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51.
Comparative Analysis of Conjugated Alkynyl Chromophore–Triazacyclononane Ligands for Sensitized Emission of Europium and Terbium 下载免费PDF全文
Marine Soulié Frédéric Latzko Emmanuel Bourrier Dr. Virginie Placide Dr. Stephen J. Butler Dr. Robert Pal Dr. James W. Walton Dr. Patrice L. Baldeck Dr. Boris Le Guennic Dr. Chantal Andraud Dr. Jurriaan M. Zwier Dr. Laurent Lamarque Prof. David Parker Dr. Olivier Maury 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(28):8636-8646
A series of europium and terbium complexes based on a functionalized triazacyclononane carboxylate or phosphinate macrocyclic ligand is described. The influence of the anionic group, that is, carboxylate, methylphosphinate, or phenylphosphinate, on the photophysical properties was studied and rationalized on the basis of DFT calculated structures. The nature, number, and position of electron‐donating or electron‐withdrawing aryl substituents were varied systematically within the same phenylethynyl scaffold in order to optimize the brightness of the corresponding europium complexes and investigate their two‐photon absorption properties. Finally, the europium complexes were examined in cell‐imaging applications, and selected terbium complexes were studied as potential oxygen sensors. 相似文献
52.
53.
Alexandre Picot Cyril Barsu Boris Le Guennic Chantal Andraud Olivier Maury 《Tetrahedron》2008,64(2):399-411
A series of 2,6- and 4-functionalized dipicolinic acid, ester, or amide featuring π-conjugated substituents such as donor-(phenyl or fluorenyl)-acetylene groups have been synthesized. Four crystallographic structures are reported. The influence of the substituent position, the nature of the donor group, and the conjugated backbone as well as the role of the pyridinic side arms on the absorption and emission properties are studied and discussed on the basis of TD-DFT calculations. 相似文献
54.
55.
Olive Recombinant Hydroperoxide Lyase,an Efficient Biocatalyst for Synthesis of Green Leaf Volatiles
56.
Hao-Jung Chang Mykhailo V. Bondar Dr. Natalia Munera Dr. Sylvain David Dr. Olivier Maury Dr. Gerard Berginc Dr. Boris Le Guennic Dr. Denis Jacquemin Dr. Chantal Andraud Dr. David J. Hagan Dr. Eric W. Van Stryland 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(17):e202104072
The fast relaxation processes in the excited electronic states of functionalized aza-boron-dipyrromethene (aza-BODIPY) derivatives ( 1 – 4 ) were investigated in liquid media at room temperature, including the linear photophysical, photochemical, and nonlinear optical (NLO) properties. Optical gain was revealed for nonfluorescent derivatives 3 and 4 in the near infrared (NIR) spectral range under femtosecond excitation. The values of two-photon absorption (2PA) and excited-state absorption (ESA) cross-sections were obtained for 1–4 in dichloromethane using femtosecond Z-scans, and the role of bromine substituents in the molecular structures of 2 and 4 is discussed. The nature of the excited states involved in electronic transitions of these dyes was investigated using quantum-chemical TD-DFT calculations, and the obtained spectral parameters are in reasonable agreement with the experimental data. Significant 2PA (maxima cross-sections ∼2000 GM), and large ESA cross-sections ∼10−20 m2 of these new aza-BODIPY derivatives 1–4 along with their measured high photostability reveal their potential for photonic applications in general and optical limiting in particular. 相似文献
57.
58.
Maury Bramson J. Theodore Cox David Griffeath 《Probability Theory and Related Fields》1986,73(4):613-625
Summary This paper is a sequel of a paper of Cox and Griffeath “diffusive clustering in the two dimensional voter model”. We continue
our study of the voter model and coalescing random walks on the two dimensional integer lattice. Some exact asymptotics concerning
the rate of clustering in the former process and the coalescence rate of the latter are derived. We use these results to prove
a limit law, announced in that earlier paper, concerning the size of the largest square centered at the origin which is of
solid color at a large time t.
Partially supported by the National Science Foundation under Grant DMS-831080
Partially supported by the National Science Foundation under Grant DMS-841317
Partially supported by the National Science Foundation under Grant DMS-830549 相似文献
59.
Delphine Maury François Couderc Jerzy Czaplicki Jean Christophe Garrigues Véréna Poinsot 《Biomedical chromatography : BMC》2010,24(4):343-346
The monosaccharides GlcNAc (N‐acetylglucosamine) and the home‐made GlcNC16 (N‐palmitoyl‐D‐glucosamine) were labeled with 2‐AB (2‐aminobenzamide) by reductive amination of the sugar. The aldehyde group of the monosaccharide reacts with the amino group of 2‐AB, forming a Schiff base. In the second step, the Schiff base is reduced with sodium cyanoborohydride to yield a stable secondary amine. We describe here a simple and fast procedure. Previous studies reported the same labeling at high concentration (10?1 M) during 30 h with further purification steps. In the present paper all operations were carried out in an Eppendorf tube and the reaction medium was directly analyzed without purification. Using the described protocol, the whole procedure can be accomplished in less than 6 h at 65°C at very low concentration (10?4 M). For both GlcNC16 and GlcNAc, the 2‐AB labeling conditions were optimized and, in addition, new conditions of high‐performance liquid chromatography analysis were developed. These N‐alkylated sugars were analyzed on reversed‐phase HPLC with fluorimetric detection at excitation and emission wavelengths of 340 and 400 nm, respectively. The separation was achieved on a C18 column with a gradient mobile phase composed of water (0.1% formic acid)–methanol (volume varying) in less than 19 min with 12.5 and 18.3 min retention times for GlcNAc and GlcNC16, respectively. Positive‐ion electrospray ionization mass spectrometry (ESI‐MS) analysis enabled their structural determination. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
60.
Tancrez N Feuvrie C Ledoux I Zyss J Toupet L Le Bozec H Maury O 《Journal of the American Chemical Society》2005,127(39):13474-13475
This study descibes for the first time the nonlinear optical (NLO) properties of multipolar lanthanide complexes, Na3[Ln(dipic)3]. The "metal-induced" NLO activity enhancement is confirmed as a general property of f-block elements, and the direct participation of f electrons to the hyperpolarizability beta is strongly supported by experimental data. 相似文献