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1983[X]
21Author    Sigurd Elz, Armin Buschauer, Martin Dräger, Walter SchunackRequires cookie*
 Title    Darstellung, Eigenschaften und Kristallstruktur der N-[2-(4.5.6.7-Tetrahydro-2-benzimidazolyl)-ethyl] -phthalamidsäure Preparation, Properties and Crystal Structure of N-[2-(4.5.6.7-Tetrahydro-2-benzimidazolyl)-ethyl]-phthalamic Acid  
 Abstract    During syntheses using the phthalimide rest in liquid, ethanolic or aqueous ammonia, phthalamides, phthalimides or phthalamic acids are formed depending on reaction condi-tions and work-up. As demonstrated by the synthesis of the title compound via hydrolysis of 4 with aqueous ammonia, dipolar ions of phthalamic acids are obtained if the phthal-imide-N substituent is sufficiently basic. The crystal structure of 5 • 4H2O has been determined and refined until R = 0.0878. It shows a vast system of hydrogen bonds. 
  Reference    Z. Naturforsch. 38b, 1203—1207 (1983); eingegangen am 3. Juni 1983 
  Published    1983 
  Keywords    Crystal Structure, Phthalamic Acid, Phthalamide, Phthalimide 
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 Identifier    ZNB-1983-38b-1203 
 Volume    38 
22Author    Bernhard Lippert, Helmut Schöllhorn, Ulf ThewaltRequires cookie*
 Title    Platin in seiner ungewöhnlichen Oxidationsstufe —III: Diplatin(III)-Komplexe der Modellnukleobase 1-Methyluracil Platinum in its Unusual Oxidation State -fill: Diplatinum(III) Complexes with the Model Nucleobase 1-Methyluracil  
 Abstract    Oxidation of the head-tail dimer cis-[(NH3)2Pt(l-MeU)]2(N03)2 (1-MeU = 1-methyl-uracilato anion, C5H5N2O2) with a mixture of nitrous and nitric acid yields three crystalline 
  Reference    Z. Naturforsch. 38b, 1441—1445 (1983); eingegangen am 15. Juli 1983 
  Published    1983 
  Keywords    Diplatinum(III), Crystal Structure, 1-Methyluracil Complex 
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 Identifier    ZNB-1983-38b-1441 
 Volume    38 
23Author    Hubert Schmidbaur, Beatrix Milewski-Mahrla, FritzE. WagnerRequires cookie*
 Title    Synthese, Struktur und Sb-Mößbauer-Spektren kovalenter und ionischer Tetraorganoantimon(V) -Verbindungen Synthesis, Structure and Sb-Mößbauer Spectra of Covalent and Ionic Tetraorganoantimony(V) Compounds  
 Abstract    Tetramethylstibonium and tetraphenylstibonium oxinate*(l, 2) and anthranilate (4, 5) have been prepared from the antimony pentaorganyls and 8-oxy-quinoline or anthranilic acid, respectively. The crystal structure determination of 1 revealed covalent molecules with planar bidentate oxinate as part of a distorted coordination octahedron at antimony. -121 Sb-Mößbauer spectra of 1, 2, 4, 5 and of tetramethylstibonium acetylacetonate (3) are also in agreement with covalent structures, but a pentacoordinate environment of Sb is more likely for the anthranilates 4, 5. The spectra of the hydrogendicarboxylates 6-9, however, point to ionic stuctures with, if any, only weak donor interactions of the anions with the stibonium cations. 
  Reference    Z. Naturforsch. 38b, 1477—1483 (1983); eingegangen am 14. Juli 1983 
  Published    1983 
  Keywords    Organoantimony Compounds, Mößbauer Spectra, Crystal Structure 
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 Identifier    ZNB-1983-38b-1477 
 Volume    38 
24Author    Siegfried PohlRequires cookie*
 Title    Synthesis and Crystal Structure of a Polymeric Adduct of 2,2'-Dipyridil and Iodine: CioHgN^  
 Abstract    The reaction of 2,2'-dipyridil with iodine (I2; molar ratio 1:3) in CH2C12 solution yields the polymeric complex 2,2'-dipyridil(I2)3. The crystal structure of the compound was determined from single crystal X-ray data (monoclinic, C2/c, a — 3215.0(16), b = 439.9(1), c = 1824.1(9) pm, ß = 130.79(3)°, Z = 4). 2,2'-Dipyridil(I2)3 forms infinite chains of alternating Iß units and bifunctional dipyri-dil molecules. 
  Reference    Z. Naturforsch. 38b, 1535—1538 (1983); eingegangen am 12. Juli 1983 
  Published    1983 
  Keywords    2, 2'-Dipyridil(I2)3, Preparation, Crystal Structure 
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 Identifier    ZNB-1983-38b-1535 
 Volume    38 
25Author    Uwe Klingebiel, Norbert Vater, William Clegg, Martin Haase, GeorgeM. SheldrickRequires cookie*
 Title    Synthesis of Silicon-Phosphorus-Rings - Structure of a cis-2,2,4,4-Tetrakis(silylamino)-l,3-diphospha-2,4-disilacyclobutane  
 Abstract    Fluorosilylphosphanes of the type R2SiFPHR' (R = CHMe2, CMe3, NMeSiMe3; R' = H, C6H5; 1-4) are obtained in the reaction of difluorosilanes with lithiated phosphanes in a molar ratio 1:1. Diphosphasilanes (5, 6) and a difluorosilylphosphane (7) are isolated as by-products. 1-4 react with w-QjHgLi to give cyclic silylphosphanes, LiF, and C4H10 (8-11). Dilithiated 5 reacts with F2PN(CMe3)SiMe3 to form of a four-membered SiP3-ring 12. The 31 P NMR spectra of 9 and 11 show signal coalescence for the eis-and tfrans-isomers at room temperature. The crystal structure of the cis-isomer of 11 has been determined. The substituted ring 13 is prepared in the reaction of lithiated 9 and Me2SiF2. 
  Reference    Z. Naturforsch. 38b, 1557—1562 (1983); eingegangen am 6. Juli 1983 
  Published    1983 
  Keywords    Fluorosilylphosphanes, Cyclisation, P-Inversion, Isomers, Crystal Structure 
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 Identifier    ZNB-1983-38b-1557 
 Volume    38 
26Author    Ralf Steudel, Jürgen Steidel, Richard ReinhardtRequires cookie*
 Title    X-Ray Structural Analyses of Cyclodecasulfur (S10) and of a Cyclohexasulfur-Cyclodecasulfur Molecular Addition Compound (S6 * S10) [1]  
 Abstract    Low temperature X-ray structural analyses of monoclinic single crystals of Sio and Sö • Sio (prepared from the components) show that the cyclic Sio molecule exhibits the same D2 conformation in both compounds with bond distances between 203.3 and 208.0pm, bond angles (a) between 103 and 111°, and torsional angles (r) between 73 and 124°. The Sß molecule (site symmetry Ci) in Sö • Sio is very similar to the one in pure Sö (dss = 206.2 pm, a= 103°, r = 74°). All intermolecular interactions are of van-der-Waals type. The Raman spectrum of S6 • Sio can be explained by a superposition of the Se and Sio spectra. 
  Reference    Z. Naturforsch. 38b, 1548—1556 (1983); received August 11 1983 
  Published    1983 
  Keywords    Elemental Sulfur, Sulfur Rings, Molecular Structure, Crystal Structure, Vibrational Spectra 
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 Identifier    ZNB-1983-38b-1548 
 Volume    38 
27Author    PeterG. Jones, GeorgeM. Sheldrick, Einhard Schwarzmann, Andreas VielmäderRequires cookie*
 Title    Darstellung und Kristallstruktur von Di-gold(III)bis(selenit)oxid, Au2(Se03)20 Preparation and Crystal Structure of Di-gold(III) Bis(selenite) Oxide, Au2(Se03)20  
 Abstract    Au2(Se0s)20 was prepared from gold and excess selenic acid in a sealed tube at 533 K. The crystal structure [P6a2, a = 659.2(2), b = 1183.7(3), c = 399.8(1) pm, Z = 2,R = 0.087] was determined; gold atoms are bridged by oxide ions (lying on twofold axes) and selenite ions. The extended structure consists of polymeric layers parallel to the ««/-plane. The light atom positions are inaccurate because of the presence of a heavy atom in a polar space group. 
  Reference    (Z. Naturforsch. 38b, 10—11 [1983]; eingegangen am 20. September 1982) 
  Published    1983 
  Keywords    Crystal Structure, Sealed-tube Synthesis, Gold(III), Selenite, Oxide 
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 Identifier    ZNB-1983-38b-0010 
 Volume    38 
28Author    Bernt Krebs, Marita Hucke, Michael Hein, Andreas SchäfferRequires cookie*
 Title    Monomere und dimere Oxotrihalogenoselenate(IV): Darstellung, Struktur und Eigenschaften von [As(C6H5)4]SeOCl3 und [N(C2H5)4]SeOCl3 Monomerie and Dimeric Oxotrihalogenoselenates(IV): Preparation, Structure and Properties of [As(C6H5)4]SeOCl3 and [N(C2H5)4] SeOCl3  
 Abstract    The monomeric SeOCl3~ ion, which can be prepared as the tetraphenylarsonium salt from SeOCl2 and As(C6Hs)4C1, was structurally characterized by a low-temperature single crystal X-ray diffraction analysis. [As(C6Hs)4]SeOCl3 is monoclinic, space group P2i/c, with a = 9,332(3), b = 13,761(4), c = 18,985(6) A, ß = 110,97(3)° (at —135 °C), Z = 4; it contains a novel type of y>-trigonal bipyramidal oxotrichloroselenate(IV) anion which is not associated to dimers or polymer chains as in known structures. The equatorial positions are occupied by doubly bonded oxygen (Se-O 1,601(3) Ä) and by one Cl (Se-Cl 2,234(1) A), the axial Se-Cl bonds (2,430(1) and 2,475(1) A) being significantly longer. [N(C2H5)4]SeOCl3, which was obtained as crystals by oxidation of trichloroselenate(II), is triclinic, space group P I, with a = 10,607(3), b = 8,950(2), c = 8,862(2) A, a = 119,79(2)°, ß = 101,07(2)°, y = 96,28(2)°, Z = 2. The X-ray structure analysis shows the anions to be present as centrosymmetric dimers Se202Cl6 2 " like in the [P(CeH5)4] + salt, with two tetragonal SeOCU pyramids linked through a C1---C1 edge and the lone pairs trans to the axial Se-0 bonds (1,589(4) A). Se-Cl bond lengths are 2.270(1) and 2,351(2) A (terminal); 2,698(1) and 2,920(1) A (bridging). The results show that the nature of the reaction products of the Lewis acid SeOCl2 with halogenides as bases changes very sensitively with small variations in cations and environment. The vibrational spectra are discussed. 
  Reference    (Z. Naturforsch. 38b, 20—29 [1983]; eingegangen am 23. September 1982) 
  Published    1983 
  Keywords    Oxohalogenoselenates, Crystal Structure, Selenium, Inert Electron Pair, Selenium Oxychloride 
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 Identifier    ZNB-1983-38b-0020 
 Volume    38 
29Author    William Clegg, Uwe Klingebiel, GeorgeM. SheldrickRequires cookie*
 Title    Attack by a Lithiated Aminofluorosilane on the C-0 Bond of Cr(CO)6; Formation of Isonitrile Complexes  
 Abstract    The photochemical reaction of a lithiated aminofluorosilane with Cr(CO)6 leads to sub-stitution of one or two carbonyl oxygen atoms and formation of isonitrile complexes. The crystal structure of the disubstituted product, cis-di(<er£-butyhsonitrile)tetracarbonylchromium, has been determined. 
  Reference    Z. Naturforsch. 38b, 260—261 (1983); eingegangen am 6. Oktober 1982 
  Published    1983 
  Keywords    Lithium -aminofluorosilane, Chromium Carbonyl, Photochemical Reaction, Crystal Structure, Isonitrile Complex 
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 Identifier    ZNB-1983-38b-0260_n 
 Volume    38 
30Author    Hans-Ulrich Höfs, Rüdiger Mews, Mathias Noltemeyer, GeorgeM. Sheldrick, Martin Schmidt, Gerald Henkel, Bernt KrebsRequires cookie*
 Title    Reactions of Fluorinated Nitriles with Sulphur(II) Chlorides; Crystal Structure of 2,4,6-Tris(difluorosulphoximido)-l,3,5-triazene at 170 K  
 Abstract    The addition of CF3SC1 (2) to the fluorinated nitriles RfCN[Rf = CF3 (3), NSF2 (4), NSOF2 (5)] leads to N-perfluoromethanesulphenyl-formylimidoylchlorides CF3S-N = C(C1)/?/ (6, 11, 12). From the reactions of SC12 (1) with (3) and (5), which yielded the N-sulphenyl-chlorides C1S-N = C(C1)-R/ (7, 13), it proved possible also to isolate the oxidation product [CF3CC12NSC12 (8)] and an oligomer of the nitrile [(NCNSOF2)3 (14)]. Dechlorination of 7 with Hg gives the corresponding di-and tri-sulphides (CF3C(Cl) = N-)2Sa; (9, 10, x — 2, 3). Crystals of (14) are triclinic with a = 1133.6(5), b = 1332.6(5), c = 1715.1(8) pm, a = 109.31(3), ß = 105.30(3), y = 97.84(3)° at 170 K, Z = 8, space group P I. The structure was refined to R = 0.028 for 8290 diffractometer data with F > 4cr(F). The four crystallo-graphically independent molecules adopt similar unsymmetrical conformations. N-Sulphenylacetimidoyl halides of the type RC(X)=N-S-Y are important in preparative chem-istry for several reasons: (a) When Y is a halogen, it may be readily exchanged, leading to a chemistry analogous to that of the perhaloalkylsulfenylhalides RhaiSCl [1, 2]. Examples of such substitution reac-tions have already been reported [2, 3], (b) When the substituent X on the triply-coordinated carbon is a halogen, the -M effect of the imino-nitrogen facilitates nucleophilic attack. Hard nucleophiles (fluoride, alcohols, amines) tend to replace X [4], soft nucleophiles the sulphur-substituent Y. (c) The >C=N-S-system may be regarded as a shortened diene, in which the second double bond is replaced by the oxidisable sulphur atom; instead of the usual 1,4-addition this results in 1,3-addition with simul-taneous oxidation of the sulphur [5]. One of the simplest examples of this class of com-pounds , chlorosulphenylchloroformylimidoylchloride may be prepared in several ways; the synthesis [6] from C1CN and SC12 opens a general route to the N-sulphenylimidoyl derivatives [4, 7-9]: C1CN + SC12 C1S-N=CC12 1 RCN + R'SCl -> R'S-N=CC1R 2 * Reprint requests to Prof. R. Mews. 0340-5087/83/0400-0454/$ 01.00/0 We report here an investigation of the corresponding addition of CF3SCI and SC12 to the fluorinated nitriles N = C-CF3, N = C-NSF2 and N = C-NSOF2. Experimental 
  Reference    Z. Naturforsch. 38b, 454—459 (1983); eingegangen am 8. November 1982 
  Published    1983 
  Keywords    Crystal Structure, Perfluoromethanesulphenylformylimidoylchlorides, N-Sulphenylchlorides, 1, 3, 5 -Triazenes 
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 Identifier    ZNB-1983-38b-0454 
 Volume    38 
31Author    Gerhard Jäger, PeterG. Jones, GeorgeM. Sheldrick, Einhard SchwarzmannRequires cookie*
 Title    Darstellung und Kristallstruktur von Antimon(V)oxidhydroxid HSb308 Preparation and Crystal Structure of the Antimony(V) Oxide Hydroxide HSb30g  
 Abstract    Colourless crystals of HSb3Os were prepared by hydrothermal methods from Sb205. The crystal structure [P2/n, a = 945.6(2), b = 869.1(2), c = 990.9(2) pm, ß = 90.25(2)°, Z = 6. R = 0.045] was determined from diffractometer measurements. Distorted SbOe octahedra are linked through vertices and edges to form a three-dimensional polymer of pseudo-orthorhombic symmetry. The hydrogen atoms could not be located. 
  Reference    Z. Naturforsch. 38b, 698—701 (1983); eingegangen am 14. Februar 1983 
  Published    1983 
  Keywords    Crystal Structure, Antimony(V), Oxide, Hydroxide, Hydrothermal Synthesis 
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 Identifier    ZNB-1983-38b-0698 
 Volume    38 
32Author    Hans-Friedrich Klein, Klaus Ellrich, Dietmar Neugebauer, Olli Orama, Karl KrügerRequires cookie*
 Title    Triphenylstanny]tris(trimethylphosphan)cobalt - Molekül struktur und Eigenschaften Triphenylstannyltris(trimethylphosphane)cobalt -Molecular Structure and Properties  
 Abstract    Potassium cobaltates K+CoLsL' -(L = MeaP, L' = N2, olefin) react with SnCl(CeHs^ or GeBr(CeH5)3 to give tetracoordinate complexes containing Co-Sn and Co-Ge bonds. Crystal and molecular structures of two single crystals were determined. They show tetrahedral molecules Co[Sn(C6Hs)3][P(CH3)3]3 in different packing order. Both tetra-coordinate compounds take up small ligands thereby completing their 18-electron valence shells in compounds Co[E(C6H5)3]L3L' (L = (CH3)3P; E = Ge, L' = CO; E = Sn, L' = CO, C2H4). A sparingly soluble paramagnetic adduct Co[Sn(C6Hs)3]L4 is believed to contain a tin-bonded phosphane. Allgemeines 
  Reference    Z. Naturforsch. 38b, 303—310 (1983); eingegangen am 29. November 1982 
  Published    1983 
  Keywords    Triphenylstannyl and Triphenylgermyl Cobalt(I) Complexes, Synthesis, Reactions, Crystal Structures, Molecular Structure 
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 Identifier    ZNB-1983-38b-0303 
 Volume    38 
33Author    DietrichK. Breitinger, Günter Petrikowski, Günter Liehr, Raymond SendelbeckRequires cookie*
 Title    Metallomethane, VI [1] Kristallstruktur von Tetrakis(chloroquecksilber)methan-Dimethylsulfoxid C(HgCl)4 (CH3)2SO Metallomethanes, VI [1] Crystal Structure of Tetrakis(chloromercuri)methane-Dimethylsulfoxide C(HgCl)4 * (CH3)2SO  
  Reference    Z. Naturforsch. 38b, 357—364 (1983); eingegangen am 9. November 1982 
  Published    1983 
  Keywords    Metallomethanes, Tetrakis(halomercuri )methanes, Tetrakis(chloromercuri) methane -Dimethylsulfoxide, Crystal Structure, Molecular Packing 
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 Identifier    ZNB-1983-38b-0357 
 Volume    38 
34Author    On Hexaiodoplatinates, M. =. M2pti6, Rb, Gerhard Thiele, Christian Mrozek, Dieter Kammerer, Kurt WittmannRequires cookie*
 Title    Über Hexaiodoplatinate(IV) M2PtI6 (M = K, Rb, Cs, NH4, TI) - Darstellungsverfahren, Eigenschaften und Kristallstrukturen  
 Abstract    Crystals of hexaiodoplatinates(IV) M2PtI6 (M = K, Rb, Cs, NH4, TI) have been obtained by heating Ptl4 or H2PtCl6 in highly concentrated aqueous solutions of MI in the presence of small amounts of HI and I2 in an ampoule for 24 h at 160 °C. The structural parameters were determined from single crystal data. In water less soluble compounds with M = Rb, Cs, NH4 show the cubic K2PtCl6 structure, whereas the easily water soluble salts with M = K, TI both crystallize in a tetragonally distorted version of this structure type. 
  Reference    Z. Naturforsch. 38b, 905—910 (1983); eingegangen am 20. April 1983 
  Published    1983 
  Keywords    Cs, NH4, TI) -Preparation, Properties and Structural Data Iodoplatinates, Crystal Structure, Hexaiodoplatinates(IV) 
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 Identifier    ZNB-1983-38b-0905 
 Volume    38 
35Author    M. Veith, 0. RecktenRequires cookie*
 Title    Cyclische Diazastannylene, XVIII [1] Zur Frage der Bindungsbeschreibung in Polyedern des Typs Sn4X3Y: Die Kristall-und Molekülstrukturen von Sn4(N Bu)4 und Sn4(N'Bu)30 Cyclic Diazastannylenes, XVIII [1] Bonding Description in Polyhedra of the Sn4X3Y-Type: The Crystal and Molecular Structures of Sn4(N'Bu)4 and Sn4(N<Bu)30  
 Abstract    Crystals of Sn4(N J Bu)4 (1) are monoclinic, space group P2i/c, with cell constants a = 1038.9(4), b = 1468.3(5), c = 1698.8(5) pm, ß = 91.6(1)° and Z = 4, while those of Sn4(N i Bu)30 (2) are triclinic, space group P I, with dimensions a = 1293.0(5), b = 1027.1(5), c = 1716.7(9) pm, a = 90.9(1), ß = 102.5(1), y = 107.0(1)° and Z = 4. The molecules 1 are held together by van-der-Waals forces, whereas two molecules 2 interact in the crystal by weak 0->-Sn donor bonds (290-332 pm) forming dimers. The outstanding structural elements of 1 and 2 are the Sn4N4 and Sn4N30 polyhedra, which can be described by two interpenetrating tetrahedra of tin atoms and of nitrogen or nitrogen and oxygen atoms forming a distorted cube, which approaches "43 m symmetry in the case of 1 and 3m for 2. Characteristic distances are in 1: Sn-N 220.2 pm, in 2: Sn-N 221.3 pm and Sn-0 213.2 pm. An almost ionic bonding model and two covalent models are discussed on the basis of the structural data including Sn4(N i Bu)3OAlMe3. 
  Reference    Z. Naturforsch. 38b, 1054—1061 (1983); eingegangen am 9. Juni 1983 
  Published    1983 
  Keywords    gewidmet Crystal Structure, Molecular Structure, Cubane-Like Polycycles, Bonding Description, X-Ray 
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 Identifier    ZNB-1983-38b-1054 
 Volume    38 
36Author    New Monocyclic Acyloxyfluoroboranes, Herbert Binder, Walter Matheis, Hans-Jörg Deiseroth, Han Fu-Son, ProfH. Dr, W. Binder, MatheisRequires cookie*
 Title    Über neue monocyclische Acyloxyfluoroborane 2.2.6.6-Tetrafluoro-1.4-dialkyl-1.3.5-trioxa-1.6-diboracyclohexene: Darstellung, Molekül-und Kristallstruktur  
 Abstract    Acyloxyfluoroboranes Trimeric alkoxydifluoroboranes (F2BOR)3 (2) react with organic acid anhydrides by substitution of a ring group OR forming monocyclic acyloxyfluoroboranes of the type 2,2,6,6-tetrafluoro-l,4-dialkyl-l,3,5-trioxa-2,6-diboracyclohexene (3). The X-ray crystal structure determination of 3a shows two conformational isomers: two planar and two non-planar six-membered rings are present in the unit cell. The ring conformation is influenced by weak intermolecular H — F interactions. 
  Reference    Z. Naturforsch. 38b, 554—558 (1983); eingegangen am 15. November 1982/26. Januar 1983 
  Published    1983 
  Keywords    6, 6-Tetrafluoro-l, 4-dialkyl-l, 3, 5-trioxa-2, 6-diboracyclohexenes: Synthesis, Molecular and Crystal Structure 
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 Identifier    ZNB-1983-38b-0554 
 Volume    38 
37Author    Reinhold Tacke, Hartwig Lange, WilliamS. Sheldrick, Günter Lambrecht, Ulrich Moser, Ernst MutschierRequires cookie*
 Title    Sila-Pharmaka, 31. Mitt. [1] Synthese, Struktur und pharmakologische Eigenschaften von Diphenyl(2-piperidinoethoxymethyl)silanol und seinem Kohlenstoff-Analogon Sila-Pharmaca, 31 th Communication [1J Synthesis, Structure, and Pharmacological Properties of Diphenyl(2-piperidinoethoxymethyl)silanol and its Carbon Analogue  
 Abstract    In the course of systematic investigations on sila-substituted parasympatholytics the diphenyl(2-aminoethoxymethyl)silanols 3b and 4b (and its carbon analogue 4a) were synthesized and characterized by their physical and chemical properties. In the solid state 4a and 4b form strong 0-H---N hydrogen bonds, which are intramolecular (4a) and intermolecular (4b), respectively. 4 a and 4 b were found to be weak antimuscarinic agents (4b >4a) and strong papaverine-like spasmolytics (4a ^4b). 
  Reference    Z. Naturforsch. 38b, 738—746 (1983); eingegangen am 5. Januar 1983 
  Published    1983 
  Keywords    Sila-Substitution, Crystal and Molecular Structure, Antimuscarinic and Papaverine-Like Activity 
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 Identifier    ZNB-1983-38b-0738 
 Volume    38 
38Author    Gerhard Klebe, JanW. Bats, Karl HensenRequires cookie*
 Title    Coordinative Interactions in Chelated Complexes of Silicon, Part HI Crystal and Molecular Structure of l-Trichlorosilyl-l,2,3,4-tetrahydro-l,10-phenanthroline  
 Abstract    The crystal structure of Ci2HiiN2SiCl3 (monoclinic, P2i/m, Z = 2, with a: 9.284(4), b: 7.226(2), c: 10.832(5) Ä, ß = 115.14(3)°) was refined to R(F) -0.035 from 1228 inde-pendent reflections. A trigonal bipyramidal, pentacoordinate silicon is observed. The chelated complex shows two different Si-N bonds, a coordinative bond (1.984(2) A) be-tween Si and N on the axial position and a Si-N single bond (1.737(3) A, equatorial plane), introduced by chemical reaction. The coordinative bond is 14.2% longer than the Si-N single bond. The lengthening of the coordinative bond in the present case is compared with distances in other extracoordinated silicon compounds. 
  Reference    Z. Naturforsch. 38b, 825—829 (1983); received March 23 1983 
  Published    1983 
  Keywords    Crystal and Molecular Structure, Chelated Pentacoordinated Silicon, Lewis Acid Base Interactions, Coordinative Bonding 
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 Identifier    ZNB-1983-38b-0825 
 Volume    38 
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