Photophysical and Electrochemical Properties of Heteroleptic Tris-Cyclometalated Iridium(III) Complexes

Abstract

Mixed (difluoro)phenylpyridine/(difluoro)phenylpyrazole tris-cyclometalated iridium complexes were prepared in order to study the effect of fluorination and the pyridine/pyrazole ratio on the emission and electrochemical properties. Increasing fluorination and replacement of pyridine by pyrazole both leads to a widening of the HOMO-LUMO gap and generally leads to a blue shift in emission.

Ag/Tio2 Nano Thin Films Catalyzed Efficient Synthesis of 6-Amino-4-Aryl-3-Methyl-1,4-Dihydropyrano[2,3-C] Pyrazole-5-Carbonitriles At Green Conditions

“…In addition pyrazoles have been used for treatment of type 2 diabetes, obesity, thrombopiotinmimetics and antiangiogenesis because of their kinase inhibitory effects 20 . Furthermore, some pyrazoles are employed in polymer and supramolecular chemistry, in the food industry, and as UV stabilizers and cosmetic colorings and in some cases it was observed that these compounds also have liquid crystal properties [21][22][23][24][25] . Dihydropyrano [2,3-c]pyrazoles, are one of the most important pyrazole compounds and they have received considerable attention owing to their biological activity and they have been utilize as a template for medicinal chemistry.…”

White and Saturated Blue Phosphorescent OLED based on the Non-Emissive Homoleptic Complex Ir(ppz)3 as single active material

“…Among all phosphorescent emitters under investigation, iridium (III) complexes are without contest among the most widely studied transition metal complexes: as neutral emitters [24] or as soft salts [25][26][27] for the design of OLEDs or as ionic complexes [28][29][30] for the design of Light-Emitting Electrochemical Cells (LECs). As main advantage over the other transition metal complexes, relatively short excited state lifetime enables to e ciently minimize the triplet-triplet (T-T) annihilation [31,32]. So far, metal complexes that are nearly non-emissive at room temperature but revealing a decent emission at 77K have only been scarcely in-vestigated as emitters for OLEDs [33].…”

Green synthesis of novel pyrazole containing Schiff base derivatives as antibacterial agents on the bases of in-vitro and DFT

“…Five member heterocyclic compounds such as pyrazole are important are important nitrogen containing compounds and numerous pyrazole derivatives have been found to possess considerable biological activities [6], such as antimicrobial [7][8][9], antiamoebic [10,11], antinociceptive [12], anticancer [13], antidepressant [14] and anti-inflammatory [15] . On the other hand, pyrazoline derivatives are also widely used in materials science fields such as non-linear optics (NLO) [16], optical limiting [17], electrochemical sensing [18], Langmuir films and photoinitiated polymerization [19]. On the other hand a pyrazole ring linked to five or six member heterocyclic systems with an azomethine group also showed a variety of biological activity such as antibacterial [20], anti-fungal [21], anti-inflammatory [22], antihypertensive [23], anti-HIV [24], antitumor [25], and anticonvulsant activities.…”