A series of new blue-phosphorescent iridium(III) complexes 1−14 with ligands 2-phenylimidazo[1,2-a]pyridine (pip) derivatives were successfully prepared, and their electrochemical, photophysical, electroluminescent (EL) properties systematically investigated. It was found that the emission maxima are significantly dependent on substituents phenyl ring in range 489−550 nm. For instance, electron-withdrawing groups such as F CF3 shift to shorter wavelengths by lowering HOMO levels (complexes...

Two new bipolar host materials based on a 1,3,5-tris(N-phenylbenzimidazol-2-yl)benzene (TPBI) core with the carbazole and diphenylamine groups were designed, synthesized, applied in phosphorescent organic light-emitting diodes (PhOLEDs). The DFT calculations indicated desirable distribution of HOMO LUMO densities, suggesting potential for charge transport. In addition, electrochemical phosphorescence studies revealed that neither level nor triplet energies differ significantly from parent...

Combinations of electron-withdrawing and -donating substituents on the 8-hydroxyquinoline ligand tris(8-hydroxyquinoline)aluminum (Alq(3)) complexes allow for control HOMO LUMO energies HOMO-LUMO gap responsible emission from complexes. Here, we present a systematic study tuning electroluminescence (EL) Alq(3) green to blue region. In this study, explored combination electron-donating C4 C6. Compounds 1-6 displayed between 478 526 nm, fluorescence quantum yield 0.15 0.57. The compounds 2-6...

We synthesized an ion pair comprising cationic and anionic Ir(III) photosensitizers ([Ir1+][Ir2-]) for photocatalytic CO2 reduction showed that the component imparts stability, while cyclometalating ligands in ensure effective visible-light absorption. The triplet excited state of [Ir1+] is key photoredox species this system mainly generated through transfer excitation energy from moiety due to Coulombic interactions appropriate alignment between two ionic components. positive...

Triarylamine-substituted benzimidazoliums (BI+-PhNAr2), new electron donor-acceptor dyad molecules, were synthesized. Their photocatalytic properties for reductive organic transformations explored using absorption and fluorescence spectroscopy, redox potential determinations, density functional theory calculations, transient reduction reactions of selected substrates. The results show that irradiation BI+-PhNAr2 promotes photoinduced intramolecular transfer to form a long-lived (∼300 μs)...

Recently, a LAP protein, scribble, was identified in Drosophila epithelia as basolateral protein that controls the apical-basolateral polarity. Loss of scribble causes disorganisation and overgrowth epithelia. Scribble has human homologue, (hScrib), which is substrate ubiquitin-mediated degradation by papillomavirus E6 E6AP ubiquitin-protein ligase. In present study, we revealed hScrib localised to regions epithelial cell line MDCK uterine cervical tissues immunofluorescence. Human...

Bis-cyclometalated cationic iridium (Ir) complexes 1–4 comprising two 2-(2-pyridyl)benzo[b]thiophene (btp) ligands and one 2,2′-bipyridyl (bpy) ancillary ligand with different substituents were prepared as new visible light-absorbing sensitizers examined for their photophysical electrochemical properties. Complex 1 was a parent complex without any substituents. Complexes 2–4 contained methyl-, methoxy-, trifluoromethyl groups at 4,4′-positions on the bpy ligand. Systematic investigation of...

A series of bis-cyclometalated cationic iridium (Ir) complexes were synthesized employing two coumarin 6 ligands and a 2,2′-bipyridine (bpy) with various substituents as new sensitizers, realizing both features strong visible-light absorption long-lived excited state. Complexes 2–4, electron-donating methyl methoxy groups, absorbed visible light strongly (ε: 126 000–132 000 M–1 cm–1) exhibited room-temperature phosphorescence remarkably long lifetimes (21–23 μs) in dichloromethane. In...

The current work proposes a novel method for accurate pattern recognition of (mono- and di-) amines determination enantiomeric excess (ee) using molecular self-assembly.

Abstract Cationic iridium(III) complexes comprising two cyclometalating 3‐(2‐benzothiazolyl)‐7‐(diethylamino)coumarin (Coumarin 6) ligands and one diimine ancillary ligand ( N ) were prepared [ = 2,2′‐bipyridyl 2 ), 1,10‐phenanthroline 3 2,2′‐biquinoline 4 )] examined for their photophysical properties. The synergic effect of the intraligand charge‐transfer (ILCT) transition in chromophoric Coumarin 6 moiety metal‐ligand‐to‐ligand CT (MLLCT) and/or ligand‐to‐ligand (LLCT) transitions...

Benzimidazolium naphthoxide (−ONap-BI+) was first synthesized and utilized as an unprecedented betaine photoredox catalyst. Photoexcited state of –ONap-BI+ generated by visible light irradiation catalyzes the reductive deiodination well desulfonylation reactions in which 1,3-dimethyl-2-phenylbenzimidazoline (Ph-BIH) cooperates with electron hydrogen atom donor. Significant solvent effects on reaction progress were discovered, specific solvation toward imidazolium moieties proposed.

We believe that "the simpler we are, the more complete become" is a key concept of chemical sensing systems. In this work, "turn-on" fluorescence chemosensor array relying on only two self-assembled molecular chemosensors with ability both qualitative and quantitative detection phosphorylated saccharides has been developed. The easy-to-prepare was fabricated by in situ mixing off-the-shelf reagents (esculetin, 4-methylesculetin, 3-nitrophenylboronic acid). fluorescence-based saccharide...

An unprecedented photocatalytic system consisting of benzimidazolium aryloxide betaines (BI+-ArO-) and stoichiometric hydride reducing reagents was developed for carrying out desulfonylation reactions N-sulfonyl-indoles, -amides, -amines, α-sulfonyl ketones. Measurements absorption spectra cyclic voltammograms as well density functional theory (DFT) calculations were carried to gain mechanistic information. In the catalytic system, visible-light-activated benzimidazoline aryloxides...

The charge injection properties of poly(3,4-ethylenedioxythiophene):polystyrene sulfonate anodes are crucial for performance organic photovoltaics and light-emitting diodes (OLEDs). A simple method tuning hole efficiency using UV-ozone is shown to change anode work-function optimized carriers balance in the devices improved OLEDs. optimum time treatment differs with device architecture.

Abstract We have developed new blue-phosphorescent iridium complexes based on 2-phenylpyridine derivatives with pertinent substituents and an ancillary ligand to accomplish selective tuning of the HOMO LUMO levels toward high energy gap: A polymer light-emitting device doped blue phosphor was fabricated show emission.

2-(p-Methoxyphenyl)-1,3-dimethylbenzimidazoline (ADMBI) and 2-(o-hydroxyphenyl)-1,3-dimethylbenzimidazoline (HPDMBI) are used as reducing reagents in 1,8-dimethoxypyrene (1,8-DMP) sensitized, photoinduced electron transfer (PET) reactions.This system was effectively for PET induced, reductive transformations of various organic substrates, including α,β-epoxy ketones, the olefin tethered 2-bromomethyl-1-tetralone, o-allyloxy-iodobenzene, well deprotection reactions dodecyl-2-benzoylbenzoate...

Dye-sensitized H2 evolution photocatalysts have attracted considerable attention as promising systems for the photochemical generation of from water. In this study, to mimic reaction field natural photosynthesis artificially, we synthesized a hydrophobic Ru(II) dye-sensitized Pt-TiO2 nanoparticle photocatalyst, RuC9@Pt-TiO2 (RuC9 = [Ru(dC9bpy)2(H4dmpbpy)]2+; dC9bpy 4,4′-dinonyl-2,2′-bipyridine, H4dmpbpy 4,4′-dimethyl phosphonic acid-2,2′-bipyridine), and integrated it into...

The treatment of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) films by ultraviolet (UV) light-ozone to improve device efficiency was investigated utilizing two simple phosphorescent organic light-emitting diodes (PHOLEDs) architectures. maximum external quantum in the first increased from 3.5% for untreated anode 10.5%, while second comprising an exciton blocking layer 15.8% 18.5%. time dependence UV-ozone on performance studied. dramatic improvement PHOLED is...

Abstract A series of monomeric Ru II complexes [Ru(bda)(pyR) 2 ] (H bda = 2,2′‐bipyridine‐6,6′‐dicarboxylic acid, pyR pyridine with a substituent R at the 4‐position) were prepared, and effects groups on ligands catalytic activities toward water oxidation, as well photophysical electrochemical properties, examined. An increase in electron‐withdrawing ability results redshift absorption maximum assigned to transition from d orbital π* orbitals ligands, an oxidation potential complex. These...