Go toArchive
Browse byFacets
Bookbag ( 0 )
'Crystal Structures' in keywords Facet   section ZfN Section B  [X]
Facet   Publication Year 1999  [X]
Results  64 Items
Sorted by   
Publication Year
61Author    A. Baumann, J. Beck, T. HilbertRequires cookie*
 Title    Octachalcogen Cations Te82+, Se82+, and Mixed (Te8.JC SeJC )82+ Stabilized by Chlorometallates of Bi, Zr, and Hf: Synthesis and Crystal Structures of Se8[Bi4Cli4] and E8[MC16] (E = Se, Te; M = Zr, Hf)  
 Abstract    The title compounds were obtained by the reaction of elemental chalcogens E (E = Se, Te) with the respective tetrachlorides ECU and the Lewis acidic metal halides ZrCL, HfCU, and BiCfi. An alternative way, particularly for the preparation of mixed Se/Te-species, is the enlargement of smaller cationic rings in E4MC16] (M = Zr, Hf) by adding the respec­ tive complementary chalcogen. All reactions were carried out in sealed, evacuated glass am­ poules at temperatures between 120 °C and 220 °C, and yielded black crystals of SegfBijClu], (Te5.oSe3.o)[HfCl6], (Te5.3Se2.7)[ZrCl6], (Teft.sSei.sMZrCU] and Te8[HfCl6], which have been identified by crystal structure analyses. All five compounds contain eight-membered chalcogen rings in an endo-exo-conformation which are isostructural to the known octachalcogen dica­ tions E82+ (E = S, Se, Te). While in (Te5.0Se3.o)[HfCl6], (Te5.3Se2.7)[ZrCl6], (Te6.5Se,.5)[ZrCl6 _] and TesfHfClft] the molecular polycations are surrounded by discrete, octahedral [MClö]"-counterions, Se4 [Bi4CZT14] contains a two-dimensional polymeric anion ([Bi-jCl^ ] 2)" built of a variety of vertex and edge-sharing BiClv-polyhedra (x = 6 , 7). The Bi-Cl bond lengths are spread over a wide range between 250 and 350 pm. 
  Reference    Z. Naturforsch. 54b, 1253—1259 (1999); received July 15 1999 
  Published    1999 
  Keywords    Octaselenium(2+), Octatellurium(2+), Chalcogen Polycations, Halogenobismutates(III), Crystal Structure 
  Similar Items    Find
 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1253.pdf 
 Identifier    ZNB-1999-54b-1253 
 Volume    54 
62Author    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 
  Similar Items    Find
 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1420.pdf 
 Identifier    ZNB-1999-54b-1420 
 Volume    54 
63Author    Dagmar Henschel, Oliver Moers, Karna Wijaya, Blaschette Arm, PeterG. JonesRequires cookie*
 Title    Wasserstoffbrücken in kristallinen Onium-dimesylamiden: Drei prim. -Ammonium-dimesylamide mit zwei-oder dreidimensionalen Wasserstoffbrückenmustern Polysulfonylamines, CXVIII [1] Hydrogen Bonding in Crystalline Onium Dimesylamides: Three prim. -Ammonium Dimesylamides Exhibiting Two-or Three-Dimensional Hydrogen Bond Patterns  
 Abstract    In order to study hydrogen bonding patterns in primary ammonium salts and the hydrogen bond acceptor potential of the dimesylamide anion, low-temperature X-ray structures have been determ ined for the 1:1 salts R N H ^M eSC ^^N -, where R = Et (1, monoclinic, space 
  Reference    Z. Naturforsch. 54b, 1431—1440 (1999); eingegangen am 13. Juli 1999 
  Published    1999 
  Keywords    Di(methanesulfonyl)amide, Primary Ammonium Cation, Crystal Structure, Hydrogen Bonding, Ionic Self-Clathrate 
  Similar Items    Find
 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1431.pdf 
 Identifier    ZNB-1999-54b-1431 
 Volume    54 
64Author    K. Am, Wijaya, Oliver Moers, A. Rm, Blaschette, PeterG. JonesRequires cookie*
 Title    Wasserstoffbrücken in kristallinen Onium-dimesylamiden: Ein antidromes Achtringmuster als robustes supramolekulares Synthon - Drei prototypische Strukturen Polysulfonylamines, CXIX [1, 2] Hydrogen Bonding in Crystalline Onium Dimesylamides: An Antidromic Eight-M embered Ring Pattern as a Robust Supramolecular Synthon - Three Prototypical Structures  
 Abstract    Syntheses and low-temperature X-ray structures are reported for three ionic solids of gen­ eral formula BH +(M eS 0 2)2N_, where B H + is 3,4,6,7,8,9-hexahydro-2//-pyrimido[l,2-tf]pyri-midinium (1, monoclinic, space group P 2 1/c), N,N'-diphenylformamidinium (2, monoclinic, P2xlc), or 2-phenylaminopyridinium (3, triclinic, P I, two independent formula units). As a common feature, the onium cations in question exhibit a difunctional hydrogen-bond donor sequence H -N -C (s p 2) -N -H geometrically complementary to an O -S -N fragment of the anion. Consequently, the three crystal packings consist of discrete cation-anion pairs (for­ mula units) assembled by an N -H --N and an N -H ---0 hydrogen bond. In both independ­ ent ion pairs of 3, the N -H ---N bond originates from the pyridinium centre and the N-H-O bond from the amino group. The eight-membered ring [graph set N2 = R2(8), antidromic] that results in all these prototypical structures has potential as a new and robust supramolecular synthon. In each case, short C-H-O contacts with H -O < 260pm and C-H-O ^ 140° are present; in 2, two Car-H ---0 hydrogen bonds are assisted by a C(formyl)-H -O contact and a n -n interaction to create a centrosymmetric formula unit dimer. 
  Reference    Z. Naturforsch. 54b, 1441—1449 (1999); eingegangen am 13. Juli 1999 
  Published    1999 
  Keywords    Di(methanesulfonyl)amide, Onium Cation, Crystal Structure, Hydrogen Bonding, Molecular Recognition, Supramolecular Synthon 
  Similar Items    Find
 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1441.pdf 
 Identifier    ZNB-1999-54b-1441 
 Volume    54