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1994[X]
1Author    Mit Unterschiedlich, Koordinierten Zinkionen, Joachim Pickardt, Gill-Taik Gong, Sabine Wischnack, Christina SteinkopffRequires cookie*
 Title    Kristallstruktur zweier Zinkthiocyanat-Hexamethylentetramin-Addukte, Zn(SCN)2» (Q H ^N,), und {Zn(SCN)2 C6HnN4 2H 20}(SCN)2-(C6H 12N4)2, and {Zn(SCN)2-C6H 12N4-2H 20}", with Differently Coordinated Zinc Ions  
 Abstract    of the adducts Zn(SCN),-(C6H12N4)2 (1), and {Zn(SCN)2-C6H 12N4-2H20}" (2) were obtained by crystallization from aqueous solutions containing hexamethylenetetrami­ ne, potassium thiocyanate and zinc nitrate or zinc sulfate, resp., under identical conditions, as two totally different products. 1 crystallizes orthorhombically, space group P nmm, Z -2, a -622.4(5), b -1152.3(7), c = 1394.0(9) pm; 2 is monoclinic, space group C2/c, a = 984.4(3), b = 1217.0(5), c = 1257.4(6) pm, andß = 111.69(5)°. The crystal structure of 1 contains discrete molecules of the complex, in which the zinc ion is tetrahedrally coordinated by two NCS li­ gands, and two hexamethylenetetramine molecules, which act as monodentate ligands. In 2 however, the zinc ions are octahedrally coordinated. A "supramolecular" structure is form­ ed: The hexamethylenetetramine molecules act as bridging bidentate ligands and connect [Zn(H20) 2(NCS)2] units forming zig-zag chains. Adjacent chains are interconnected via hydrogen bonds. The formation of the two compounds with different coordination may be due to the fact, that the educts Zn(N03)2-4H20 and ZnS04-7H20 contain Zn(H20) 4 and Zn(H20) 6 moieties, resp., and that these species are retained in solution. 
  Reference    Z. Naturforsch. 49b, 325—329 (1994); eingegangen am 24. August 1993 
  Published    1994 
  Keywords    Hexamethylenetetramine Complexes, Zinc Thiocyanate Adducts, Crystal Structure Crystals 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0325.pdf 
 Identifier    ZNB-1994-49b-0325 
 Volume    49 
2Author    Jörn Müller, PetraEscarpa Gaede, Ke QiaoRequires cookie*
 Title    ^-Olefin-Iridium-Komplexe, XXII [1] C -H -Aktivierung von aromatischen und aliphatischen Solvensmolekülen RH bei der Reaktion von [Cp*IrCI2 ] 2 mit Butadienmagnesium unter Bildung von [Cp*Ir(773-C4H 7)R] sowie Kristallstruktur von [Cp*Ir(i/3-C4H 7)C6H 5] jr-Olefin Iridium Complexes, XXII [1] C -H Activation of Aromatic and Aliphatic Solvent Molecules RH in the Reaction of [Cp*IrCl2 ] 2 with Butadienemagnesium with Formation of [Cp*Ir(?;3 -C4 H 7 )R], and Crystal Structure of [Cp*Ir(773 -C4 H 7 )C6 H 5] Activation of C -H , (l-Methylallyl)(pentamethylcyclopentadienyl)iridium-a-organyl Com­ plexes  
 Abstract    Reactions of [Cp*IrCl2]2 (Cp* = ^3-C5M e5) with [MgC4H6 -2 THF]" at low temperature give [Cp*Ir(^4-C4H6)] together with [Cp*Ir(/73-C4H 7)R] compounds, the latter being formed via C -H activation of solvent molecules RH (RH = benzene, toluene, anisole, thiophene, furane, N-methylpyrrole, pentane, cyclohexane. THF). In the case of pyrrole, C -N -activation occurs. The ratio of syn and anti isomers of the 1-methylallyl com plexes as well as the sites o f C -H activation of RH were investigated by NM R spectrometry. An enantiomorphous crystal of [Cp*Ir(773-C4H7)C6Hs] was characterized by X-ray diffraction analysis which reveals trigonal planar coordination at the Ir atom and an exo, syn conformation o f the 1-methylallyl ligand. A mechanism of the reaction which involves 16-electron intermediates is discussed. The corresponding system [Cp*RhCl2]2/butadienemagnesium/RH gives only [Cp*Rh(>/4-C4H6)], and no C -H activation is observed. 
  Reference    Z. Naturforsch. 49b, 1645—1653 (1994) 
  Published    1994 
  Keywords    Synthesis, NMR Spectra, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1645.pdf 
 Identifier    ZNB-1994-49b-1645 
 Volume    49 
3Author    Enno Lork, Ulrich Behrens, G. Ünter Steinke, Rüdiger MewsRequires cookie*
 Title    Die Kristallstruktur von trans-l,3?5-Trichloro-l,3>5-trioxo  
 Abstract    1 A6, 3 A6, 5 A6,2,4,6-trithiatriazin (/?-Sulfanurchlorid) The Crystal Structure o f /raws-1,3,5-Trichloro-1,3,5-trioxo-1 X6, 3/i6, 516, 2,4,6-trithiatriazine (/?-Sulfanuric Chloride) The crystal structure o f /?-(N S(0)C l)3 is reported. 
  Reference    Z. Naturforsch. 49b, 437 (1994); eingegangen am 22. November 1993 
  Published    1994 
  Keywords    Trichlorotrioxotrithiatriazines, Sulfanuric Chlorides, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0437.pdf 
 Identifier    ZNB-1994-49b-0437 
 Volume    49 
4Author    Müller-BuschbaumRequires cookie*
 Title    Zur Kristallchemie der Oxoplatinate. Eine neue Phase der Zusammensetzung Sr4_j.Naj.PtO6 (jt = 0,33)  
 Abstract    On the Crystal Chemistry of Oxoplatinates. A New Phase of the Composition Sr4 _xN avP t0 6 (x -0.33) G. Tams, Hk. Single crystals of Sr3 67Na() 33PtO fi were prepared by heating oxide mixtures in closed silver tubes and investigated by X-ray single crystal techniques. It crystallizes with trigonal symme­ try, space group Dfd-R 3 c (Nr. 167) with a = 9.6617, c = 11.6580 Ä, Z = 6. Sr367Na()33P t0 6 belongs to the Sr4P t0 6 type and is isotypic to K4CdCl6. One point position characterized by a trigonal prismatic O 2-coordination is occupied by N a+ and Sr2+ statistically. The crystal structure is discussed with respect to the related compounds Sr3C u P t0 6 and Ca3 5Cu() 5P t0 6. 
  Reference    Z. Naturforsch. 49b, 581—584 (1994); eingegangen am 12. Januar 1994 
  Published    1994 
  Keywords    Strontium, Sodium, Platinum Oxide Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0581.pdf 
 Identifier    ZNB-1994-49b-0581 
 Volume    49 
5Author    Siegfried Pohl, Michael Peters, Detlev Haase, Wolfgang SaakRequires cookie*
 Title    Bildung von Iodoantimonaten und -bismutaten. Kristallstrukturen von (PhCH2NEt3)4 [Sb6l 2 2 L (PhCH2NEt3)4 [Bi6l 2 2 ] und (Ph4P)3[Bi5I18] Form ation of Iodoantim onates and Bismutates. Crystal Structures of (PhCH 2N E t3)4[Sb6I22], (PhC H 2N Et3)4[Bi6l22] and (Ph4P)3[Bi5I 18]  
 Abstract    The formation and the crystal structures of the title compounds are reported. (PhCH2N E t3)4[Sb6l 22] and (PhCH 2N E t3)4[Bi6l 22] are isotypic and contain a novel [E6I22]4~ anion (E = Sb, Bi). The anion of (Ph4P)3[Bi5I18] consists of a linear chain of five face-sharing [B il6] octahedra. 
  Reference    Z. Naturforsch. 49b, 741—7 (1994); eingegangen am 27. Januar 1994 
  Published    1994 
  Keywords    Iodoantimonates, Iodobismutates, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0741.pdf 
 Identifier    ZNB-1994-49b-0741 
 Volume    49 
6Author    Viktor Keimes, Albrecht MewisRequires cookie*
 Title    MgNi2P -das erste ternäre Phosphid mit geordneter Fe3C-Struktur MgNi2P -The First Ternary Phosphide with an O rdered Fe3C Type Structure  
 Abstract    MgNi2P was prepared by heating a mixture of the elements and investigated by means of single crystal X-ray methods. The compound crystallizes in an ordered Fe3C-type structure 
  Reference    Z. Naturforsch. 49b, 1071—1073 (1994); eingegangen am 00. 00. 0000 
  Published    1994 
  Keywords    Ternary Nickelphosphide, Magnesium, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1071.pdf 
 Identifier    ZNB-1994-49b-1071 
 Volume    49 
7Author    Holger Szillat, Hanskarl Müller-BuschbaumRequires cookie*
 Title    Synthesis and Crystal Structure of Cuq^sH oj 25w 2o 8  
 Abstract    Single crystals of Cu(l.2sHO|.2sW20 8 were prepared by recrystallization from melts and investigated by X-ray diffractometer technique. Cuo^sHoj 25W 2Os crystallizes with m ono­ clinic symmetry, space group C2/c, o -19.123, b -5.613, c = 11.479 Ä , ß = 111.44°. Z = 8. It represents a new structure type characterized by W40 18 groups and Cu+/H o3+ at one point position in statistical distribution. Cu+/H o3+ show an octahedral coordination. A nother point position is occupied by Ho3+ with C. N. = 7. 
  Reference    Z. Naturforsch. 49b, 1145—1149 (1994); eingegangen am 25. März 1994 
  Published    1994 
  Keywords    Crystal Structure Copper Holmium, Tungsten, Oxide 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1145.pdf 
 Identifier    ZNB-1994-49b-1145 
 Volume    49 
8Author    Tsutomu Okuda, Yoshihiro Kinoshita, Hiromitsu Terao, Koji YamadaRequires cookie*
 Title    Structure and Bonding of Bromoantimonate (III) Complexes with Unusual Valency by Means of NQR and Powder X-Ray Diffraction  
 Abstract    NQR and powder X-ray diffraction were observed for several bromoantimonate (III) complexes which contain C"H2n+ jNF^ (n = 1 -3) or (C"H2lt + 1)2N H 2 (n = 1 -4) as a cation. The bond character, anion structure, crystal structure, and phase transition are discussed on the basis of the three-center-four-electron bond. A good correlation was found between the halogen NQR frequency and the Sb-X bond length. 
  Reference    Z. Naturforsch. 49a, 185—192 (1994); received July 23 1993 
  Published    1994 
  Keywords    81Br NQR, Temperature dependence, Phase transition, Crystal structure 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0185.pdf 
 Identifier    ZNA-1994-49a-0185 
 Volume    49 
9Author    Jacek ZaleskiRequires cookie*
 Title    Crystal Structure and Phase Transitions of [C(NH2)3]3Sb2C l9 * 0.9 H 20 A dam Pietraszko  
 Abstract    The room temperature structure of [C(NH2)3]3Sb2C l9 ■ 0.9 H 20 (GNCA) was solved. It crystal­ lizes in the monoclinic C2/c space group with a = 15.275, b = 8.794, c = 17.904 (in Ä), ß = 96.40°, V = 2390 Ä 3, Z = 4. Refinement of the atomic parameters by a least squares methods gave R = 0.042, wR = 0.039 for 1958 reflections with F>4ct(F). The structure consists of polyanionic (Sb2Cl|_)n layers built of deformed corner connected SbX^-octahedra. Two crystallographically inequivalent guanidinium cations are present, one situated between polyanionic layers, the other one together with a disordered water molecule inside cavities formed by polyanions. Temperature X-ray scattering experiments together with DSC studies were carried out above room temperature. Temperature dependence of the lattice parameters between 300 K and 380 K was determined and a phase transition of mixed order at 364 K was revealed. 
  Reference    Z. Naturforsch. 49a, 895—901 (1994); received June 7 1994 
  Published    1994 
  Keywords    Guanidinium, Chloroantimonate, Crystal structure, Phase transition, DSC 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0895.pdf 
 Identifier    ZNA-1994-49a-0895 
 Volume    49 
10Author    Z. NaturforschRequires cookie*
 Title    Die isoelektronischen Molekülkomplexe TiCl3(NPPh3) und TiCl3(OSiPh3)  
 Abstract    The Isoelectronic M olecular C om plexes TiC l3(N P P h 3) and T iC l3(O SiPh3) Thilo R übenstahl, D o ro th ea W olff von G udenberg, F ra n k W eller, K u rt D ehnicke* TiCl3(NPPh3) and TiCl3(OSiPh3) have been prepared from titanium tetrachloride and Me3SiNPPh3 and HOSiPh3, respectively. Both complexes were characterized by IR spectrosco­ py and by crystal structure determmations. TiCl3(N PPhj): Space group R3, Z = 6, structure analysis with 959 observed unique reflec­ tions, R = 0.039. Lattice dimensions at -6 8 °C: a = b = 1370.5(7), c = 1845.9(9) pm. TiCl}(OSiPh3): Space group P2,/c, Z = 8, structure analysis with 4549 observed unique re­ flections, R = 0.049. Lattice dimensions at 19 °C: a = 2127.7(2), b = 947.2(1), c = 2136.8(1) pm, ß = 105.081(5)°. Both complexes form monomeric molecules in which the titanium atom is tetrahedrally coordinated by three chlorine atoms, the nitrogen atom of the phosphorone iminato ligand and the oxygen atom of the silyloxy group, respectively. The bond lengths TiN of 171.9(4) pm and TiO of 171.0(3) (in average) correspond to double bonds. 
  Reference    (Z. Naturforsch. 49b, 15—20 [1994]; eingegangen am 7. September 1993) 
  Published    1994 
  Keywords    Monomerie Titanium Complexes, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0015.pdf 
 Identifier    ZNB-1994-49b-0015 
 Volume    49 
11Author    Z. NaturforschRequires cookie*
 Title    Gold-Alkalimetallsysteme, III. Hochdrucksynthese und Kristallstruktur von Rb3Au7 [1]  
 Abstract    G old-A lkali M etal-System s, III. H igh Pressure Synthesis and C rystal S tructure o f R b 3A u 7 [1] K laus-Jürgen Range*, G eorg H. G rosch, F ran z R au, U lrich K lem ent The intermetallic compound Rb3Au7 could be synthesized from the elements at 4 kbar, 700 °C in a modified Belt-type apparatus. The structure (Cmmm; a = 5.579(1), b = 13.267(5), c = 7.265(2) Ä; Z = 2; R = 0.035, Rw = 0,031) comprises three crystallographically independ­ ent Au atoms, arranged in layers along the c-axis. The shortest interatomic distances are A u -A u = 2.633Ä, A u -R b = 3.438Ä and R b -R b = 3.622Ä. Im System R ubidium -G old [2,3] sind bisher n u r die V erbindungen R b A u [4] und R b A u 5 [5,6] ein­ deutig nachgewiesen und strukturell c h a ra k te ri­ siert w orden. Die Existenz von R b A u 2 [2,3,7] ko n n te bisher nicht verifiziert werden. D ie h o m o ­ logen V erbindungen N aA u 2 [8] und K A u 2 [9] sind Lavesphasen und kristallisieren im kubischen M gC u2-Typ bzw. im hexagonalen M g Z n 2-Typ. Bei unseren V ersuchen zur H ochdrucksynthese einer L avesphase R b A u 2 fanden wir nun eine bisher im System R b -A u unbekannte Phase d er Z u sam ­ m ensetzung R b 3A u 7, über die im folgenden berich­ tet w ird. 
  Reference    (Z. Naturforsch. 49b, 27—30 [1994]; eingegangen am 6. Juli 1993) 
  Published    1994 
  Keywords    Trirubidium Heptagold, High Pressure Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0027.pdf 
 Identifier    ZNB-1994-49b-0027 
 Volume    49 
12Author    Thom As Schleid, Falk LissnerRequires cookie*
 Title    Oxidsulfidchloride der Lanthanide vom Typ M 4OS4Cl2 (M = L a-N d ) M 4OS4Cl2-Type Oxysulfide Chlorides of the Lanthanides (M = L a -N d )  
 Abstract    Oxysulfide chlorides, M4OS4Cl2, o f the lanthanides (M = L a -N d) are obtained upon the oxi­ dation o f the metals with sulfur in the presence o f MOC1 (or M 20 3) and MC13 in appropriate molar ratios. Additional NaCl or an excess o f MC13 serving as a flux provide even single crys­ talline material after reactions at 850 °C for seven days in sealed tantalum capsules. The crys­ tal structure o f M4OS4Cl2 (hexagonal, P 6 3mc, no. 186, Z = 2; M = La: a = 933.19(3), c = 701.22(4) pm, c/a = 0.7514, R = RH = 0.020; M = Ce: a = 925.49(3), c = 694.13(3) pm, c/a = 0.7500; M = Pr: a = 919.72(4), c = 688.53(4) pm, c/a = 0.7486; M = Nd: a = 914.25(4), c = 683.12(4) pm, c/a = 0.7472, R = 0.022, Rw = 0.019) contains isolated 0 2--centered (M 3+)4 te-trahedra which are surrounded by twelve S2-and six Cl-, capping vertices, edges, and faces o f each tetrahedron and linking to other [OM4] units. Basically, the structure is identical to that o f Ba4OCl6 if Ba2+ is substituted by M 3+ and 2/3 o f the CL anions are replaced by S2-to secure charge neutrality in M4OS4Cl2. Different models for the C L /S 2-replacement are presented on the basis o f comparisons o f the Madelung part o f the lattice energy (M A PLE) with the M APLE sum o f the binaries (M 20 3, M 2S3, and MC13). 
  Reference    Z. Naturforsch. 49b, 340 (1994); eingegangen am 27. September 1993 
  Published    1994 
  Keywords    Lanthanides, Oxysulfide Chlorides, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0340.pdf 
 Identifier    ZNB-1994-49b-0340 
 Volume    49 
13Author    Frank Weller, Fritjof Schmock, Kurt Dehnicke, Kurt Findeisen Bayer-WerkRequires cookie*
 Title    Synthese, IR-Spektrum und Kristallstruktur von 1.3.5-Trichlortriazinium-hexachloroantimonat, [HC3N3C13]SbCl6 Synthesis, IR Spectrum and Crystal Structure of 1.3.5-Trichlortriazinium Hexachloroantim onate, [HC3N3Cl3]SbCl6  
 Abstract    ,3,5-Trichlortriazinium hexachloroantimonate has been prepared by the reaction of CCl2 = N-COCl with antimony pentachloride in boiling dichloromethane. The compound was characterized by IR spectroscopy and by a crystal structure determination. [HC3N3Cl3]SbCl6 crystallizes in the monoclinic space group P 2 Jn with four formula units per unit cell. 2503 observed unique reflections, R = 0.029. Lattice dimensions at 19 °C: a = 1314.1(1), b = 958.2(1), c = 1329.1(1) pm, ß = 117.113(5)°). The compound forms ion pairs via a linear N -H • • • Cl bridge, thus distorting the SbCl6~ ion from octahedral geometry. The C3N3 skeleton of the [HC3N3C13]+ ion is nearly planar, but the hydrogen atom lies about 30 pm out of this plane. 
  Reference    Z. Naturforsch. 49b, 360—364 (1994); eingegangen am 3. November 1993 1.3. 
  Published    1994 
  Keywords    5-Trichlortriazinium Salt, Synthesis, IR Spectra, Crystal Structure 1 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0360.pdf 
 Identifier    ZNB-1994-49b-0360 
 Volume    49 
14Author    Enno Lork, Ulrich Behrens, Detlef Viets, Rüdiger MewsRequires cookie*
 Title    Die Kristallstruktur von A sF5 0 S C F 2S (0 2)CF2 The Crystal Structure of A sF 5 * 0& C F2S (0 2)C F 2  
 Abstract    The crystal structure of AsF5 • 0$C F2S(02)CF2 is reported. It crystallizes in the orthorhombic space group Pnma with a = 749.1(3) pm, b = 770.6(3) pm and c = 1630.0(5) pm, V = 960.9(6)-106 pm3, Z = 4. Einleitung Intensiv ist in den letzten Jähen die Chemie der Dithietane F 2tS (O x)FyC F 2S(Ov)Fw im Arbeitskreis Sundermeyer [1] und von uns [2] untersucht wor­ den. Ein Ziel unserer Arbeiten war es, das D onor­ verhalten dieser Systeme gegenüber Fluor-Lewis-Säuren (AsF5, SbF5, BF3) zu untersuchen und die Grenzen zwischen Carbenium-, Sulfoniumsalz-und Addukt-Bildung zu erkennen. Durch Strukturun­ tersuchungen konnte belegt werden, daß AsF5 aus F2CSCF2S F " abstrahiert unter Bildung des cycli­ schen Carbeniumions FCSC F2S+ [lb]; nach IR-und 1' 9F-N M R -U ntersuchungen führt die analoge Umsetzung von F 7SCF?S(0")C F7 (n = 0 -2) zu Sul-foniumsalzen FSC F2S(0")CF2+ [lc], während in Sulfoxid-Derivaten die Lewis-Säure an den Sauer­ stoff unter Bildung von F 2CS(0")CF2S 0 • M F 5 (n = 0 -2) addiert wird. In der vorliegenden Arbeit be­ richten wir über die Struktur des Adduktes F2C S 0 2C F2S 0 • A sF5 (2 a). 
  Reference    Z. Naturforsch. 49b, 422—424 (1994); eingegangen am 21. Oktober 1993 
  Published    1994 
  Keywords    Dithietanes, Sulfoxides, Adducts with Lewis-Acids, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0422_n.pdf 
 Identifier    ZNB-1994-49b-0422_n 
 Volume    49 
15Author    Andreas Ahle, K. Urt Dehnicke, CäciliaM. Aichle-Mössmer, Joachim SträhleRequires cookie*
 Title    Synthesis and Crystal Structure of [Na( 12-Crown-4)2]2[Fe4Se4Cl4]  
 Abstract    [N a(12-crow n-4)2]2[Fe4Se4Cl4] has been pre­ pared by the reaction o f FeCl2 with N a2Se4 in di-methylform amide solution in the presence o f 12-crown-4 as dark red crystals, which were char­ acterized by a_ crystal structure determination. Space group P 1, Z = 2, 6295 observed unique re­ flections, R = 0.085. Lattice dim ensions at 20 °C: a = 1397.3(3), b = 1501.8(4), c = 1570.1(4) pm, a = 85.86(2)°, ß = 64.06(2)°, y = 65.01(2)°. The structure consists o f [Na(12-crown-4)2]+ cations and cuban-like anions [Fe4Se4Cl4]2" with Fe — Fe contacts o f 282.8(3) pm. 
  Reference    Z. Naturforsch. 49b, 434 (1994); eingegangen am 30. September 1993 
  Published    1994 
  Keywords    Tetranuclear Iron Selenium Cluster Dianion, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0434_n.pdf 
 Identifier    ZNB-1994-49b-0434_n 
 Volume    49 
16Author    Wolfgang Blase, Gerhard Cordier, Matthias Ludwig, Rüdiger KniepRequires cookie*
 Title    Sr3[Al2N 4l: Ein Nitridoaluminat mit gewellten Tetraederketten * [AlN4/23 ] Sr3[Al2N 4]: A Nitridoaluminate with Corrugated Tetrahedral Chains j,[AlN4/23_]  
 Abstract    Sr3[Al2N 4] (Pnna, Nr. 52; a = 590.1(3), b = 1000.5(5), c = 958.0(4) pm; Z = 4) was prepared from the elements (m olar ratio Sr: A1 = 3:1; reaction with N 2, 1 atm, 24 h; Tmax = 1 1 0 0 °C). The crystal structure contains corrugated chains ifA lN ^ 3'] which consist of distorted A1N4 tetrahedra sharing com mon edges (A l-N : 188.5(7)-195.8(7) pm; N -A l-N : 95.0(3)-126.0(5)°). The nitrogen atom s form a distorted ccp arrangement. 3/4 of the octahedral holes are occupied by Sr atoms; 1 /4 o f the tetrahedral holes are occupied by A1 atoms. Sr3[Al2N4] can be described in terms o f the Zintl concept (isosteric relation of [AIN,]3-to SiS-,). 
  Reference    Z. Naturforsch. 49b, 501—505 (1994); eingegangen am 22. November 1993 
  Published    1994 
  Keywords    N itridoalum inate, Tetrahedral Chain-Anions, Preparation, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0501.pdf 
 Identifier    ZNB-1994-49b-0501 
 Volume    49 
17Author    G. Tams, Hk Miiller-BuschbaumRequires cookie*
 Title    A Contribution to the Crystal Chemistry of Alcaline Alealine Earth Precious Metal Perovskites. Synthesis and Crystal Structure of NaBa4Cuo,5Pti,50 8  
 Abstract    Single crystals of the phase NaBa4Cu0 5P t1 s0 8 were prepared in closed silver tubes. The black and moisture sensitive crystals were investigated by four-circle diffractometer X-ray tech­ niques. They show trigonal symmetry, space group D2-P321, a = 10.0644, c = 8.3811 A, Z = 3 and belong to the perovskites. The typical M20 9 double octahedra are occupied by Pt4+ and Cu2+ in a different manner. Na+ is partly in and out of the centres of trigonal prisms of oxygen. These features will be discussed with respect 
  Reference    Z. Naturforsch. 49b, 585—588 (1994); eingegangen am 12. Januar 1994 
  Published    1994 
  Keywords    Sodium, Barium, Copper, Platinum, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0585.pdf 
 Identifier    ZNB-1994-49b-0585 
 Volume    49 
18Author    C. U., D. Osterloh, Hk Müller-BuschbaumRequires cookie*
 Title    Das erste Oxocuprat/-Arsenat mit Kupfer in gemischter Valenz  
 Abstract    ,56C u o , 4 4) C u (A s 0 4)3 The First O xocuprate/Arsenate Containing Mixed Valent Copper: Cu(Mg2.56Cu0.44)C u(A sO4) 3 Single crystals of Cu(Mg2 56Cu0 44)C u (A s0 4)3 have been prepared by C 0 2-LASER technique and investigated by X-ray diffraction methods. The light blue crystals show monoclinic sym­ metry, space group C2h-C 2/c, a = 11.897, b = 12.855, c -6.688 A, ß = 113.06°, Z = 4. The structure type is characterized by A s 0 4 tetrahedra, dumb-bell-like coordinated Cu(I), twisted C u 0 4 square polygons and octahedra statistically occupied by Mg/Cu2+. 
  Reference    Z. Naturforsch. 49b, 589—592 (1994); eingegangen am 14. Januar 1994 
  Published    1994 
  Keywords    Magnesium, Copper, Arsenic Oxide, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0589.pdf 
 Identifier    ZNB-1994-49b-0589 
 Volume    49 
19Author    Klaus StöweRequires cookie*
 Title    Zur Struktur und Dotierung von Selenosilikaten: die Kristallstruktur von Er2S e S i0 4 und Er3 75Ca0 25Se2 75C10 25Si20 7 Structure and Doping of Seleno Silicates: the Crystal Structures of Er2SeSi04 and E r3 7^CaQ 2$Se2 ^C Iq ^Si^O-y  
 Abstract    Well-shaped brown and pink isometric crystals were obtained as by-products o f the syn­ thesis o f erbium selenides from the elements in evacuated and sealed silica ampoules with graphite inlets. They could be identified as erbium seleno m ono-and disilicates by energy dis­ persive X-ray fluorescence and X-ray structure determination. The monosilicate Er2S e S i0 4 crystallizes isotypically to N d 2S e S i0 4 in the space group Pbcm with the lattice parameters a = 600.2(2), b = 688.0(2), c = 1075.2(2) pm and represents the second known seleno inosilicate o f the rare earths. From X-ray structure analysis an isotypic relation between the disilicate Er3 75Ca0 25Se2 75C10 25Si20 7 and the com pound Sm4S3Si2O v was found, the former crystallizing in the space group 14,/am d with the lattice parameters a -1177.7(2) and c = 1376.5(2) pm. The doping o f the sorosilicate with the elements Ca and Cl originated from contam inations in the graphit inlets used in the procedure. 
  Reference    Z. Naturforsch. 49b, 733—7 (1994); eingegangen am 13. Januar 1994 
  Published    1994 
  Keywords    Erbium Seleno Silicates, Crystal Structures, Doping Effects 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0733.pdf 
 Identifier    ZNB-1994-49b-0733 
 Volume    49 
20Author    S. Möhr, Hk Müller-BuschbaumRequires cookie*
 Title    Ein gemischtvalentes Oxometallat mit Cr3+ anstelle von Ti3+: Ba2Ti4+Cr20 13  
 Abstract    Single crystals of Ba2Ti4+C r20 13 w ere p rep a red by C 0 2-L A S E R h igh te m p era tu re r ea ctio n s and in v estig a te d by X -ra y w o rk . T h e c o m p o u n d c ry sta llize s w ith m o n o c li­ nic sym m etry, a = 15.0 1 8 5 , b = 3 .9 4 1 9 , c -9 .0 7 6 4 Ä , ß = 9 8 .1 3 7 °, Z = 2. B a 2T i4Cr20 13 is iso ty p ic to N a 2T i60 13. T h e crystal stru ctu re is d isc u sse d w ith r e sp e ct to o rd ered or d iso rd ered d istrib u tio n s o f T i4+ and C r3+ u sin g c a lc u la tio n s o f C o u lo m b term s o f la ttice energy. It is sh o w n , th at th e sta b ility o f th is stru ctu re ty p e w ill b e d e c r e ­ ased by rep la ce m en t o f N a + by io n s w ith h ig h er o x id a tio n sta tes. 
  Reference    Z. Naturforsch. 49b, 911 (1994); eingegangen am 17. Februar 1994 
  Published    1994 
  Keywords    Barium, Titanium, Chromium, Oxide, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0911.pdf 
 Identifier    ZNB-1994-49b-0911 
 Volume    49 
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