排序方式: 共有131条查询结果,搜索用时 109 毫秒
31.
A. L. Vendelboe H. P. Gunnlaugsson Ö. Helgason P. Nørnberg 《Hyperfine Interactions》2005,166(1-4):517-522
The characteristics of both natural burned and experimentally burned soil profiles as seen by Mössbauer spectroscopy are described. The results help in the identification of profiles where biological and/or chemical processes may have been involved. 相似文献
32.
Gunnlaugsson T Kruger PE Jensen P Tierney J Ali HD Hussey GM 《The Journal of organic chemistry》2005,70(26):10875-10878
[structure: see text] The synthesis and UV-vis and NMR spectroscopic studies of thiourea-based colorimetric sensors for anions are presented. These sensors can recognize anions through hydrogen binding even in competitive pH-buffered aqueous solutions, giving rise to large color changes that are clearly visible to the naked eye. 相似文献
33.
This mini review gives some highlights of the work recently carried out in our research group in Dublin on the developments of lanthanide luminescent devices, where the future goal is to produce devices that can operate as sensors. A few examples demonstrate our design principles for targeting both anion and cations that are of biological or pharmaceutical relevance, where the recognition occurs in aqueous competitive media. We also discuss the possibility of developing mixed f-d metal complexes and conjugates that can be employed as novel supramolecular architectures. 相似文献
34.
Colorimetric azobenzene based chemosensors 1 and 2 were designed for detection of transition-metal ions such as Cu(II) under physiological pH conditions. The internal charge transfer (ICT) sensors are highly colored, absorbing in the green. For 1, the Cu(II) recognition gives rise to red-to-yellow color changes that are visible to the naked-eye and reversible upon addition of EDTA, whereas for 2, which lacks the aromatic o-methoxy chelating group, no such changes were observed. 相似文献
35.
Chiroptical Probing of Lanthanide‐Directed Self‐Assembly Formation Using btp Ligands Formed in One‐Pot Diazo‐Transfer/Deprotection Click Reaction from Chiral Amines
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Dr. Joseph P. Byrne Dr. Miguel Martínez‐Calvo Dr. Robert D. Peacock Prof. Thorfinnur Gunnlaugsson 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(2):486-490
A series of enantiomeric 2,6‐bis(1,2,3‐triazol‐4‐yl)pyridines (btp)‐containing ligands was synthesized by a one‐pot two‐step copper‐catalyzed amine/alkyne click reaction. The EuIII‐ and TbIII‐directed self‐assembly formation of these ligands was studied in CH3CN by monitoring their various photophysical properties, including their emerging circular dichroism and circularly polarized luminescence. The global analysis of the former enabled the determination of both the stoichiometry and the stability constants of the various chiral supramolecular species in solution. 相似文献
36.
X‐Ray Diffraction and Mössbauer Spectroscopy Studies of Pressure‐Induced Phase Transitions in a Mixed‐Valence Trinuclear Iron Complex
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Dr. Solveig R. Madsen Dr. Haraldur P. Gunnlaugsson Dr. Stephen A. Moggach Espen Eikeland Dr. Lai‐Chin Wu Dr. Olaf Leupold Dr. Jacob Overgaard Prof. Bo B. Iversen 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(28):9616-9623
The mixed‐valence complex Fe3O(cyanoacetate)6(H2O)3 ( 1 ) has been studied by single‐crystal X‐ray diffraction analysis at pressures up to 5.3(1) GPa and by (synchrotron) Mössbauer spectroscopy at pressures up to 8(1) GPa. Crystal structure refinements were possible up to 4.0(1) GPa. In this pressure range, 1 undergoes two pressure‐induced phase transitions. The first phase transition at around 3 GPa is isosymmetric and involves a 60° rotation of 50 % of the cyanoacetate ligands. The second phase transition at around 4 GPa reduces the symmetry from rhombohedral to triclinic. Mössbauer spectra show that the complex becomes partially valence‐trapped after the second phase transition. This sluggish pressure‐induced valence‐trapping is in contrast to the very abrupt valence‐trapping observed when compound 1 is cooled from 130 to 120 K at ambient pressure. 相似文献
37.
H. P. Gunnlaugsson Á. Höskuldsson S. Steinthorsson N. Óskarsson M. B. Madsen P. Nørnberg J. Merrison G. Larsen 《Hyperfine Interactions》2014,226(1-3):601-612
Mössbauer spectra of samples from the 2010 Fimmvörðuháls/Eyjafjallajökull eruption are presented with determinations of the Fe3?+?/FeTot ratios. Mössbauer spectra of time series of samples from the Eyjafjallajökull eruption show a change in the characteristics of the erupted material mid-way in the eruption, suggesting changing access of water to the eruption. 相似文献
38.
K. M. Ø. Jensen H. P. Gunnlaugsson M. Christensen B. B. Iversen 《Hyperfine Interactions》2014,226(1-3):73-78
Hydrothermally synthesized LiFePO4 has been prepared with different synthesis times in order to study defects in the crystal structure and their evolution. The Mössbauer spectra can be interpreted as due to three components, Fe2+ in LiFePO4, Fe2+ in unreacted precursor material which resembles the Mössbauer spectrum of Fe2+ in vivianite (Fe3(PO4)2·8H2O) and Fe3+. The Fe3+ contribution differs from room temperature oxidation of the precursor material, and can partly be due to charge compensating defects in the LiFePO4 structure. With increasing synthesis time, the latter two contributions virtually disappear from the spectra. 相似文献
39.
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
40.
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