Here, we report a ZnIn₂S₄-based photocatalyst that features dual active sites consisting of interfacial Bi–S₃ bonds and sulfur-vacancies in ZnIn₂S₄ nanosheets (denoted as Bi–S₃/S-V_s), which catalyze cascading oxidation and reduction to achieve alcohol-based N-alkylation of amines. Remarkably, the Bi–S₃/S-V_s photocatalyst provides an excellent yield (94.5%) of N-benzylaniline in the model alkylation reaction of aniline and benzyl alcohol, which is greater than that of comparative samples. Charge carrier dynamics and theoretical evidence reveal that the enhanced photocatalytic performance of the Bi–S₃/S-V_s photocatalyst originates from the unique coordination structure and electronic properties of Bi–S₃ and sulfur vacancy (V_s) dual sites, which can act as the reduction and oxidation sites, respectively, to accomplish the cascade reaction for N-alkylation of amines by alcohols in one photocatalytic system. This study provides a new insight into designing high-efficiency photocatalysts with atomic precision.

中文翻译：

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Bi-S3 和硫空位双位点工程用于胺的高效光催化 N-烷基化

在这里，我们报道了一种基于 ZnIn ₂ S _{4的光催化剂，它具有由界面 Bi-S 3}键和 ZnIn ₂ S ₄纳米片中的硫空位组成的双活性位点（表示为 Bi-S ₃ /SV _s），它催化级联反应。氧化和还原以实现胺的基于醇的N-烷基化。值得注意的是，Bi-S ₃ /SV _s光催化剂提供了优异的N收率 (94.5%)-苯胺与苯甲醇的烷基化反应模型中的苯甲基苯胺，大于对比样品。电荷载流子动力学和理论证据表明，Bi-S ₃ /SV _s光催化剂的光催化性能增强源于 Bi-S ₃和硫空位 (V _s ) 双位点独特的配位结构和电子性质，可以作为还原位点和氧化位点，分别在一个光催化系统中完成醇对胺的N-烷基化的级联反应。这项研究为设计具有原子精度的高效光催化剂提供了新的见解。