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81.
Neukirch H Guido E Liantonio R Metrangolo P Pilati T Resnati G 《Chemical communications (Cambridge, England)》2005,(12):1534-1536
The halogen bonding driven self-assembly of 1,8-diiodoperfluorooctane and N,N,N',N'-tetramethyl-p-phenylenediamine induces the formation of a chiral and enantiopure co-crystal wherein the fluorinated chains adopt an unusual gauche arrangement. 相似文献
82.
Silvana Modena Pierangelo Calini Guglielmo Gregorio Giovanni Moggi 《Journal of fluorine chemistry》1988,40(2-3):349-357
Liquid phase fluorination of diethyleneglycol dimethyl ether tetraethyleneglycol dimethyl ether, 2[1,2-dichloro-1,2-difluoroethyl] tetrahydrofuran and 2[1,2-dichloro-1,2-difluoroethyl] dioxane 1,4 produce the corresponding perfluoroethers in 56, 43, 67 and 74 % yields respectively.
The by-products are partially fluorinated compounds and no fragmentation is observed.
The simplicity of the reactions and method of preparation make this approach to fluorinated fluids and oils industrially attractive. 相似文献
83.
Dicarboxylic Acid Separation by Dynamic and Size‐Matched Recognition in Solution and in the Solid State
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Dr. Vijith Kumar Dr. Tullio Pilati Prof. Dr. Giancarlo Terraneo Dr. Gianluca Ciancaleoni Prof. Dr. Alceo Macchioni Prof. Dr. Giuseppe Resnati Prof. Dr. Pierangelo Metrangolo 《Angewandte Chemie (International ed. in English)》2018,57(5):1327-1331
Bis(trimethylammonium) alkane diiodides dynamically encapsulate dicarboxylic acids through intermolecular hydrogen bonds between the I? anions of the hosts and the carboxylic OH groups of the guests. A selective recognition is realized when the size of the I????HOOC(CH2/CF2)nCOOH???I? superanion matches the dication alkyl chain length. Dynamic recognition is also demonstrated in solution, where the presence of the size‐matching organic salt boosts the acid solubility profile, thus allowing efficient mixture separation. 相似文献
84.
Mele A Metrangolo P Neukirch H Pilati T Resnati G 《Journal of the American Chemical Society》2005,127(43):14972-14973
A new heteroditopic receptor for alkali metal halides has been designed and synthesized. It is comprised of a well-established motif for cation binding and a motif for halogen-bonding-based anion recognition processes. The single-crystal X-ray structure of the complex between the heteroditopic receptor and sodium iodide is reported. Thanks to the cooperativity of metal coordination and the strong I-...I halogen bonding, the ion pair is fully separated. The boosting effect of the binding of the anion through halogen bonding on the coordination of the cation by the receptor has been proved also in solution by NMR experiments. The selectivity of the new heterotopic receptor toward different alkali metal halides has been tested by ESI mass experiments. 相似文献
85.
Metrangolo P Meyer F Pilati T Proserpio DM Resnati G 《Chemistry (Weinheim an der Bergstrasse, Germany)》2007,13(20):5765-5772
Halogen bonding (XB) has been used to assemble tetrakis(4-pyridyl)pentaerythritol (tetradentate XB acceptor) with different alpha,omega-diiodoperfluoroalkanes (bidentate XB donors) or tetrakis(4-iodotetrafluorophenyl)pentaerythritol (tetradentate XB donor). The remarkable linearity of the XB formed, the rodlike character of alpha,omega-diiodoperfluoroalkanes and the mutual complementarities of pentaerythritol partners, translate the three-dimensional character of the XB acceptor into open primary networks, which interpenetrate to avoid the presence of voids and to ensure segregation of the modules. Two-dimensional (2D) square 4(4) layers (sql) with fourfold and fivefold interpenetration, as well as an eightfold diamondoid network (dia) of class Ia and a remarkable tenfold dia network of class IIIa, have been obtained. 相似文献
86.
Dr. Maria I. Martinez Espinoza Dr. Lorenzo Sori Dr. Andrea Pizzi Prof. Dr. Giancarlo Terraneo Ivana Moggio Eduardo Arias Dr. Gianluca Pozzi Dr. Simonetta Orlandi Dr. Valentina Dichiarante Prof. Dr. Pierangelo Metrangolo Dr. Marco Cavazzini Prof. Dr. Francesca Baldelli Bombelli 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(38):9078-9087
A small series of boron-dipyrromethene (BODIPY) dyes, characterized by the presence of multibranched fluorinated residues, were designed and synthesized. The dyes differ in both the position (para-perfluoroalkoxy-substituted phenyl ring or boron functionalization) and number of magnetically equivalent fluorine atoms (27 or 54 fluorine atoms per molecule). Photophysical and crystallographic characterization of the synthesized BODIPYs was carried out to evaluate the effect of the presence of highly fluorinated moieties on the optical and morphological properties of such compounds. 相似文献
87.
88.
Dr. Hiroki Takezawa Dr. Takashi Murase Prof. Dr. Giuseppe Resnati Prof. Dr. Pierangelo Metrangolo Prof. Dr. Makoto Fujita 《Angewandte Chemie (International ed. in English)》2015,54(29):8411-8414
The confined space inside a self‐assembled cage enhanced halogen bonding (XB) between iodoperfluorocarbons (XB donors) and NO3? anions or H2O molecules (XB acceptors), as confirmed by NMR spectroscopy in solution and by X‐ray crystallography in the solid state. The cavity also bound an XB donor–acceptor pair, C6F3I3 and C6H5NMe2, in a selective pairwise fashion. 相似文献
89.
Weak solutions to a hydrodynamic model for semiconductors and relaxation to the drift-diffusion equation 总被引:7,自引:0,他引:7
Pierangelo Marcati Roberto Natalini 《Archive for Rational Mechanics and Analysis》1995,129(2):129-145
We investigate the relaxation problem for the hydrodynamic isentropic Euler-Poisson system when the momentum relaxation time tends to zero. Very sharp estimates on the solutions, independent of the relaxation time, are obtained and used to establish compactness. 相似文献
90.
The combined quasineutral and relaxation time limit for a bipolar hydrodynamic model is considered. The resulting limit problem
is a nonlinear diffusion equation describing a neutral fluid. We make use of various entropy functions and the related entropy
productions in order to obtain strong enough uniform bounds. The necessary strong convergence of the densities is obtained
by using a generalized version of the “div-curl” Lemma and monotonicity methods.
Received September 27, 2001; in revised form February 25, 2002 相似文献