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排序方式: 共有921条查询结果,搜索用时 15 毫秒
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Fabian Hoffmann Dr. Anna-Lena Leistner Dr. Susanne Kirchner Prof. Dr. Burkhard Luy Dr. Claudia Muhle-Goll Dr. Zbigniew Pianowski 《European journal of organic chemistry》2023,26(20):e202300227
Photochromic supramolecular hydrogels are prospective materials for light-triggered drug release and bionanotechnology. Here we present a structural analysis of peptide-derived photochromic supramolecular hydrogels, which were physically loaded with a selection of biologically related compounds, using advanced techniques of nuclear magnetic resonance. The results enable detailed and correct understanding of the loading process and will allow for correct design of pharmacologically relevant systems for phototriggered drug delivery. 相似文献
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915.
Maria Bruma Elena Hamciuc Burkhard Schulz Thomas Köpnick Yvette Kaminorz Jenifer Robison 《Macromolecular Symposia》2003,199(1):511-521
Aromatic polyamides and polyazomethines with side oxadiazole rings have been synthesized by using aromatic diamines containing pendent substituted oxadiazole groups and a diacid chloride having diphenylsilane or hexafluoroisopropylidene, or an aromatic dialdehyde with fluorene unit, respectively. These polymers were easily soluble in amidic solvents. Very thin films which were deposited from polymer solutions onto silicon wafers exhibited smooth, pinhole-free surface in atomic force microscopy investigations. The polymers showed high thermal stability with decomposition temperature being above 400°C. Some of them exhibited blue photoluminescence, in the range of 450-480 nm, making them promising candidates for future use as high performance materials in the construction of light emitting devices. 相似文献
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918.
Dr. Ya-Ming Tian Evamaria Hofmann Dr. Wagner Silva Xiang Pu Dr. Didier Touraud Prof. Dr. Ruth M. Gschwind Prof. Dr. Werner Kunz Prof. Dr. Burkhard König 《Angewandte Chemie (International ed. in English)》2023,62(17):e202218775
The amino alcohol meglumine solubilizes organic compounds in water and enforces the formation of electron donor acceptor (EDA) complexes of haloarenes with indoles, anilines, anisoles or thiols, which are not observed in organic solvents. UV-A photoinduced electron transfer within the EDA complexes induces the mesolytic cleavage of the halide ion and radical recombination of the arenes leading, after rearomatization and proton loss to C−C or C−S coupling products. Depending on the substitution pattern selective and unique cross-couplings are observed. UV and NMR measurements reveal the importance of the assembly for the photoinduced reaction. Enforced EDA aggregate formation in water allows new activation modes for organic photochemical synthesis. 相似文献
919.
Materials for polymer electronics applications – semiconducting polymer thin films and nanoparticles
U. Asawapirom F. Bulut T. Farrell C. Gadermaier S. Gamerith R. Güntner T. Kietzke S. Patil T. Piok R. Montenegro B. Stiller B. Tiersch K. Landfester E.J.W. List D. Neher C. Sotomayor Torres U. Scherf 《Macromolecular Symposia》2004,212(1):83-92
The paper presents two different approaches to nanostructured semiconducting polymer materials: (i) the generation of aqueous semiconducting polymer dispersions (semiconducting polymer nanospheres SPNs) and their processing into dense films and layers, and (ii) the synthesis of novel semiconducting polyfluorene-block-polyaniline (PF-b-PANI) block copolymers composed of conjugated blocks of different redox potentials which form nanosized morphologies in the solid state. 相似文献
920.
Pascal Püllmann Dominik Homann Tobias A. Karl Burkhard König Martin J. Weissenborn 《Angewandte Chemie (International ed. in English)》2023,62(41):e202307897
Fungal unspecific peroxygenases (UPOs) have gained substantial attention for their versatile oxyfunctionalization chemistry paired with impressive catalytic capabilities. A major drawback, however, remains their sensitivity towards their co-substrate hydrogen peroxide, necessitating the use of smart in situ hydrogen peroxide generation methods to enable efficient catalysis setups. Herein, we introduce flavin-containing protein photosensitizers as a new general tool for light-controlled in situ hydrogen peroxide production. By genetically fusing flavin binding fluorescent proteins and UPOs, we have created two virtually self-sufficient photo-enzymes (PhotUPO). Subsequent testing of a versatile substrate panel with the two divergent PhotUPOs revealed two stereoselective conversions. The catalytic performance of the fusion protein was optimized through enzyme and substrate loading variation, enabling up to 24300 turnover numbers (TONs) for the sulfoxidation of methyl phenyl sulfide. The PhotUPO concept was upscaled to a 100 mg substrate preparative scale, enabling the extraction of enantiomerically pure alcohol products. 相似文献