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31.
This paper is concerned with the low Mach number limit for the compressible Navier-Stokes equations in an exterior domain.We present here an approach based on Strichartz estimate defined on a non trapp... 相似文献
32.
Dr. Giulia Neri Dr. Giuliana Mion Dr. Andrea Pizzi Dr. Wanda Celentano Dr. Linda Chaabane Prof. Michele R. Chierotti Prof. Roberto Gobetto Dr. Min Li Prof. Piergiorgio Messa Dr. Floryan De Campo Prof. Francesco Cellesi Prof. Pierangelo Metrangolo Prof. Francesca Baldelli Bombelli 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(44):10057-10063
In the continuous search for multimodal systems with combined diagnostic and therapeutic functions, several efforts have been made to develop multifunctional drug delivery systems. In this work, through a covalent approach, a new class of fluorinated poly(lactic-co-glycolic acid) co-polymers (F-PLGA) were designed that contain an increasing number of magnetically equivalent fluorine atoms. In particular, two novel compounds, F3-PLGA and F9-PLGA, were synthesized and their chemical structure and thermal stability were analyzed by solution NMR, DSC, and TGA. The obtained F-PLGA compounds were proven to form in aqueous solution colloidal stable nanoparticles (NPs) displaying a strong 19F NMR signal. The fluorinated NPs also showed an enhanced ability to load hydrophobic drugs containing fluorine atoms compared to analogous pristine PLGA NPs. Preliminary in vitro studies showed high cell viability and the NP ability to intracellularly deliver and release a functioning drug. 相似文献
33.
Dr. Daniele Maiolo Dr. Andrea Pizzi Dr. Alessandro Gori Dr. Lara Gazzera Dr. Nicola Demitri Dr. Alessandro Genoni Dr. Fulvio Baggi Dr. Fabio Moda Prof. Dr. Giancarlo Terraneo Prof. Dr. Francesca Baldelli Bombelli Prof. Dr. Pierangelo Metrangolo Prof. Dr. Giuseppe Resnati 《ChemistryOpen》2020,9(2):253-260
Here, we demonstrate that introduction of halogen atoms at the tyrosine 10 phenol ring of the DSGYEV sequence derived from the flexible amyloid-β N-terminus, promotes its self-assembly in the solid state. In particular, we report the crystal structures of two halogen-modified sequences, which we found to be stabilized in the solid state by halogen-mediated interactions. The structural study is corroborated by Non-Covalent Interaction (NCI) analysis. Our results prove that selective halogenation of an amino acid enhances the supramolecular organization of otherwise unstructured biologically-relevant sequences. This method may develop as a general strategy for stabilizing highly polymorphic peptide regions. 相似文献
34.
35.
Alessandra Farina Stefano Valdo Meille Maria Teresa Messina Pierangelo Metrangolo Giuseppe Resnati Giuseppe Vecchio 《Angewandte Chemie (International ed. in English)》1999,38(16):2433-2436
Halogen bonds , attractive intermolecular interactions between perfluoroalkyl bromides and bromide ions, are present in cocrystals of (−)-sparteinium hydrobromide ( 1 ) and (S)-1,2-dibromohexafluoropropane ( 2 ; shown schematically), and result in enantiopure and infinite supramolecular helices. The perfluorocarbon–hydrocarbon self-assembly allows the resolution of racemic 2 . 相似文献
36.
This paper regards the existence of entropy waves for a model example of nonstrictly hyperbolic system which degenerates on a sonic line. This construction is an important tool to approach the convergence of the vanishing viscosity and of other similar approximations to the weak solutions of the hyperbolic systems, via the compensated compactness techniques. 相似文献
37.
Stefano Cicchi Dr. Pierangelo Fabbrizzi Dr. Giacomo Ghini Dr. Alberto Brandi Prof. Paolo Foggi Prof. Agnese Marcelli Dr. Roberto Righini Prof. Chiara Botta Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(3):754-764
A series of dendrimeric compounds bearing pyrene units were synthesized to afford light‐harvesting antennae based on the formation of intramolecular excimers. The synthetic plan profited from the efficiency of the Huisgen reaction, the 1,3‐dipolar cycloaddition of azides and terminal alkynes, which allowed ready assembly of the different building blocks. The three molecular antennae obtained, of increasing generation, revealed efficient energy transfer both in solution and in the solid state. 相似文献
38.
Maria Teresa Messina Pierangelo Metrangolo Silvio Quici Amedea Manfredi Tullio Pilati 《Supramolecular chemistry》2013,25(4):405-410
Abstract 4′-(4-Methylphenyl)-2,2′:6′,2″-terpyridine (1) self-assembles with dihaloperfluoroarenes (2). A chemo- and site-selective supramolecular synthesis occurs which preserves in the solid cocrystal the most stable s-trans, s-trans conformation of the pure terpyridine module. The single crystal X-ray structure of 3a, prepared from 1 and 1,4-diiodotetrafluorobenzene (2a) (monoclinic, a = 14.608(1), b = 13.276(1), c = 13.970(2) Å, β = 109.808(8)°, U = 2549.4 (4) Å3, T = 291 (1) K, space group C2/c Z = 4; μ(Mo-Kα) = 2.519 mm?1; d calc.: 1.890 g cm?3; 5748 reflections measured, 3715 unique (Rint = 0.024) which were used in all calculations; the final R and wR (F 2) were 0.043 and 0.069, respectively) shows the presence of infinite ribbons where the two modules alternate in a zigzag arrangement. 相似文献
39.
Giuseppe Gattuso Rosalba Liantonio Pierangelo Metrangolo Franck Meyer Andrea Pappalardo 《Supramolecular chemistry》2013,25(3):235-243
1,3-Bis(α-picolyloxy)-p-tert-butylcalix[4]crown-5 in the cone conformation (2), 1,8-diiodoperfluorooctane or 1,6-diiodoperfluorohexane, and potassium iodide ternary mixtures undergo in solution self-sorting and afford crystalline “supramolecular salts”. These hybrid materials consist of supercation [K+ ? 2] and superanion [I–(CF2) n –I…I? …I–(CF2) n –I…I? …] (n = 6,8) components. In the supercations the potassium ion is embedded in the ionophoric pocket created by the heteroatoms present at the lower rim. In the superanions the iodide ions form infinite fluorous polyanionic chains as a result of a self-assembly process which relies on halogen bonding. Both cation encapsulation and anion-perfluorocarbon halogen bonding were detected in solution by 1H and 19F NMR, and in the gas phase by ESI MS. 相似文献
40.
De Santis A Forni A Liantonio R Metrangolo P Pilati T Resnati G 《Chemistry (Weinheim an der Bergstrasse, Germany)》2003,9(16):3974-3983
The N.Br halogen bonding drives the self-assembly of 1,4-dibromotetrafluorobenzene (1 a) and its 1,3 or 1,2 analogues (1 b,c, respectively) with dipyridyl derivatives 2 a,b. The isomeric supramolecular architectures 3 a-f are obtained as cocrystals that are stable in the air at room temperature. The solid-state features of these 1D infinite chains 3 have been fully characterized by single-crystal X-ray, Raman, and IR analyses. The occurrence of N.Br halogen bonding in solution has been detected with (19)F NMR spectroscopy. The N.Br halogen bonding is highly selective and directional and the geometry of the single strands of noncovalent copolymers 3 is programmed by the geometry of halogen-bonding donor and acceptor sites on the starting modules. The composition and topology of the instructed networks can be predicted with great accuracy. Experiments of competitive cocrystal formation established the strength of the N.Br interaction relative to other halogen bondings and the ability of different modules 1 to be involved in site-selective supramolecular syntheses. 相似文献