Exploration of the Structural and Photophysical Characteristics of Mono- and Binuclear Ir(III) Cyclometalated Complexes for Optoelectronic Applications

Abstract

Intrinsic characteristics possessed and exhibited by Ir(III) cyclometalated complexes need to be further examined, understood, and explored for greater value enhancement and potentiation. This work focuses primarily on the comparative studies of the ligand structures, types, and their substituent influence on the photophysical and optoelectronic properties of typical cyclometalated mono- and binuclear iridium(III) complexes in solution or solid states.

Dinuclearization strategy of cationic iridium(iii) complexes for efficient and stable flexible light-emitting electrochemical cells

“…[40][41][42][43][44] In addition, dinuclear species can present specific photophysical properties and functions by tuning the bridging ligands, which provide more design opportunities to control the solid-packing and intrinsic excited-state characteristics. [45][46][47][48] It is noted that the bridging ligand in dinuclear iridium(III) complexes can also act as the bulky substituent group that presumably minimizes the accessibility of the metal center to the foreign species, preventing the undesired degradation of iridium(III) complexes caused by the rupture of the metal-coordinated nitrogen atom. [49][50][51] Meanwhile, dinuclear iridium(III) complexes will hold more effective intersystem crossing processes due to the presence of a second metal-centered iridium(III) atom (see Fig.…”

Highly Active Single-Atom Nanozymes with High-Loading Iridium for Sensitive Detection of Pesticides

“…Ir(III) complexes with the chemical structure Ir(III)(C ̂N) 2 (O ̂O) have been widely reported in photoluminescence and electroluminescence fields, where the O ̂O ligands are usually acted by diketonate-related compounds, such as acetylacetonate (acac) complexes. 20,21 dicarbonyl structures as O ̂O ligands to coordinate with Ir(III) complexes and hence graft atomical Ir on its surface. 22,23 Notably, unlike the most reported carbon-based enzyme-like materials, they are usually doped with nitrogen (N), phosphor (P), or other elements to increase their enzyme-like activity.…”

“…In this work, a highly active iridium (Ir)-containing SAzyme was prepared through anchoring an Ir­(III) complex with ĈN ligands on the surface of a graphene oxide (GO) nanosheet, which is named as Ir­(III)/GO. Ir­(III) complexes with the chemical structure Ir­(III)­(ĈN) 2 (ÔO) have been widely reported in photoluminescence and electroluminescence fields, where the ÔO ligands are usually acted by diketonate-related compounds, such as acetylacetonate (acac) complexes. , GO possesses highly abundant O-containing groups, such as −O–, −(CO)–, −OH, and −COOH, which can also offer gem-dicarbonyl structures as ÔO ligands to coordinate with Ir­(III) complexes and hence graft atomical Ir on its surface. , Notably, unlike the most reported carbon-based enzyme-like materials, they are usually doped with nitrogen (N), phosphor (P), or other elements to increase their enzyme-like activity . In this GO-supported SAzyme, there is no need to implement the N-doping procedure since the Ir­(III) complex itself carries N-containing ligands.…”

Rational design of efficient photosensitizers based on cyclometalated iridium(iii) complexes with 2-arylbenzimidazole and aromatic 1,3-diketone ligands

“…Cyclometalated iridium(III) complexes have gained enormous attention mainly due to their outstanding photophysical properties, 1,2 which, along with increased robustness and chemical accessibility of the complexes, predetermine their application as photocatalysts, [3][4][5] emitters in organic light-emitting diodes [6][7][8][9] and photosensitizers in dye-sensitized solar cells (DSSCs). [10][11][12] Numerous organic ligands, which can be combined around the iridium ion, pave the way to highly coveted compounds possessing effective sky-blue 13,14 or nearinfrared [15][16][17] emission.…”