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Your search keyword '"Orselli, Enrico"' showing total 5 results
Start Over Author "Orselli, Enrico" Publisher american chemical society
5 results on '"Orselli, Enrico"'

1. Iridium(III) emitters based on 1,4-disubstituted-1H-1,2,3-triazoles as cyclometalating ligand: synthesis, characterization, and electroluminescent devices

Author

Fernández-Hernández, Jesús M., Beltrán Fínez, Juan Ignacio, Lemaur, Vicent, Gálvez-López, María-Dolores, Chien, Chen-Han, Polo, Federico, Orselli, Enrico, Fröhlich, Roland, Cornil, Jérôme, De Cola, Luisa, Fernández-Hernández, Jesús M., Beltrán Fínez, Juan Ignacio, Lemaur, Vicent, Gálvez-López, María-Dolores, Chien, Chen-Han, Polo, Federico, Orselli, Enrico, Fröhlich, Roland, Cornil, Jérôme, and De Cola, Luisa

Abstract

Esta depositada la versión del artículo enviada a la revista, A series of blue and blue-green emitters based on neutral bis- and tris-cyclometalated Ir(III) complexes with 1-benzyl-4-(2,6-difluorophenyl)-1H-1,2,3-triazole (dfptrBn) as cyclometalating ligand is reported. The bis-cyclometalated complexes of the type [Ir(dfptrBn)(2)((LX)-X-boolean AND)] with different ancillary ligands, (LX)-X-boolean AND = picolinate (pic) (2) or 2-(5-(perfluorophenyl)-2H-1,2,4-triazol-3-yl)pyridine (pytrF(5)) (3), are described and their photophysical properties compared with the analogous complexes containing the archetypal 2-(2,4-difluorophenyl)-pyridinato (dfppy) as cyclometaled ligand ((CN)-N-boolean AND). Complex 2 exhibits a marked solvatochromic behavior, from 475 nm in toluene to 534 nm in formamide, due to the strong MLCT character of its emissive excited state. Complex 3 displays a true-blue emission, narrower in the visible part than FIrpic. In addition, the homoleptic complex [Ir(dfprBn)(3)] (4) and the heteroleptic compounds with mixed arylpyridine/aryltriazole ligands, [Ir(dfptrBn)(2)((CN)-N-boolean AND)] ((CN)-N-boolean AND = 2-phenylpyridinato (ppy) (5) or dfppy (6)), have been synthesized and fully characterized. The facial (fac) complex fac-4 is emissive at 77 K showing a deep-blue emission, but it is not luminescent in solution at room temperature similarly to their phenylpyrazole counterparts. However, the fac isomers, fac-5 and fac-6, are highly emissive in solution and thin films, reaching emission quantum yields of 76%, with emission colors in the blue to blue-green region. The photophysical properties for all complexes have been rationalized by means of quantum-chemical calculations. In addition, we constructed electroluminescent devices, organic light-emitting diodes (OLEDs) by sublimation of fac-6, and by solution processed polymer-based devices (PLEDs) using complexes fac-5 or fac-6 as dopants., Fundacion Seneca, Instituto de Salud Carlos III, Ministry of Science and Technology, Taiwan, Deutscher Akademischer Austausch Dienst (DAAD), Fonds de la Recherche Scientifique - FNRS, Ministerio de Ciencia e Innovación (España), Depto. de Física de Materiales, Fac. de Ciencias Físicas, TRUE, pub

Published
2024

2. Blue-emitting iridium complexes with substituted 1,2,4-triazole ligands: synthesis, photophysics, and devices

Author

Orselli, Enrico, Kottas, Gregg S., Konradsson, Asgeir E., Coppo, Paolo, Frohlich, Roland, De Cola, Luisa, van Dijken, Adday, Buchel, Michael, and Borner, Herbert

Subjects
Triazoles -- Research, Triazoles -- Chemical properties, Ligands -- Research, Ligands -- Chemical properties, Iridium -- Research, Iridium -- Chemical properties, Coordination compounds -- Research, Coordination compounds -- Chemical properties, Chemistry
Abstract

The synthesis and characterization of neutral heteroleptic molecular iridium(III) complexes with (2,4-difluoro)phenylpyridine and different pyridine-1,2,4-triazole ligands are described. The studies have shown high external quantum efficiencies and color points better than the standard for blue iridium(III) bis[(4,6-difluorophenyl)pyridinato-N,[C.sup.2]]picolinate.

Published
2007

3. Polypyridyl ruthenium(II) complexes with tetrazolate-based chelating ligands: synthesis, reactivity and electrochemical and photophysical pfroperties

Author

Stagni, Stefano, Orselli, Enrico, Palazzi, Antonio, Cola, Luisa De, Zacchini, Stefano, Femoni, Cristina, Marcaccio, Massimo, Paolucci, Francesco, and Zanarini, Simone

Subjects
Coordination compounds -- Chemical properties, Nuclear magnetic resonance spectroscopy -- Technology application, Pyridazine -- Chemical properties, Pyridazine -- Electric properties, Ruthenium -- Chemical properties, Technology application, Chemistry
Abstract

The studies of pyridyl-tetrazolate or pyrazinyl-tetrazolates as anionic bpy-type ligands for Ru(II) polypyridyl complexes where (pby = 2,2'-bipyridyl) is reported.

Published
2007

5. Blue-Emitting Iridium Complexes with Substituted 1 ,2,4-Triazole Ligands: Synthesis, Photophysics, and Devices.

Author

Orselli, Enrico, Kottas, Gregg S., Konradsson, Asgeir E., Coppo, Paolo, Frbhlich, Roland, De Cola, Luisa, van Dijken, Addy, Buchel, Michael, and Bbrner, Herbert

Subjects
*IRIDIUM, *INORGANIC synthesis, *COMPLEX compounds, *LIGANDS (Chemistry), *ELECTROCHEMISTRY
Abstract

Neutral heteroleptic mononuclear iridium(l II) complexes with (2,4-difluoro)phenylpyridine and different pyridine-1,2,4-triazole ligands were synthesized and fully characterized. We investigated the effects of substituents in the 5-position of the triazole ring on the photophysical and electrochemical behavior. Increasing the electron-withdrawing capabilities generally leads to a lowering of the HOMO level with a consequent slight widening of the HOMO-LUMO gap and a blue shift in emission. The complexes reported exhibit high emission quantum yields and long luminescent lifetimes, typical of iridium(lll) complexes, and most of them show reversible redox processes in solution. Also, many of the complexes reported here have been obtained as single crystals suitable for X-ray crystallography. Two of the complexes were further tested as phosphorescent dyes in OLED devices and showed high external quantum efficiencies (~7%) and color points better than the "standard" for blue iridium(lll) bis[(4,6-difluorophenyl)-pyridinato-N,C²′]picolinate (Flrpic). We also report the full electrochemical investigation of Flrpic in different solvents. [ABSTRACT FROM AUTHOR]

Published
2007
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