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21.
Chusaku Ikeda 《Tetrahedron letters》2009,50(26):3349-251
Novel boron-dipyrrins bearing an aryl group and a phenyloxy group linked directly to the boron center have been prepared in high yields from arylboronic acid. The unique coordination geometry around the boron was determined by an X-ray crystallographic analysis. The complexes showed a strong fluorescence, and alkylation of the OH group shifted the emission to a longer wavelength with a larger Stokes shift. 相似文献
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Venkat R. Donuru Giri K. Vegesna Singaravelu Velayudham Ge Meng Haiying Liu 《Journal of polymer science. Part A, Polymer chemistry》2009,47(20):5354-5366
Novel deep‐red emissive poly(2,6‐BODIPY‐ethynylene)s bearing dodecyl side chains (polymers A , B , and C ) have been prepared by palladium‐catalyzed Sonogashira polymerization of 2,6‐diiodo‐functionalized BODIPY monomers with 2,6‐diethynyl‐functionalized BODIPY monomers. These polymers emit in the deep‐red region with emission maxima at up to 690 nm, and exhibit significant red shifts (up to 166 and 179 nm) of both absorption and emission maxima compared with their parent BODIPY dyes due to significant extension of π‐conjugation. These polymers possess good thermal stability with decomposition temperature between 270 and 360 °C. The polymers exhibit a little larger Stokes shifts and shorter lifetime than their corresponding BODIPY dyes. The solid state thin films of polymers A , B , and C emit in near‐infrared region between 723 and 743 nm, and show significantly red shifts (up to 57 nm) in absorption and emission maxima relative to their polymer solution. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 5354–5366, 2009 相似文献
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《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(40):12490-12494
A powerful and concise synthesis of directly linked porphyrin‐BODIPY hybrids has been demonstrated, which consists of condensation of directly linked meso ‐pyrroyl NiII‐porphyrin with arylaldehyde, oxidation with p ‐chloranil, and complexation with BF3⋅Et2O. Synthesized hybrids include porphyrin dimer 6Ni , trimers 8Ni , 9Ni , tetramer 12Ni , pentamer 16Ni , hexamer 13Ni , and nonamers 17Ni and 18Ni . The structures of 6Ni , 9Ni and 12Ni were unambiguously confirmed by X‐ray diffraction analysis. Some NiII porphyrins were effectively converted to the corresponding ZnII porphryins. In these hybrids, the pigments are three‐dimensionally arranged with a face‐to‐face dimeric porphyrin unit in a well‐defined manner, featuring their potential as light‐harvesting antenna and functional hosts. 相似文献
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M. Rajeswara Rao 《Tetrahedron》2010,66(9):1728-1162
3,5-Bis(trimethylsilylethynyl)-4,4-difluoro-8-(4-tolyl)-4-bora-3a,4a-diaza-s-indacene [BODIPY(CCTMS)2] has been synthesized by coupling of 3,5-dibromo-4,4-difluoro-8-(4-tolyl)-4-bora-3a,4a-diaza-s-indacene with trimethylsilylacetylene under pd(0) coupling conditions. The BODIPY(CCTMS)2 was used as a selective colourimetric and fluorescent chemodosimeter for fluoride ion, following the F− ion induced cleavage of trimethylsilyl group, the protecting group of ethyne functionality by monitoring the changes in UV-vis and fluorescence properties. The dosimeter BODIPY(CCTMS)2 display clear changes in colour, absorption and emission bands selectively for F− ion over other anions such as Cl−, Br−, I−, ClO4− and HPO42−. 相似文献
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Mono- and bis-NTA-BODIPY dyes have been efficiently synthesized by amide bond formation between hepta-alkylated meso-aryl-BODIPY derivatives and the free amine of mono- and bis-NTA binder surrogates. These new fluorescent hybrids exhibited valuable photophysical properties under buffered aqueous conditions, thus expanding the arsenal of water-soluble BODIPY dyes for potential labeling and monitoring of biological systems and processes. 相似文献
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Volker Leen Dr. Wenwu Qin Prof. Dr. Wensheng Yang Jie Cui Chan Xu Xiaoliang Tang Dr. Weisheng Liu Prof. Dr. Koen Robeyns Dr. Luc Van Meervelt Prof. David Beljonne Prof. Dr. Roberto Lazzaroni Prof. Dr. Claire Tonnelé Noël Boens Prof. Wim Dehaen Prof. 《化学:亚洲杂志》2010,5(9):2016-2026
Starting from the conformationally unconstrained compound 3,5‐di‐(2‐bromophenoxy)‐4,4‐difluoro‐8‐(4‐methylphenyl)‐4‐bora‐3a,4a‐diaza‐s‐indacene ( 1 ), two BODIPY dyes ( 2 and 3 ) with increasingly rigid conformations were synthesized in outstanding total yields through palladium catalyzed intramolecular benzofuran formation. Restricted bond rotation of the phenoxy fragments leads to dyes 2 and 3 , which absorb and fluoresce more intensely at longer wavelengths relative to the unconstrained dye 1 . Reduction of the conformational flexibility in 2 and 3 leads to significantly higher fluorescence quantum yields compared to those of 1 . X‐ray diffraction analysis shows the progressively more extended planarity of the chromophore in line with the increasing conformational restriction in the series 1 → 2 → 3 , which explains the larger red shifts of the absorption and emission spectra. These conclusions are confirmed by quantum chemical calculations of the lowest electronic excitations in 1 , 1a , 2 , 2a , 3 and dyes of related chemical structures. The effect of the molecular structure on the visible absorption and fluorescence emission properties of 1 , 1a , 2 , 2a , 3 has been examined as a function of solvent by means of the new, generalized treatment of the solvent effect (J. Phys. Chem. B 2009 , 113, 5951–5960). Solvent polarizability is the primary factor responsible for the small solvent‐dependent shifts of the visible absorption and fluorescence emission bands of these dyes. 相似文献
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Monika Hassel Michael G. Cornelius Jochen vom Brocke Heinz H. Schmeiser 《Electrophoresis》2010,31(2):299-302
The model organism Hydra has been used for molecular studies for more than 20 years, however, its DNA base composition has not been determined yet. We have analyzed DNA and total RNA of the freshwater polyp Hydra magnipapillata with two independent procedures of high accuracy and sensitivity – fluorescence labeling of nucleotides followed by CE‐LIF detection and 32P‐postlabeling. DNA of Hydra was digested either to deoxyribonucleoside‐5′‐monophosphates or deoxyribonucleoside‐3′‐monophosphates selectively conjugated with the fluorescent dye 4,4‐difluoro‐5,7‐dimethyl‐4‐bora‐3a,4a‐diaza‐s‐indacene‐3‐propionyl ethylene diamine hydrochloride (BODIPY FL EDA) separated and detected using CE‐LIF. Both versions of the assay revealed a high A+T composition of 78 and 71%, whereas total DNA methylation (5‐methyldeoxycytidine) was 2.6 and 3.1%. Total Hydra RNA showed highest base levels for guanine (33%) and a level of 1.4% for pseudouracil. All values were in good agreement with those determined by the 32P‐postlabeling method. 相似文献
28.
Todd W. Hudnall 《Journal of fluorine chemistry》2010,131(11):1182-1186
4-Chloro-4-phenyl-1,3,5,7,8-pentamethyl-3a,4a-diaza-4-bora-s-indacene (2) has been synthesized, structurally characterized and converted into the corresponding hydroxide derivative 4-hydroxo-4-phenyl-1,3,5,7,8-pentamethyl-3a,4a-diaza-4-bora-s-indacene (3). This boron hydroxide derivative reacts with fluoride anions under acidic conditions to afford the corresponding fluoride derivative 4-fluoro-4-phenyl-1,3,5,7,8-pentamethyl-3a,4a-diaza-4-bora-s-indacene (4). This simple reaction may become useful for the incorporation of [18F]-fluoride and may serve for the preparation of radiolabeled BODIPY derivatives. 相似文献
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Cover Picture: Intracellular Modulation of Excited‐State Dynamics in a Chromophore Dyad: Differential Enhancement of Photocytotoxicity Targeting Cancer Cells (Angew. Chem. Int. Ed. 18/2015) 下载免费PDF全文