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Mokhtar Ferid B. Piriou Malika Trabelsi-Ayedi 《Journal of Thermal Analysis and Calorimetry》1998,53(1):227-234
The LiPO3-Pr(PO3)3 system was studied by micro-differential thermal analysis. The only new compound observed in the system was LiPr(PO3)4, melting incongruently at 1246 K. An eutectic appears at 926 K. Crystallographic data and powder diagram of the new compound
are given. LiPr(PO3)4 crystallizes in the C2/c monoclinic system with unit cell:
a=16.428(6), b=7.054(3), c=9.747(4) Å, β=126°31′(3), V=910.2 Å3, Z=4.
The IR and Raman spectra of this compound are given.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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Peinnequin A Piriou A Mathieu J Dabouis V Sebbah C Malabiau R Debouzy JC 《Bioelectrochemistry (Amsterdam, Netherlands)》2000,51(2):157-161
Non-thermal effects of microwaves (MWs) are one of the main issues studied for revising standards. The effects of MW exposure on apoptosis at non-thermal level (48 h, 2.45 GHz, 5 mW/cm2) have been studied. Results obtained assess non-thermal MW effects on Fas, but neither on butyrate- nor on ceramide-induced apoptosis in human Jurkat T-cell line. These data show that MW interacts either with Fas pathway between receptor and caspase-3 activation or on membrane proteins (i.e. Fas receptor or neurosphyngomyelinase). 相似文献
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Dr. Thomas Delouche Dr. Elsa Caytan Dr. Cassandre Quinton Dr. Thierry Roisnel Marie Cordier Dr. Vincent Dorcet Prof. Muriel Hissler Dr. Pierre-Antoine Bouit 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(44):11391-11397
A family of cyclic phosphine-disiloxane featuring peri-substituted naphthyl(Nap)/acenaphthyl(Ace) scaffolds has been prepared and fully characterized including X-ray structure, which enables a detailed structural analysis. This straightforward synthesis takes advantage of both ortho- and peri-substitution of Nap/Ace-substituted phosphine oxides. The synthetic method allows diversifying the polycyclic aromatic platform (Nap and Ace) as well as the Si substituents (Me and Ph). Despite a strong steric congestion, the P-atom remains reactive toward oxidation or coordination. In particular, Au(I) complex could be prepared. All the compounds display absorption/luminescence in the UV-Vis range. Surprisingly, the P-trivalent derivatives display unexpected luminescence in the green in solid-state. 相似文献
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Dr. Stanislav V. Konnov Florent Dubray Dr. Edwin B. Clatworthy Dr. Cassandre Kouvatas Prof. Jean-Pierre Gilson Dr. Jean-Pierre Dath Dr. Delphine Minoux Dr. Cindy Aquino Dr. Valentin Valtchev Dr. Simona Moldovan Dr. Siddardha Koneti Dr. Nikolai Nesterenko Dr. Svetlana Mintova 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(44):19721-19728
The current energy transition presents many technological challenges, such as the development of highly stable catalysts. Herein, we report a novel “top-down” synthesis approach for preparation of a single-site Mo-containing nanosized ZSM-5 zeolite which has atomically dispersed framework-molybdenum homogenously distributed through the zeolite crystals. The introduction of Mo heals most of the native point defects in the zeolite structure resulting in an extremely stable material. The important features of this single-site Mo-containing ZSM-5 zeolite are provided by an in-depth spectroscopic and microscopic analysis. The material demonstrates superior thermal (up to 1000 °C), hydrothermal (steaming), and catalytic (converting methane to hydrogen and higher hydrocarbons) stability, maintaining the atomically disperse Mo, structural integrity of the zeolite, and preventing the formation of silanols. 相似文献
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Fabien Lucas Dr. Lambert Sicard Dr. Olivier Jeannin Dr. Joëlle Rault-Berthelot Dr. Emmanuel Jacques Dr. Cassandre Quinton Dr. Cyril Poriel 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(32):7740-7748
Nanorings, which are macrocycles possessing radially directed π-orbitals have shown fantastic development in the last ten years. Unravelling their unusual electronic properties has been one of the driving forces of this research field. However, and despite promising properties, their incorporation in organic electronic devices remains very scarce. In this work, we aim to contribute to bridge the gap between organic electronics and nanorings by reporting the synthesis, the structural and electronic properties and the incorporation in an organic field-effect transistor (OFET) of a cyclic tetracarbazole, namely [4]cyclo-N-ethyl-2,7-carbazole ( [4]C-Et-Cbz ). The structural, photophysical and electrochemical properties have been compared to those of structurally related analogues [4]cyclo-9,9-diethyl-2,7-fluorene [4]C-diEt-F (with carbon bridges) and [8]-cycloparaphenylene [8]CPP (without any bridge) in order to shed light on the impact of the bridging in nanorings. This work shows that nanorings can be used as an active layer in an OFET and provides a first benchmark in term of OFET characteristics for this type of molecules. 相似文献
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The infrared lattice bands which correspond to the A2 modes of α-quartz, are analyzed by means of the classical oscillator model. The observed dependence of the classical parameters on temperature allows to think that non-linear effects occur by approaching the α→β phase transition. 相似文献
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Pointeau I Piriou B Fedoroff M Barthes MG Marmier N Fromage F 《Journal of colloid and interface science》2001,236(2):252-259
The sorption mechanisms of Eu(3+) on calcium silicate hydrate (CSH) phases of hydrated cement were investigated as a tool for the prediction of the behavior of trivalent radionuclides with aged/degraded cements in radioactive waste repositories. Four techniques were used: site-selective and time-resolved luminescence spectroscopy, XPS, high-resolution SEM coupled with EDX, and XRD. Results showed that europium is not precipitated in the solution despite its low solubility limit. It is strongly retained on CSH, resulting in a more than 99.8% sorption rate. Two main sorption sites were characterized by luminescence spectroscopy. One site, with a long lifetime, can be interpreted as Eu included in the framework of CSH. Another one, with a shorter lifetime, can be interpreted as a site with a hydrated environment that is high but is less than that of europium hydroxide. It corresponds to superficial complexation or precipitation. Copyright 2001 Academic Press. 相似文献