Crystal structures orthorhombic

Particle shape depends on grade Crystal structure orthorhombic Oil absorption, g/100 g 8-28... 

Black-brown powder or black-brown, opaque crystal needles, depending on the method of preparation. Very sparingly soluble in HgO and organic solvents. Readily soluble in acids, including CH3COOH, and in ammonia. Decomposes on heating in air into Cu and N 3. Can be easily reduced to white CuN 3 in an aqueous solution of hydrazine. Crystal structure orthorhombic. 

Azure-blue crystalline powder. M.p. (dec.) 220°C d ° 3.88. Insoluble in water. Converts to the green compound in humid air. Soluble in ammonium salt solutions. Crystal structure orthorhombic. 

Highly explosive. Sensitive to shock and heat. The white color changes to gray-violet on heating to 170-180°C. Detonation temperature about 300°C. Crystal structure orthorhombic. Heat of formation +67.3 kcal./mole. 

Colorless to yellow needles. Somewhat soluble in water the solubility increases markedly with temperature (15°C) 0.28, (60°C) 1.38 g./lOO g. HsO. Soluble in excess nitrites, with formation of complex salts. Blackens in light. Decomposes at 140°C dissociates into Ag and NO3 on dry heating. In aqueous solution, gradually decomposes into Ag, AgNO 3 and NO. d4 4.453. Crystal structure orthorhombic. Heat of formation —11.6 kcal./mole. 

Colorless crystals, needle-shaped and tabular. Solubility in HgO decreases with increasing temperature can be recrystallized only from solutions containing phosphoric acid. Soluble in dilute acids and dilute ammonia. Loses twomoles of HgO at 100°C, a third mole at 190°C the anhydrous salt is obtained at about 250°C. d 3.109. Hardness 2-3. Crystal structure orthorhombic. 

II. Black, needle-shaped crystals, sparingly soluble in water, d (pycn.) 9.01. Crystal structure orthorhombic, space group... 

Formula weight 181.9. Red to orange-yellow powder. M.p. 674°C. Slightly soluble in water 0.07 g./lOO g. H3O d 3.36. Readily soluble in alkali hydroxide solutions, acids and ethanol. Crystal structure orthorhombic. 

M2(W04)3 tungstate with trivalent cations has two crystal structures, orthorhombic Sc2(W04)3-type and monoclinic Eu2(W04)3-type, depending on the trivalent cation size. The Sc2(W04)3-type structure is quasi-layered with sufficient space between the layers for the smooth migration of ions. In this structure,... 

Crystal structure orthorhombic Micropore volume, cmVg 9.4... 

Crystal structure orthorhombic, rhombohedral, cubic (when solid) orthorhombic, monoclinic hexagonal hexagonal cubic, rhombohedral... 

In polymer crystallization studies, NMR can be used to obtain information related to structure, chain relaxation, and crystallinity [82-84]. For example, two types of crystal structure, orthorhombic and monoclinic, are available in PE. The orthorhombic crystal structure is formed under normal conditions, while the monoclinic crystal structure can be formed under high pressure, deformed conditions, or in copolymers under normal crystallization conditions. 

According to investigations [215], the structure of Marignac s salt corresponds to the formula K2Ta203F6. The compound crystallizes in orthorhombic syngony, with a space group of Pnma - D, Z = 4. 

Three forms of titanium dioxide, Ti02, are known. Of these the crystal structures of the two tetragonal forms, rutile and anatase, have been thoroughly investigated2) in each case only one parameter is involved, and the atomic arrangement has been accurately determined. The third form, brookite, is orthorhombic, with axial ratios... 

Two helices are packed antiparallel in the orthorhombic unit cell. Association of the helices occurs through a series of periodic carboxylate potassium water - carboxylate interactions. An axial projection of the unit-cell contents (Fig. 23b) shows that the helices and guest molecules are closely packed. This is the first crystal structure of a polysaccharide in which all the guest molecules in the unit cell, consistent with the measured fiber density, have been experimentally located from difference electron-density maps. The final / -value is 0.26 for 54 reflections, of which 43 are observed, and it is based on normal scattering factors.15... 

In spite of the alteration due to deacetylation, chitosan from crab tendon possesses a crystal structure showing an orthorhombic unit cell with dimensions a = 0.828, b = 0.862 and c = 1.043 nm (fiber axis). The unit cell comprises four glucosamine units two chains pass through the unit cell with an antiparallel packing arrangement. The main hydrogen bonds are 03 05 (intramolecular) and N2 06 (intermolecular) [82]. This material has also found medical uses (below). 

Crystal Structure and Lattice Parameters (nm) Orthorhombic, a = 0.283, b = 0.554, c = 1.1470 Cr3C2 is an intermediate carbide having carbon chains with C-C distance approximately 0.165 nm running through distorted metal lattice where the Cr atoms are at the corners of trigonal prisms and the carbon atoms in the center of the prisms.i li" ... 

Cyc/o-Undecasulfur Su was first prepared in 1982 and vibrational spectra served to identify this orthorhombic allotrope as a new phase of elemental sulfur [160]. Later, the molecular and crystal structures were determined by X-ray diffraction [161, 162]. The Sn molecules are of C2 symmetry but occupy sites of Cl symmetry. The vibrational spectra show signals for the SS stretching modes between 410 and 480 cm and the bending, torsion and lattice vibrations below 290 cm [160, 162]. For a detailed list of wavenumbers, see [160]. The vibrational spectra of solid Sn are shown in Fig. 23. 

Seiler P, Dunitz JD (1982) Low-temperature crystallization of orthorhombic ferrocene structure analysis at 98 K. Acta Crystallogr B 38 1741-1745... 

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