Ammonium iron(III) phosphate(V) fluoride, (NH4)0.5[(NH4)0.375K0.125]FePO4F, with ammonium partially substituted by potassium

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Ammonium iron(III) phosphate(V) fluoride, (NH4)0.5[(NH4)0.375K0.125]FePO4F, with ammonium partially substituted by potassium

The title compound, ammonium potassium iron(III) phosphate fluoride, (NH(4))(0.875)K(0.125)FePO(4)F, is built from zigzag chains (∞) (1){[FeO(4)F(2)](7-)}, with Fe(3+) in a distorted octahedral coordination, extending along both the [011] and [01] directions. These chains are made up of alternating trans-[FeO(4)F(2)] and cis-[FeO(4)F(2)] octa-hedra via shared F-atom corners, and are linked by P...

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Acceleration of the Rate of Reaction of Dimethylcarbamyl Fluoride and Acetylcholinesterase by Substituted Ammonium Ions.

The inhibition of acetylcholinesterase and other hydrolytic enzymes by methanesulfonyl fluoride, other sulfonyl fluorides, and anhydrides of methanesulfonic acid has been studied by several workers (2-5). Certain alkyl ammonium ions greatly increase the rate of irreversible inhibition of acetylcholinesterase by methanesulfonyl fluoride (6). The inhibition arises from the formation of a specific...

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Acceleration of the rate of reaction of methanesulfonyl fluoride and acetylcholinesterase by substituted ammonium ions.

Methanesulfonyl fluoride is an oxydiaphoric (acid-transferring) inhibitor of acetylcholinesterase. It reacts with the enzyme to produce a methanesulfonyl enzyme derivative. The group in the enzyme that is sulfonylated lies near the anionic site and is possibly the same group that is acetylated during the normal catalytic activity of the enzyme, i.e. the basic group of the esteratic site (1, 2)....

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Synthesis of Ammonium Dinitramide by Nitration of Potassium and Ammonium Sulfamate. The Effect of Sulfamate Conterion on ADN Purity

Nitration of potassium sulphamate was carried out using a mixture of sulphuric and nitric acid at -30 °C. The reaction time was optimized at the mole ratio of sulphuric to nitric acid of (1:3.5). The difference in product yield by changing the potassium to ammonium sulphamate was studied throughly. It was found that both the yield and purity of the product is better starting with potassium ...

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Ammonium Toxicity and Potassium Limitation in Yeast

DNA microarray analysis of gene expression in steady-state chemostat cultures limited for potassium revealed a surprising connection between potassium and ammonium: potassium limits growth only when ammonium is the nitrogen source. Under potassium limitation, ammonium appears to be toxic for Saccharomyces cerevisiae. This ammonium toxicity, which appears to occur by leakage of ammonium through ...

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ژورنال

عنوان ژورنال: Acta Crystallographica Section E Structure Reports Online

سال: 2008

ISSN: 1600-5368

DOI: 10.1107/s1600536808042499