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'Crystal Structure' in keywords Facet   section ZfN Section B:Volume 045  [X]
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1990 (18)
1Author    Siegfried PohlRequires cookie*
 Title    Thioharnstoff-Derivate als Liganden in  
 Abstract    Eisen-Komplexen: Synthese und Kristallstrukturen von [FeI2L2l, [Fe2I4L3], (L -L) 2+|FeI4-| 2 (L = (M e2N)2CS) und |Fe2I4(C6H l0(N H -C S -N H M e)2)2| mit einer Notiz zu [FeIL3]+|Fe4S4I3L]-T hiourea D erivatives as Ligands in Iro n Complexes: Syntheses and C rystal Structures o f [F eI2L2], [ F e J 4 L3], (L -L) 2 +[FeI4-] 2 (L = (M e2N)2CS) an d [Fe2I4(C 6H 10(N H -C S -N H M e) 2)2] and a N o te on [F eIL 3]+[F e4S4I3L]~ U lrich Bierbach, W olfgang Saak, D etlev H aase u nd [FeI2L2] (1) and [Fe2I4L3] (2) are obtained from the reaction o f F e l2 and 
  Reference    (Z. Naturforsch. 45b, 45 [1990]; eingegangen am 26 Juli / 18. September 1989) 
  Published    1990 
  Keywords    Thiourea Complexes, Iron C om pounds, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/45/ZNB-1990-45b-0045.pdf 
 Identifier    ZNB-1990-45b-0045 
 Volume    45 
2Author    Sabine Paashaus, R. Üdiger, K. NiepRequires cookie*
 Title      
 Abstract    The pseudobinary systems E T e-E T eH a l (E/H al = A l/I,Br; G a/I.B r,C l; In/I,Br) contain the intermediate phases E3Te3Hal, having incongruent melting behavior (decom position at temperatures between 386 °C and 718 °C). The crystal structures (orthorhombic, Pnma) o f the isotypic ternary phases contain one-dim ensional macrom olecules, in which (Te3 3EInHal)-tetrahedra and (Te3 3G a2nTe3/3) units (staggered conform ation) are linked by com m on T e -T e -edges. The macromolecules can be described in terms o f fragments o f an ETe-crystal structure o f the GaTe structural type. In this way, halogen acts as an oxidizing agent which then satu­ rates the free valence at the Em positions. Larger fragments o f a respective ETe-crystal struc­ ture are expected to be present in the crystal structure o f InTeC lv (x ~ 0.16) which is an inter­ mediate phase (m.p. = 418 °C; incongruent) in the quasibinary system In T e-In T eC l. 
  Reference    Z. Naturforsch. 45b, 667—6 (1990); eingegangen am 6. N ovem ber 1989 
  Published    1990 
  Keywords    Phase Relations, Crystal Structure, Mixed Valency Phases 
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 TEI-XML for    default:Reihe_B/45/ZNB-1990-45b-0667.pdf 
 Identifier    ZNB-1990-45b-0667 
 Volume    45 
3Author    WolfgangA H Errm Ann, JosefK. Felixberger, JosefG. Kuchler, Eberhardt HerdtweckRequires cookie*
 Title    Alkin-Komplexe des Rheniums in hohen Oxidationsstufen Alkyne Complexes of Rhenium in High Oxidation States  
 Abstract    The class o f ^-alkyne complexes o f metals in medium and high oxidation states has been extended by the type C H 3R e 0 2(R C = C R) (3a-i). Exchange o f alkyne for oxo ligands under reducing conditions has been employed as a new general synthesis. C om pounds 3 are thus ob­ tained by reaction o f methyltrioxorhenium(VII) (1) with the alkynes 2 a -i in the presence o f a ca. 1.1-fold molar amount o f polymer-bound triphenylphosphane as reducing agent ( 
  Reference    Z. Naturforsch. 45b, 876—8 (1990); eingegangen am 30. N ovem ber 1989 
  Published    1990 
  Keywords    M ethyloxorhenium Alkynes, Synthesis, Crystal Structures 
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 TEI-XML for    default:Reihe_B/45/ZNB-1990-45b-0876.pdf 
 Identifier    ZNB-1990-45b-0876 
 Volume    45 
4Author    R. J. Schubert, K.-J RangeRequires cookie*
 Title    T etra-w-butylammoniumdicyanoaurat(I), (/j-C4H9)4N Au(CN)2 Tetra-/7-butylammonium Dicyanoaurate(I), (az-C4H9)4N A u(C N)2  
 Abstract    Single crystals o f (/j-C4H9)4N A u (C N) 2 were obtained by crystallization using the tempera­ ture decreasing method in a newly developed com puter-controlled apparatus. The colourless crystals aor e monoclinic, space group A 2/n, with a = 20.216(2) Ä, b = 13.130(1) A, c = 9.328(1) A, and ß = 109.69(1)°. The measured density is 1.45 g/cm 3, which agrees with the cal­ culated density o f 1.40 g/cm 3 for Z = 4. The structure was solved by Direct M ethods using 674 independent reflections and refined by least-squares procedures to conventional and weighted R factors o f 0.068 and 0.058, respectively. The nearly linear [A u(C N)2]~-anions form pseudo-hexagonal layers, in which they are arranged parallel to each other. The shortest A u -A u dis­ tance is 8.05 A. The stacking o f the layers produces pseudo-trigonal channels, occupied by the cations. The tetra-«-butylammonium cation has four ordered trans chains with idealized D 2d symmetry (42 m). 
  Reference    Z. Naturforsch. 45b, 1118—1122 (1990); eingegangen am 12. Februar 1990 
  Published    1990 
  Keywords    Tetra-«-butylammonium Dicyanoaurate(I), Crystal Growth, Crystal Structure 
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 TEI-XML for    default:Reihe_B/45/ZNB-1990-45b-1118.pdf 
 Identifier    ZNB-1990-45b-1118 
 Volume    45 
5Author    Michael Schäfer, Jürgen Pebler, Beatrice Borgsen, Frank Weller, K. Urt DehnickeRequires cookie*
 Title    21Sb-Mössbauer-spektroskopische und strukturchemische Untersuchungen an Kronenetherkomplexen SbX3(15-Krone-5) mit X = F, Cl, Br, I. Eine Analyse der Orbitalbesetzungszahlen 12lSb-M össbauer-Spectroscopic and Structural Investigations on Crown Ether Complexes SbX3(15-Crown-5) with X = F, Cl, Br, I. A Population Analysis Crown Ether C om plexes SbX3(15-crown-5)  
 Abstract    The crown ether complexes SbX3(15-crown-5) with X = F, Cl, Br, and I have been prepared by reactions o f 15-crown-5 with the corresponding antimony trihalides in acetonitrile solu­ tions. The com pounds were characterized by IR spectroscopy as well as by l21Sb-M össbauer spectroscopy. A m ethod o f orbital population analysis utilizing both M össbauer isomer shifts and quadrupole coupling has been developed for Sb(III) antimony halides and their crown ether com plexes. SbF 3(l 5-crown-5) was also characterized by an X-ray structure determination: Space group P 2 ,/«, Z = 4, 3628 observed unique reflexions, R = 0.032. Lattice dim ensions at 19 °C: a = 891.54(6), b = 1277.26(6), c = 1277.66(7) pm, ß = 95.029(4)3. The com plex has a molecular structure in which the antimony atom is surrounded by three F-atom s with mean bond lengths o f 192.4 pm and by the five oxygen atom s o f the crown ether molecule with mean bond lengths o f 293.9 pm. 
  Reference    Z. Naturforsch. 45b, 1243—1250 (1990); eingegangen am 5. März/9. Mai 1990 
  Published    1990 
  Keywords    Syntheses, IR Spectra, 12lSb-M össbauer Spectra, Crystal Structure 
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 Identifier    ZNB-1990-45b-1243 
 Volume    45 
6Author    Dirk Johrendt, Albrecht MewisRequires cookie*
 Title    Darstellung und Kristallstruktur der Verbindungen SEPdP (SE = Seltenerdelement) Preparation and Crystal Structure of SEPdP C om pounds (SE = Rare Earth Element)  
 Abstract    The new compounds SEPdP (SE = L a -G d), which were prepared by heating the elements, crystallize with a modified N i2In-type structure. The phosphides o f SE = D y -L u attain the orthorhombic TiNiSi-type structure. A comparison o f the cell volumes suggests that europium has intermediate valence in EuPdP. 
  Reference    Z. Naturforsch. 45b, 1262—1266 (1990); eingegangen am 19. März 1990 
  Published    1990 
  Keywords    Rare Earth Elements, Palladium, Phosphides, Crystal Structure 
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 Identifier    ZNB-1990-45b-1262 
 Volume    45 
7Author    Siegfried Pohl, W. Olfgang Saak, R. Ain, Er Lotz, Detlev HaaseRequires cookie*
 Title    Zur Existenz schwacher Wechselwirkungen zwischen Sb(III) und Phenylgruppen: Sb2 Br6 (SPPh3)2, Sb2 I6 (SePPh3 ) 2 * 2 CH2 C12, Sb4 Br12(SPM e2 Ph) 4 und (Ph4 P)2 Sb2 Br8 * CH3CN  
 Abstract    On the Existence o f W eak In teractio n s between Sb(III) and Phenyl G roups: Sb2Br6(SP Ph3)2, Sb2I6(SeP Ph3)2 • 2 C H 2C12, Sb4B r12(SPM e2Ph)4 and (Ph4P)2Sb2Br8 • C H 3CN The com pounds Sb2Br6(SPPh3)2 (1), Sb2I6(SePPh3)2-2 C H 2C12 (2), and Sb4Br12(SPMe2Ph)4 
  Reference    Z. Naturforsch. 45b, 1355 (1990); eingegangen am 6. März 1990 
  Published    1990 
  Keywords    Sb(III)-Phenyl Interaction, Antimony Trihalides, Crystal Structure 
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 TEI-XML for    default:Reihe_B/45/ZNB-1990-45b-1355.pdf 
 Identifier    ZNB-1990-45b-1355 
 Volume    45 
8Author    H. Einz, Jürgen Beister, K. Arl Syassen, Jürgen KleinRequires cookie*
 Title    Phase Transition of N a3As under Pressure  
 Abstract    We have investigated the high pressure behaviour of N a3As by powder X-ray diffraction. At 3.6 G Pa the material undergoes a reversible phase transition from the N a3As structure (P 6 3/ mmc, a = 487.4(8) pm, c = 851.5(20) pm, Z = 2, at 3.6 G Pa) to the Li3Bi structure type (Fm 3m , a = 683.5(15) pm, Z = 4, at 3.6 GaP). The equation of states is given for the pressure range up to 26 GPa. Results are discussed with respect to structural properties of related A3BV-compounds. 
  Reference    Z. Naturforsch. 45b, 1388—1392 (1990); received M arch 7 1990 
  Published    1990 
  Keywords    High Pressure, Crystal Structure, Phase Transition 
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 Identifier    ZNB-1990-45b-1388 
 Volume    45 
9Author    Dietm Ar Stalke, Ursula Pieper, Susanne Vollbrecht, Uwe KlingebielRequires cookie*
 Title    Lithium-Iminofluorsilan und Natriumfluorsilylamid -ein Vergleich Lithium-Iminofluorosilane and Sodium-Fluorosilylamide -a Com parison  
 Abstract    The metalation o f 2,4,6-trw m -butylam ino-te/'/-butylfluorom ethylsilane (1) with butyl-lithium leads to the formation o f the LiF adduct o f the iminosilane 2. In 2 the silicon atom is pentavalent and four-coordinated. The corresponding sodium com pound is the fluorosilyl-amide 3. The nitrogen has a planar environment in 3. 
  Reference    Z. Naturforsch. 45b, 1513—1516 (1990); eingegangen am 27. Dezember 1989/8. März 1990 
  Published    1990 
  Keywords    Iminosilane, Sodium-Fluorosilylamid, Crystal Structure, Lithium-Iminofluorosilane 
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 TEI-XML for    default:Reihe_B/45/ZNB-1990-45b-1513.pdf 
 Identifier    ZNB-1990-45b-1513 
 Volume    45 
10Author    Rolf Minkwitz, AndreasK. Ornath, Renate Krause, Hans PreutRequires cookie*
 Title    Über die Darstellung der  
 Abstract    (Chlorthio)sulfoniumsalze [(CH3)2SSSC l]+SbF6-, I(CH3)2SSCI]+SbF6-und des isomeren [(CH3)(C I)S -S C H 3]+SbCl6-[ l ] On the Preparation o f the (Chlorothio)sulfonium Salts [(CH3):SSSCl]+SbF6-, [(CH3),SSCl]+SbF6-and the Isomer [(CH3)(C l)S -S C H 3]+SbCl6-[1] The preparation o f the stable com pounds [(CH3)2SSCl]+SbF6~ and [(CH3)2SSSCl]+SbF6~ from [(CH3)2SH ]+SbF6~ and SC12 and S2C12, resp., is reported. The isomer [(CH3)(C l)S -S C H 3]+SbCl6" is prepared from [SCl3]+SbCl6~ and CH,SH in the molar ratio 1:2. For this salt a crystal structure analysis was carried out (Space group P 2,2,2,, Z = 4,a = 750.1(4), b = 1133.7(3), c= 1614.8(3) pm). 
  Reference    Z. Naturforsch. 45b, 1637—7 (1990); eingegangen am 4. April 1990 
  Published    1990 
  Keywords    (Chlorothio)sulfonium Salts, Preparation, Crystal Structure 
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 Identifier    ZNB-1990-45b-1637 
 Volume    45 
11Author    Hans-W Alter, Swidersky, K. Urt DehnickeRequires cookie*
 Title      
 Abstract    [OsC14(C H 3C N)2] • 1/2C H 3CN has been pre­ pared by the reaction o f OsCl5 with acetonitrile in a slow reaction at room temperature, forming red, moisture sensitive crystals. The com pound was characterized by IR spectroscopy as well as by an X-ray structure determination. Space group Pnma, Z = 4, 1281 observed unique reflexions, R = 0.031. Lattice dimensions at 20 °C: a = 1032.5(5), b = 1356.0(7), c = 975.9(5) pm. The complex has a molecular structure, in which the osmium atom is octahedrally coordinated by four chlorine atoms and by two N -atom s o f the cis-coordinated acetonitrile molecules. The included C H 3C N m olecules are disordered in two posi­ tions. 
  Reference    Z. Naturforsch. 45b, 1210—1212 (1990); eingegangen am 26. Februar 1990 
  Published    1990 
  Keywords    Acetonitrile Solvate o f Osmium Tetrachloride, Synthesis, IR Spectra, Crystal Structure 
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 Identifier    ZNB-1990-45b-1210_n 
 Volume    45 
12Author    W. Preetz, P. Hollmann, G. Thiele, H. HillebrechtRequires cookie*
 Title    Darstellung, Reaktionen und spektroskopische Charakterisierung von |O s2X8|2", X = Cl, Br, I, und Kristallstruktur von (P P N )2|O s2I8| * 2 CH2C12 Preparation, Reactions and Spectroscopic Characterization of [Os2X 8]2-, X = Cl, Br, I, and Crystal Structure o f (PPN )2[Os2I8] ■ 2 C H 2C12  
 Abstract    The triply bonded octahalogenodiosm ate(III) anions [Os2X 8]2-, previously known with X = Cl, Br, have now been extended to include the iodide with two staggered OsI4 units. This com ­ pound was prepared by treating [Os2Cl8]2' with N al at room temperature in acetone solu­ tion. The structure determination by X-ray diffractometry on single crystals o f (P P N)2[Os2I8] • 2 C H 2C12, reveals crystallization in the m onoclinic system, space group P 2 ,/c with Z = 4. The O s~O s triple bond is with 2.212(1) Ä the longest within the three octahalogenodiosm ates(III). The Raman spectra show v(OsOs) at 285, [Os2Cl8]2-; at 287, [Os2Br8]2_ and for the iodo compound at 270.1 cm ' 1 with up to three overtones. The spectro­ scopic constants are calculated to be a», = 270.9 cm -1; X u = -0 .5 0 cm "1. The 10 K UV-VIS spectra o f solid [(/7-C4H9)4N ]2[Os2X 8] exhibit ö~n* transitions with maxima at 723, 690 and 643 nm, superimposed by vibrational fine structures with long progressions o f 195, 211 and 183 cm -1 for X = Cl, Br, I, respectively. Oxidation o f [Os2X 8]2~, X = Cl, Br with the corresponding halogen leads to the cleavage o f the O s -O s bond, and the dekahalogenodiosm ates(IV), [Os2X l0]2-, are formed. 
  Reference    Z. Naturforsch. 45b, 1416—1424 (1990); eingegangen am 12. März 1990 
  Published    1990 
  Keywords    O ctaiododiosm ate(III), Synthesis, Crystal Structure, Raman, UV-VIS Spectra 
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 Identifier    ZNB-1990-45b-1416 
 Volume    45 
13Author    Rolf Minkwitz, Volker Gerhard, Hans PreutRequires cookie*
 Title    Halogen-Pseudohalogen-Austausch an Bromsulfoniumsalzen. Dimethylthiocyansulfonium-und Dimethylselenocyansulfonium- Hexafluoroarsenat [1] Halide-Pseudohalide Exchange with Bromosulfonium Salts. Dimethylthiocyanosulfonium-and Dim ethylselenocyanosulfonium-Hexafluoroarsenate [1]  
 Abstract    The preparation and spectroscopic characterization o f the sulfonium salts (C H 3)-,SSCN+A sF 6~, (C H 3)2SSeCN + A sF 6~ and (C H 3),S N C O +A sF ^ is reported. The com ­ pounds are obtained via halide-pseudohalide exchange reactions with (C H 3)2SBr+A sF 6~ and the corresponding silver pseudohalide. In addition the crystal structure o f (C H 3)2SS C N +A sF 6~ was determined. The salt crystallizes in the orthorhombic space group Pbca with a = 1048.4(9) pm, b -1290.2(6) pm, c = 1405.1(12) pm and Z = 8. 
  Reference    Z. Naturforsch. 45b, 1625—1631 (1990); eingegangen am 19. März 1990 
  Published    1990 
  Keywords    Raman Spectra, N M R Spectra, Crystal Structure, Bromosulfonium Salts, Hexafluoroarsenate 
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 Identifier    ZNB-1990-45b-1625 
 Volume    45 
14Author    R. Castro, M.L D Urán, J.A G Arcía-Vázquez, J. Romero, A. Sousa, A. Castiñeiras, W. Hiller, J. SträhleRequires cookie*
 Title    Electrochemical Syntheses of Pyrimidine-2-thiolato Complexes of Nickel(II) Crystal and Molecular Structure of 2,2 -Bipyridine-bis(pyrimidine-2-thiolato)nickel(II) Monohydrate+  
 Abstract    The electrochemical oxidation o f nickel in pyrimidine-2-thione (pym tH) solution yields a com pound o f formula [Ni(pymt)-,]. When pyridine (py), 2,2'-bipyridine (bipy) or 1,10-phenan­ throline (phen) are added to the solution phase, the product obtained is a complex [Ni(pym t)2py2] or [Ni(pym t)2L] (L = bipy or phen). The crystal structure o f [Ni(pym t)2bipy] • H 20 is monoclinic, space group P 2,/c, with a = 726.6(2), b = 1586.2(2), c = 
  Reference    Z. Naturforsch. 45b, 1632—2 (1990); received May 14 1990 
  Published    1990 
  Keywords    Crystal Structure, Nickel(II) Complexes, Pyrimidine-2-thione, Electrochemical Syntheses 
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 Identifier    ZNB-1990-45b-1632 
 Volume    45 
15Author    Á. Vez, C. Rés, M. Isternas, O. Argarita, E. Tero, R. Nrique, U. Lr Ic, LlerRequires cookie*
 Title    Syntheses and Electrochemical Properties of |C5M e5Ru]+ Complexes with Polycyclic Arenes. Crystal Structure of |(C5M e5)Ru( //'-chrysene)] PF6 * 0.5 M e2CO  
 Abstract    M ononuclear and binuclear com pounds [(C5M e5)Ru(//6-arene)PF6 and [(C5M e5R u)2(//6,/76-arene)](PF6)-, were prepared by reacting (C5M e5)RuCl2, the arene and silver acetate with subsequent addition o f N H 4PF6, for arene = phenanthrene, chrysene, tripheny-lene, fluorene, bifluorene. biphenyl and 4,4'-biphenyl. The mononuclear com pounds were also prepared for arene = naphthalene, anthracene, pyrene and coronene. The 'H and l3C N M R spectra are reported. By cyclic voltammetry all compounds show a first reduction potential that is considerably more positive compared with the free arene. The first cathodic wave is irreversible for a wide range o f scanning speeds. However, the mononuclear coronene and the binuclear phenanthrene com pounds show reversibility. The crystal structure o f [(CsM es)Ru(/76-chrysene)]PF6-0.5 Me^CO was determined by X-ray diffraction (3797 unique observed reflexions, R = 0.098). Crystal data: a = 1689.2(2), b = 1524.0(8), c = 2263.5(3) pm, ß = 107.22(1) , space group P 2,/«, Z = 8. Crystallographically independent, two cations [(C5M e5)Ru(>76-chrysene)]+ and two anions PF6~ are present, but their structures are essentially equal. The [C5M esRu]+ unit is bonded to one o f the terminal benzene rings o f the chrysene in a sandwich manner; the rings bonded to Ru are nearly coplanar. The PF6~ ions and the C5M e5 rings exhibit strong thermal vibrations. 
  Reference    Z. Naturforsch. 45b, 658 (1990); received November 18 1989 
  Published    1990 
  Keywords    Pentamethylcyclopentadienyl-arene-ruthenium Hexafluorophosphates Synthesis, N M R Spectra, Reduction Potentials, Crystal Structure 
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 Identifier    ZNB-1990-45b-0658 
 Volume    45 
16Author    Jürgen Pebler, K. Urt Dehnicke, Dieter FenskeRequires cookie*
 Title    Acetylenkomplexe von Rhenium(+VI). Die Kristallstrukturen von |ReCl4(/i-C3H 7—C = C -/i-C3H 7)(POC13)] und ReCl4(THF)2  
 Abstract    Alkyne Complexes o f Rhenium(+ VI). The Crystal Structures of [ReCl4(«-C3H 7-C = C -h-C 3H 7)(POC13)] and ReCl4(T H F)2 Hans-W alter Swidersky, The results o f the magnetic susceptibility measurements o f the previously reported rhenium alkyne complexes [ReCl4(P h C = C P h)]2 • 2 C H 2C12 and [ReCl4(P hC =C P h)(C H 3CN)] in the tem­ 
  Reference    Z. Naturforsch. 45b, 1227—1234 (1990); eingegangen am 20. Februar 1990 
  Published    1990 
  Keywords    Alkyne Complexes o f Rhenium( + VI), IR Spectra, M agnetic Susceptibility, Crystal Structure 
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 Identifier    ZNB-1990-45b-1227 
 Volume    45 
17Author    Wolfgang Hönle, Leonhard Walz, Hans Georg, Von SchneringRequires cookie*
 Title    Bildung und Kristallstruktur von Ethylendiammonium-hydridotrioxophosphat(2 -) [^ N C F ^ C t^ N F y iP H C ^ p Form ation and Crystal Structure of Ethylenediammonium H ydridotrioxophosphate(2-) [HjNCFUCHoNI-ytPHO,]  
 Abstract    Ethylenediammonium H yd ridotrioxophosphate(2-) [HjNCH-jCH-jNHjJITHO:,] is formed by slow oxidation o f white phosphorus by oxygen in ethylendiamine. It crystallizes in the space group Pbca with a = 1570.6(4) pm, b = 676.9(5) pm, c = 1267.8(4) pm and Z = 8 formula units in the unit cell. The structure is built from ethylenediammonium dications and tetra­ hedral phosphonate dianions, linked by O -H -N bonds (d(O--N) = 275.8 pm). The bond distances are d (P -O) = 151.8 pm, d (P -H) = 136.9 pm, d (N -C) = 148.3 pm and d (C -C) = 151.0 pm. 
  Reference    Z. Naturforsch. 45b, 1251—1254 (1990); eingegangen am 13. Februar 1990 
  Published    1990 
  Keywords    Ethylenediammonium H ydridotrioxophosphate(2-), Crystal Structure, Formation, Phosphonate Dianion, Ethylenediammonium Dication 
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 Identifier    ZNB-1990-45b-1251 
 Volume    45 
18Author    Roswitha Schmidt, Brigitte Eisenmann, Rüdiger Kniep, Jürgen Ensling, Philip Gütlich, Reinhard SeidelRequires cookie*
 Title    Zn2(Z n,_;tFe,)Fel" (P 0 4)3 * 2 H 20 : Darstellung, Kristallstruktur und Mößbauer-Untersuchung Zn2(Z n]_ vF ex .)FeIII(P 0 4)3 -2H 20 : Preparation, Crystal Structure and M össbauer Investigation  
 Abstract    Single crystals o f the mixed valency phase Zn2(Z n ,_vF eY)F ein(P0 4)3-2 H20 were grown by hydrothermal treatment o f phosphophyllite (Zn2F e (P 0 4)2-4 H 20) at 160 C in 1 M H3P 0 4. The crystal structure (tricl., P i; a = 641.5(4) pm, b = 914.4(4) pm, c = 983.4(4) pm, a = 70.79(5)°, ß = 78.32(5)°, y = 73.69(5)°; Z = 2) contains P 0 4 tetrahedra, connected via vertices shared with coordination polyhedra o f the metal ions. Cation coordination polyhedra (Fem(Op)5Ow octahedra, (Z n|_vFeY)(O p)5Ow octahedra and Zn(Op)5 trigonal bipyramids) are connected to centrosymmetrical six-membered chains by sharing com m on O -edges. These short chains are interconnected by com m on vertices o f Zn(Op)4 tetrahedra to form infinitive ribbons o f cation coordination polyhedra. The x-values observed for the substitutional posi­ tion (Zn,_A .Fev) varied from .x: = 0.5 (single crystal determ ination) to "y = 1 (Mössbauer investi­ gation). The M össbauer parameters are consistent with high-spin iron in a slightly distorted octahedral environment and valence states (II) and (III). 
  Reference    Z. Naturforsch. 45b, 1255—1261 (1990); eingegangen am 19. April 1990 
  Published    1990 
  Keywords    Orthophosphate Zn/Fe, Mixed Valency C om pound, Hydrothermal Growth, Crystal Structure, Mössbauer Parameters 
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 Identifier    ZNB-1990-45b-1255 
 Volume    45