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'Crown Ether' in keywords Facet   Publication Year 2001  [X]
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2001[X]
1Author    Markus Ströbele, H.-Jtirgen MeyerRequires cookie*
 Title    Synthesen  
 Abstract    , Kristallstrukturen und magnetische Eigenschaften von [Li(12-Krone-4)2][Li(12-Krone-4)(OH2)]2[Nb6Cl18], [Li(15-Krone-5)2(OH2)]3[Nb6Cl18] und [(18-Krone-6)2(0 2H5)]3[Nb6Cl18] Syntheses, Crystal Structures and Magnetic Behaviour of [Li(12-crown-4)2 ] [Li(12-crown-4)OH2 ]2 [Nb6Cl x8], [Li(15-crown-5)2(OH2)]3[Nb6C l18], and [(18-crown-6)2(0 2H5)]3[Nb6C l18] The title compounds were prepared through reactions of Li2Nb6Cl16 with the corresponding crown ethers in acetone. All three compounds were obtained as dark brown crystals. Their structures were solved with the means of single-crystal X-ray diffraction. [Li(12-crown-4),][Li(12-crown-4)(OHi)]2 [Nb6Cl 18]: space group P 2 ,In, Z =2, a = 1320.4(1), b = 1879.1(1), c = 1321.7(1) pm, ß = 92.515(6)°, P, = 0.0297 (I>2a(I)). The crystal structure contains Li+ sandwiched by two 12-crown-4-ethers plus Li+ coordinated by one 12-crown-4-ether and one water molecule. [Li(15-crown-5)2(OH2)]3[Nb6C l|8]: space group R3, Z = 3, a = b = 2081.7(1), c = 1991.7(1) pm, R\ = 0.0395 (/ > 2<r(/)). In the crystal structure Li+ and one water molecule are sandwiched by two 15-crown-5-ethers. [(18-crown-6)2(0 2H5)]3[Nb6Cl18]: space group P i, Z = 1 ,a = 1405.1(1),/?= 1461.1(2), c = 1492.2(2) pm; a = 98.80(1)°, ß = 98.15(1)°, 7 = 97.41(1)°, P, = 0.0538 (/ > 2a(I)). H5 0 2+ was found in the structure refinement sandwiched between two 18-crown-6-ethers. All compounds reported contain [Nb6Cl18] clusters with Nb-Nb distances between 299 and 301 pm. The paramagnetic behaviour expected for [Nb6C l|8]3~ in all three compounds was confirmed by magnetic measurements. 
  Reference    Z. Naturforsch. 56b, 1025—1034 (2001); eingegangen am 5. Juli 2001 
  Published    2001 
  Keywords    Niobium Cluster, Chloride, Crown Ether 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-1025.pdf 
 Identifier    ZNB-2001-56b-1025 
 Volume    56