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Messa a punto delle proprietà fotoemissive e ottiche non lineari di sistemi nanoorganizzati
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Second-order nonlinear optical properties of cyclometallated Ir(III) and Pt(II) complexes
No full textThe second-order NLO properties of various cyclometallated cationic Ir(III) and neutral Pt(II) complexes were determined by both Electric Field Induced Second Harmonic generation (EFISH) and Harmonic Light Scattering (HLS) techniques.
Cationic 1,10-phenanthroline and bipyridine iridium(III) complexes (1, 2) are characterized by high negative EFISH β values which decrease when the ion-pair strength between the cation and the counterion (PF6–, C12H25SO3–) increases. Neutral Pt(II) complexes (3, 4) are also characterized by a good to high negative NLO response.
For all these cyclometallated complexes, the EFISH response is mainly controlled by MLCT/L'LCT processes. Interestingly, a combination of HLS and EFISH techniques, used to evaluate both the dipolar and octupolar contributions to the total quadratic hyperpolarizability, shows that the major contribution is controlled by the octupolar part. [...]
1. V. Aubert, L. Ordronneau, M. Escadeillas, J. A. G. Williams, A. Boucekkine, E. Coulaud, C. Dragonetti, S. Righetto, D. Roberto, R. Ugo, A. Valore, A. Singh, J. Zyss, I. Ledoux-Rak, H. Le Bozec, V. Guerchais, Inorg. Chem. 2011. ASA
Second order non linear optical properties of neutral Ir(III) and Pt(II) complexes with substituted b-diketonate ligands.
No full textSimple novel cyclometallated iridium complexes for potential application in dye-sensitized solar cells
No full textDye-sensitized solar cells (DSSCs) are considered a real solution for harnessing the energy of the sun and converting it into electrical energy, exceeding the value of 11% efficiencies with the most performing Ru(II) sensitizers. The photosensitizer dye plays a key role in DSSCs, and iridium complexes are potentially good candidates for application in those kind of cells. Here we report the synthesis and characterization of three new simple cyclometallated Ir(III) complexes of the type: [Ir(C^N)2(4,4′- dicarboxybipyridine)][PF6] (C^N = variously substituted phenylpyridine cyclometallating ligand) and we try to understand if there is an influence of the nature of the cyclometallating ligand on the photovoltaic performance of the related dye-sensitized solar cells. The use of more conjugated π-delocalized cyclometallating ligands, that slightly shifts the UV bands to higher wavelengths, affords little better photovoltaic parameters. In addition we report the emission spectra and the emission quantum yields of all the phosphorescent Ir(III) complexes
Cyclometallated Iridium(III) complexes with substituted 1,10- phenanthrolines for organic light emitting diodes.
No full textExperimental and theorethical studies of push-pull Copper (II) complexes of salen analogues for NLO applications
No full textThe sulphonated nature of the ligand as origin of the "triflate effect" on the NLO properties of [ZnY2L2] (L = 4-trans-NC5H4(CHCH)C6H4NMe2) complexes
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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