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Valeria Blangy Dr. Christoph Heiss Dr. Vsevolod Khlebnikov Christophe Letondor Dr. Helen Stoeckli‐Evans Prof. Dr. Reinhard Neier Prof. Dr. 《Angewandte Chemie (International ed. in English)》2009,48(9):1688-1691
New tricks for an old dog : Calixpyrroles bind anions efficiently and can be transformed into transition‐metal complexes only under forcing conditions. Reducing the macrocycle creates a ligand that easily forms classical Werner complexes with copper, nickel, and palladium ions. The metal complexes present an array of four directed hydrogen bonds, which specifically bind the counterions (see picture; blue N, white H, green Cl, red Cu, Ni, or Pd).
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Wayne Ouellette Dr. Andrey V. Prosvirin Dr. Kelly Whitenack Kim R. Dunbar Prof. Jon Zubieta Prof. 《Angewandte Chemie (International ed. in English)》2009,48(12):2140-2143
Fixing a hole : Hydrothermal chemistry has been exploited in the preparation of a 3D framework material exhibiting 48 % accessible void volume and 1.5 % hydrogen uptake by weight at 120 kPa (see picture). The title compound also exhibits single‐chain magnetic behavior and reversible changes in magnetic properties upon solvation and desolvation.
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Binding of Ionic Species: A General Approach To Measuring Binding Constants and Assessing Affinities
Stefano Roelens Dr. Alberto Vacca Prof. Chiara Venturi 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(11):2635-2644
Bound together : The association of receptors with ionic species cannot be assimilated to the binding of neutral guests. When dealing with salts, both ion pairing and binding to the free and the ion‐paired ionic guest determine the actual association pattern (see figure). The general issue of measuring association constants and assessing affinities for ions is addressed and validated in two cases of anion binding.
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Jörn Schmedt auf der Günne Dr. 《Angewandte Chemie (International ed. in English)》2009,48(19):3401-3403
On an atomic scale and with high sensitivity, solid‐state NMR spectroscopy can provide information about the electronic spin density and coupling mechanisms in paramagnetic compounds. The picture shows how the hyperfine splitting collapses through relaxation. Insights into which compounds are suitable and which approximations have to be made are given.
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Takaaki Tsuruoka Dr. Shuhei Furukawa Dr. Yohei Takashima Kaname Yoshida Dr. Seiji Isoda Prof. Susumu Kitagawa Prof. 《Angewandte Chemie (International ed. in English)》2009,48(26):4739-4743
A growing attachment : Porous coordination polymer (PCP) nanorods are synthesized by modulation of the coordination equilibria between framework components, which regulates the rate of framework extension and crystal growth. Investigation of the crystal growth mechanism by TEM indicates that face‐selective modulation on the surfaces of PCP crystals enhances the anisotropic crystal growth of nanorods by an oriented attachment mechanism.
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Herbert Meier Prof. Dr. 《Angewandte Chemie (International ed. in English)》2009,48(22):3911-3913
En route to molecular electronics : As extended, conjugated oligomers are desirable for molecular electronics, their electrical conductance should display a low attenuation factor. Zinc‐complexed oligo(ethynyleneporphyrindiylethynylene)s have been prepared that are distinguished by ultralow attenuation factors in single‐molecule conductance.
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Peter Jutzi Prof. Dr. Kinga Leszczyńska Dr. Beate Neumann Wolfgang W. Schoeller Prof. Dr. Hans‐Georg Stammler Dr. 《Angewandte Chemie (International ed. in English)》2009,48(14):2596-2599
Si takes a rest : A bulky σ‐bound terphenyl substituent and a π‐bound Cp* ligand enable the isolation and full characterization of the first aryl‐substituted, monomeric silicon(II) compound 1 , which can be regarded as the “resting state” of a true silylene containing a σ‐bound Cp* group. The conformation of the aryl group prevents aryl–Si π back‐bonding.
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Bleached out: The detection of an oxidized co‐product, hydrogen peroxide, during an important tropospheric reaction, combined with the detection of photoaccelerated surface nitrate formation (a competing pathway), allows a likely mechanism to be proposed (see figure) which explains previously observed experimental stoichiometries.
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Andrei Ghicov Sergiu P. Albu Robert Hahn Doohun Kim Thomas Stergiopoulos Dr. Julia Kunze Dr. Carl‐Albrecht Schiller Polycarpos Falaras Prof. Patrik Schmuki Prof. 《化学:亚洲杂志》2009,4(4):520-525
Particle vs tube : The present paper systematically investigates a range of fundamental geometrical and structural features of TiO2 nanotube layers and their effect on the dye‐sensitized solar cell conversion efficiency, to deduce the most promising strategies for improvement. It is found that the performance of the cells strongly depends on the morphology and crystalline structure of the nanotubes.
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Molecular architecture affects the properties of surface layers. Photosensitive silanes with branched architectures allow patterning and coupling of proteins and cells on surfaces while maintaining their biofunctional state. Attachment can be directed to the activated regions of irradiated substrates with high selectivity (see image of mouse fibroblasts).
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A few‐state model predicts that spectral properties of some quadrupolar chromophores are affected by the application of static electric fields. These dyes can monitor neuronal activity (action potential), as a sensitive and versatile alternative to classical dipolar dyes and can also be used in organic LEDs: color‐tunable and/or white‐light emission is obtained by varying the working voltage (see chromaticity diagram).
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Assaf Tal Boaz Shapira Dr. Lucio Frydman Prof. 《Angewandte Chemie (International ed. in English)》2009,48(15):2732-2736
Scan and deliver : By combining imaging‐based spectral/spatial 2D radiofrequency manipulations (see scheme, left) with Hadamard‐weighting principles, 2D NMR spectra can be retrieved within a single scan (right). This approach can give homo‐ or heteronuclear correlations with an enhanced sensitivity over conventional ultrafast 2D NMR spectroscopy.
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Liqing Ma Dr. Wenbin Lin Prof. 《Angewandte Chemie (International ed. in English)》2009,48(20):3637-3640
Stop the breathing : As the organic bridging ligands become more elaborate and large, the resulting MOFs tend to experience significant framework distortion (i.e., breathing) upon solvent removal. Rigidification of MOFs that are built from elongated tetracarboxylate bridging ligands by unusual interlocking and interpenetration leads to highly porous and robust hybrid materials.