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'Pentaazadienide A nion' in keywords Facet   section ZfN Section B  [X]
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1993 (1)
1Author    Herrn Prof, DrRequires cookie*
 Title    Zur Struktur des Pentaazadienidions [tol-N =N -N -N =N -tol]  
 Abstract    _. Synthese und Kristallstruktur von Cs2(18-Krone-6)(tolN5tol)2 und (NH4)[Cr(NH3)6(H20) 4](tolN5tol)4 T h e S tru c tu re o f th e P e n ta a z a d ie n id e A n io n [ to l-N = N -N -N = N -to l] _. S yn th esis a n d C ry sta l S tru c tu re o f C s2(1 8 -C ro w n -6)(to lN 5to l)2 an d (N H 4)[C r(N H 3)6(H 20) 4] (to lN 5to l)4 S u san n e D ie te ric h , Jo a c h im S träh le* A concentrated solution of CsCl, 18-crown-6, and to l-N = N -N (H)-N = N -to l in aqueous am m onia affords Cs2(18-crown-6)(tolN5tol)2, which crystallizes in the triclinic space group P 1 with a = 852.6(2), b = 1139.4(3), c -1373.9(4) pm, a = 104.17(3),ß = 95.94(2), y = 110.74(2)°, Z = 1. In the structure centrosym m etrical [Cs2(18-crown-6)]2+ moieties are packed with pairs of l,5-bis(tolyl)pentaazadienide anions to built up columns along [100]. The N -N distances N 1 -N 2 = 128 pm and N 4 -N 5 = 129 pm in the pentaazadienide anions indicate localized double bonds, while the distances N 2 -N 3 and N 3 -N 4 of 134 pm can be assigned to single bonds. A m ixture of C r(N H 3)^+ and tolN N N (H)N N tol in concentrated aqueous am monia yields triclinic (N H 4)[C r(N H 3)6(H 20) 4](tolN 5tol)4 crystallizing in the space group P 1 with the lattice param eters a = 1561.1(1), b = 1619.3(3), c = 1703.3(2) pm, a = 107.03(1), ß = 116.81(1), y = 101.75(1)°, Z = 2. The structure contains tolN5toh anions, NH^ cations and [C r(N H 3)6(H 2Ö)4]3+ complexes in which four triangular faces of the Cr(N H 3)6 octahedron are capped by w ater molecules which are linked via hydrogen bonds. Within the pentaazadienide anions which are connected with the [Cr(N H 3)6(H 20) 4]3+ complexes also via hydrogen bonds an indication for localized double bonds N 1=N2 and N 4=N 5 has been obtained. 
  Reference    Z. Naturforsch. 48b, 1574—1580 (1993); eingegangen am 26. Juli 1993 
  Published    1993 
  Keywords    Pentaazadienide A nion, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-1574.pdf 
 Identifier    ZNB-1993-48b-1574 
 Volume    48