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21Author    ErnstOtto Fischer, Jiabi Chen, Ulrich SchubertRequires cookie*
 Title    Übergangsmetall-Carben-Komplexe, CXXVI [1] Darstellung und Struktur symmetrischer Hydroxycarben-Anhydrid-Komplexe des Mangans und Rheniums Transition Metal Carbene Complexes, CXXVI [1] Preparation and Structure of Symmetrica! Hydroxycarbene Anhydride Complexes of Manganese and Rhenium  
 Abstract    Symmetrical anhydrides of hydroxycarbene complexes of manganese and rhenium, [JT-C5H5(C0)2MC(R)]20, (M = Mn, Re) are prepared by reaction of cationic carbyne com-plexes [.T-C5HÖ(CO)2MCR]BX4 with the corresponding metal carbonyl acylates Li[7r-C5H5(C0)2MC(0)R]. [^-C5H5(CO)2MnC(C6H5)]20 is also obtained by controlled hydrolysis of Tr-CsH^CO^MnCXBrJCeHs. The new complexes are characterized spectro-scopically and by an X-ray structure analysis of [jr-CsH^CO^MnQCeHs^O. Bei der Reaktion von Pentacarbonyldiethyl-aminocarbin-chrom-tetrafluorborat, [(CO)5CrCNEt2]BF4, mit NMe4[(C0)5MC(0)R] (M = Cr, W) entstehen die gemischten Hydroxy-carben-Anhydrid-Komplexe 
  Reference    Z. Naturforsch. 37b, 1284—1288 (1982); eingegangen am 7. Juni 1982 
  Published    1982 
  Keywords    Cationic Carbyne Complexes, Metal Acylates, Bromocarbene Complex, Molecular Structure 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-1284.pdf 
 Identifier    ZNB-1982-37b-1284 
 Volume    37 
22Author    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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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1548.pdf 
 Identifier    ZNB-1983-38b-1548 
 Volume    38 
23Author    Ulf Thewalt, Konrad HollRequires cookie*
 Title    Spaltung von S4N4 zu S2N2 bei Raumtemperatur: Darstellung und Struktur von S2N2 * 2AlBr3 Cleavage of S4N4 to S2N2 at Room Tem perature: Preparation and Structure of S2N2 * 2A lB r3  
 Abstract    The compound S2N2 • 2A lBr3 has been prepared by reaction of S4N4 with AlBr3 in 1,2-di-bromoethane at room temperature. Its crystal and molecular structure have been determined by X-ray diffraction; R = 0.068. Crystal data: monoclinic, P 2Jn, a = 9.594(5), b = 9.975(4), c = 7.528(4) Ä , ß = 111.36(5)°. The S2N2 ring of the centrosymmetrical complex is bonded via its nitrogen atoms to two AlBr3 units thus completing coordination tetrahedra around the A1 atoms. Bond distances and angles within the S2N2 ring are d(S—N) = 1.629(13) and 1.651(13) Ä , < (S —N -S) = 95.8, and < (N —S—N) — 84.2°. Whereas the S—N bond lengths agree closely with those of free S2N2, the angle at N is enlarged by ca. 5° and the angle at S is decreased by ca. 5°. The sulfur atoms form two close S --B r contacts of length 3.149 (intramolecular) and 3.193 (inter-molecular) Ä , respectively. The intermolecular attractive nonbonded S - • -Br interactions tie the complexes together in a way that leads to infinite chains which run parallel to the crystallographic z axis. 
  Reference    Z. Naturforsch. 39b, 145 (1984); eingegangen am 23. August 1983 
  Published    1984 
  Keywords    Molecular Structure, Disulfurdinitride Ligand, Aluminium Tribromide Adduct, T etrasulfurtetranitride 
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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-0145.pdf 
 Identifier    ZNB-1984-39b-0145 
 Volume    39 
24Author    M. Veith, F. Goffing, V. HuchRequires cookie*
 Title    On the Coordination of Different Main Group Metals with a Special, Chelating Silazane  
 Abstract    The c/s-isomer of the silazane H ; L (1) (L = [N'Bu][Me]Si(N r Bu) 2 Si[Me][N r Bu]) has been used as a ligand to main group metals. By displacing the hydrogen atoms of 1 the compounds L(MgMe) 2 (4), L(MgCl) 2 (5) and L(Li)(InMe 2) (6) have been obtained. According to the 'H NMR spectra the structures of 4—6 are very similar: a polycyclic, cubane-like Si 2 N 4 M 2 framework results from the special atomic arrangements and from intramolecular Lewis acid-base interactions between the metals M and the nitrogen atoms. Divalent metals and metal-centered groups can also be incorporated into 1. In the latter case a seco norcubane-like polycycle Si 2 N 4 M is produced as confirmed by X-ray structure determinations of LGaMe (8) and LSb + InCl 4 ~ (11). LInMe (7) and LSn (9) seem to adopt the same tricyclic structure as 8, although the 'H NMR spectra are not consistent with a rigid molecule (low symmetry), but rather with a fluxional behaviour (high symmetry). When 5 is allowed to react with sodium/naphthalene in THF part of the magnesium is reduced and LMg(THF) : (12) is formed. An X-ray structure determination of 12 reveals the compound to be only bicyclic with the magnesium atom coordinated by two nitrogen and two THF oxygen atoms. 
  Reference    Z. Naturforsch. 43b, 846—856 (1988); eingegangen am 8. Februar 1988 
  Published    1988 
  Keywords    Metal Amides, Molecular Structures, 'H NMR Spectra X-Ray, Chelated Metal Atoms 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-0846.pdf 
 Identifier    ZNB-1988-43b-0846 
 Volume    43 
25Author    P.Requires cookie*
 Title    Mehrkernige CpZr(IV)-und CpHf(IV)-Komplexe mit Oximatobrücken  
 Abstract    o ly n u cle ar C p Z r(IV) a n d C p H f(IV) C o m p le x e s w ith O x im a to B rid g e s W olfgang B ra u n w a rth , U lf T hew alt* The mono-cyclopentadienyl metal complexes C pZrC l3(dme) and CpHfCl3(dme) react with acetone oxime in the presence of triethylamine to form the isotypic dinuclear complexes [CpMCl2]2(M-ONCMe2)2(//-HONCM e2) (1: M = Zr; 2: M = Hf). 1 and 2 contain two oximato bridges and one oxime bridge. In the presence of w ater the reaction gives, with partial hydro­ lysis, the cyclic trinuclear compounds [CpZrCl]3(a3-0)(M3-0 H)(« -0 N C M e 2)3«/:Me2C N 0 H 
  Reference    Z. Naturforsch. 52b, 1011—1018 (1997); eingegangen am 4. März 1997 
  Published    1997 
  Keywords    Zirconium Complexes, Hafnium Complexes, Oximato Ligands, Oxime Ligand, Molecular Structure 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-1011.pdf 
 Identifier    ZNB-1997-52b-1011 
 Volume    52 
26Author    ViktorP. Balema, Steffen Blaurock, Evamarie Hey-HawkinsRequires cookie*
 Title    Synthesis and Molecular Structure of a Superbulky Tertiary Phosphine: Bis[2-phenyl-l,2-dicarba-c/oso-dodecaboran-l-yl(12)]phenylphosphine  
 Abstract    Bis[2-phenyl-l,2-dicarba-c/oso-dodecaboran-l-yl(12)]phenylphosphine (2) was obtained in 91% yield from phenyldichlorophosphine and two equivalents of l-lithium-2-phenyl-l ,2-dicarba-c/o5o-dodecaborane(12) in ether and characterized by spectroscopy (3IP, 1 B, 'H, l3C NMR; IR) and by X-ray structure determination. 
  Reference    Z. Naturforsch. 53b, 1273—1276 (1998); received May 20 1998 
  Published    1998 
  Keywords    Synthesis, Molecular Structure, X-Ray Data, NMR Data, Phosphine 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1273.pdf 
 Identifier    ZNB-1998-53b-1273 
 Volume    53 
27Author    T. Radnai, H. OhtakiRequires cookie*
 Title    Intramolecular and Liquid Structures of Tetramethylurea Studied by Means of X-Ray Diffraction  
 Abstract    The intramolecular and liquid structures of tetramethylurea (TMU) were investigated by the liquid x-ray diffraction method. It is confirmed that in the liquid state the four methyl groups are out of the plane which is constructed by the O, C, and the two N atoms, the molecular structure being similar to what had been found in the gas phase. All structural parameters are in good agreement with those of TMU determined in the gas phase and with those of amide derivatives in the liquid phase. The liquid is characterized by a random distribution of molecules as predominant, but a weak molecular ordering characterized by approximately two intermolecular nonbonding Me • • • O dis-tances at 340 pm is proposed. 
  Reference    Z. Naturforsch. 47a, 1003—1010 (1992); received May 20 1992 
  Published    1992 
  Keywords    Tetramethylurea, Liquid x-ray diffraction, Liquid structure, Molecular structure, Non-aqueous solvent 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-1003.pdf 
 Identifier    ZNA-1992-47a-1003 
 Volume    47 
28Author    W. J. Bresser, J. Wells, M. Zhang, P. BoolchandRequires cookie*
 Title    Molecular Origin of Glass Forming Tendency in Ternary Te-Se-Br(Cl) Chalcohalide Glasses  
 Abstract    Bulk glasses of Te 3 _-Se-(CI or Br) 2+V , the composition spanning the glass forming range, were characterized by differential scanning calorimetry, l2r, Te absorption, and 129 I emission Mössbauer spectroscopy. The results reveal that the stoichiometric glasses Te 3 (Cl or Br) 2 consists of c-Te 3 Cl 2 -like chain fragments about 1.5 nm long and terminated by one-fold coordinated halogen atoms. The 12:i Te electric hyperfine structure results reveal that Te replacement by Se (z =/ 0) leads to preferential occupancy at those Te sites in the chains that are two-fold coordinated, and in a rather striking fashion demonstrate that the average length of the chain fragments remains independent of Se concentration. Halogen atoms in the glasses act as chain terminators, and also bond to Te-sites in the chains to produce four-fold coordinated sites. The low glass transition temperatures (7g ~ 70 -90°C), the low average coordination number of the proposed chain-fragments, along with the hyperfine structure results, suggest that the extensive glass forming tendency in the chalcohalides derives from the floppiness of the chain-fragments. 
  Reference    Z. Naturforsch. 51a, 373—380 (1996); received January 5 1996 
  Published    1996 
  Keywords    ^Te Absorption Mössbauer Spectroscopy, 129 I Emission Mössbauer Spectroscopy, Chalcohalide Glasses, Molecular Structure, Glass Formation 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0373.pdf 
 Identifier    ZNA-1996-51a-0373 
 Volume    51 
29Author    Hans-Friedrich Klein, Reinhard Hammer, Josef Wenninger, Peter Friedrich, Gottfried HuttnerRequires cookie*
 Title    Eine neuartige Assoziation zwischen Kalium und komplex gebundenem DistickstofF -Struktur von KN2Co(PMe3)3 A Novel Association of Potassium and Co-ordinated Dinitrogen - Crystal Structure of KN2Co(PMe3)3  
 Abstract    [(Me3P)3CoN2]2Mg(THF)4 reacts with potassium metal to give [KN2Co(PMe3)3]6. The same compound is obtained via substitution of olefin in cobaltates K + [Co(olefin)(PMe3)3] _ by molecular nitrogen under ambient conditions. Infrared data show that association is preserved even in ether solvents. The stability of cobaltates [Co(PMe3)3L]~ increases in the order L — olefin < dinitrogen < PMe3. Reactions of the title compound proceed as oxidative additions to the monomer with loss of molecular nitrogen. Methyl iodide and allyl bromide yield the fluxional complexes CoCH3(PMe3)4 and ^ 3 -C3H5Co(PMe3)3, respectively. Ethyl bromide gives cis-CoH(C2H4)(PMe3)3 via /3-elimination and coordination of ethylene. The molecular structure of [KN2Co(PMe3)3]6 reveals a novel type of cluster: a double cube made up from six KN2 units with six aro-Co(PMe3)3 groups (d(NN) = 116-118 pm, d(CoN) = 170-171 pm). 
  Reference    Z. Naturforsch. 33b, 1267—1273 (1978); eingegangen am 13. Juli 1978 
  Published    1978 
  Keywords    Potassium-Dinitrogen Cobaltate, Synthesis, Association in Solution, Molecular Structure, Crystal Structure 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-1267.pdf 
 Identifier    ZNB-1978-33b-1267 
 Volume    33 
30Author    Eberhard Stumpp, Uwe HillebrandRequires cookie*
 Title    Ligandenfeldspektroskopische Untersuchungen an Übergangsmetall -Aluminium -Tetraalkoxiden Ligand Field Spectroscopic Studies of Transition Metal Aluminium-Tetraalkoxides  
 Abstract    The preparation and the electronic spectral properties of compounds M[A1(0R)4]2 (M = Co, Ni, Cu and R = CH3, C2H5, n-CsIU, n-CjHg) are described. The spectral data are used in conjunction with ligand field theory in deducing the structures of the compounds. The spectrum of green Ni[Al(OR)4]2 is interpreted as a Ni(OR)6 octahedron sharing faces with two Al(OR)4 tetrahedrons. It is proposed that Co 2+ and Cu 2+ are in a distorted octahedral coordination. The alkoxide ligands have been fitted into the spectrochemical and the nephelauxetic series. They are close to H2O in this series. 
  Reference    Z. Naturforsch. 34b, 262—265 (1979); eingegangen am 9. 0ktober/20. November 1978 
  Published    1979 
  Keywords    Transition Metal Aluminium-Tetraalkoxides, Ligand Field Spectra, Molecular Structure, Spectrochemical Series, Nephelauxetic Series 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0262.pdf 
 Identifier    ZNB-1979-34b-0262 
 Volume    34 
31Author    M. Veith, 0. RecktenwaldRequires cookie*
 Title    Cyclische Diazastannylene, X [1] Die Kristall-und Molekülstruktur eines Moleküls mit verzerrt-würfelförmigem Sn4N30-Käfig Cyclic Diazastannylenes, X [1] The Crystal and Molecular Structure of a Molecule with a Distorted Cube-Shaped SiLiNsO-Cage  
 Abstract    The crystal and molecular structure of (me3CN)3(me3A10)Sn4 has been determined from three-dimensional X-ray data (4-circle diffractometer, R — 0.048). The crystals are mono-clinic, space group P2i/c, with cell dimensions a = 1017.4(5), b — 1488.5(7), c = 1748(1) pm, jS—91.5(1)° and Z — 4. The molecules approach 3m point-symmetry and include a SruNsO-cage, the atoms occupying the corners of a distorted cube formed by two, differently sized, interpenetrating concentric tetrahedra of tin and nitrogen/oxygen atoms. The nitrogen atoms are attached to tert-butyl groups, whereas the oxygen atom of the cage acts as a base towards the aluminiumtrimethyl group. Typical bond distances and angles (mean values) are: Sn-N = 219.9, Sn-0 = 220.3 pm; N-Sn-N = 81.2°; N-Sn-0 = 79.0°; Sn-N-Sn = 98.8° and Sn-O-Sn -100.2°. 
  Reference    Z. Naturforsch. 36b, 144—149 (1981); eingegangen am 14. Oktober 1980 
  Published    1981 
  Keywords    Molecular Tin(II) Compounds, Iminostannylenes, Cubane-Like Cage, X-ray, Molecular Structure 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0144.pdf 
 Identifier    ZNB-1981-36b-0144 
 Volume    36 
32Author    Hartmut Köpf, Joachim PickardtRequires cookie*
 Title    Molekül-und Kristallstruktur von 1.1-Dimethylsilylentitanocendichlorid, (CH3)2Si(C5H4)2TiCl2 * Molecular and Crystal Structure of l,r-Dimethylsilylene Titanocene Dichloride, (CH3)2Si(C5H4)2TiCl2  
  Reference    Z. Naturforsch. 36b, 1208—1210 (1981); eingegangen am 4. Mai 1981 
  Published    1981 
  Keywords    [l]-Titanocenophane, l, l'-Dimethylsilylene Titanocene Dichloride, Molecular Structure, X-ray 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1208.pdf 
 Identifier    ZNB-1981-36b-1208 
 Volume    36 
33Author    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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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0303.pdf 
 Identifier    ZNB-1983-38b-0303 
 Volume    38 
34Author    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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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1054.pdf 
 Identifier    ZNB-1983-38b-1054 
 Volume    38 
35Author    Hans-Christian Böttcher3-, Helmut Hartungb, Andre KrugbRequires cookie*
 Title    Synthese und Kristallstruktur des koordinativ ungesättigten Komplexes [FeRu(CO)5(//-P B u92] Synthesis and Crystal Structure of the Coordinatively Unsaturated Complex [FeR u(C O )5Cu-PBu92]  
 Abstract    [{Ru(CO)3C12}2] reacts with the in situ prepared reagent Li2[Fe(CO)3(PBu2)2] to give the new heterobinuclear complex [FeRu(CO)5(w-PBu92] (!) • Crystals of 1 are isomorphous to those of the known compound [Fe2(CO)5(a-PBu2)2] (2) and crystallize in the triclinic space group P 1 with a = 867,5(1), b = 1181,0(2), c = 1373,1(2) pm; a = 76,64(1), ß = 79,72(1) and y = 76,48(1)°. A double bond between the two metal atoms concluded for 2 from the results of EHMO calcula­ tions is also proposed for 1 (Fe=Ru: 259,8(1) pm). 
  Reference    Z. Naturforsch. 50b, 1175—1180 (1995); eingegangen am 19. Januar 1995 
  Published    1995 
  Keywords    Iron-Ruthenium Complex, H eterobinuclear Carbonyl Complex, Iron-Ruthenium Double Bond, Crystal Structure, Molecular Structure 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-1175.pdf 
 Identifier    ZNB-1995-50b-1175 
 Volume    50 
36Author    Manfred Weidenbruch, Klaus Kramer, Karl Peters, Hans Georg Von SchneringRequires cookie*
 Title    Siliciumverbindungen mit starken intramolekularen sterischen Wechselwirkungen, XX [1] l,l-Di-terf-butyl-2,2-dimesityldisilane: Synthese  
  Reference    Z. Naturforsch. 40b, 601—606 (1985) 
  Published    1985 
  Keywords    Molekülstruktur, Radikale Silicon Compounds with Strong Intramolecular Steric Interactions, XX [1] l, l-Di-rm-butyl-2, 2-dimesityldisilanes: Synthesis, Molecular Structure, Radicals, l-Di-rm-butyl-2, 2-dimesityldisilanes, X-Ray, Emperical Force Field Calculations, Disilenyl Radical Anion 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0601.pdf 
 Identifier    ZNB-1985-40b-0601 
 Volume    40 
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