Photothermal therapy in the second near-infrared window (NIR-II, 1000–1700 nm) exhibits a significant advantage over the first near-infrared window (NIR-I, 650–950 nm) in terms of both maximum permissible exposure (MPE) and penetration depth. However, the thus far reported NIR-II photothermal agents (PTAs) have been focused just on inorganic semiconducting and organic polymeric semiconducting nanoparticles. Herein a novel cruciform phthalocyanine pentad was designed, synthesized, and characterized for the first time. The water-soluble nanoparticles (Zn4–H2Pc/DP NPs) assembled from this single molecular material with the help of DSPE–PEG2000–OCH3 exhibit characteristic absorption in the NIR-II region at 1064 nm with a large extinction coefficient of 52 L g–1 cm–1, high photothermal conversion efficiency of 58.3%, and intense photoacoustic signal. Moreover, both in vitro and in vivo studies reveal the good biocompatibility and notable tumor ablation ability of Zn4–H2Pc/DP NPs under 1064 nm laser irradiation. Theoretical density functional theory calculations interpret the two-dimensional compressional wave energy-dissipation pathway over the broad saddle curved framework of the cruciform conjugated phthalocyanine pentad, rationalizing the efficient photothermal properties of corresponding Zn4–H2Pc/DP NPs in the NIR-II window.
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机译:就最大允许暴露量(MPE)而言,第二近红外窗口(NIR-II,1000-1700 nm)中的光热疗法比第一近红外窗口(NIR-I,650-950 nm)具有显着优势。和穿透深度。然而,迄今为止报道的NIR-II光热剂(PTA)仅集中在无机半导体和有机聚合物半导体纳米颗粒上。本文首次设计,合成和表征了新型十字形酞菁五单元组。由单分子材料借助DSPE–PEG2000–OCH3组装而成的水溶性纳米颗粒(Zn4-H2Pc / DP NPs)在NIR-II区的1064 nm处具有特征吸收,消光系数大,为52 L g < sup> –1 sup> cm –1 sup>,58.3%的高光热转换效率和强烈的光声信号。此外,体外和体内研究均显示了在1064 nm激光照射下Zn4-H2Pc / DP NP的良好生物相容性和显着的肿瘤消融能力。理论密度泛函理论计算解释了十字形共轭酞菁五单元组的宽鞍形弯曲骨架上的二维压缩波能量耗散途径,使相应的Zn4-H2Pc / DP NP在NIR-II窗口中的有效光热特性合理化。
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