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71.
Jatin Kumar Antoine Bousquet Martina H. Stenzel 《Macromolecular rapid communications》2011,32(20):1620-1626
A poly(tert‐butyl acrylate) (P(tBA)) with a glycodendric endfunctionality with eight glucose moieties was synthesised in four steps via a combination of esterification, thiol‐alkyne conjugation and hetero‐Diels–Alder (HDA) cycloaddition. A linear glycopolymer of similar size and composition was also synthesised in order to compare the protein binding characteristics of the polymer with glycodendritic endfunctionality to the linear glycol blockcopolymer. The two amphiphilic polymers were self‐assembled in water into micelles. These particles were then tested for their ability to bind to Concanavalin A (Con A). In a turbidity assay, the polymer glycodendron exhibited a significantly faster clustering rate to the lectin as compared to the linear glycopolymer. In a precipitation assay, it is found that significantly less glucose residue is required for binding per Con A for the polymer with the glycodendritic endfunctionality.
72.
An efficient methodology for synthesis of isoindoloisoquinoline 5a and isoindolobenzazepine 5b in oxidized forms as tetracyclic alkaloids cores are reported from N-bromoethylphthalimide (6) or phthalic anhydride and 2-phenylthioethylamine (8) in a five- or six-step sequence, respectively, in overall very good yields. The key step of this methodology is based on an intramolecular π-cationic cyclization of the thionium ion species. Alternatively, another four-step route was explored and based in an ultimate step on the cyclodehydration of an aldehyde functionality, which used as intermediate in the latest strategy, via the oxonium ion cation. 相似文献
73.
74.
We use symmetry analysis to show that the G-, C-, and A-type antiferromagnetic Pnma perovskites can exhibit magnetoelectric (ME) responses when a ferroelectric instability is induced with epitaxial strain. Using first-principles calculations we compute the values of the allowed ME response in strained CaMnO_{3} as a model system. Our results show that large linear and non-linear-ME responses are present and can diverge when close to the ferroelectric phase transition. By decomposing the electronic and ionic contributions, we explore the detailed mechanism of the ME response. 相似文献
75.
Yong Miao Yupin Phuphuak Cyril Rousseau Till Bousquet André Mortreux Suwabun Chirachanchai Philippe Zinck 《Journal of polymer science. Part A, Polymer chemistry》2013,51(10):2279-2287
Binaphthyl‐diyl hydrogen phosphate has been assessed for the first time as a catalyst for the ring‐opening polymerization of ε‐caprolactone (CL) and δ‐valerolactone (VL). In the presence of benzyl alcohol as coinitiator at 40–60 °C, the polymerization is quantitative and controlled both in terms of dispersity and of number‐average molecular weight corresponding to the monomer/initiator ratio. The use of a selectively protected D ‐glucose derivative bearing the primary C6 hydroxyl group as initiator leads to the quantitative end‐functionalization of the polyesters in rather short reaction times (ca. 10 min at 60 °C for δ‐VL) with dispersities around 1.08–1.10. Methyl‐α‐D ‐glucopyranoside has been used as a carbohydrate polyol initiator in bulk. The initiation efficiency is partial, leading to hydrophilic carbohydrates functionalized polylactones in a one‐step procedure. © 2013 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013 相似文献
76.
A. Krämer M. L. Elidrissi-Moubtassim C. Bousquet J. Olivier-Fourcade J. -C. Jumas J. L. Tirado 《Il Nuovo Cimento D》1996,18(2-3):237-241
Summary We present here a study carried out on In16Sn4S32 and In16Fe8S32 spinels. Electronic and local environment changes of Sn and Fe are discussed from recorded M?ssbauer parameters. In the case
of the tin thiospinel, a reduction process from SnIV to SnII is obvious till an amount of 8 inserted Li. For the iron thiospinel a migration of iron atoms from the octahedral to the
tetrahedral sites is observed. In the region of higher lithium amounts (10– Li), in both spinels a further environment appears
indicating an increase of covalency.
Paper presented at ICAME-95, Rimini, 10–16 September 1995. 相似文献
77.
Pierre Bousquet 《Journal d'Analyse Mathématique》2007,102(1):311-346
We are interested in the location of the singularities of maps u ∈ W
s,p
(S
N
, S
1) when 1 ≤ sp and 1 < sp < 2. To this end, we consider the distributional Jacobian. We show that the range of this operator on W
s,p
(S
N
, S
1) is the closure in W
s−2,p
⋂ W
−1,sp
of the set of N − 2-currents defined as the integration on smooth oriented N − 2-dimensional boundaryless submanifolds. 相似文献
78.
Controlling the fluorescence quantum yields of benzothiazole-difluoroborates by optimal substitution
Patryk Rybczyski Manon H. E. Bousquet Anna Kaczmarek-Kdziera Beata Jdrzejewska Denis Jacquemin Borys Omiaowski 《Chemical science》2022,13(45):13347
Precise tuning of the fluorescence quantum yield, vital for countless applications of fluorophores, remains exceptionally challenging due to numerous factors affecting energy dissipation phenomena often leading to its counterintuitive behavior. In contrast to the absorption and emission wavelength which can be precisely shifted to the desired range by simple structural changes, no general strategy exists for controllable modification of the fluorescence quantum yield. The rigidification of the molecular skeleton is known to usually enhance the emission and can be practically realized via the limiting molecular vibrations by aggregation. However, the subtle balance between the abundant possible radiative and non-radiative decay pathways makes the final picture exceptionally sophisticated. In the present study, a series of nine fluorophores obtained by peripheral substitution with two relatively mild electron donating and electron withdrawing groups are reported. The obtained fluorescence quantum yields range from dark to ultra-bright and the extreme values are obtained for the isomeric molecules. These severe changes in emission efficiency have been shown to arise from the complex relationship between the Franck–Condon excited state and conical intersection position. The experimental findings are rationalized by the advanced quantum chemical calculations delivering good correlation between the measured emission parameters and theoretical radiative and internal conversion rate constants. Therefore, the described substituent exchange provides a method to rigorously adjust the properties of molecular probes structurally similar to thioflavin T.A full palette of FQY (form ca. 0 to 98%) was covered by exchanging two groups in a series of nine compounds. The darkest (OMe/CF3) and brightest (CF3/OMe) are isomers. All experimental data are supported by TD-DFT calculations. 相似文献
79.
Afridi Zamader Dr. Bertrand Reuillard Dr. Jacques Pécaut Prof. Dr. Laurent Billon Dr. Antoine Bousquet Dr. Gustav Berggren Dr. Vincent Artero 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(69):e202202260
Surface integration of molecular catalysts inspired from the active sites of hydrogenase enzymes represents a promising route towards developing noble metal-free and sustainable technologies for H2 production. Efficient and stable catalyst anchoring is a key aspect to enable this approach. Herein, we report the preparation and electrochemical characterization of an original diironhexacarbonyl complex including two pyrene groups per catalytic unit in order to allow for its smooth integration, through π-interactions, onto multiwalled carbon nanotube-based electrodes. In this configuration, the grafted catalyst could reach turnover numbers for H2 production (TONH2) of up to 4±2×103 within 20 h of bulk electrolysis, operating at neutral pH. Post operando analysis of catalyst functionalized electrodes revealed the degradation of the catalytic unit occurred via loss of the iron carbonyl units, while the anchoring groups and most part of the ligand remained attached onto multiwalled carbon nanotubes. 相似文献
80.
Eubank JF Wojtas L Hight MR Bousquet T Kravtsov VCh Eddaoudi M 《Journal of the American Chemical Society》2011,133(44):17532-17535
A new pillaring strategy, based on a ligand-to-axial approach that combines the two previous common techniques, axial-to-axial and ligand-to-ligand, and permits design, access, and construction of higher dimensional MOFs, is introduced and validated. Trigonal heterofunctional ligands, in this case isophthalic acid cores functionalized at the 5-position with N-donor (e.g., pyridyl- or triazolyl-type) moieties, are designed and utilized to pillar pretargeted two-dimensional layers (supermolecular building layers, SBLs). These SBLs, based on edge transitive Kagomé and square lattices, are cross-linked into predicted three-dimensional MOFs with tunable large cavities, resulting in isoreticular platforms. 相似文献