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'18 Crown 6' in keywords
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1999 (1)
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1Author    JuliaA. Rusanova3, PhilipJ. Squattritob, KonstantinV. Domasevitcha, Volodimirn KokozayaRequires cookie*
 Title    Structure of a Cs(18-crown-6)N(CN)2*H20 Complex: Assembly of the Dimeric 2:2 Anion Paired Encapsulate by Means of jz2-Bridging Water Molecules  
 Abstract    The new macrocyclic complex of composition Cs(18-crown-6)N(CN)2-H20 has been pre­ 
  Reference    Z. Naturforsch. 54b, 389—393 (1999); received October 23 1998 
  Published    1999 
  Keywords    18-Crown-6, Caesium Macrocyclic Complexes, Dicyanamide, Crystal Structure 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0389.pdf 
 Identifier    ZNB-1999-54b-0389 
 Volume    54 
2Author    JuliaA. Manskaya, VolodimirN. Kokozay, KonstantinV. DomasevitchRequires cookie*
 Title    Crystal Structure of an Ammonium Dithiocyanatocuprate(I) Complex with 18-Crown-6, [NH4(18-Crown-6){Cu(NCS)2}] Obtained from Zero Valent Metal  
 Abstract    The new macrocyclic dithiocyanatocuprate(I) complex [NH4(18-crown-6){Cu(NCS)2}] has been prepared using a direct method of interaction and characterized by X-ray crystallogra­ phy (orthorhombic, space group Cmc2i, with a = 12.453(2), b = 21.650(4), c = 8.151(2) A, V = 2197.6(8) Ä3, Z = 4 , 1 (F) = 0.054; wR2(F2) = 0.141 for 972 unique reflections with I > 2<r(I) and /?1(F) = 0.082; w/?2(F2) = 0.210 for all 1098 unique reflections). The lattice comprises complex cations [NH4(18-crown-6)]+ and infinite polymeric anions [Cu(NCS)2]-of a one-dimensional zig-zag structure. The copper atoms adopt three-fold coordination [CuN^S] (Cu-N 1,89(1), 1,90(1) A; Cu-S 2.278(4) A). 
  Reference    Z. Naturforsch. 52b, 1311—1314 (1997); received 
  Published    1997 
  Keywords    18-Crown-6, Copper(I), Thiocyanate, Synthesis, X-Ray 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-1311.pdf 
 Identifier    ZNB-1997-52b-1311 
 Volume    52 
3Author    JuliaA. Manskayaa, KonstantinV. Domasevitcha ', VeraV. Ponomareva2, Joachim Sielerb, VolodimirN. Kokozay2Requires cookie*
 Title    Crystal Engineering towards Design of Macrocyclic Coordination Compounds: Crystal Structure of Rubidium Tetrachloro-and Tetracyanoaurate(III) Complexes with 18-Crown-6  
 Abstract    The new macrocyclic complexes of composition Rb(18-crown-6)AuX4 (X = Cl (1) and CN (2)) have been prepared and characterized by X-ray crystallography (1: monoclinic, space group P2\/n, with a = 8.747(1), b = 8.366(1), c = 15.404(1) Ä; ß = 104.37(1)°, V = 1092.0(3) A , Z = 2; final R 1 =0.025 for 2030 independent reflections used; 2: monoclinic, space group P2\/c, with a = 14.765(3), 6 = 17.134(3), c = 8.855(2) k \ ß = 90.20(1)°, V = 2240.2(8) Ä3, Z = 4; final R 1 = 0.080 for 2034 independent reflections used). Both structures consist of Rb(18-crown-6)+ cations (A) and complex aurate(III) anions AuX4_ (B). Complex 1 has a linear polymeric array -A-B-A-B-(Rb-Cl 3.604(3), 3.654(3) Ä) with the rubidium ions disordered 0.276(2) A above and below the crown ether plane (Rb-O 2.819(5)-2.884(5) A, av. 2.846(5) A). The positioning of the rubidium atom away from the center of the 18-crown-6 is effected by the packing of the Rb(18-crown-6)+ and AuCU-moieties, and by the resemblance in the charge and symmetry of the cationic and anionic parts of the structure. Complex 2 has a zig-zag polymeric array -A-B-A-B-(Rb-N 2.92(2), 2.94(1) A) with orthogonal disposition of Rb(18-crown-6)+ and Au(CN)4-planes. The rubidium atom is situated 0.90(2) A above the mean plane of the macrocyclic oxygen atoms (Rb-O 2.93(5)-3.15(4) A) and adopts a typical "sunrise coordination". 
  Reference    Z. Naturforsch. 53b, 683—688 (1998); received January 5 1998 
  Published    1998 
  Keywords    18-Crown-6, Rubidium Macrocyclic Complexes, Gold(III), Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0683.pdf 
 Identifier    ZNB-1998-53b-0683 
 Volume    53 
4Author    Kumiko Ohtsu, Kazuhiko Ozutsumi, Makoto Kurihara, Takuji KawashimaRequires cookie*
 Title    Thermodynamics of Complexation of Sodium Ion with 12-Crown-4 and 18-Crown-6 in Pyridine  
 Abstract    The complexation of sodium ion with 1,4,7,10-tetraoxacyclododecane (12-crown-4) and 1,4,7,10,13,16-hexaoxacyclooctadecane (18-crown-6) has been studied by titration calorimetry in pyridine (P Y) containing 0.1 mol dm-3 (C2H5)4NC 104 as a constant ionic medium at 25 °C. The calorimetric titration data were well explained in terms of the formation of the [Na(12-crown-4)]+, [Na(12-crown-4)2]+, and [Na(18-crown-6)]+ complexes, and their formation constants, reaction enthalpies, and entropies were determined. The formation of [Na(18-crown-6)]+ is much pronounced in PY over yV,7V-dimethylformamide (D M F) and water, and the stability order is PY > DMF > water. The enthalpy values for the formation of [Na(18-crown-6)]+ are all negative in PY, DMF, and water, and increase in the order PY < DMF < water. The complexation is the least exothermic in water, though sodium ion is the most weakly solvated in water. This is because 18-crown-6 is much stabilized in water by forming hydrogen bonds with water molecules. Despite the stronger electron pair-donat­ ing ability of PY than DMF, the complexation is more exothermic in PY than in DMF. This is ascribed to the different solvation number of the sodium ion in P Y and DMF, i.e., the sodium ion is coordinated with a smaller number of solvent molecules in the former solvent than in the latter. 
  Reference    Z. Naturforsch. 50b, 529—535 (1995); received September 12 1994 
  Published    1995 
  Keywords    Thermodynamics of Complexation, Sodium Complexes, 12-Crown-4, 18-Crown-6, Pyridine 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0529.pdf 
 Identifier    ZNB-1995-50b-0529 
 Volume    50 
5Author    P. E. Te, G. JonesRequires cookie*
 Title    Polysulfonylamine, XC [1] Carbonsäure-Dimere, Wasser-Dimere und 18-Krone-6-Moleküle als Baugruppen eines supramolekularen Kettenpolymers: Darstellung und Struktur von (CH2CH20 ) 6 * 4 H20 * 2 H N (S 02C6H4-4 -C 0 0 H ) 2  
 Abstract    P o ly su lfo n y lam in es, X C [1] C a rb o x y lic A cid D im ers, W a te r D im e rs a n d 18-C row n-6 M o lecu les as B u ild in g B lo cks in a S u p ra m o le c u la r C hain P o ly m er: S ynth esis a n d S tru c tu re o f (C H 2C H 20) 6 • 4 H 20 • 2 H N (S 0 2C 6H 4-4 -C 0 0 H) 2 K a rn a W ijaya*, O liv e r M oers, A rm a n d B lasc h ette 
  Reference    Z. Naturforsch. 52b, 997—1002 (1997); eingegangen am 23. Mai 1997 
  Published    1997 
  Keywords    Di(4-carboxybenzenesulfonyl)amine, 18-Crown-6, Carboxylic Acid Dimer, Water Dimer, Ternary Complex of Uncharged Molecules 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0997.pdf 
 Identifier    ZNB-1997-52b-0997 
 Volume    52