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1999 (2)
1997 (1)
1Author    Teodor Silviu Balabana ', NinaG. FurmanovabRequires cookie*
 Title    7T-7T Interactions between Pyrylium and Phenyl Rings in the Crystal  
 Abstract    The crystal structures of two isomeric phenyl-substituted pyrylium perchlorates, 2,6-di-methyl-4-phenylpyrylium (1) and 2,4-dim ethyl-6-phenylpyrylium (2), have been determined. Both cations are planar in the crystal so that the electron deficient pyrylium rings can interact strongly with the phenyl rings of adjacent molecules forming stacks along the shortest crys-tallographic axis. The phenyl rings may act as donors in a charge transfer interaction which is more pronounced in 1 than in 2. Charge transfer appears as a non-mandatory consequence of the 7T-7T stacking. The structures demonstrate the electrostatic nature of these interactions conforming to the model of Hunter and Sanders [ 1 ]. 
  Reference    Z. Naturforsch. 52b, 485 (1997); received January 13 1997 
  Published    1997 
  Keywords    Pyrylium Salt, Crystal Engineering, Charge Transfer, Crystal Structure 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0485.pdf 
 Identifier    ZNB-1997-52b-0485 
 Volume    52 
2Author    B. Roßenbeck, W. S. SheldrickRequires cookie*
 Title    Three-dimensional Copper(I) Halide Based Coordination Networks with Asymmetrically Substituted Bridging N-Donor Ligands  
 Abstract    The discrete complex [(Cul)2 (pyzCN)4] (1) and the coordination polymers ^ [CuI(pyzCN)] (2) and 3 [(CuX)3 (pyzCN)2] (3, 4; X = Br, Cl) may be prepared from the respective copper(I) halide CuX and 2-cyanopyrazine (pyzCN) by self-assembly in acetonitrile solution at 100-120°C. Whereas 2 exhibits 1 [Cul] staircase double chains as its characteristic substructure, the three-dimensional netwo'rks of 3 and 4 contain single zigzag CuX strings. The influence of the copper(I) halide on both the connectivity pattern and the dimensionality of a resulting coordination network is particularly apparent for the 1:1 complexes ^ [CuI(pymMe)] (5), 3 [(CuBr)3(pymMe)_3] (6) and ^ [CuCl(pymMe)] (7), which were generated by reaction of öaX with 4-methylpyrimidine (pymMe) under reaction conditions similar to those above. 
  Reference    Z. Naturforsch. 54b, 1510—1516 (1999); received August 27 1999 
  Published    1999 
  Keywords    Copper (I) Halides, Coordination Polymers, Crystal Engineering, Pyrazine, Pyrimidine 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1510.pdf 
 Identifier    ZNB-1999-54b-1510 
 Volume    54 
3Author    D. Blaschette, PeterG. JonesRequires cookie*
 Title    Polysulfonylamine, CXVII [1]  
 Abstract    Wasserstoffbrücken in kristallinen Onium-dimesylamiden: Sechs systematisch variierte s££.-Ammonium-dimesylamide mit sechs verschiedenen null-, ein-oder zweidimensionalen Wasserstoffbrückenmustern Polysulfonylamines, C X V II [1] H ydrogen B onding in Crystalline O n iu m Dimesylamides: Six Systematically Varied sec. -A m m onium Dimesylamides Exhibiting Six D ifferent Zero-, One-, or Two-Dimensional Hydrogen B onding Patterns O liver Moers, Karna W ijaya, D agm ar Henschel, A rm a n In order to examine packing preferences and hydrogen bond patterns in secondary ammo­ nium salts, low-temperature X-ray analyses were conducted for six compounds of general formula R^N H ^M eSO ^hN ", where R 2NH2 = Me2NH2 (1, triclinic, space group P I), 
  Reference    Z. Naturforsch. 54b, 1420—1430 (1999); eingegangen am 13. Juli 1999 
  Published    1999 
  Keywords    Di(methanesulfonyl)amide, Secondary Ammonium Cation, Crystal Structure, Hydrogen Bonding, Crystal Engineering 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1420.pdf 
 Identifier    ZNB-1999-54b-1420 
 Volume    54