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'Crown Ether' in keywords Facet   Publication Year 1999  [X]
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1Author    Z. NaturforschRequires cookie*
 Title    U ntersuchungen an Polyhalogeniden, X X X IX  
 Abstract    [1] [(H 30)(1 8 -K r o n e -6)]I7, eine Struktur-Neubestim m ung Studies on Polyhalides, X X X IX [1] S tructure R efinem ent of [(H 30)(1 8 -cro w n -6)]I7 Sawsan A bd El K halika, M ervat El Essaw ia, Ingo D om brow skih, K arl-Friedrich T ebbeb * The structure analysis of the compound [(H30)(18-Krone-6)]I7 has been repeated. The al­ ready known structure could now be described with improved precision. The unique polyiodide chain i [ (I _'2I2) I2] may be derived from the regu­ lar three dimensional iodide-iodine lattice c»[U 3I2] by separation. 
  Reference    Z. Naturforsch. 54b, 136—139 (1999); eingegangen am 6. Oktober 1998 
  Published    1999 
  Keywords    Polyhalogenide, Heptaiodide, Crown Ether, Oxonium Compound, Crystal Structure 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0136_n.pdf 
 Identifier    ZNB-1999-54b-0136_n 
 Volume    54 
2Author    VictorA. Trusha, KonstantinV. Domasevitcha, VladimirM. Amirkhanov2, Joachim SielerbRequires cookie*
 Title    Structure of Tl(18-cr0wn-6){Cl3C C (0)N P (0)(0C H 3)2}: Coordination of the Ionic Multidentate Weakens the Interaction of the Metal Atom with the Crown Ether  
 Abstract    The thallium(I) dimethyl-N-trichloroacetylamidophosphate complex with a 18-crown-6 of the composition Tl(18-crown-6){L} (L = {Cl3CC(0)NP(0)(0 CH3)2}_) has been prepared and characterized by means of IR spectroscopy and X-ray diffraction (orthorhombic, space group P2,2,2, with a = 8.660(1), b = 11.557(2), c =26.296(3) A, Z = 4, V = 2631.8(6) Ä3; R\ = 0.0285 and wR2 = 0.0558 for 4314 unique reflections). It was shown that (L~) is coordinatedoto the central atom in a bidentate manner via oxygen atoms of phosphoryl [Tl-O(l) 2.678(4) A] and carbonyl groups [Tl-0(2) 3.012(6) A], The Tl(18-crown-6)+ moiety adopts a typical "sunrise" coordination with the metal atom laying 1.134(2) A above the mean plane of the oxygen atoms of the macrocycle. This deviation is the highest value of the structurally examined Tl(18-crown-6)+ complexes. The Tl-O (etheric) separations are in the range 2.913(4) -3.198(5) A (av. 3.030(6) A). 
  Reference    Z. Naturforsch. 54b, 451—455 (1999); received September 29 1998 
  Published    1999 
  Keywords    Thallium(I), Crown Ethers, Carbacylamidophosphates, X-Ray Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0451.pdf 
 Identifier    ZNB-1999-54b-0451 
 Volume    54