The Crystal Structure of Di-pyridino-mercuric Chloride

Di-pyridino-mercuric chloride HgCl2 . 2CsHsN crystallizes in the space group C 5/2h - P2 1/a with the cell dimensions: a = 17.70A b = 8.62A c = 3.90A B = 93 with two formula units in the cell. The structure was solved by means of the two-dimensional [001] Fourier-Bragg projection. Each mercury atom is surrounded by two nearer chlorine atoms at a distance of 2.34 A, two farther chlorine atoms at a distance of 3.25 A and two nitrogen atoms at a distance of 2.60 A in a deformed octahedral coordination

The Crystal Structure of Mercuric Oxychloride: 2HgCl2 ∙ HgO

The single crystals of the compound 2HgCl2 . HgO were studied by the use of the X-ray methods. The dimensions of the unit cell quoted in the literature were confirmed. The crystals are cubic, the space group being T4-P213. The twodimensional Patterson synthesis allowed the preliminary x, y coordinates of mercury atoms to be determined. The complete X-ray analysis of this compound as well as of the other mercury oxyhalides is in progress

The Crystal and Molecular Structure of Phthalyl-Urea

Using the methods of X-ray analysis we have shown that phthalyl-urea has the structure given by the formula (I). Thus we have confirmed the result previously obtained by V. Hah

Another Way for the Laboratory Preparation ofAnhydrous Chromium(III) Chloride

Two methods for the laboratory preparation of anhydrous chromium(III) chloride are described in the standard handbooks of inorganic syntheses, i. e. (i) the chromium metal is heated in a porcelain tube in a stream of chlorine at high temperature, (ii) the green aqua-chloride [CrCl2 (H2 0)4 ]Cl · 2H20 is heated and the resulting mass of oxide and basic chloride is then chlorinated with carbon tetrachloride

The Crystal Structure of Thorium (IV) Acetylacetonate (A Preliminary x-Ray Examination)

Little is known about the stereochemistry of metal complexes having the coordination number of eight. There are only a few structures of eight coordinated metal complexes hitherto determined with the use of x-ray methods. The square Archimedean antiprism and trigonal dodecahedron were established as the coordination polihedra for (TaF8) 3- and [Mo(CN) 8 ] 4- respectively

On the Tris-methylmercury-oxonium Compounds

The preparation and properties of tris-methylmercury-oxonium fluoborate (CH3Hg)3OBF4 are described. A method for the preparation of methylmercury oxide (CH3Hg)2O by dehydration of methylmercury hydroxide is given. The crystals of tris-methylmercury-oxonium fluoborite have a trigonal symmetry, the hexagonal cell being a = 23.85 A, c = 10.72 A, z = 18. The Patterson synthesis along the c-axis was computed