1,721,140 research outputs found
Unsymmetrical dendrimers with tridentate pyridylthioether coordination sites as repeating units: useful precursor for the synthesis of palladium-containing metallodendrimers
No full textFAST-ATOM-BOMBARDMENT MASS-SPECTROMETRY OF REACTION-PRODUCTS BETWEEN C3O2 AND STABILIZED PHOSPHORUS YLIDES
No full textA fast atom bombardment (FAB) mass spectrometric study on the open-chain compound 1,3-bis(cyanomethylenetriphenylphosphorane)propane-1,3-dione and on the cyclic zwitterionic compounds 4-oxy-5-triphenylphosphonium-6-methyl-2-pyrone and 4-oxy-5-triphenylphosphonium-6-phenyl-2-pyrone, obtained by reaction of carbon suboxide, C3O2, with stabilized phosphorus ylides, Ph(3)PCHX (X=CN, COMe, COPh), is described. The FAB mass spectrometric behaviour of these compounds is compared with that shown by triphenylphosphoranilideneketene, Ph(3)P=C=C=O, and by 4-hydroxy-6-methyl-2-pyrone, with the aid of metastable ion data and collision spectroscopy
Investigations Using Photo Affinity Labeled Analogues Confirm the Binding between sCD4 and the PND of HIV-1, MN
No full textMatrix Assisted Laser Desorption/Ionization capabilities in the study of non-enzymatic protein glycation.
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FAST-ATOM-BOMBARDMENT MASS-SPECTROMETRY OF CYCLIC HYDRIDO DITHIOCARBENE AND DIOXYCARBENE COMPLEXES OF PLATINUM(II)
No full textThiophenolate clusters as potential nanosized building blocks for zinc-based nanocomposite materials: synthesis and characterization
No full textThe synthesis, the spectroscopic and structural characterization of different thiophenolate-capped zinc clusters are reported and described. In particular, different reactions of 4-chlorobenzenethiol with zinc salts yield the clusters [Me4N][Et3NH][Zn4(mu-S-C6H4-Cl)6(S-C6H4-Cl)4] (2a), [Et3NH]2[Zn4(mu-S-C6H4-Cl)6(S-C6H4-Cl)4] (2b), and [Me4N]2[Zn4(mu-S-C6H4-Cl)6(S-C6H4-Cl)4] (2c), and also the thiophenolate derivative [Et3NH]2[Zn4(mu-S-C6H5)6(S-C6H5)4] (1b) was obtained. The nanosized thiophenolate-capped clusters were investigated by 1H and 13C NMR, elemental analysis, and electrospray ionization (ESI) mass spectrometry. NMR experiments provided insights into the dynamic behaviour of the clusters. The thermal decomposition patterns of 2c were analyzed in air as well as in nitrogen, indicating the formation of zinc oxide and metallic zinc, respectively. The X-ray structure of 2a revealed that the cluster core consists of an adamantane-like framework analogous to those realized in many other M4(SR)10 metal complexes
Synthesis and characterization of tri-block fluorinated-n-alkanes
No full textA series of triblock semifluorinated n-alkanes of general formula F(CF2)(n)(CH2) (CF2)(m)F (n = 6, 8 and m = 4, 6, 8) have been synthesized and characterized. The synthesis of triblock compounds was performed in two different ways according to the length of the hydrogenated moiety. Coupling of two molecules of beta-(perfluoro-n-alkyl)ethyl iodides leads to the triblock materials F(CF2)(6)(CH2)(4)(CF2)(6)F and F(CF2)(8)(CH2)(4)(CF2)(8)F. The synthesis of compounds with larger hydrogenated part is accomplished in two steps by the addition of perfluoro-n-alkyl iodide F(CF2)(n)l to 1,5-hexadiene and 1,7-octadiene, respectively to give the diiodo-adducts which are subsequently deiodinated to the final triblock products F(CF2)(6)(CH2)(6)(CF2)(6)F, F(CF2)(6)(CH2)(8)(CF2)(6)F, F(CF2)(8)(CH2)(6)(CF2)(8)F and F(CF)(8)(CH2)(8)(CF2)(8)F. The obtained triblock semifluorinated n-alkanes are characterized by low surface free energies with good lubricant properties usable as additives in ski-wax formulations. (C) 2007 Elsevier B.V. All rights reserved
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