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Shavaleev, N.M.,Scopelliti, R.,Gratzel, M.,Nazeeruddin, M.K. Elsevier Sequoia [etc.] 2012 Inorganica chimica acta Vol.388 No.-
Two new cationic iridium(III) complexes with cyclometalating 1-phenylindazole or 2-phenyl-1,2,3-triazole ligands, [(C@<SUP>N</SUP>)<SUB>2</SUB>Ir(4,4'-di-tert-butyl-2,2'-dipyridyl)](PF<SUB>6</SUB>), exhibit yellow or green phosphorescence with quantum yields and excited state lifetimes of up to 45% and 840ns in argon-saturated dichloromethane solution at room temperature.
Charged cyclometalated iridium(III) complexes that have large electrochemical gap
Shavaleev, N.M.,Scopelliti, R.,Baranoff, E.,Gratzel, M.,Nazeeruddin, M.K. Elsevier Sequoia [etc.] 2012 Inorganica chimica acta Vol.383 No.-
Bis-cyclometalated cationic Ir(III) diimine complexes [Ir(C@<SUP>N</SUP>)<SUB>2</SUB>(N@<SUP>N</SUP>)](PF<SUB>6</SUB>) with 1-phenylpyrazoles (C@<SUP>N</SUP>) and 1-(4'-tert-butyl-2'-pyridyl)pyrazole (N@<SUP>N</SUP>) are white solids that have absorption onset below 425nm and electrochemical gap of up to 3.5V.
Biju, Silvanose,Freire, Ricardo O.,Eom, Yu Kyung,Scopelliti, Rosario,Bü,nzli, Jean-Claude G.,Kim, Hwan Kyu American Chemical Society 2014 Inorganic Chemistry Vol.53 No.16
<P>Reaction of Ln<SUP>III</SUP> with a tetrakis(diketone) ligand H<SUB>4</SUB>L [1,1′-(4,4′-(2,2-bis((4-(4,4,4-trifluoro-3-oxobutanoyl) phenoxy)methyl)propane-1,3-diyl)bis(oxy)bis(4,1-phenylene))bis(4,4,4-trifluorobutane-1,3-dione)] gives new podates which, according to mass spectral data and Sparkle/AM1 calculations, can be described as dimers, (NBu<SUB>4</SUB>[LnL])<SUB>2</SUB> (Ln = Eu, Tb, Gd:Eu), in both solid-state and dimethylformamide (DMF) solution. The photophysical properties of the Eu<SUP>III</SUP> podate are compared with those of the mononuclear diketonate (NBu<SUB>4</SUB>[Eu(BTFA)<SUB>4</SUB>], BTFA = benzoyltrifluoroacetonate), the crystal structure of which is also reported. The new Eu<SUP>III</SUP> dimeric complex displays bright red luminescence upon irradiation at the ligand-centered band in the range of 250–400 nm, irrespective of the medium. The emission quantum yields and the luminescence lifetimes of (NBu<SUB>4</SUB>[EuL])<SUB>2</SUB> (solid state: 51% ± 8% and 710 ± 2 μs; DMF: 31% ± 5% and 717 ± 1 μs) at room temperature are comparable to those obtained for NBu<SUB>4</SUB>[Eu(BTFA)<SUB>4</SUB>] (solid state: 60 ± 9% and 730 ± 5 μs; DMF: 30 ± 5% and 636 ± 1 μs). Sparkle/AM1 calculations were utilized for predicting the ground-state geometries of the Eu<SUP>III</SUP> dimer. Theoretical Judd–Ofelt and photoluminescence parameters, including quantum yields, predicted from this model are in good agreement with the experimental values, proving the efficiency of this theoretical approach implemented in the LUMPAC software (<uri xlink:href='http://lumpac.pro.br' xlink:type='simple'>http://lumpac.pro.br</uri>). The kinetic scheme for modeling energy transfer processes show that the main donor state is the ligand triplet state and that energy transfer occurs on both the <SUP>5</SUP>D<SUB>1</SUB> (44.2%) and <SUP>5</SUP>D<SUB>0</SUB> (55.8%) levels. Furthermore, the newly obtained Eu<SUP>III</SUP> complex was doped into a PMMA matrix to form highly luminescent films and one-dimensional nanowires having emission quantum yield as high as 67%–69% (doping concentration = 4% by weight); these materials display bright red luminescence even under sunlight, so that interesting photonic applications can be foreseen.</P><P>A red-emitting dimeric Eu<SUP>III</SUP> podate based on a tetrakis(β-diketonate) ligand emits highly monochromatic red light and features the highest quantum yield reported so far for dinuclear Eu<SUP>III</SUP> bis(β-diketonates); doping into a PMMA matrix results in thin films and one-dimensional nanowires, the luminescence of which can be seen under sunlight illumination.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/inocaj/2014/inocaj.2014.53.issue-16/ic500966z/production/images/medium/ic-2014-00966z_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ic500966z'>ACS Electronic Supporting Info</A></P>
LEPTOGENESIS AND QUINTESSENTIAL KINATION
World Scientific 2008 Modern physics letters A Vol.23 No.17
<P> We show how thermal leptogenesis induced by the CP-violating decay of a right-handed neutrino (RHN) can be compatible to the assumption of quintessential kination, i.e., to a cosmological background model where the energy density of the early Universe is assumed to be dominated by the kinetic term of a quintessence field during some epoch of its evolution. The phenomenology depends on the temperature Tr above which kination dominates over radiation. We show that for some choice of Tr not far from the RHN mass M, M/100 < Tr < M, the efficiency for leptogenesis can be even larger than in the standard scenario of radiation domination. On the other hand, when Tr ≪ M a super-weak wash-out regime is attained, with a strong suppression of the efficiency. In this case successful leptogenesis depends sensitively on ΔL = 1 scattering processes and requires a resonant CP violation effect of order unity. Moreover, the condition Tr > 5 MeV (M/TeV) (0.05 eV/m) must be verified, with m the effective neutrino mass scale. </P>
Soft leptogenesis in Higgs triplet model
Chun, Eung Jin,Scopel, Stefano Elsevier 2006 Physics letters: B Vol.636 No.5
<P><B>Abstract</B></P><P>We consider the minimal supersymmetric triplet seesaw model as the origin of neutrino masses and mixing as well as of the baryon asymmetry of the Universe, which is generated through soft leptogenesis employing a CP-violating phase and a resonant behavior in the supersymmetry breaking sector. We calculate the full gauge-annihilation cross section for the Higgs triplets, including all relevant supersymmetric intermediate and final states, as well as coannihilations with the fermionic superpartners of the triplets. We find that these gauge annihilation processes strongly suppress the resulting lepton asymmetry. As a consequence of this, successful leptogenesis can occur only for a triplet mass at the TeV scale, where the contribution of soft supersymmetry breaking terms enhances the CP and lepton asymmetry. This opens up an interesting opportunity for testing the model in future colliders.</P>