排序方式: 共有21条查询结果,搜索用时 15 毫秒
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Martin AD Boulos RA Hubble LJ Hartlieb KJ Raston CL 《Chemical communications (Cambridge, England)》2011,47(26):7353-7355
p-Phosphonic acid calix[5]arene forms molecular capsules in water based on two of the molecules, which can be loaded with carboplatin using intense shearing, and attached to single wall carbon nano-tubes. Spin coating of the capsules onto a substrate affords 2 nm fibres of stacked calixarenes, with the self-assembly understood using molecular modelling. 相似文献
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Christoph Englert Dr. Ivo Nischang Cornelia Bader Philipp Borchers Julien Alex Michael Pröhl Martin Hentschel Dr. Matthias Hartlieb Dr. Anja Traeger Prof. Dr. Georg Pohnert Dr. Stephanie Schubert Dr. Michael Gottschaldt Prof. Dr. Ulrich S. Schubert 《Angewandte Chemie (International ed. in English)》2018,57(9):2479-2482
A benzoin‐derived diol linker was synthesized and used to generate biocompatible polyesters that can be fully decomposed on demand upon UV irradiation. Extensive structural optimization of the linker unit was performed to enable the defined encapsulation of diverse organic compounds in the polymeric structures and allow for a well‐controllable polymer cleavage process. Selective tracking of the release kinetics of encapsulated model compounds from the polymeric nano‐ and microparticle containers was performed by confocal laser scanning microscopy in a proof‐of‐principle study. The physicochemical properties of the incorporated and released model compounds ranged from fully hydrophilic to fully hydrophobic. The demonstrated biocompatibility of the utilized polyesters and degradation products enables their use in advanced applications, for example, for the smart packaging of UV‐sensitive pharmaceuticals, nutritional components, or even in the area of spatially selective self‐healing processes. 相似文献
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A. Brockhinke A.T. Hartlieb K. Kohse-Höinghaus D.R. Crosley 《Applied physics. B, Lasers and optics》1998,67(5):659-665
2 in a flame, excited by a tunable KrF laser near 248 nm. The first comprises several P and R lines of the (1,0) band of the
e 3Πg-a 3Πu Fox–Herzberg system, with fluorescence bands extending past 350 nm. The second is the band head region of the (7,1) band
of the D 1Σu
+←B′ 1Σg
+ system, with fluorescence at 232 nm from D to the X 1Σg
+ ground state. Neither band has been previously observed in any environment. The flame in these experiments is highly sooting,
and the C2 seen here is likely produced by laser vaporization of the soot with subsequent laser photolysis of a C2 precursor. In a rich flame, this fluorescence could cause interferences in other studies such as KrF laser Raman scattering.
Moreover, signal level calculations suggest native C2 near 10 ppm could be readily observed using the Fox–Herzberg excitation. Raman measurements of major species (X≥0.01) in
the same flame, using the KrF laser, are in good agreement with a model prediction.
Received: 2 April 1998/Revised version: 8 June 1998 相似文献
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Ashish N. Basuray Dr. Henri‐Pierre Jacquot de Rouville Dr. Karel J. Hartlieb Dr. Takashi Kikuchi Nathan L. Strutt Carson J. Bruns Michael W. Ambrogio Alyssa‐Jennifer Avestro Dr. Severin T. Schneebeli Albert C. Fahrenbach Prof. J. Fraser Stoddart 《Angewandte Chemie (International ed. in English)》2012,51(47):11872-11877
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AC Fahrenbach KJ Hartlieb CH Sue CJ Bruns G Barin S Basu MA Olson YY Botros A Bagabas NH Khdary JF Stoddart 《Chemical communications (Cambridge, England)》2012,48(73):9141-9143
Charged donor-acceptor [2]catenanes containing cyclobis(paraquat-p-phenylene) as the ring component can be synthesised in yields of up to 88% in under one hour by heating two precursors in the presence of macrocyclic polyether templates in N,N-dimethylformamide at 80 °C. 相似文献
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Photoinduced Electron Transfer within a Zinc Porphyrin–Cyclobis(paraquat‐p‐phenylene) Donor–Acceptor Dyad 下载免费PDF全文
Dr. Maher Fathalla Dr. Jonathan C. Barnes Prof. Ryan M. Young Dr. Karel J. Hartlieb Scott M. Dyar Samuel W. Eaton Dr. Amy A. Sarjeant Prof. Dick T. Co Prof. Michael R. Wasielewski Prof. J. Fraser Stoddart 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(45):14690-14697
Understanding the mechanism of efficient photoinduced electron‐transfer processes is essential for developing molecular systems for artificial photosynthesis. Towards this goal, we describe the synthesis of a donor–acceptor dyad comprising a zinc porphyrin donor and a tetracationic cyclobis(paraquat‐p‐phenylene) (CBPQT4+) acceptor. The X‐ray crystal structure of the dyad reveals the formation of a dimeric motif through the intermolecular coordination between the triazole nitrogen and the central Zn metal of two adjacent units of the dyad. Photoinduced electron transfer within the dyad in MeCN was investigated by femtosecond and nanosecond transient absorption spectroscopy, as well as by transient EPR spectroscopy. Photoexcitation of the dyad produced a weakly coupled ZnP+.–CBPQT3+. spin‐correlated radical‐ion pair having a τ=146 ns lifetime and a spin–spin exchange interaction of only 0.23 mT. The long radical‐ion‐pair lifetime results from weak donor–acceptor electronic coupling as a consequence of having nine bonds between the donor and the acceptor, and the reduction in reorganization energy for electron transfer caused by charge dispersal over both paraquat units within CBPQT3+.. 相似文献