Thin Layer Precipitation Chromatography with Silver Nitrate. I. Separation and Detection of I-, Br-, Cl- and PO43-

Separation of the coproporphyrin isomers I and III by thin layer chromatography.

An improved, specific and sensitive method for the determination of the coproporphyrin isomers I and III is described. In this method, the hydrolysis of the coproporphyrin methyl esters takes place in the silica gel layer of acid-resistant pre-coated thin layer plates. After chromatography in the solvent system 2,6-dimethylpyridine/water, (volume ratio 20 ml + 6 ml), in an ammonia atmosphere, t...

Bis(dicyclo­hexyl­phenyl­phosphine)silver(I) nitrate

The title compound, [Ag(C(18)H(27)P)(2)]NO(3), is a mononuclear salt species in which the Ag atom is coordinated by two phosphine ligands, forming a cation, with the nitrate as the counter-anion, weakly inter-acting with the Ag atom, resulting in Ag⋯O distances of 2.602 (6) and 2.679 (6) Å. The cationic silver-phosphine complex has a non-linear geometry in which the P-Ag-P angle is 154.662 (19)...

Separation of Cholesterol and Demosterol by Thin-layer Chromatography.

architecture and engineering of nanoscale sculptured thin films and determination of their properties

چکیده ندارد.

Topological characterization of HXO2 (X = Cl, Br, I) isomerization.

The isomerization reactions of HOOX --> HOXO --> HXO2 (X = Cl, Br, I) have been studied by using the density functional theory. The breakage and formation of the chemical bonds of the titled reactions have been discussed by the topological analysis method of electronic density. The calculated results show that there is a transitional structure of a three-membered ring on each of the isomerizati...