نتایج جستجو برای: phosphonic acids

تعداد نتایج: 265789  

Journal: :The Journal of the Society of Chemical Industry, Japan 1968

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Journal: :Bulletin of the Chemical Society of Japan 1976

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Journal: :Symmetry 2021

The self-association of phosphonic acids with general formula RP(O)(OH)2 in solution state remains largely unexplored. understanding is that such molecules form multiple intermolecular hydrogen bonds, but the stoichiometry self-associates and bonding motifs are unclear. In this work, we report results study tert-butylphosphonic acid using low temperature liquid-state 1H 31P NMR spectroscopy (10...

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Journal: :Analytical chemistry 2002
Eun Kyung Lee Bong Rae Cho Hui Hu Richard A Bartsch

Sixteen lipophilic N-(X)sulfonyl carbamoyl lariat ethers with polyether ring sizes of 12-crown-4, 14-crown-4, 15-crown-5, and 18-crown-6 are utilized for competitive alkali metal cation extractions from aqueous solutions into chloroform. Variation of the electron-withdrawing properties of X in the series of methyl, phenyl, 4-nitrophenyl, and trifluoromethyl allows the influence of the acidity o...

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Journal: :Langmuir : the ACS journal of surfaces and colloids 2008
Ute Zschieschang Marcus Halik Hagen Klauk

We have developed a manufacturing process for organic thin-film transistors and organic complementary circuits in which a microcontact-printed phosphonic acid self-assembled monolayer is employed first as an etch resist to pattern aluminum gate electrodes by wet etching and then as the gate dielectric of the same device. To our knowledge, this is the first report of a printing process for elect...

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2012
Gavin A. Buckholtz Ellen S. Gawalt

The formation of methyl-terminated carboxylic acid self-assembled monolayers (SAMs) with even numbers of carbons, from eighteen to thirty, was investigated on the oxide surface of Ti-6Al-4V and component metal oxides. Modified surfaces were characterized using diffuse reflectance infrared Fourier transform spectroscopy (DRIFT), matrix assisted laser desorption ionization-time of flight mass spe...

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2001
Victor F. Puntes Kannan M. Krishnan Paul Alivisatos

A method of producing high-quality magnetic colloidal dispersions by the rapid pyrolysis of cobalt carbonyl in an inert atmosphere was employed to produce monodispersed, stabilized, defect-free «-cobalt nanocrystals, with spherical shapes and sizes ranging from 3 to 17 nm. The size distribution and the shape of the nanocrystals were controlled by varying the surfactant ~oleic acid, phosphonic o...

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Journal: :Proceedings of the National Academy of Sciences of the United States of America 2013
Wei Zhu Yonghui Zhang William Sinko Mary E Hensler Joshua Olson Katie J Molohon Steffen Lindert Rong Cao Kai Li Ke Wang Yang Wang Yi-Liang Liu Anna Sankovsky César Augusto F de Oliveira Douglas A Mitchell Victor Nizet J Andrew McCammon Eric Oldfield

With the rise in resistance to antibiotics such as methicillin, there is a need for new drugs. We report here the discovery and X-ray crystallographic structures of 10 chemically diverse compounds (benzoic, diketo, and phosphonic acids, as well as a bisamidine and a bisamine) that inhibit bacterial undecaprenyl diphosphate synthase, an essential enzyme involved in cell wall biosynthesis. The in...

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Journal: :Organic & biomolecular chemistry 2011
Ivana Kóšiová Miloš Buděšínský Natalya Panova Ivan Rosenberg

The synthesis of the novel nucleotide analogues 5'-deoxynucleoside-5'-S-methylphosphonates, starting from 5'-deoxy-5'-haloribonucleosides, 5'-O-tosylribonucleosides, and 2'-O-triflylnucleosides, is described. The phosphonothiolation of these compounds was achieved using S-(diisopropylphosphonomethyl)isothiouronium tosylate, a new, odourless, and efficient equivalent of mercaptomethylphosphonate...

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Journal: :Journal of Enzyme Inhibition and Medicinal Chemistry 2017

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