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The structure of the pyridine complex has been determined crystallographically. [2] Adducts with other N-heterocycles have also been characterized similarly. [3] Aqueous chromium(VI) oxide peroxide decomposes in a few seconds, turning green as chromium(III) compounds are formed. [4] 2 CrO(O 2) 2 + 7 H 2 O 2 + 6 H + → 2 Cr 3+ + 10 H 2 O + 7 O 2
Crystal structures of elements at their melting points at atmospheric pressure 1 H 13 K Mg: 2 He * 3 Li 453 K W: 4 Be 1560 K W: 5 B 2349 K β-B: 6 C 3800 K g-C: 7 N 63 K β-N: 8 O 54 K γ-O: 9 F 53 K γ-O: 10 Ne 24 K Cu: 11 Na 370 K W: 12 Mg 923 K Mg: 13 Al 933 K Cu: 14 Si 1687 K d-C: 15 P 883 K b-P: 16 S 393 K β-S: 17 Cl 171 K Cl: 18 Ar 83 K ...
Two crystalline forms are known, both being very similar to the corresponding potassium sulfate. Orthorhombic β-K 2 CrO 4 is the common form, but it converts to an α-form above 666 °C. [1] These structures are complex, although the chromate ion adopts the typical tetrahedral geometry. [2]
Chromium(III) tends to form octahedral complexes. Commercially available chromium(III) chloride hydrate is the dark green complex [CrCl 2 (H 2 O) 4 ]Cl. Closely related compounds are the pale green [CrCl(H 2 O) 5 ]Cl 2 and violet [Cr(H 2 O) 6 ]Cl 3 .
Form 8-K covers special material events that occur between 10-K and 10-Q filings. A substantial number of firms filed their 10-K as a Form 10-K405 during the late 1990s and early 2000s (decade). A 10-K405 is a 10-K where the Regulation S-K Item 405 box on the cover page is checked. Due to confusion in its application, the 10-K405 was eliminated ...
Spindle-shaped gas vesicles in (A). Isolated cylinder-shaped gas vesicles in (B). (C) Morphogenesis of gas vesicles from a bicone to a spindle- or cylinder-shaped gas vesicle. (D) Groups of gas vesicles. They form clusters during the early stage of gas vesicle formation, and fill the cells later. (E) Detailed diagram of a gas vesicle.
GAMESS (US) can perform several general computational chemistry calculations, including Hartree–Fock method, density functional theory (DFT), generalized valence bond (GVB), and multi-configurational self-consistent field (MCSCF).
ISIS/Draw retained its own proprietary file formats with the extension .skc (sketch file) and .rxn (for reactions) and because of its role in preparing database queries it supported a variety of special atom and bond types used for substructure searching, such as wildcard atoms, aromatic bonds, ring bonds, and the atom mapping required for ...