Iridium(III) Complexes with Orthometalated Phenylimidazole Ligands Subtle Turning of Emission to the Saturated Green Colour

Abstract

A series of novel six iridium complexes (1-6) bearing two substituted phenylimidazole and an additional acetylacetone as the third co-auxilary ligand are reported. The lowest absorption band for all iridium complexes consist of a mixture of heavy atom Ir(III) enhanced (3)MLCT and (3) π-π* transitions and the phosphorescent peak wavelength can be fine-tuned to cover the spectral range 455-518 nm with high quantum efficiencies. The peak wavelength of the dopants can be finely tuned depending upon the electronic properties of the substituents. On the basis of onset potentials of the oxidation and reduction, the HOMO-LUMO energies were calculated and the reported iridium complexes emit green light with exceeding higher efficiency.

Fluorescence resonance energy transfer from a bio-active imidazole derivative 2-(1-phenyl-1H-imidazo[4,5-f][1,10]phenanthrolin-2-yl)phenol to a bioactive indoloquinolizine system

“…Therefore, imidazole derivatives have been used to construct highly sensitive fluorescent chemisensors for sensing and imaging of metal ions and its chelates in particular those with Ir 3+ are major components for organic light emitting diodes [1] and are promising candidates for fluorescent chemisensors for metal ions. In continuation of our recent research experimental results [6][7][8][9][10][11][12][13][14][15], in the present paper we summarized a comprehensive study of the imidazole derivative and its structure was characterized by NMR spectra. Photophysical, photochemical studies, its chemisensor behaviour and FRET studies were analyzed and discussed.…”

“…The experimental procedure was used as the same as described in our recent papers [6][7][8][9][10][11][12][13][14][15]. The imidazole derivative, PIPP was synthesized from an unusual four components assembling of 1,10-phenanthroline-5,6-dione, ammonium acetate, aniline and salicylaldehyde (Scheme 1).…”

A dodecanethiol-functionalized Ag nanoparticle-modified ITO anode for efficient performance of organic light-emitting devices

“…In general, phosphorescence spectra from a ligand-centered 3 p-p* state are vibronic, whereas PL spectra from a 3 MLCT state display broad shapes. [63][64][65][66] The absence of emission spectra with a vibronic structure for the organometallic complex Ir(mpidmb) 2 (acac) indicates that the emissions occur from a well-equilibrated emissive state and have MLCT character, which is further conrmed by the phosphorescence lifetime of 1.62 ms.…”

Kamlet-Taft and Catalan Studies of Some Novel Y-Shaped Imidazole Derivatives

“…The experimental procedure was used as the same as described in our recent papers [15][16][17][18][19][20][21][22][23][24][25][26]. The imidazole derivatives were synthesized from an unusual four components assembling of benzil, ammonium acetate, aniline and the corresponding aldehydes (Scheme-1).…”