制备了通过共振能量转移(RET)作用增强的有机三线态光敏剂(R-1和R-2)。罗丹明用作分子内能量供体,碘代-苯乙烯基-Bodipy用作分子内能量受体/自旋转换器。R-1和R-2中的能量供体和能量受体在可见光区域均具有强吸收性,但在不同的波长下(例如,对于R-1,在557 nm处ε = 120 000 M -1 cm -1,对于能量供体并且ε = 73300 M -1 cm -1对于能量受体在639 nm处)。结果,光敏剂在可见光谱区域显示宽带吸收。相比之下,传统的三重态光敏剂仅包含一种可见光收集生色团;因此,在可见光谱区域通常只有一个主要吸收带。使用稳态和时间分辨光谱,我们证明了在能量供体中的光激发之后是分子内单线态能量转移,然后通过能量受体(自旋转换器)的系统间交叉(ISC),产生了位于碘-苯乙烯基-Bodipy上的三重态激发态,这通过纳秒时间分辨的瞬态差吸收光谱法得到了证实。将有机二
Structure-inherent targeting (SIT) agents are of particular importance for clinical precision medicine; however, there still exists a great lack of SIT phototheranostics for simultaneous cancer diagnosis and targeted photodynamic therapy (PDT). Herein, for the first time, we propose a "one-for-all" strategy by using the Forster resonance energy transfer (FRET) mechanism to construct such omnipotent SIT phototheranostics. Of note, this novel tactic can not only endow conventional sensitizers with highly effective native tumor-targeting potency but also simultaneously improve their photosensitization activities, resulting in dramatically boosted therapeutic index. After intravenous injection of the prepared SIT theranostic, the neoplastic sites are distinctly "lighted up" and distinguished from neighboring tissues, showing a near-infrared signal-to-background ratio value as high as 12.5. More importantly, benefiting from the FRET effect, markedly amplified light harvesting ability and 102 production are demonstrated. Better still, other favorable features are also simultaneously achieved, including specific mitochondria anchoring, augmented cellular uptake (>13-fold), as well as ideal biocompatibility, all of which allow orders-of-magnitude promotion in anticancer efficiency both in vitro and in vivo. We believe this one-for-all SIT platform will provide a new idea for future cancer precision therapy.