Self-assembled nanoparticles based on cationic mono-/AIE tetra-nuclear Ir(iii) complexes: long wavelength absorption/near-infrared emission photosensitizers for photodynamic therapy

Abstract

Cyclometalated Ir(III) complexes as photosensitizers (PSs) have attracted widespread attention because of their good photostability and efficient 1O2 production ability. However, their strong absorption in the UV-vis region severely limits...

Near-infrared metal agents assisting precision medicine: from strategic design to bioimaging and therapeutic applications

“…80 As a result, by changing the metal ion or ligand, the wavelength of MMCs is red-shifted to the NIR region, affecting the numerous electronic transitions. The strategy of extending the wavelength of MMCs primarily entails extending p-systems, inserting polarizable heteroatoms (S, O), 81 introducing electron-withdrawing substituents, 82 introducing long absorption/emission ligands, 83,84 metal-metal bond formation 85,86 and introducing rare earth metal ions, etc. [87][88][89] After that, we will go over how these strategies were applied to a variety of MMCs with different skeletons, as well as the associated photophysical and photochemical properties.…”

“…242 The triple excited states of these metallacycles exhibited two distinct characteristics, namely, ligand/metal-ligand charge transfer and acetylated ligand center features, which were dependent on the conjugate Fig. 17 The chemical structures, maximum TPA wavelengths and TPA cross-section of two-photon excited MOCs (82)(83)(84)(85)(86).…”

Aggregation-induced emission of cyclometalated rhodium(iii) and iridium(iii) phenylpyridine complexes with ancillary 1,3-diketones

“…35,36 Moreover, there has been a renewed interest in studying rhodium(III) cyclometalates together with their iridium(III) analogues. [37][38][39] Since the first report on cyclometalated iridium(III) complexes exhibiting aggregation-induced emission (AIE), 40 numerous Ir(III) complexes have been shown to be AIE-active, and a wide range of potential applications has been proposed for such complexes [41][42][43][44][45][46][47][48][49][50] and other materials. [51][52][53][54][55][56] Surprisingly, there have been no reports on Rh(III) compounds displaying enhanced emission in the solid state or aggregates.…”

Aggregation-Induced Near-Infrared Emission and Electrochemiluminescence of an Iridium(III) Complex for Ampicillin Sodium Sensing

“…In all, most studies on AIE metal iridium­(III) complexes are based on bidentate ligands such as ĈN and N̂N, and substituents such as long chains or hydroxyl and amino that are easy to form hydrogen bonds , in the ligands. Recently, iridium­(III) complexes with AIE properties have been applied in fingerprint visualization, , biological imaging, , organic diodes, , chemical sensors, , and other fields. − …”