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101.
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A Ru(terpy)(phen) motif has been inscribed in a 39-membered ring by functionalizing the ligands and subsequently performing a cyclization reaction on the complex; by visible light irradiation, a dramatic geometrical changeover of the cyclic complex takes place which can be reversed thermally. 相似文献
104.
A novel type of interferometer was designed and tested experimentally. It combines the advantages of the spatial path separation used in the two-wave polarized Jamin interferometer and the high sensitivity that characterizes the multiwave Fabry-Perot interferometer. Furthermore, when it is sandwiched between crossed polarizers it shows a sensitivity to intracavity anisotropies that is proportional to the square of the Fabry-Perot interferometer's finesse. 相似文献
105.
Acetylenes are hydrated in benzene-acetonitrile mixtures in the presence of phosphoric acid saturated with boron trifluoride and in the absence of heavy metal ions to the corresponding ketones in high yields. 相似文献
106.
107.
Solid solutions of hydrogen in thulium are investigated, mainly by X-ray determinations in the temperature range 20–500°C. Several observations lead us to distinguish between two variaties α and α1. In the range of existence of the α1 phase, below the transition temperature of 120°C, the hydrogen interstitials induce in the metal lattice a behaviour different from that of the α phase, as concerns the phase equilibrium, the additional resistivity, and the lattice anisotropy.Several simple models are proposed for the explanation of this anomaly, encountered also in other heavy rate earth-hydrogen systems. 相似文献
108.
Anne‐Sophie Bonnet‐Bendhia Axel Tillequin 《Mathematical Methods in the Applied Sciences》2001,24(14):1089-1111
A generalized mode matching method that applies to a wide class of scattering problems is developed in the time harmonic two‐dimensional Helmholtz case. This method leads by variational means to an integro‐differential formulation whose unknown is the trace of the field on an unbounded one‐dimensional interface. The well‐posedness is proved after a careful study of the rather original functional framework. Owing to a fundamental density result—based upon some properties of a singular integral operator similar to the Hilbert transform—the limiting absorption principle related to this original formulation is established. Finally, two other situations are emphasized. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
109.
A Theranostic Agent Combining a Two‐Photon‐Absorbing Photosensitizer for Photodynamic Therapy and a Gadolinium(III) Complex for MRI Detection
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Julie Schmitt Prof. Valérie Heitz Dr. Angélique Sour Dr. Frédéric Bolze Dr. Pascal Kessler Dr. Lucia Flamigni Dr. Barbara Ventura Dr. Célia S. Bonnet Dr. Éva Tóth 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(8):2775-2786
The convergent synthesis and characterization of a potential theranostic agent, [DPP‐ZnP‐GdDOTA]?, which combines a diketopyrrolopyrrole‐porphyrin component DPP‐ZnP as a two‐photon photosensitizer for photodynamic therapy (PDT) with a gadolinium(III) DOTA complex as a magnetic resonance imaging probe, is presented. [DPP‐ZnP‐GdDOTA]? has a remarkably high longitudinal water proton relaxivity (19.94 mm ?1 s?1 at 20 MHz and 25 °C) for a monohydrated molecular system of this size. The Nuclear Magnetic Relaxation Dispersion (NMRD) profile is characteristic of slow rotation, related to the extended and rigid aromatic units integrated in the molecule and to self‐aggregation occurring in aqueous solution. The two‐photon properties were examined and large two‐photon absorption cross‐sections around 1000 GM were determined between 910 and 940 nm in DCM with 1 % pyridine and in DMSO. Furthermore, the new conjugate was able to generate singlet oxygen, with quantum yield of 0.42 and 0.68 in DCM with 1 % pyridine and DMSO, respectively. Cellular studies were also performed. The [DPP‐ZnP‐GdDOTA]? conjugate demonstrated low dark toxicity and was able to induce high one‐photon and moderate two‐photon phototoxicity on cancer cells. 相似文献
110.
Convenient Access to Fluorescent Probes by Chemoselective Acylation of Hydrazinopeptides: Application to the Synthesis of the First Far‐Red Ligand for Apelin Receptor Imaging
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Dr. Jean‐François Margathe Dr. Xavier Iturrioz Pierre Regenass Iuliia A. Karpenko Dr. Nicolas Humbert Dr. Hugues de Rocquigny Prof. Marcel Hibert Dr. Catherine Llorens‐Cortes Dr. Dominique Bonnet 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(4):1399-1405
Herein, we develop a convenient method to facilitate the solution‐phase fluorescent labelling of peptides based on the chemoselective acylation of α‐hydrazinopeptides. This approach combines the advantages of using commercially available amine‐reactive dyes and very mild conditions, which are fully compatible with the chemical sensitivity of the dyes. The usefulness of this approach was demonstrated by the labelling of apelin‐13 peptide. Various fluorescent probes were readily synthesized, enabling the rapid optimization of their affinities for the apelin receptor. Thus, the first far‐red fluorescent ligand with sub‐nanomolar affinity for the apelin receptor was characterized and shown to track the receptor efficiently in living cells by fluorescence confocal microscopy. 相似文献