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Ammonium Iodide (ammonium + iodide)

Distribution by Scientific Domains

Chemistry	100%

Selected Abstracts

EuI2, a low-temperature europium(II) iodide phase

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 10 2009
Michael Krings
Light-yellow europium(II) diiodide, prepared by the low-temperature reaction of europium and ammonium iodide in liquid ammonia at 200,K and characterized by high-resolution X-ray powder diffraction, represents a new phase for EuI2 that adopts an orthorhombic Pnma structure with all three atoms lying on 4c positions (.m.). It is isotypic with SrI2(IV). Temperature-dependent X-ray measurements performed to investigate the thermal stability of the new phase show that it decomposes irreversibly to amorphous material around 673,K. Total-energy density-functional calculations using the generalized gradient approximation suggest this to be the ground-state structure of EuI2. [source]

Trimethyl[3-methyl-1-(o -tolenesulfonyl)indol-2-ylmethyl]ammonium iodide and benzyl[3-bromo-1-(phenylsulfonyl)indol-2-ylmethyl]tolylamine

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 12 2002
P. R. Seshadri
The title compounds, C20H25N2O2S+·I,, (I), and C29H25BrN2O2S, (II), respectively, both crystallize in space group P. The pyrrole ring subtends an angle with the sulfonyl group of 33.6° in (I) and 21.5° in (II). The phenyl ring of the sulfonyl substituent makes a dihedral angle with the best plane of the indole moiety of 81.6° in (I) and 67.2° in (II). The lengthening or shortening of the C,N bond distances in both compounds is due to the electron-withdrawing character of the phenylsulfonyl group. The S atoms are in distorted tetrahedral configurations. The molecular structures are stabilized by C,H,O and C,H,I interactions in (I), and by C,H,O and C,H,N interactions in (II). [source]

Crystallization and preliminary X-ray diffraction analysis of rat autotaxin

ACTA CRYSTALLOGRAPHICA SECTION F (ELECTRONIC), Issue 9 2010
Jacqueline E. Day
Rat autotaxin has been cloned, expressed, purified to homogeneity and crystallized via hanging-drop vapour diffusion using PEG 3350 as precipitant and ammonium iodide and sodium thiocyanate as salts. The crystals diffracted to a maximum resolution of 2.05,Å and belonged to space group P1, with unit-cell parameters a = 53.8, b = 63.3, c = 70.5,Å, , = 98.8, , = 106.2, , = 99.8°. Preliminary X-ray diffraction analysis indicated the presence of one molecule per asymmetric unit, with a solvent content of 47%. [source]

Determination of non-steroidal estrogens in breast milk, plasma, urine and hair by gas chromatography/mass spectrometry

RAPID COMMUNICATIONS IN MASS SPECTROMETRY, Issue 24 2002
Man Ho Choi
It is suspected that all the natural estrogens occurring in the human body, as well as dietary and synthetic estrogens, diversely affect the endocrine system depending on their exposure patterns. More rapid, reliable and accurate measurements of these compounds in various biological matrices are thus becoming an important task. After solid-phase extraction using an Oasis HLB extraction cartridge, the estrogen concentrates were derivatized with a mixture of N -methyl- N -trifluorotrimethylsilylacetamide/ammonium iodide/dithioerythritol (1000:4:5, v/w/w) for analysis by gas chromatography/mass spectrometry in the selected ion-monitoring (SIM) mode. The qualitative identification of estrogens detected in SIM mode was further confirmed by tandem mass spectrometry using low-energy collision-induced dissociation (CID) mode. The method for the assay of the 20 estrogens was linear over the ranges of 1,1000,µg/L for biological fluids and 1,200,µg/kg for hair with high correlation coefficient (>0.99). The limits of quantitation (LOQ) ranged from 1.0,10,µg/L (or,µg/kg) and the limit of detection ranged from 0.2,3,µg/L (or,µg/kg). The average precision (% CV) and accuracy (% bias) of the method determined at the LOQ, low, and medium concentrations were in the ranges 2.6,9.2 and ,4.1,7.7, respectively. The average extraction recovery of the estrogens from plasma and hair at the three concentration levels varied in the ranges 77,103% (1.9,14.3% CV) and 73,104% (3.1,14%), respectively. The distribution patterns of the estrogens were characteristic of each biosample. Five estrogens in the range 1.5,44.9,µg/L were measured in breast milk, 8 estrogens in the range 3.5,322,µg/L in plasma, 12 estrogens at 1.2,442,µg/L in urine, and biochanin-A at 13.2,39.1,µg/kg in hair. Because of its high sensitivity, good precision and specificity, the present method was found suitable for the trace analysis of dietary and synthetic estrogens in complex biosamples such as breast milk, plasma, urine and hair. Copyright © 2002 John Wiley & Sons, Ltd. [source]