Results 221 to 230 of about 47,136 (264)

1H NMR evidence for the bi-pyridinium nature of the pyridine salt of H3PW12O40

Catalysis Communications, 2005
Pyridinium salts of H3PW12O40 and H3PMo12O40 were investigated by 1H NMR and IR spectroscopies. 1H NMR evidenced the formation of bi-pyridinium cation in the pyridinium salt of H3PW12O40, while a classical pyridinium cation was identified in the ...
Nadine Essayem, Alain Tuel
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Antimycobacterial Activity of Quaternary Pyridinium Salts and Pyridinium N-oxides - Review

Current Pharmaceutical Design, 2012
The treatment of tuberculosis and other mycobacterioses is still a major world health problem and new antimycobacterial compounds unrelated to approved drugs are in demand. Quaternary ammonium salts have revealed many usable properties especially as antimicrobials; they are widely used as disinfection and antiseptic agents.
Martin, Krátký, Jarmila, Vinšová
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Reactivity of Halo(pyridinium)carbenes

The Journal of Organic Chemistry, 2009
The reactivity of chloro- and fluoro(N-methyl-3-pyridinium)carbenes was examined by laser flash photolysis, where the halo(pyridinium)carbenes formed ylides with pyridine, acetonitrile, and acetone. Although the halo(pyridinium)carbenes reacted within the time of the laser pulse, their relative reactivities with a series of alkenes could be obtained ...
Reinaldo, Moya-Barrios, Benjamin M, Fregeau, Frances L, Cozens   +2 more
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The crystal structure of pyridinium dichloroiodide

Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry, 1973
Pyridinium dichloroiodide, CsNH6ICI2, is trigonal, space group R3m, with a=6.165 (4)A, e= 82.45 (6) °, D,,=2.06 g cm -a (by flotation), Z=I, Dc=2"04 g cm -3. The atomic positions have been determined by least-squares refinement of counterintensities, the final R being 0.023 for 227 reflexions.
Tucker, P. A., Kroon, P. A.
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The nature of the reduction product in pyridinium chlorochromate and pyridinium dichromate oxidations

Inorganica Chimica Acta, 1984
Les produits de reduction et d'oxydation du titre sont des composes stœchiometriques respectivement de Cr(IV) et de Cr(V)
Damburu M. Patro, Radhasyam Panda, Akhil K. Panigrahy, Surendra N. Mahapatro   +3 more
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Pyridinium salts

Chemistry of Heterocyclic Compounds, 1974
P. P. Zarin', �. S. Lavrinovich, A. K. Aren   +2 more
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Interactions of pyridinium oximes with acetylcholinesterase

Chemico-Biological Interactions, 2010
Catalytic activity of acetylcholinesterase (AChE; EC 3.1.1.7) was studied in the presence of oximes HI-6, K114, K127 and K203, and inhibition constants were determined for the reversible enzyme-inhibitor complex (K(I)). Based on the mixed inhibition model, inhibition constants were 0.020 mM for HI-6, 0.0021 mM for K114, 0.175 mM for K127, and 0.036 mM ...
Šinko, Goran, Brglez, Josipa, Kovarik, Zrinka   +2 more
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Ferroelectric properties of pyridinium tetrafluoroborate

Physical Review B, 1994
The differential thermal analysis of a single crystal of pyridinium tetrafluoroborate was performed revealing two solid-solid phase transitions at 205 and 240 K. The real part of the dielectric permittivity was measured between 190 and 290 K. The large anomaly at the higher phase transition is interpreted as the Curie point of a new ferroelectric ...
, Czarnecki, , Nawrocik, , Pajak, , Wasicki   +3 more
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Solid solutions of pyridinium halobismuthates

Журнал неорганической химии
Solid solutions of pyridinium bromo-iodobismutates were isolated from aqueous solutions and structurally characterized. The composition of the resulting solid solutions [HPy]BiX4 and [HPy]3Bi2X9 (X = Br, I) was found to depend on the ratios of pyridinium/bismuth and bromine/iodine in the initial solution. The existence of five polymorphic modifications
P. A. Buikin, A. S. Zhavoronkov, A. B. Ilyukhin, V. Yu. Kotov   +3 more
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Pyridinium Salts as Organophosphate Antagonists

2015
By a standard screening in vivo, a series of pyridinium salts were tested for their protective activity against organophosphate poisoning. In order to obtain information about the protective mechanisms, several biochemical properties of these compounds were investigated in vitro, viz., their influence upon the enzymes cholineacetyltransferase and ...
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