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1994[X]
61Author    Requires cookie*
 Title    Einfache Synthese von 2,2-Diethoxy-2,5-dihydrofuranen, 2(5 H)Furanonen und 2-Ethoxy-furanen. Kristall-und Molekülstruktur eines Barrelenon Diels-Aider Produktes [1]  
  Reference    Z. Naturforsch. 49b, 389 (1994) 
  Published    1994 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0389.pdf 
 Identifier    ZNB-1994-49b-0389 
 Volume    49 
62Author    Janusz Stępiński, S.William TamRequires cookie*
 Title    New Dimeric Tetrapeptide Enkephalin Analogues Hydrophilic Spacer Length and Configuration Affects Potency and Receptor Selectivity  
 Abstract    Bivalent Opioids, Enkephalin Analogues, Opioid Receptor Selectivity Three new bivalent opioid peptide analogues, l,3-di-(tyrosyl-D-alanyl-glycyl-phenyl-alanylamido)-2-propanol, 1,4-di-(tyrosyl-D-alanyl-glycyl-phenylalanylamido)-(2 R, 3 S)-bu-tanediol and l,4-di-(tyrosyl-D-alanyl-glycyl-phenylalanylamido)-(2i?,3i?)-butanediol, were synthesized and tested in vitro for pi, d and x receptor affinities. They were found to have potent opioid receptor binding activity. The (25,35)-butanediol bridge configuration yield­ ed selectivity and high potency for pi and x receptors, while the (2/?,37?)-butanediol bridge configuration yielded high potency and selectivity for < 3 receptors. It thus appears that changes in the length and configuration of the polyhydroxyl bridge in dimeric enkephalin analogues can produce a shift in receptor selectivity profiles and therefore suggest the possibility of developing more selective drugs. 
  Reference    Z. Naturforsch. 49b, 407—411 (1994); received September 91993 
  Published    1994 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0407.pdf 
 Identifier    ZNB-1994-49b-0407 
 Volume    49 
63Author    MichaelW. Zenke, Karl HensenRequires cookie*
 Title    Phasendiagramme und Exzeßvolumina der Systeme (CH^SiCK/Pvridin und (CH3)2CC12/Pyridin  
 Abstract    The isobaric melting and boiling diagrams for the systems: dimethyldichlorosilane/pyridine and 2,2-dichloropropane/pyridine are reproduced. The existence of the incongruently melting addition compounds (CH3)2SiCl2 (Pyridine)2 and [(CH3)2CC12]3 • Pyridine could be proved. Some measurements of the molar volume of mixtures of pyridine and dimethyldichlorosilane, and pyridine and 2,2-dichloropropane are reported. For both systems the molar excess vol­ ume has been calculated as a function of the mole fractions. 
  Reference    Z. Naturforsch. 49b, 412—416 (1994); eingegangen am 20. September 1993 
  Published    1994 
  Keywords    Phase Diagrams, Pyridine, Dimethyldichlorosilane, 2, 2-Dichloropropane, Excess Volumes 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0412.pdf 
 Identifier    ZNB-1994-49b-0412 
 Volume    49 
64Author    Requires cookie*
 Title      
 Abstract    Further investigation revealed that to obtain good yields of (II) from 4-methoxybenzaldehyde there was a requirem ent for two equivalents of ITCS. Overall, the reaction is summarized by equa­ tion (1), which represents a unique way of directly carrying out a fundamental transform ation, that of aldehydes to secondary amides. 
  Reference    Z. Naturforsch. 49b, 417 (1994) 
  Published    1994 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0417.pdf 
 Identifier    ZNB-1994-49b-0417 
 Volume    49 
65Author    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 
66Author    Kurt Merzweiler, Laurent Weisse, Harald KrausRequires cookie*
 Title    Synthese und Kristallstraktur von [{Cp(CO)2Fe}2Sn(F)FBF3] Synthesis and Crystal Structure of [{Cp(CO)2Fe}2Sn(F)FBF3]  
 Abstract    Tin, Tetrafluoroborate, Crystal Structure [{Cp(CO)2Fe}2SnCl2] reacts with AgBF4 to form [{Cp(CÖ)2Fe}2Sn(F)FBF3] 1.1 crystallizes in two monoclinic modifications with a = 1018.2(4), b = 1321.1(5), c = 1364.8(5) pm, ß = 104.96(4)° (la), and a = 983.1(2), b = 1760.2(6), c = 1060.4(3) pm, ß = 104.28(2)° (lb), la and lb con­ tain a nearly tetrahedrally coordinated tin atom which is bonded to two {Cp(CO)2Fe} fragments, a F atom and a BF4 group. 
  Reference    Z. Naturforsch. 49b, 425—129 (1994); eingegangen am 23. August 1993 
  Published    1994 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0425_n.pdf 
 Identifier    ZNB-1994-49b-0425_n 
 Volume    49 
67Author    Hans-Dieter Hausen, Jochen Tödtmann, Johann WeidleinRequires cookie*
 Title    The X-Ray Structure Determ ination of the Pyrrolides (C H 3)2A 1 -C 4H 3N CH 3 and (C H 3)2Ga -N (CCH3)4  
 Abstract    Pyrrolides, D im ethylm etal D erivatives, X -R ay N-M ethyl-2-dim ethylalum inium pyrrolide, (C H 3)2A 1 -C 4H 3N C H 3, crystallizes in the triclinic space group PT with the lattice constants a = 700.5(1), b = 725.9(1), c = 886.8(1) pm, a = 67.69(1)°, ß = 70.99(1)°, y = 88.48(1)°, and Z = 2. This com pound is isotypic with the gallium ho-m ologue [1], the shortest metal-ring contact b e ­ tw een the two m olecules of one unit cell decreases to 228.6 pm. N-dim ethylgallium 
  Reference    Z. Naturforsch. 49b, 430 (1994); eingegangen am 20. Oktober 1993 
  Published    1994 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0430_n.pdf 
 Identifier    ZNB-1994-49b-0430_n 
 Volume    49 
68Author    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 
69Author    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 
70Author    AlexanderV. Sienkiewicz, AnatoliyA. KapshukRequires cookie*
 Title    The Crystal Structure of the Tetrameric Adduct of Antimony Trichloride and Phosphoryl Isothiocyanate, [SbCl3'OP(NCS)3]4  
 Abstract    ,1993 X-Ray, Antimony Trichloride-Phosphoryl Isothiocyanate The crystal and molecular structure of the tetrameric complex of the composition [SbCl3-OP(NCS)3]4 synthesized from SbCl3 and OP(NCS)3 in CC14 waso determined by X-ray crystallography [143 m space group, cubic system with a = 13.927(4) Ä]. The complex exhibits a tetranuclear "cage" structure with a [Sb40 4] core which consists of ^-bridging oxy­ gen and six coordinate antimony(III) atoms; the S b-O distance, 3.060 Ä, is exceptionally long. 
  Reference    Z. Naturforsch. 49b, 441—444 (1994); received September 13 
  Published    1994 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0441.pdf 
 Identifier    ZNB-1994-49b-0441 
 Volume    49 
71Author    Requires cookie*
 Title    Zur Chemie der l,3»5-Triaza-2-phosphorinan-4,6-dione. Teil VIII*. Weitere l,3,5-Triaza-2 A3-und l,3,5-Triaza-2 A4-phosphorinan-4,6-dione mit (2-Chlorethyl)amino-und Bis(2-chlorethyl)amino-Substituenten  
  Reference    Z. Naturforsch. 49b, 445 (1994) 
  Published    1994 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0445.pdf 
 Identifier    ZNB-1994-49b-0445 
 Volume    49 
72Author    Bernhard Rieger, Gerhard Jany, M.Anfred Steimann, Riad FawziRequires cookie*
 Title    Synthesis of Ethylene Bridged Biscyclopentadiene Ligand Precursor Compounds and Some of their a/isa-Zirconocene Derivatives via Chiral Epoxides: A Synthetic Strategy of High Variability  
 Abstract    The chiral ligand precursor systems [l-C p M -R '-2 -R 2-2-Cp2]ethane 5 a -d bearing two dif­ ferent cyclopentadienyl fragments (C p1, Cp2 = Cp, Ind, Flu) and a variable bridge substitu­ tion pattern (R 1, R2 = H, Ph, cyclopentyl, cyclohexyl) were prepared starting from the corre­ sponding epoxides. The solid state structures o f six organic intermediates are reported in order to prove the stereochemistry o f the ligand form ing reactions. Treatment o f the dilithio salts o f 5a~d with ZrCl4 in C H 2C12 afforded chiral a«sa-zirconocene dichlorides (6a-d). 
  Reference    Z. Naturforsch. 49b, 451 (1994); eingegangen am 20. Oktober 1993 
  Published    1994 
  Keywords    Chiral Epoxides, Fluorenyl A lcohols, Spirocyclopropanes, Biscyclopentadienes, Chiral ansa-Zirconocene Dichlorides 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0451.pdf 
 Identifier    ZNB-1994-49b-0451 
 Volume    49 
73Author    Michael Geschwentner, G. Ernot Elter, Anton MellerRequires cookie*
 Title    Supermesityl-substituierte Hydrazinoborane Supermesityl-Substituted Hydrazinoboranes  
 Abstract    Difluoro(supermesityl)borane reacts with monolithiated hydrazines to give the correspond­ ing fluoroborylated hydrazines la -c , which could not be dehydrofluorinated to yield definite products. From dilithiated hydrazine the 1,2-borylated species 2 was obtained. The fluoro-borylhydrazones 3 a-3 d prepared in an analogous way, by dehydrofluorination with tert-butyllithium, led to 5-, 6-and 7-membered boron nitrogen heterocycles depending upon the substituents of the hydrazones. 
  Reference    Z. Naturforsch. 49b, 459 (1994); eingegangen am 23. Januar 1994 
  Published    1994 
  Keywords    Hydrazine, Hydrazones, Difluoro(superm esityl)borane, Hydrazinoboranes, Boron-Nitrogen Heterocycles 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0459.pdf 
 Identifier    ZNB-1994-49b-0459 
 Volume    49 
74Author    H. Schulz, H. Seyffer, B. Deobald, H. Pritzkow, W. SiebertRequires cookie*
 Title    New Organoboran Heterocycles: Benzo-l,4-diboracycloheptene-2, 1,4-Diboracyclopentene-2 and the Isomeric 6,6-Dimethyl-2-methylidene-l,3-diboracyclohexane  
 Abstract    2,3-B enzo-1,4-diboracycloheptene-2, 1,4-Diboracycloheptene-2, 6.6-Dim ethyl-2-m ethylidene-1,3-diboracyclohexane 
  Reference    Z. Naturforsch. 49b, 465 (1994); eingegangen am 19. N ovem ber 1993 
  Published    1994 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0465.pdf 
 Identifier    ZNB-1994-49b-0465 
 Volume    49 
75Author    A. Franken, W. PreetzRequires cookie*
 Title    Darstellung, UB-, 13C-NMR-und Schwingungsspektren von Cyanomethylhexahydro-closo-Hexaborat(  
 Abstract    l-), |B6H6(CH2CN)]~ sowie Kristallstruktur von IP(C6H5)41[B6H6(CH2CN)] Preparation, "B, ,3C N M R and Vibrational Spectra of Cyanomethylhexahydro-closo-hexaborate(l-), [B6H 6(C H2CN)]", and the Crystal Structure o f [P(C6H 5)4][B6H 6(C H 2CN)] Cyanom ethylhexahydro-closo-hexaborate(l-), Crystal Structure, "B N M R Spectra, Vibrational Spectra By reaction o f [B6H 6]2~ with chloroacetonitrile in dichloromethane the cyanomethylhexahy-dro-closo-hexaborate(l-), [B6H6(C H 2CN)]~ is formed. The com pound has been separated from excess [B6H6]2~ by ion exchange chromatography on diethylaminoethyl cellulose. The crystal structure o f [P(C6H 5)4][B6H 6(C H 2CN)] has been determined by single crystal X-ray dif­ fraction analysis; triclinic, space group P I with a = 7.503(3), b = 12.0949(8), c = 14.6572(11)A, a = 79.399(6)°, ß = 79.19(2)°, y = 89.2(2)°. The "B N M R spectrum is consist­ ent with a mono hetero substituted octahedral B6 cage. In the 13C N M R spectrum o f Cs2[B6H 5(CH 2CN)] a singlet at 131.9 ppm (C N) and a quartet at 2.97 ppm with 'J(C,B) = 54.7 Hz (C H 2) are observed. The IR and Raman spectra exhibit a very strong CN stretching band at 2218 c m '1. 
  Reference    Z. Naturforsch. 49b, 471—4 (1994); eingegangen am 2. N ovem ber 1993 
  Published    1994 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0471.pdf 
 Identifier    ZNB-1994-49b-0471 
 Volume    49 
76Author    AndrewL. Hectora, IvanP P ArkinRequires cookie*
 Title    Transition Metal Pnictide Synthesis: Self Propagating Reactions Involving Sodium Arsenide, Antimonide and Bismuthide  
 Abstract    Initiation o f the reaction between N a 3E (E = As, Sb, Bi) and anhydrous metal halides at 25 to 550 °C produces metal arsenides M vA sv (M = Y , La, Ti, Hf, V, N b, Ta, Cr, M o, W, Mn, Fe, Co, N i, Pt, Cu and Zn) and antimonides M vSbv (M = Ti, V, Nb, Ta, Cr, Fe, Co, N i, Pt, Cu and Zn) via an exothermic selfpropagating reaction. The metal arsenides were characterized by X-ray powder diffraction, SE M /E D A X , microanalysis and FT-IR. 
  Reference    Z. Naturforsch. 49b, 477 (1994); received November 29 1993 
  Published    1994 
  Keywords    Metal Arsenide, Sodium Arsenide, Metal Antim onide, Sodium Antimonide, Solid State M etathesis 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0477.pdf 
 Identifier    ZNB-1994-49b-0477 
 Volume    49 
77Author    Ralph Bergs, Rostislav Lampeka, Christian Robl, Wolfgang BeckRequires cookie*
 Title    Halbsandwichkomplexe von Iridium(III) und Ruthenium(II) mit Dianionen von 2-Hydroxyiminocarbonsäuren Metal Complexes of Biologically Im portant Ligands, LXXII [1] Half Sandwich Iridium(III) and R uthenium (II) Complexes with Dianions of 2-Hydroxyiminocarboxylic Acids  
 Abstract    Iridium, Ruthenium, 2-Oxyiminocarboxylate, Pentamethylcyclopentadienyl, p-Cymene Chiral chelate complexes with dianions of 2-hydroxyiminocarboxylic acids (M5-Cp*)(Do)Ir-N(0)=C(R)C02 (1) und (^6-p-cymene)(Do)Ru-N(0)=C(R)CQ7 (2) are obtained by deprotonation of the compounds (/z5-Cp*)(Cl)Ir-N(0H)=C(R)C02 and (/z6-p-cymene)(Cl)Ru-N(0H)=C(R)C02 in the presence of a donor ligand (Do = PR3, P(OMe)3, py). The structure of (/r''-Cp*)(Me3P)Ir-N(0)=C(M e)C02 has been determined by X-ray diffraction. Metallkomplexe mit biologisch wichtigen Liganden, LXXII [1] 
  Reference    Z. Naturforsch. 49b, 483—488 (1994); eingegangen am 16. Dezember 1993 
  Published    1994 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0483.pdf 
 Identifier    ZNB-1994-49b-0483 
 Volume    49 
78Author    C. Müller+, P. BöttcherRequires cookie*
 Title    Darstellung und Kristallstruktur des Bis(trimethylammonium)hexasulflds [HN(CH3)3]2S6 Preparation and Crystal Structure of Bis(trimethylammonium)hexasulfide [HN(CH3)3]2S6  
 Abstract    The reaction of trimethylamine, H 2S, and sulfur in ethanol yields orange crystals of bis(tri-methylammonium)hexasulfide. The com pound crystallizes in the centrosym m etric m ono­ 
  Reference    Z. Naturforsch. 49b, 489—493 (1994); eingegangen am 26. August 1993 
  Published    1994 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0489.pdf 
 Identifier    ZNB-1994-49b-0489 
 Volume    49 
79Author    WolfPeter Fehlhammer, Thomas Bliß, Wilfried Sperber, Joachim FuchsRequires cookie*
 Title    Homoleptische Carbenkomplexe, V [1] Chelatartige Percarbenkomplexe des Palladiums und Platins Homoleptic Carbene Complexes, V [1] Chelating Percarbene Complexes of Palladium and Platinum  
 Abstract    Ten palladium and platinum complexes each containing two chelating bis(diaminocarbe-ne) ligands have been synthesized in a one pot-reaction from P dl2, P tl2 or K2PtCl4, a tenfold excess (forty equivalents) of isocyanide and 1,2-or 1,3-diamines. A n X-ray investigation of 
  Reference    Z. Naturforsch. 49b, 494—500 (1994); eingegangen am 10. N ovem ber 1993 
  Published    1994 
  Keywords    Isocyanide Complexes, Reactions at Coordinated Ligands, Chelating Bis(diam inocarbene) Ligands, X-Ray 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0494.pdf 
 Identifier    ZNB-1994-49b-0494 
 Volume    49 
80Author    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 
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