Apport du bistouri piézo-électrique en chirurgie osseuse pré-implantaire (évaluation à partir de trois cas clinique)

NICE-Antenne de St Jean d'Angely (060882105) / SudocNICE-BU Médecine Odontologie (060882102) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF

Thermal and concentration dependent energy transfer of Eu²⁺ in SrAl₂O₄

SrAl2O4 doped with europium and dysprosium is a powerful and widely used afterglow material. Within this material strontium is found in two crystallographic different sites. Due to the similar ion radii and same charge, Eu2+-ions can occupy both sites, resulting in two different Eu2+-ions, one emitting in the blue and one in the green spectral range. The blue emission is thermally quenched at room temperature. In this paper we investigate the energy transfer between different Eu ions depending on the concentration and temperature using two different approaches: lifetime measurements and integrated intensity. We find an activation energy for the thermal quenching of the blue emission of 0.195 ± 0.023 eV and a critical radius for the energy transfer of 3.0 ± 0.5 nm. This results can help in designing better afterglow materials due to the fact that with energy transfer parts of the lost emission in the blue region at room temperature can be converted to the green site

Vanadium complexes incorporating the beta-diketiminato ligand L. Syntheses and structures of LV(OSO2CF3)(2) and LVPPh2

The reaction of LLi (where L = N, N'-bis(2-diethylaminoethyl)-2,4-pentanediimine- ate(-1)) with VCl3.3THF yielded LVCl2, which was characterized by EI-MS and elemental analysis. Subsequent reactions of LVCl2 with AgOSO2CF3 and KPPh2 afforded two new complexes, LV(OSO2CF3)(2) and LVPPh2 which were characterized by F-19, P-31 NMR spectroscopy, EI-MS, elemental analysis, and single crystal X-ray structural analysis

Synthesis and reaction chemistry of 4-nitrile-substituted NCN-pincer palladium(II) and platinum(II) complexes (NCN = [NC-4-C6H2(CH2NMe2)2-2,6]−)

Nitrile-functionalized NCN-pincer complexes of type [MBr(NC-4-C6H2(CH2NMe2)2-2,6)] (6a, M = Pd; 6b, M = Pt) (NCN = [C6H2(CH2NMe2)2-2,6]−) are accessible by the reaction of Br-1-NC-4-C6H2(CH2NMe2)2-2,6 (2b) with [Pd2(dba)3 · CHCl3] (5a) (dba = dibenzylidene acetone) and [Pt(tol-4)2(SEt2)]2 (5b) (tol = tolyl), respectively. Complex 6b could successfully be converted to the linear coordination polymer {[Pt(NC-4-C6H2(CH2NMe2)2-2,6)](ClO4)}n (8) upon its reaction with the organometallic heterobimetallic π-tweezer compound {[Ti](μ-σ,π-CCSiMe3)2}AgOClO3 (7) ([Ti] = (η5-C5H4SiMe3)2Ti). The structures of 6a (M = Pd) and 6b (M = Pt) in the solid state are reported. In both complexes the d8-configurated transition metal ions palladium(II) and platinum(II) possess a somewhat distorted square-planar coordination sphere. Coordination number 4 at the group-10 metal atoms M is reached by the coordination of two ortho-substituents Me2NCH2, the NCN ipso-carbon atom and the bromide ligand. The NC group is para-positioned with respect to M

Phosphane- and phosphite-silver(I) phenolates: Synthesis, characterization and their use as CVD precursors

Jakob A, Schmidt H, Walfort B, et al. Phosphane- and phosphite-silver(I) phenolates: Synthesis, characterization and their use as CVD precursors. INORGANICA CHIMICA ACTA. 2011;365(1):1-9

Oxime-substituted NCN-pincer palladium and platinum halide polymers through non-covalent hydrogen bonding (NCN = [C6H2(CH2NMe2)2-2,6]−)

The oxime-substituted NCN-pincer molecules HONCH-1-C6H3(CH2NMe2)2-3,5 (2a) and HONCH-4-C6H2(CH2NMe2)2-2,6-Br-1 (2b) were accessible by treatment of the benzaldehydes H(O)C-4-C6H3(CH2NMe2)2-3,5 (1a) and H(O)C-4-C6H2(CH2NMe2)2-2,6-Br-1 (1b) with an excess of hydroxylamine. In the solid state both compounds are forming polymers with intermolecular O–HN connectivities between the Me2NCH2 substituents and the oxime entity of further molecules of 2a and 2b, respectively. Characteristic for 2a and 2b is a helically arrangement involving a crystallographic 21 screw axis of the HONCH-1-C6H3(CH2NMe2)2-3,5 and HONCH-4-C6H2(CH2NMe2)2-2,6-Br-1 building blocks. The reaction of 2b with equimolar amounts of [Pd2(dba)3 · CHCl3] (3) (dba = dibenzylidene acetone) or [Pt(tol)2(SEt2)]2 (4) (tol = 4-tolyl) gave by an oxidative addition of the C–Br unit to M coordination polymers with a [(HONCH-4-C6H2(CH2NMe2)2-2,6)MBr] repeating unit (5: M = Pd, 6: M = Pt). Complexes 5 and 6 are in the solid state linear hydrogen-bridged polymers with O–HBr contacts between the oxime entities and the metal-bonded bromide