排序方式: 共有133条查询结果,搜索用时 515 毫秒
41.
Elmes RB Orange KN Cloonan SM Williams DC Gunnlaugsson T 《Journal of the American Chemical Society》2011,133(40):15862-15865
The synthesis and photophysical and biological investigation of Ru(II)-polypyridyl stabilized water-soluble, luminescent gold nanoparticles (AuNPs) are described. These structures bind to DNA and undergo rapid cellular uptake, being localized within the cell cytoplasm and nucleus within 4 h. 相似文献
42.
1.Eu, a cyclen based Eu(III)-thiol conjugate, was incorporated onto the surface of water-soluble gold nanoparticles to give AuNP-1.Eu. The self-assembly between AuNP-1.Eu and the antenna 2 resulted in the formation of the highly luminescent lanthanide system, AuNP-1.Eu-2, at pH 7.4. The sensing of flavin monophosphate 3 is demonstrated, whereby 3 displaced the antenna 2 in AuNP-1.Eu-2, resulting in the formation of AuNP-1.Eu-3 and quenching of the Eu(III) emission. 相似文献
43.
The design, synthesis and physical evaluation of 1, a visible colorimetric 'naked eye' pyridyl based bis-amidothiourea sensor for anions, is described. This charge neutral sensor gives rise to significant changes in the absorption spectra upon interactions with several important biological anions such as AMP and ADP in 4:1 DMSO-H(2)O solution, while ATP was not detected. These colorimetric changes are due to the formation, or the combination of hydrogen bonding complexes and/or deprotonation between these anions and 1. 相似文献
44.
Dr. Eoin P. McCarney June I. Lovitt Prof. Thorfinnur Gunnlaugsson 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(47):12052-12057
We report the efficient self-templated formation of optically active 2,6-bis(1,2,3-triazol-4-yl)pyridine ( btp ) derived homocircuit [2]catenane enantiomers. This represents the first example of the enantiopure formation of chiral btp homocircuit [2]catenanes from starting materials consisting of a classical chiral element; X-ray diffraction crystallography enabled the structural characterization of the [2]catenane. The self-assembly reaction was monitored closely in solution facilitating the characterization of the pseudo-rotaxane reaction intermediate prior to mechanically interlocking the pre-organised system via ring-closing metathesis. 相似文献
45.
The design, synthesis, and characterization of a novel dinuclear Eu(III) bismacrocyclic conjugate 1.Eu2 as a delayed luminescent lanthanide sensor for dicarboxylates is discussed. The sensor was shown to bind small dicarboxylic acids such as aspartic, malonic, succinic, or glutaric acid in pH 6.5 solutions. However, only malonic acid gave rise to selective Eu(III) luminescent enhancements, as the emission was reduced for all of the other acids. 相似文献
46.
Unexpected Self‐Sorting Self‐Assembly Formation of a [4:4] Sulfate:Ligand Cage from a Preorganized Tripodal Urea Ligand 下载免费PDF全文
Dr. Komala Pandurangan Dr. Jonathan A. Kitchen Dr. Salvador Blasco Dr. Elaine M. Boyle Bella Fitzpatrick Dr. Martin Feeney Prof. Paul E. Kruger Prof. Thorfinnur Gunnlaugsson 《Angewandte Chemie (International ed. in English)》2015,54(15):4566-4570
The design and synthesis of tripodal ligands 1 – 3 based upon the N‐methyl‐1,3,5‐benzenetricarboxamide platform appended with three aryl urea arms is reported. This ligand platform gives rise to highly preorganized structures and is ideally suited for binding SO42? and H2PO4? ions through multiple hydrogen‐bonding interactions. The solid‐state crystal structures of 1 – 3 with SO42? show the encapsulation of a single anion within a cage structure, whereas the crystal structure of 1 with H2PO4? showed that two anions are encapsulated. We further demonstrate that ligand 4 , based on the same platform but consisting of two bis‐urea moieties and a single ammonium moiety, also recognizes SO42? to form a self‐assembled capsule with [4:4] SO42?: 4 stoichiometry in which the anions are clustered within a cavity formed by the four ligands. This is the first example of a self‐sorting self‐assembled capsule where four tetrahedrally arranged SO42? ions are embedded within a hydrophobic cavity. 相似文献
47.
48.
LK Truman S Comby T Gunnlaugsson 《Angewandte Chemie (International ed. in English)》2012,51(38):9624-9627
A pH indicator: Near-infrared emitting lanthanide-functionalized gold nanoparticles have been prepared through self-assembly at the gold surface between a ytterbium(III)-cyclen complex and xylenol orange. Excitation of the xylenol orange unit with visible light, up to 600?nm, results in the sensitization of the Yb(III) -centered near-infrared emission that can be reversibly switched "on-off" as a function of the pH value. 相似文献
49.
Kotova O Daly R dos Santos CM Boese M Kruger PE Boland JJ Gunnlaugsson T 《Angewandte Chemie (International ed. in English)》2012,51(29):7208-7212
Eu(III), the last piece in the puzzle: Europium-induced self-assembly of ligands having a C(3)-symmetrical benzene-1,3,5-tricarboxamide core results in the formation of luminescent gels. Supramolecular polymers are formed through hydrogen bonding between the ligands. The polymers are then brought together into the gel assembly through the coordination of terpyridine ends by Eu(III) ions (blue dashed arrow: distance between two ligands in the strand direction). 相似文献
50.
The design and synthesis of dinuclear-lanthanide complexes possessing triazole-based bridges, formed by using copper catalysed 1,3-cycloaddition reactions between heptadentate alkyne functionalised cyclen europium or terbium complexes and di-azides (CuAAC reactions), are described. While this click reaction worked well for the formation of the homo-Eu(III) and Tb(III) bis-tri-arm cyclen N,N-dimethyl acetamide complexes, 2Eu and 2Tb, and for the homo-Eu(III) chiral N-methylnaphthalene based complexes 3Eu (S,S,S) and 4Eu (R,R,R), the formation of the Eu(III) complex of the primary amide analogue of 2, namely 1Eu, was not successful, clearly demonstrating the effect that the nature of the pendant arms has on this reaction. Furthermore, the click reactions between the free alkyne cyclen bis-derivatives (5-8) and the di-azide were unsuccessful, most likely due to the high affinity of the cyclen macrocycles for Cu(II). The Eu(III) complexes of 2-4 and 2Tb all gave rise to sensitised metal ion centred emission upon excitation of the triazole or the naphthalene antennae in methanol solution, and their hydration states were determined, which showed that while the Eu(III) mono-nuclear complexes had q ~ 2, the click products all had q ~ 1. In the case of 3Eu (S,S,S) and 4Eu (R,R,R), the circular polarised emission (CPL) was also observed for both, demonstrating the chiral environment of the lanthanide centres. 相似文献