Designing stable molecules with efficient near-infrared (NIR) photothermal/photoacoustic performances is important for biological and environmental applications. In this article, we inserted paramagnetic Cu(II) into tetraanthraporphyrin to generate a highly photostable molecule, CuANP, which demonstrated a sharp, intense Q band in the NIR region above 800 nm. Unlike its diamagnetic Zn(II)-coordinated analog ZnANP that degraded rapidly under ambient light, CuANP has a low-lying singly unoccupied d orbital that quenched radioactive emission and reactive oxygen generation effectively, resulting in fast photothermal response, excellent photothermal conversion capacity and heat endurance under long-term laser irradiation in an organic solvent, in water after encapsulation as a nanocomposite, and in the solid state CuANP also exhibited an intense NIR photoacoustic response and was reversibly redox-active, displaying a broad band spreading to the NIR-II window (700–1,300 nm) in the dicationic state. This paramagnetic metal incorporation strategy can enhance the performance of photolabile NIR absorbing molecules for a variety of photothermal/photoacoustic applications.
设计具有高效近红外(NIR)光热/光声性能的稳定分子对于
生物和环境应用非常重要。在这篇文章中,我们将顺磁性的 Cu(II) 加入四
卟啉中,生成了一种高度光稳定性的分子 CuANP,它在 800 纳米以上的近红外区域显示出尖锐、强烈的 Q 带。与在环境光下迅速降解的二磁性 Zn(II)配位类似物 ZnANP 不同,CuANP 具有低洼的单个未占据 d 轨道,可有效淬灭放射性发射和活性氧生成,从而实现快速光热响应、在有机溶剂中长期激光照射下,CuANP 具有优异的光热转换能力和耐热性;在封装成纳米复合材料后的
水中,CuANP 具有优异的光热转换能力和耐热性;在固态下,CuANP 还表现出强烈的近红外光声响应和可逆的氧化还原活性,在二阳离子状态下,CuANP 的宽带扩展到近红外-II 窗口(700-1300 纳米)。这种顺磁
金属掺杂策略可以提高可光吸收近红外分子的性能,从而实现各种光热/光声应用。