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1980 (1)
1Author    K. K. Chacko, W. SaengerRequires cookie*
 Title    Crystal and Molecular Structure of l,ll-bis(Tropolone)-3,6,9-trioxaundecane * Rbl a  
 Abstract    The complex between the polyether ligand l,ll-bis(tropolone)-3,6,9-trioxaundecane and Rbl crystallizes in space group P2i/c with cell dimensions a — 11.383(4), b = 14.493(5), c = 16.122(6) A and ß = 111.02(5)° with Z = 4. The structure was solved on the basis of 3734 X-ray reflections measured on a diffractometer with CuKa-radiation and refined to an R of 0.101. The polyether wraps around the Rb + in a circular structure. One of the tropolone rings is elevated in order to avoid collision. Rb + is located 1.224(6) A above the plane formed by five oxygen atoms of the ligand, it is coordinated to I -(3.666(2)Ä) and to all oxygens. The Rb+ • • • O distances of the least electronegative "ester oxygens", 3.14(1) A and 3.18(1) A are significantly longer compared to the other Rb+---0 distances in the range 2.81(1) A to 3.08(1) A. The conformation about the C-C and C-0 bonds of the ligand are gauche and trans as generally found in such molecules. The two tropolone seven-membered rings are slightly non-planar and display an envelope-type structure. 
  Reference    Z. Naturforsch. 35b, 1533—1537 (1980); received August 7 1980 
  Published    1980 
  Keywords    Polyether, Tropolone, Rbl Complex, X-ray 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1533.pdf 
 Identifier    ZNB-1980-35b-1533 
 Volume    35