiO<sub>2</sub> (001) facet, which acts as a visible-light sensitizer, modifying the band structure of TiO<sub>2</sub> and facilitating efficient charge separation and subsequent oxidation processes. Notably, these reactions proceed effectively under visible light irradiation despite the inherent UV-light absorption of TiO<sub>2</sub>. The catalyst demonstrates excellent recyclability with minimal activity loss over six cycles and can be utilized for the gram-scale synthesis of imines, making it a promising and sustainable approach for amine oxidation reactions.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 5","pages":""},"PeriodicalIF":2.3000,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Catalysis Letters","FirstCategoryId":"92","ListUrlMain":"https://link.springer.com/article/10.1007/s10562-025-05006-8","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}

引用次数: 0

Abstract

This article reports a facile, fluoride-free hydrothermal synthesis of highly active anatase TiO₂ nanocrystals with a high percentage of (001) facets. These (001)-faceted TiO₂ catalysts exhibit remarkable activity in the visible-light-induced oxidation of various amines, including aliphatic, primary, secondary amines, and N-heterocycles, as well as in amine cross-coupling reactions under ambient air conditions. The high reactivity is attributed to the formation of a surface complex between the amine and the TiO₂ (001) facet, which acts as a visible-light sensitizer, modifying the band structure of TiO₂ and facilitating efficient charge separation and subsequent oxidation processes. Notably, these reactions proceed effectively under visible light irradiation despite the inherent UV-light absorption of TiO₂. The catalyst demonstrates excellent recyclability with minimal activity loss over six cycles and can be utilized for the gram-scale synthesis of imines, making it a promising and sustainable approach for amine oxidation reactions.

Graphical Abstract

查看原文本刊更多论文

富（001）Facet TiO2纳米晶体催化的胺和n -杂环的可见光驱动好氧氧化

本文报道了一种简单、无氟的水热合成高活性锐钛矿型二氧化钛纳米晶体，该晶体具有高比例的（001）切面。这些（001）面TiO2催化剂在可见光诱导的各种胺（包括脂肪族、伯胺、仲胺和n -杂环）氧化以及在环境空气条件下的胺交叉偶联反应中表现出显著的活性。高反应活性是由于在胺和TiO2（001）面之间形成了一个表面配合物，该配合物作为可见光敏化剂，改变了TiO2的能带结构，促进了有效的电荷分离和随后的氧化过程。值得注意的是，这些反应在可见光照射下有效进行，尽管TiO2固有的紫外线吸收。该催化剂具有良好的可回收性，在六个循环中具有最小的活性损失，可用于克级合成亚胺，使其成为胺氧化反应的一种有前途的可持续方法。图形抽象

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.