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181Author    Ion Neda, Michael Farkens, Axel Fischer, PeterG. Jones, R. Einhard SchmutzlerRequires cookie*
 Title    Zur Chemie der l,3,5-Triaza-2-phosphinan-4,6-dione, Teil V* Darstellung der Phosphoryl(III)(A4P)-und Thiophosphoryl(III)(A4P)-Derivate der l,3,5-Triaza-2-phosphinan-4,6-dione. Umsetzungen mit Ketonen  
 Abstract    Chemistry of the l,3,5-Triaza-2-phosphinane-4,6-diones, Part V Synthesis of Phosphoryl(III)(^4P) and Thiophosphoryl(III)(/!.4P) Derivatives of 1.3.5-Triaza-2-phosphinane-4,6-diones. Reactions with Ketones 18. M ärz 1993 1.3.5-Trimethyl-Substituted l,3,5-Triaza-2-oxo-and 1.3.5-Triaza-2-thio-2/.4-phosphinane-4, 
  Reference    Z. Naturforsch. 48b, 860—866 (1993); eingegangen am 
  Published    1993 
  Keywords    6-diones, N M R Spectra, Mass Spectra, X-Ray 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-0860.pdf 
 Identifier    ZNB-1993-48b-0860 
 Volume    48 
182Author    Michel Mégnamisi-Bélombé, Irene Jokwi, Emmanuel Ngameni, R. Obert Roux, Bernhard NuberRequires cookie*
 Title    X-Ray Structure, Electrochemical and Electronic Spectroscopic Examination of Cobaloximatic Acid: Hydro-fraw5-diiodobis(ethanedioximato(l-)-N,N')cobaltate(III). Extended Intermolecular O-H-O Bridging in the Solid  
 Abstract    The structure of the cobaloximatic acid, hydro-rrans-diiodobis(ethanedioximato(l-)-N,N')cobaltate(III), has been determined by X-ray diffraction. Crystal data: C4H7CoI2N40 4, Mr = 487.87; monoclinic space group P2xta (C|h); a -10.795(7), b = 9.003(7), c = 11.881(6) Ä; ß = 97.29(6)°; V = 1145.35 Ä3; Z = 4; dc = 2.83 Mg n r3. Rw (R) = 3.6 (3.9)% for 3064 observed independent reflections and 148 parameters. The coordination geometry around Com is a dis­ torted (4 + 2) octahedron of four chelating equatorial N atoms and two apical iodides. The compound is most adequately formulated as a monovalent strong acid: H(Co(GH)2I2) (GH_ = ethanedioximate or glyoximate). The H atoms of the oxime groups are involved in the usual mframolecular, as well as in much stronger internlolecular O -H -O bridgings (O — Ointramol = 2.613-2.631, O — Ointervo, = 2.454 Ä). The "acidic" H atom of each molecule participates in the intennolecular bridging which extends throughout the structure, and propagates nearly parallel to the [101] crystallographic direction. The redox properties of the present compound were examined by cyclic voltammetry in acetonitrile solution at room tem­ perature. Redox waves attributed to the reduction of Co11 1 and to the oxidation of T were ob­ served, along with a wave which may be linked to the reduction of the "acidic" proton. 
  Reference    Z. Naturforsch. 48b, 1360—1364 (1993); received May 17 1993 
  Published    1993 
  Keywords    X-Ray, Cobaloximatic Acid, Extended Hydrogen Bridging, Cyclic Voltammetry 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-1360.pdf 
 Identifier    ZNB-1993-48b-1360 
 Volume    48 
183Author    KatteshV. Katti, PrahladR. Ad, CharlesL. Singh3c, KavitaK. Barnesb, Katti3, Karel Kopickad, AlanR. Ketringd, WynnA. VolkertcRequires cookie*
 Title    Organometallic Phosphinimines as Building Blocks for Potential New Radiopharmaceuticals. Synthesis, Structure and Reactivity of Ph3P=NH2+R e 0 4~  
 Abstract    of the organometallic phosphinimine Ph3P=N-SiMe3 (1), with aqueous R e0 4~ and 188R e 0 4~ yield the ion pairs Ph3P=NH2+M 04~ (M = Re (2); 188Re (4)). The ion pairs under­ go dehydration upon heating to produce the neutral Re(VII) species: Ph3P = N -M 03 (M = Re (3); 188Re (5)). The solid state structure of Ph3P=NH2+R e04~ (2) shows the presence of hy­ drogen bonding between the iminato hydrogen and the rhenium oxo center. The relevance of such reactions for the design of new radiopharmaceuticals is discussed. 
  Reference    Z. Naturforsch. 48b, 1381—1385 (1993); received January 15/June 181993 
  Published    1993 
  Keywords    Phosphinimines, Radiopharmaceuticals, X-Ray, Nuclear Medicine, Radio-Rhenium Reactions 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-1381.pdf 
 Identifier    ZNB-1993-48b-1381 
 Volume    48 
184Author    Oliver Seeger, Joachim SträhleRequires cookie*
 Title    BaCeN2, ein Bariumnitridocerat(IV) mit einer Struktur vom awf/-TiP-Typ BaCeN2, a Barium nitridocerate(IV ) with a Structure of the anti-TiP Type  
 Abstract    Reaction of Ba3N 2 with CeN in the stoichiometric ratio 1:3 at 850 °C under an atmosphere of N 2 followed by quenching yields air and moisture sensitive BaCeN 2. The product crystalli­ zes isotypically to /?-R bSc02 with the anti-TiP type structure in the hexagonal space group P 63/mmc with a = 365.06(2), c = 1266.03(3) pm, Z = 2. The structure was determined using X-ray and neutron powder diffraction data. In the structure the Ba2+ cations occupy trigonal prismatic holes with distances B a -N = 288(1) pm while the Ce atoms are in octahedral positions with distances C e -N = 242.4(8) pm. 
  Reference    Z. Naturforsch. 49b, 1169—1174 (1994); eingegangen am 27. April 1994 
  Published    1994 
  Keywords    Bariumnitridocerate(IV), Synthesis, Structure, X-Ray, Neutron Powder Diffraction 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1169.pdf 
 Identifier    ZNB-1994-49b-1169 
 Volume    49 
185Author    Z. NaturforschRequires cookie*
 Title    Structure and Magnetic Properties of a Dinuclear Complex with Iron(III) in Octahedral and Pyramidal Coordination  
 Abstract    [FeL(M eO H)C l]2 (L = N-(2-hydroxyphenyl)salicylaldimine) was synthesized and its crystal structure determ ined, [C27H 20N 2O5Cl2Fe2], monoclinic, space group P 2 a/c, a = 9.528(1), b = 7.684(1), c = 18.365(2) Ä , ß = 109.83(1)°, V = 1264.8 Ä 3, Z = 2. Two identical [FeL(M eOH)Cl] fragments, related by an inversion centre, are combined by the two bridging O atoms, to form a binuclear unit. The iron(III) centers are separated by 3.163(2) A and weakly antiferro-magnetically coupled (J = -8 .0 (1) cm -1), which follows from temperature -dependent mag­ netic susceptibility m easurements in the range 4.2 to 288 K. The effective magnetic moment per iron(III) is /ueff = 7.4 /uB at 288 K. 
  Reference    Z. Naturforsch. 49b, 1239—1242 (1994); received March 28 1994 
  Published    1994 
  Keywords    Dinuclear Iron(III) Complex, X-Ray, Structure, Magnetic Properties, Antiferromagnetic Coupling 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1239.pdf 
 Identifier    ZNB-1994-49b-1239 
 Volume    49 
186Author    RolfW. Saalfrank3, Oliver Struck3, Karl Petersb, HansG. Eorg, Von SchneringbRequires cookie*
 Title    Synthese und Struktur diastereomerer, zweikerniger Kupferkomplexe [1] Synthesis and Structure of Diastereomerie Dinuelear C opper Complexes [1]  
 Abstract    Depolym erisation of a copper(II)/pyrrolidine-based 2D -polym er 2 by 4.4'-bipyridyl [molar ratio: 2 (C u L 2) : l (Bipy)] and recrystallisation o f the reaction product leads to two visually distinguishable crystal charges, composed of dark green octahedra m eso-4 and light green rod-shaped crystals racem-5. Separation of the conglom erate of the morphologically different crystals is accomplished by pick out. The structure of the dinuelear complex racem-5 has been established unambigously by X-ray structure analysis. EPR and susceptibility measure­ ments of mixtures of complex meso-4 and racem-S indicate that there is no interaction be­ tween the two copper(II) centres. 
  Reference    Z. Naturforsch. 49b, 1410—1414 (1994); eingegangen am 17. März 1994 
  Published    1994 
  Keywords    Coordination Polymers, Depolymerisation, Dinuelear Copper Complexes, Diastereomers, X-Ray 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1410.pdf 
 Identifier    ZNB-1994-49b-1410 
 Volume    49 
187Author    Z. NaturforschRequires cookie*
 Title    Chemie polyfunktioneller Moleküle, 114 [1]  
 Abstract    Synthese und Struktur eines ionischen und nichtionischen, cyclischen Carbaphosphazens und eines Cobalt(III)phosphazen-Komplexes C hem istry of Polyfunctional M olecules, 114 [1] Synthesis and Structure of an Ionic and N on Ionic Cyclic C arbaphosphazene and of a C o b alt(III)phosphazene Com plex Jochen E llerm ann3 *, Jörg S u tter3, Falk A. K noch3, M atthias M oll3, W alter B au e rb Reaction of Ph2 P -N -P (P h 2) -N -(Ph2)PCoP(Ph2) -N -P (P h 2) -N -PPh2 (1) in CH2 C12 with benzimidazole yields (CH2 -PPh2 = N -PPh2 = N -PPh2)+C l" ([4]+C L). The salt [4]+BPh4" has been prepared in THF by metathesis of [4]+C l_ with N aBPh4. D eprotonation of the cationic ring in [4]+BPh4_ was accomplished using l,8-diazabicyclo[5.4.01 7 ]undec-7-ene and resulted in the six-membered carbacyclophosphazene CH=PPh2 -N = P P h 2 -N = P P h 2 (6). Treating 1 with 8 -hydroxyquinoline in CH2 C12 yields the octahedral c/s-complex (N 0) 2 CoP(Ph2) -N -P (P h 2) -N -P P h 2 (7) (N O = 8 -oxyquinolinate group). The com ­ pounds [4]+BPh4~, 6 and 7 are characterized by their IR, Raman, 3 1 P{1H) NM R, 1 3 C{1 H} N M R , !H NMR and mass spectra. Crystals suitable for X-ray structure analyses have been obtained for [4]+BPh4_ and_7x0.5 CH2 C12. The colourless plates of [4]+BPh4_ crystallize in the triclinic space group P I, with the lattice constants a = 1172.7(3), b = 1326.2(3), c = 1806.1(6) pm; a = 100.79(2), ß = 103.71(3), y = 108.18(2)°. The black blocks o f 7 x 0 .5 C H 2 C12 crystallize in the monoclinic space group P 2 x!c with the lattice constants a = 1159.0(10), b = 2008.9(10), c = 2034.6(12) pm; ß = 105.86(5)°. 
  Reference    Z. Naturforsch. 49b, 1763—1773 (1994); eingegangen am 25. April 1994 
  Published    1994 
  Keywords    Cyclic Carbaphosphazene Systems, Cobalt Complexes, Syntheses, NM R Spectra, X-Ray 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1763.pdf 
 Identifier    ZNB-1994-49b-1763 
 Volume    49 
188Author    Z. NaturforschRequires cookie*
 Abstract    C om plexes of the types R3 P b -F e (C O)2Cp [R = Me (la), Et (lb), 'Pr (lc), 'Bu (Id)]. R2 Pb[Fe(CO)2 Cp] 2 [R = Me (2a), Et (2b)], 'Pr2 (B r)P b -F e(C O)2Cp (3c) and [R2 PbFe(CO) 4 ] 2 [R = Me (4a), Et (4b), 'Pr (4c)], as well as the spiro-complexes Pb[Fe(C O)4 PbR2 ] 2 [R = Me (5a), Et (5b), 'Pr (5c)] and Pb[Fe(CO) 4 ] 4 (6) were studied by multinuclear magnetic reso­ 
  Reference    Z. Naturforsch. 49b, 1781—1788 (1994); received July 28 1994 
  Published    1994 
  Keywords    Carbonyliron-Lead Complexes, NM R Spectra, Coupling Sign Determination, X-Ray 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1781.pdf 
 Identifier    ZNB-1994-49b-1781 
 Volume    49 
189Author    Volker Lorenz3, Bernhard Neumiillerb, Karl-Heinz Thiele3Requires cookie*
 Title    Synthese und Kristallstrukturen von Diazadien-Komplexen der Erdalkalimetalle Syntheses and Crystal Structures of Diazadiene Complexes of the Alkaline Earth Metals  
 Abstract    [C aN R -CPh=CPh-N R (D M E)2] 1 (R = C6H4-4 -C H 3; D M E = dim ethoxyethane) was pre­ pared by reaction of calcium with N R = C P h -C P h = N R in D M E solution. The compound forms orange, moisture sensitive crystals, which were characterized by an X-ray structure determination [space group orthorhombic, P 2 i2 12 1, Z = 4, 4634 observed unique reflections, R = 0.046; lattice dimensions at -7 0 °C: a = 1340.2(3), b = 1528.1(3), c = 1609.1(3) pm]. The calcium atom is coordinated by the four oxygen atoms of two chelating D M E molecules and two nitrogen atoms of the diazadiene ligand, bonded in its enediam ide form. [Ba2(D M E)3(N P h -C P h = C P h -N P h)2 DM E] 3 was obtained from barium metal and N Ph=C Ph-C Ph=N Ph in D M E solution as red crystals [space group monoclinic, P2!/c, Z = 4, 4000 observed unique reflections, R = 0.166; lattice dim ensions at -7 0 °C: a = 1704.5(3), b = 1786.1(4), c = 2177.4(4) pm, ß = 105.98(3)°]. The two barium atoms are bridged by two differently bonded diazadiene ligands (/<2-N ,N ';/i-N ,a -N '). Additionally, one of the barium atoms is coordinated to two DM E m olecules and the other one to only one of the ether molecules. A further DM E molecule is a constituent of the crystal lattice. 
  Reference    (Z. Naturforsch. 50b, 71—7 [1995]; eingegangen am 13. Juli 1994) 
  Published    1995 
  Keywords    Alkaline Earth Metal Complexes, Diazadiene Ligands, Enediamide Structure, X-Ray 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0071.pdf 
 Identifier    ZNB-1995-50b-0071 
 Volume    50 
190Author    A. Chrissafidou, J. Fuchs, H. Hartl, R. PalmRequires cookie*
 Title    Kristallisation und Strukturuntersuchung von Alkali-Parawolframaten Crystallization and Structure Determ ination of Alkaline M etal-Paratungstates  
 Abstract    The syntheses and crystal structures of the following paratungstates-Z with different alka­ line cations are reported and discussed: N a10[H2W 120 42]-2 0 H 20 (I), N a10[H2W 12O 42]-2 7 H 20 (II), N a10[H2W 12O47] -2 8 FLO (III), K10[H2W 120 42] 1 0 H 20 (IV), K6Na4[H ,W 120 42]-1 3 H 20 (V), Cs6Na4[H?W P0 42] • 16IÜO (VI), Cs8N a2[H2W 120 42]-1 0 H 20 (VII), Cs8Na2[H2W 120 42] • 12 H20 (VIII), K3N a7[H2W 120 42] -24H 20 (IX) and KsNa2[H2W 120 42] • 12H20 (X). Priority has been set on the description of the coordination of the cations with the oxygen ligands H2W 12O 4210_ and h 2o . 
  Reference    Z. Naturforsch. 50b, 217 (1995); eingegangen am 22. Juli 1994 
  Published    1995 
  Keywords    Paratungstates-Z, Synthesis, Structure Determination, X-Ray, Cation Coordination 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0217.pdf 
 Identifier    ZNB-1995-50b-0217 
 Volume    50 
191Author    Anne Utzolino, Karsten BluhmRequires cookie*
 Title    Cox 5Ti0 5(B 0 3) 0 and Co! 5Zro.5(B 0 3) 0  
 Abstract    Single crystals of Co15Tio.5(B 0 3)0 (I) and Coj 5Zr0 5(BO3)O (I I) were obtained by a B20 3 flux technique. Both compounds crystallize with orthorhombic symmetry, space group D -Pnma (Nr. 62), I a = 928.1; b = 311.1; c = 940.1 pm; Z = 4 and I I a = 949.5; b = 323.42; c = 934.7 pm; Z = 4. The compounds are isotypic to the mineral warwickite. All metal ions are octahedrally coordinated by oxygen ions. The structure contains isolated, trigonal planar B 0 3 units and oxygen that is not coordinated to boron. Die Synthese und Kristallstruktur von cobalthaltigen Boratoxiden: Coi^Tio,5(B03)0 und C o i?5Zr<),5(B03)0 
  Reference    Z. Naturforsch. 50b, 1653—1657 (1995); eingegangen am 4. Mai 1995 
  Published    1995 
  Keywords    Cobalt, Titanium, Zirconium, Borate Oxide, Crystal Structure, X-Ray 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-1653.pdf 
 Identifier    ZNB-1995-50b-1653 
 Volume    50 
192Author    Eva-M Struckb, Karl Aria Peters0, H. Petersc, Georg Ans, Von SchneringcRequires cookie*
 Title    Verknüpfung koordinativ ungesättigter Kupfer(II)-Monomere via Cyano-versus Tetrazolyl-Donor [1]  
 Abstract    Reaction of a methanolic copper(II) acetate solution with tetrazolyl enol derivatives 2a (HL2) or 2b (HL3) leads to the formation of the corresponding 2D-coordination polymers 4 (^ [CuL^]) and 5 (^ [CuL2]), respectively. Single-crystal X-ray diffraction of the supramolecular species 4 and 5 established unequivocally the structures of the regioisomeric coordination polymers. On the contrary, reactions of 2c (HL4) with methanolic copper(II) acetate solution and 2b (HL3) with methanolic zinc(II) acetate solution yield mononuclear chelate complexes 11 ([CuL2]) and 12 ([ZnL2(MeOH)2]). The structures of 11 and 12 have been established by X-ray structure analysis. 
  Reference    Z. Naturforsch. 51b, 399—408 (1996); eingegangen am 14. August 1995 
  Published    1996 
  Keywords    Tetrazolyl Enols, Coordination Polymers 2D Copper Complexes, Spontaneous Self-Assembly, X-Ray 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0399.pdf 
 Identifier    ZNB-1996-51b-0399 
 Volume    51 
193Author    Ayhan Elmalia, Yalcin Elerman3, Ingrid Svoboda, Hartmut Fuessb, Klaus Griesar0, Wolfgang HaasecRequires cookie*
 Title    Structure and Spin-Spin Interactions in a Linear Trinuclear Ni(II) Complex  
 Abstract    [Ni3(C2H302)2(C3H8N0)2L2] 1(L=N,N'-1,3-propyl-disalicylaldimine), (C2H30 2)=acetate, (C3H><NO)=hydroxymethyl-dimethylamine] has been synthesized and its crystal structure de­ termined, [C44H54N6OioNi3], triclinic, space group Pi, a = 9.560(1), b = 10.681(1), c = 12.200(1) A ,a = 112.17(1), ß = 101.25(1), 7 = 90.32(1)°, V = 1127.3 A \ Z = l.The molecule is linearly trinuclear with octahedral coordination of each nickel ion. The Ni-Ni distance is 3.048(1) A. Each nickel(II) atom is in an octahedral coordination. Magnetic susceptibility mea­ surements in the range 4.2 < T < 280 K have revealed antiferromagnetic coupling between adjacent Ni atoms (J\ = -2.2 cm-1) and between the terminal Ni atoms (/2 = -1 .7 cm-1). 
  Reference    Z. Naturforsch. 51b, 665—670 (1996); received October 20 1994 
  Published    1996 
  Keywords    X-Ray, Linear Trinuclear Nickel Complex, Magnetic Properties, Antiferromagnetic Coupling 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0665.pdf 
 Identifier    ZNB-1996-51b-0665 
 Volume    51 
194Author    H. Schumann, B. Neumann, H.-G StammlerRequires cookie*
 Title    Spektroskopische und strukturelle Aspekte der Protonierung von Tetraaza[14]annulen-Dianionen Spectroscopic and Structural Aspects of the Protonation of Tetraaza[14]annulene Dianions  
 Abstract    The effects of increasing protonation upon two [ 14]annulene dianions prepared by reaction of LiCH3 with 5,14-dihydro-6,8,15,17-tetram ethyldibenzo[b,i][l,4,8,l l]tetraazacyclotetradecine 
  Reference    Z. Naturforsch. 51b, 1255—1266 (1996); eingegangen am 8. Februar 1996 
  Published    1996 
  Keywords    Nickel Complexes, Macrocyclic Ligands, Protonation, 7r-Conjugation, X-Ray 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1255.pdf 
 Identifier    ZNB-1996-51b-1255 
 Volume    51 
195Author    Z. NaturforschRequires cookie*
 Title    ,1-Organoboration of Sterically Hindered Tetra-l-alkynylsilanes and the Crystal Structure of Tetrakis[l-(3,3-dimethyl)butynyl]silane  
 Abstract    Tetra-l-alkynylsilanes, Si(C sC R *)4 with R 1 = 'Bu (1) and SiMe3 (2) react with triethyl-borane, E t3B. by intermolecular 1,1-ethyloboration followed by intramolecular 1.1-vinylo-boration. to give the substituted siloles 3 and 5 with two R 'C = C groups linked to silicon. The formation of 5 (R 1 = SiMe3) requires exactly one equivalent of E t3B, whereas 3 (R 1 = 'Bu) is formed after = 2 0 d in boiling toluene in the presence of a large excess of E t3B, and the remaining 'B u -C = C groups in 3 do not react with E t3B. The 1,1-organoboration of 2 using one equivalent of 9-ethyl-9-borabicyclo[3.3.1]nonane, Et-9-BBN, proceeds similar to the E t3B-reaction, to give mainly the silole derivative 6, in which the bicyclic ring system is enlarged by two carbon atoms. This product is the result of a kinetically controlled reaction. The single crystal X-ray analysis of 1 has been carried out (space group Pnm a; a = 990.0(2), b = 1668.0(3), c = 1479.0(3) pm), and its crystal structure is com pared with that of the corre­ sponding tin compound 1 (Sn). 
  Reference    Z. Naturforsch. 51b, 1320—1324 (1996); received March 14 1996 
  Published    1996 
  Keywords    Tetra-l-alkynylsilanes, 1, 1-Organoboration, Siloles, X-Ray 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1320.pdf 
 Identifier    ZNB-1996-51b-1320 
 Volume    51 
196Author    Ayhan Elmali3, Yalcin Elermana, Ingrid Svobodab, Hartmut Fuessb, Klaus Griesar0, Wolfgang HaasecRequires cookie*
 Title    Structure and Magnetic Properties of a Dinuclear Copper(II) Complex  
 Abstract    [Cu2L] (L=N-2-hydroxy-4-methylphenyl-4-oxo-2-pentalketimine) was synthesized and its crystal structure determined. C24H?6Cu2N204 monoclinic space group P2|/n with a= 10.978(2), 17.045(3), c= 11.958(2) Ä, ß = 101.89(1)°, V = 2189.6(7) A3,Z = 4. Two copper(II) atoms in a distorted square-planar coordination are bridged by two oxygen atoms to form a dinuclear unit. The copperfll) centers are separated by 3.025(1) A and antiferro-magnetically coupled (7=-222.3 cm), which follows from temperature-dependent magnetic susceptibility measurements in the range 4.2 to 300 K. 
  Reference    Z. Naturforsch. 52b, 157—161 (1997); received September 30 1996 
  Published    1997 
  Keywords    Dinuclear Cu(II) Complex, X-Ray, Structure, Magnetic Properties, Antiferromagnetic Coupling 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0157.pdf 
 Identifier    ZNB-1997-52b-0157 
 Volume    52 
197Author    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 
198Author    Albert Würflinger, Denise Mondieig3, Fazil Rajabalee3, MiquelAngel Cuevas-DiartebRequires cookie*
 Title    pVT Measurements and Related Studies on the Binary System /iC16H34 -tiC17H36 and on wC18H38 at High Pressures  
 Abstract    The phase diagram of the binary system nC16H34 -rcC17H36 has been established at ambient pressure using DSC and crystallographic measurements. At low temperatures below the rotator phase RI there exist two crystal forms Op (about jc(C17) = 0.25) and Mdci (about x(C17) = 0.67) which are different from the crystal structures of the pure compounds (Tp for C 16 and Oi for C 17). Furthermore two compositions: (a) C 16/C 17 = 3:1 and (b) = 1:2, which correspond to the coexistence range of Op and Mdci, were chosen for high pressure DTA and pVT measurements, yielding the following findings: The specific volume of the rotator phase of C 17 is distinctly lower than those of the binary systems at the same state point. Assuming the existence of a metastable rotator phase for C 16, an excess volume of A V E/V « 0.01 can be estimated. Due to the very enlarged coexistence range of RI, the mixtures reach their lower transition point at considerably lower temperatures (in isobaric measurements) or higher pressures (in isothermal measurements), where the specific volume is lower than that of C 17 at its transition point. Furthermore, the volume and enthalpy changes of the O ord -RI transition is distinctly smaller for the binary systems than for pure C 17. Thus the specific volumes of the phases Op and Mdci are appreciably larger than t>(spec.) of C 17. Op and Mdci have practically the same specific volume in accordance with the crystallographic results. Enthalpy values are obtained with the aid of the Clausius-Clapeyron equation which agree well with enthalpies derived from the DSC measurements. Furthermore, pVT data have been established for the liquid and solid phases of nC18H38 in the neighbourhood of the melting curve, allowing to determine volume and enthalpy changes of melting as a function of pressure. 
  Reference    Z. Naturforsch. 56a, 626—634 (2001); received July 18 2001 
  Published    2001 
  Keywords    Hexadecane, Heptadecane, Octadecane, pVT, Excess Volume, Phase Transition, High Pressure, X-ray 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0626.pdf 
 Identifier    ZNA-2001-56a-0626 
 Volume    56 
199Author    Requires cookie*
 Abstract    M alco lm B id d l e st o n e a n d R o b e rt A. S h a w D epartm ent The title compound was synthesized and its structure determined by X -ra y crystallo­ graphy. The NPPI13 substituent adopts a type I conformation with its nitrogen and phosphorus atom s coplanar w ith the ring. The compound, the first asymm etric 1,3,5-triazine to be crystallographically investi­ gated, shows significant variations in ring bond lengths and angles; these are discussed. 
  Reference    (Z. Naturforsch. 30b, 973—974 [1975]; received August 4 1975) 
  Published    1975 
  Keywords    Asym m etric 1, 3, 5-Triazine, X -ray, Crystal Structure, Conformation, Triphenylphosphazenyl Group 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0973_n.pdf 
 Identifier    ZNB-1975-30b-0973_n 
 Volume    30 
200Author    W. S. Sheldrick, J. A. Gibson, G.-V RöschenthalerRequires cookie*
 Title    The Crystal Molecular Structure of the Adduct of 2,2,2-Trifluoro-4,4,5,5-tetrakis(trifluoromethyl)-l,3,2A 5 -dioxaphospholane with Trimethylphosphine. A Strong P —» P Coordinate Bond  
 Abstract    The adduct of 2,2,2-trifluoro-4,4,5,5-tetrakis(trifluoromethyl)-1,3,2 A 5 -dioxaphospholane with trimethylphosphine crystallises in the orthorhombic space group Pbcm, Z = 4, with a — 11.018(2), b — 12.978(4), c= 11.607(2) A at —120 °C. The perfluoropinacolyl ring system lies in a crystallographic plane of symmetry. This ring conformation and the very long endocyclic C-C bond and average C-CF3 distances of respectively 1.59(1) and 1.59(1) A are presumably a consequence of very short F---F steric contacts. The P->P bond distance of 2.234(5) is very short for a coordinate bond being only 0.01-0.03 A longer than that typically observed for a a-bond. The tr-bond lengths to the hexacoordinate phosphorus are influenced by the nature of the Zrans-bond in the octahedron. 
  Reference    Z. Naturforsch. 33b, 1102—1 (1978); eingegangen am 22. Juni 1978 
  Published    1978 
  Keywords    X-ray, Hexacoordinate Phosphorus Adduct, Coordinate P-*P Distance Planar Perfluoropinacolyl Ring System, Long Endocyclic C-C Bond 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-1102.pdf 
 Identifier    ZNB-1978-33b-1102 
 Volume    33