ZfN: Search Results

1	Author	Joachim Pickardt	Requires cookie*
	Title	Metallkomplexe mit Hexamethylentetramin als Ligand: Kristallstruktur des Cadmiumiodid-Addukts 3 Cdl2 * 2 C6H12N4 * 4 H20 Metal Complexes with Hexamethylenetetramine as Ligand: Crystal Structure of the Cadmium Iodide Adduct 3CdI2 * 2C6Hi2N4 * 4H20
	Abstract	The reaction of aqueous solutions of cadmium iodide and hexamethylenetetramine yields crystals of an adduct 3CdI2 • 2CeHi2N4 • 4H20. The crystals are monoclinic, space group P 2i/n, Z = 2, a = 811.5(2), b = 1049.2(4), c = 1849.5(6) pm, ß = 97.73(2)°. The adduct is polymeric and may be regarded as built up from groups of two tetrahedrally and one octahedrally coordinated Cd(II) ions in which the tetrahedra and the octahedron are sharing common iodine atoms at the corners; neighbourirg Cd a units are interlinked by hexamethylenetetramine molecules.
	Reference	Z. Naturforsch. 36b, 1225—1227 (1981); eingegangen am 4. Mai 1981
	Published	1981
	Keywords	Hexamethylenetetramine Complexes, Cadmium Iodide Adduct, Crystal Structure
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	TEI-XML for	default:Reihe_B/36/ZNB-1981-36b-1225.pdf
	Identifier	ZNB-1981-36b-1225
	Volume	36

2	Author	Mit Unterschiedlich, Koordinierten Zinkionen, Joachim Pickardt, Gill-Taik Gong, Sabine Wischnack, Christina Steinkopff	Requires cookie*
	Title	Kristallstruktur zweier Zinkthiocyanat-Hexamethylentetramin-Addukte, Zn(SCN)2» (Q H ^N,), und {Zn(SCN)2 C6HnN4 2H 20}(SCN)2-(C6H 12N4)2, and {Zn(SCN)2-C6H 12N4-2H 20}", with Differently Coordinated Zinc Ions
	Abstract	of the adducts Zn(SCN),-(C6H12N4)2 (1), and {Zn(SCN)2-C6H 12N4-2H20}" (2) were obtained by crystallization from aqueous solutions containing hexamethylenetetrami ne, potassium thiocyanate and zinc nitrate or zinc sulfate, resp., under identical conditions, as two totally different products. 1 crystallizes orthorhombically, space group P nmm, Z -2, a -622.4(5), b -1152.3(7), c = 1394.0(9) pm; 2 is monoclinic, space group C2/c, a = 984.4(3), b = 1217.0(5), c = 1257.4(6) pm, andß = 111.69(5)°. The crystal structure of 1 contains discrete molecules of the complex, in which the zinc ion is tetrahedrally coordinated by two NCS li gands, and two hexamethylenetetramine molecules, which act as monodentate ligands. In 2 however, the zinc ions are octahedrally coordinated. A "supramolecular" structure is form ed: The hexamethylenetetramine molecules act as bridging bidentate ligands and connect [Zn(H20) 2(NCS)2] units forming zig-zag chains. Adjacent chains are interconnected via hydrogen bonds. The formation of the two compounds with different coordination may be due to the fact, that the educts Zn(N03)2-4H20 and ZnS04-7H20 contain Zn(H20) 4 and Zn(H20) 6 moieties, resp., and that these species are retained in solution.
	Reference	Z. Naturforsch. 49b, 325—329 (1994); eingegangen am 24. August 1993
	Published	1994
	Keywords	Hexamethylenetetramine Complexes, Zinc Thiocyanate Adducts, Crystal Structure Crystals
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	TEI-XML for	default:Reihe_B/49/ZNB-1994-49b-0325.pdf
	Identifier	ZNB-1994-49b-0325
	Volume	49