Recently, layered two-dimensional (2D) semiconductor materials composed of group 15 elements (pnictogens) are demonstrated as efficient photocatalysts in various applications. However, only little attention is given to the investigation of their catalytic properties, and even there is no example of the photocatalytic application of bismuthene so far. Here we report for the first time on the use of 2D bismuthene as a photocatalyst in a liquid-phase organic transformation. 2D bismuthene is proven to be an efficient photocatalyst that can be operated under various reaction conditions including indoor light illumination, darkness, outdoors and low temperature for the photoredox C–H arylation of (hetero)arenes with high product yields. The presented bismuthene catalyzed photoredox C–H arylation protocol works efficiently on a broad substrate scope of (hetero)arenes with aryl diazonium salts bearing electron-withdrawing and electron-donating groups. Moreover, a density functional theory (DFT) study reveals mechanistic details that lie behind the catalytic activity of bismuthene.

最近，由 15 族元素（pnictogens）组成的层状二维 (2D) 半导体材料在各种应用中被证明是有效的光催化剂。然而，对其催化性能的研究却很少受到关注，甚至目前还没有铋光催化应用的例子。在这里，我们首次报道了在液相有机转化中使用二维铋作为光催化剂。二维铋被证明是一种高效的光催化剂，可以在各种反应条件下操作，包括室内光照、黑暗、室外和低温，用于（杂）芳烃的光氧化还原 C-H 芳基化，具有高产率。所提出的铋催化光氧化还原 C-H 芳基化方案在广泛的（杂）芳烃底物范围内有效地工作，其中芳基重氮盐带有吸电子和给电子基团。此外，密度泛函理论 (DFT) 研究揭示了铋催化活性背后的机制细节。