Results 221 to 230 of about 41,751 (271)

On the reported pyridinium pentachlorothallate(III) and some related compounds

Inorganica Chimica Acta, 1984
Abstract While (C 5 H 6 N) 2 TlCl 5 cannot be prepared in water via the reported procedure it may be obtained in non-aqueous media. Although its low-energy infrared spectrum contains broad peaks and the Raman spectrum is deceptively simple, comparison of these spectra with those of other TlCl 4 − , TlCl 5 3− and TlCl 6 3− derivatives shows that
Mary B. Millikan, Bruce D. James
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Formation of quaternary pyridinium compounds by the action of glutaraldehyde on proteins

Journal of the Chemical Society, Chemical Communications, 1976
1-(5-Amino-5-carboxypentyl)pyridinium chloride hydrochloride (2) has been isolated by acid hydrolysis of the product of the action of glutaraldehyde on ovalbumin, supporting the view that the chromophore with λmax ca. 265 nm formed when glutaraldehyde reacts with proteins is due to the formation of quaternary pyridinium compounds.
Paul M. Hardy, Graham J. Hughes, H. N. Rydon   +2 more
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Ferroelectricity of Inclusion Compounds of Thiourea with Pyridinium Iodide and Nitrate

The Journal of Physical Chemistry C, 2009
The character of phase transitions in the inclusion compounds of thiourea with pyridinium iodide and nitrate has been analyzed, and a model of ferroelectricity of these compounds has been proposed. Analysis of the temperature dependence of specific heat and intensity of the Bragg peaks has shown that the ferro-paraelectric phase transitions are ...
Pajzderska, Aleksandra, Collet, Eric, Czarnecki, Piotr, Wąsicki, Jan   +3 more
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Secondary interactions in the isomorphous compounds 2,6-bis(chloromethyl)pyridinium chloride and 2,6-bis(bromomethyl)pyridinium bromide

Acta Crystallographica Section C Crystal Structure Communications, 2004
The title compounds, C7H8Cl2N+.Cl- and C7H8Br2N+.Br-, are isomorphous. In the crystal packing, layers parallel to the ac plane are formed by a classical N(+)-H...X- hydrogen bond (X = halogen) and two X...X contacts. A third X...X contact links the layers, and a fourth, which is however very long, completes a ladder-like motif of halogen atoms ...
Virginia, Lozano, Peter G, Jones
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Discovery of an intermediate phase in bis-thiourea pyridinium chloride inclusion compound

The Journal of Chemical Physics, 2009
This paper reports the occurrence of a new phase for bis-thiourea pyridinium chloride inclusion compound, which is intermediate to the high- and low-temperature ones already reported. The structure of the intermediate phase was determined by the x-ray diffraction and the following sequence of space groups was obtained: Cmcm⟶237 KCmc21⟶206 KPbca.
Pajzderska, Aleksandra, Wąsicki, Jan, Czarnecki, Piotr, Toupet, Loic, Collet, Eric   +4 more
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ChemInform Abstract: PYRIDINIUM SALTS OF HALOGENATED HETEROCYCLIC COMPOUNDS

Chemischer Informationsdienst, 1975
AbstractPentachlorpyridin (I) ergibt bei 50°C mit überschüssigem Pyridin (II) das Salz (III), das mit Dimethylamin (IV) in Wasser zu dem roten Derivat (V) gespalten wird.
R. D. CHAMBERS, W. K. R. MUSGRAVE, P. G. URBEN   +2 more
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Antiradiation Compounds XIII: 1-(Dithioacetic Acid)-Pyridinium Betaines

Journal of Pharmaceutical Sciences, 1970
Active mono-S-alkyl esters prepared from 1-(dithio-acetic acid)-pyridinium betaine (III) were found to be sufficiently stable for screening as radiation-protective agents, and e-withdrawing substituents in the pyridine ring gave stable betaines. Reaction of the methyl ester of III with phenacyl bromide and alkali resulted in S-alkylation to give a ...
William O. Foye, Young Ja Cho, Kyung Hee Oh   +2 more
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REDUCTION OF PYRIDINIUM AND CARBONYL COMPOUNDS BY REFLUXING SODIUM DITHIONITE SOLUTIONS

Chemistry Letters, 1977
Abstract Sodium dithionite in refluxing MeOH–H2O was found to be an effective reducing agent for converting pyridinium ions to piperidines and carbonyl compounds to alcohols, respectively.
Hiroshi Minato, Shinichi Fujie, Kentaro Okuma, Michio Kobayashi   +3 more
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Electron density distribution in a thiourea pyridinium nitrate inclusion compound

Journal of Molecular Structure, 2006
Abstract The study presented has been focussed on characterization of electron density distribution in a thiourea pyridinium nitrate inclusion system [ ( NH 2 ) 2 CS ] 2 ( C 5 H 5 NH ) + NO 3 − by quantum chemistry (DFT) calculations.
J.N. Latosińska, A. Pajzderska, J. Węsicki   +2 more
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The formation of pyridinium compounds by the reaction of halogens with dipyridine metal dihalides

Journal of Inorganic and Nuclear Chemistry, 1969
Abstract The compounds formed by the reaction of halogens with dipyridine metal halides in ethanol have been characterised. Their far i.r. spectra show them to be ionic pyridinium metal halide salts.
J.H. Mundie, R.H. Nuttall
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