Realizing precise temperature regulation under low constant near-infrared(NIR)laser density is of great significance for the clinical application of photothermal therapy.However,photo-modulated photothermal conversion...Realizing precise temperature regulation under low constant near-infrared(NIR)laser density is of great significance for the clinical application of photothermal therapy.However,photo-modulated photothermal conversion materials are still in their infancy,and it is challenging and vital to develop photochromic materials with extraordinary radical stability to realize tunable photothermal conversion under an acceptable NIR laser density.In this work,we present a UV-induced photochromic inorganic-organic complex(NEU20)bearing dense packing mode of 4,4′-bipyridine(bpy)/deprotonated 4,4′-bipyridine(H_(2)bpy^(2+))dications and the unique sandwichπ-aggregates consisting of infinite H_(2)bpy^(2+)-bpy-H_(2)bpy^(2+)interaction,which can generate tunable and stable H_(2)bpy^(˙+)radicals through the UV-induced photoinduced electron transfer(PIET)process and cause absorption bands in the red and IR regions,thus modulating the NIR photothermal effect under a low constant NIR laser density.NEU20 enables precise control of photothermal temperatures through UV exposure duration besides changing the NIR laser power,and its photothermal conversion exhibits good recyclability,a high conversion efficiency and high temperature increase rate.The clear and adjusted imaging performance based on the photothermal effect is also presented.展开更多
基金financially supported by the China Postdoctoral Science Foundation(No.2021MD703898)the Natural Science Foundation of Liaoning Province(No.2022-MS-117)the Jilin Scientific and Technological Development Program(20210402053GH and 20230101026JC).
文摘Realizing precise temperature regulation under low constant near-infrared(NIR)laser density is of great significance for the clinical application of photothermal therapy.However,photo-modulated photothermal conversion materials are still in their infancy,and it is challenging and vital to develop photochromic materials with extraordinary radical stability to realize tunable photothermal conversion under an acceptable NIR laser density.In this work,we present a UV-induced photochromic inorganic-organic complex(NEU20)bearing dense packing mode of 4,4′-bipyridine(bpy)/deprotonated 4,4′-bipyridine(H_(2)bpy^(2+))dications and the unique sandwichπ-aggregates consisting of infinite H_(2)bpy^(2+)-bpy-H_(2)bpy^(2+)interaction,which can generate tunable and stable H_(2)bpy^(˙+)radicals through the UV-induced photoinduced electron transfer(PIET)process and cause absorption bands in the red and IR regions,thus modulating the NIR photothermal effect under a low constant NIR laser density.NEU20 enables precise control of photothermal temperatures through UV exposure duration besides changing the NIR laser power,and its photothermal conversion exhibits good recyclability,a high conversion efficiency and high temperature increase rate.The clear and adjusted imaging performance based on the photothermal effect is also presented.
