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1983 (307)
141Author    H.-J Kraus, H. Werner, C. KrügerRequires cookie*
 Title    Synthese und Struktur von C5Me5Pd(PR3)X: Palladiumkomplexe mit einem unsymmetrisch gebundenen Pentamethylcyclopentadienylring [ 1 ] Synthesis and Structure of CsMe5Pd(PR3)X: Palladium Complexes with an Unsymmetrically Bonded Pentamethylcyclopentadienyl Ring [1]  
 Abstract    The complexes C5Me5Pd(PR3)X (1-4) are prepared from [Cl(PR3)Pd]2(iM-OCOCH3)2 and TICsMes. Attempts to replace the halide ligand by a second CsMes or a C5H5 unit remained unsuccessful. The X-ray structure analysis of C5MesPd[P(i-Pr)3]Cl (3) indicates that the five-membered ring shows a tendency of »^-bonding towards the metal. Das Interesse an Pentamethylcyclopentadienyl-metall-Verbindungen ist in den letzten Jahren stän-dig gestiegen, nachdem an zahlreichen Beispielen gezeigt werden konnte, daß die Einführung des CsMes-an Stelle des CsHs-Liganden eine Zunahme der Stabilität der Ring-Metall-Bindung bewirkt [2], In der Reihe der Platinmetalle sind Komplexe mit CsMes vor allem von Rhodium und Iridium darge-stellt und auch strukturell charakterisiert worden; die Arbeiten von P. M. Maitlis und seiner Gruppe haben hier bahnbrechend gewirkt [3]. Im Vergleich dazu ist nur relativ wenig über Pentamethylcyclopentadienylpalladium-Verbindun-gen bekannt. Wir hatten kürzlich gefunden [4], daß bei der Umsetzung der Acetat-verbrückten Zwei-kernkomplexe [Cl(PR3)Pd]2(//-OCOCH3)2 mitTICsHö die Verbindungen (^ 5 -C5H5)Pd(?? 1 -C5H5)PR3 entste-hen, die in Lösung ein fluktuierendes Verhalten zei-gen. Aufgrund von !H-und 13 C-NMR-spektrosko-pischen Messungen sind zwei dynamische Prozesse nachweisbar, wobei der Prozeß mit der größeren Aktivierungsenergie ein nja-(bzw. rf/r] 1 -)-Aus-tausch der beiden unterschiedlich gebundenen Cy-clopentadienylliganden und derjenige mit der kleine-ren Altivierungsenergie eine metallotrope Umlage-rung ist. Die Koaleszenztemperatur für den 
  Reference    Z. Naturforsch. 38b, 733—737 (1983); eingegangen am 1. März 1983 
  Published    1983 
  Keywords    Pentamethylcyclopentadienylpalladium Complexes, Synthesis, Crystal Structure, Bonding Mode 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0733.pdf 
 Identifier    ZNB-1983-38b-0733 
 Volume    38 
142Author    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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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0738.pdf 
 Identifier    ZNB-1983-38b-0738 
 Volume    38 
143Author    Werner Winter, Reinhard Merkel, Udo KunzeRequires cookie*
 Title    Koordinationschemie funktioneller Phosphorylide, V [1] Die Molekülstrukturen der isomorphen Mangan-und Rheniumbromtricarbonyl- komplexe von 2-Methyl-2-(triphenylphosphonio)dithiopropionat Coordination Chemistry of Functional Phosphorus Ylides, V [1] The Molecular Structures of the Isomorphous Manganese and Rhenium Bromotricarbonyl Complexes of 2-Methyl-2-(triphenylphosphonio)dithiopropionate  
 Abstract    The isomorphous crystal structures of the manganese and rhenium bromotricarbonyl complexes 2 a, b have been determined at room temperature (Mn) and at —110 °C (Mn, Re; P2x/c, Z — 4). At room temperature, data collection is accompanied by crystal decomposi-tion, and a cleavage of the PPh3 group is suggested by the results as the primary process. The same initial step is thought to be valid for the photodecomposition in solution. The main structural difference between the free and coordinated betaine ligand 1 is the reduced electrostatic interaction of P and S in the complexed form. Einführung 
  Reference    Z. Naturforsch. 38b, 747—751 (1983); eingegangen am 20. März 1983 
  Published    1983 
  Keywords    Manganese, Rhenium, Betaine Complexes, Dithiocarboxylate Complexes, X-Ray 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0747.pdf 
 Identifier    ZNB-1983-38b-0747 
 Volume    38 
144Author    Franz Dallaeker, Peter Kramp, Wim CoerverRequires cookie*
 Title    Derivatives of 1.3-Benzdioxoles, 49 [1] Preparation and Reactions of 1.3-Benzdioxole-4.5-quinones  
 Abstract    4,5-Dihydroxy-l,3-benzdioxoles, l,3-Benzdioxole-4,5-quinones Treatment of the subst. 4,5-Dihydroxy-l,3-benzdioxoles (la-lm) with silver(I)-carbonate/Celite resp. tetrachloro-l,2-benzoquinone as dehydrogenation agent yields the l,3-benzdioxol-4,5-quinones (2a-2m). These are darkblue or black coloured compounds with a different stability. 
  Reference    Z. Naturforsch. 38b, 752—760 (1983); eingegangen am 13. Dezember 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0752.pdf 
 Identifier    ZNB-1983-38b-0752 
 Volume    38 
145Author    I. Kostova, I. OgnyanovRequires cookie*
 Title    Preparation and Stereochemistry of 12a-Hydroxymethyl Derivatives of Rotenone and Amorphigenin  
 Abstract    A convenient method for the preparation of 12a-hydroxymethyl derivatives of rotenone 1 and amorphigenin 2, possibly applicable to other rotenoids with activated 12a-hydrogen atom is described. The stereochemistry of the products is discussed. 
  Reference    Z. Naturforsch. 38b, 761—763 (1983); received October 8 1982/February 14 1983 
  Published    1983 
  Keywords    12a-Hydroxymethyl Rotenoids, Rotenone, Amorphigenin, Absolute Stereochemistry, NMR Spectra 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0761.pdf 
 Identifier    ZNB-1983-38b-0761 
 Volume    38 
146Author    Mohamed Rifaat, Hamza Elmoghayar, Mohamed Kamal, Ahmed Ibrahim, Mahmoud Mohamed, Mahfouz Ramiz, MohamedHilmy ElnagdiRequires cookie*
 Title    Activated Nitriles in Heterocyclic Syntheses, I Novel Synthesis of Pyrrolones and l,2,4-Triazol-3-oyl nitriles  
 Abstract    Heterocyclic Synthesis, Pyrrolones The behaviour of 4-benzylidene-2-oxazolin-5-one (2) and of 4-phenylazo-2-oxazolin-5-one (3) toward a variety of active methylene reagents is reported. Cleavage of the oxazolin-5-one ring was observed in most cases. A variety of new, otherwise, difficult accessible, azolyl derivatives could be prepared. 
  Reference    Z. Naturforsch. 38b, 764—768 (1983); received January 5 1983 
  Published    1983 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0764.pdf 
 Identifier    ZNB-1983-38b-0764 
 Volume    38 
147Author    Klaus Burger, Stephan Tremmel, Gabriele Trost, Reinhold Simmerl, Dieter HüblRequires cookie*
 Title    Zum Cycloreversionsmechanismus von 3.3-Bis(trifluormethyl)-2.2-dihydro-1.4.2-oxazaphosphol-4-enen [1] Cycloreversion Mechanism of 3,3-Bis(trifluoromethyl)-2,2-dihydro-l,4,2- oxazaphosphol-4-enes [1]  
 Abstract    [3 + 2]-Cycloreversion Reactions, Trifluoromethyl Substituted 1,3-Dipoles, [3 + 2]-Cycloaddition Reactions, 5,5-Difluoro-4-trifluoromethyl-2-oxazolines, 5 -Fluoro -4 -trifluoromethyl -oxazoles 2,2,2-Trimethoxy-3,3-bis(trifluoromethyl)-2,2-dihydro-l,4,2-oxazaphosphol-4-enes on thermolysis undergo a 1,3-dipolar cycloreversion reaction with formation of bis(trifluoro-methyl) substituted nitrile ylides. Trapping reactions of the 1,3-dipolar species with a,/3-unsaturated carboxylic acid esters and nitriles are described. 2-Aryl-3-carbethoxy-5,5-bis(trifluoromethyl)-l-pyrrolines obtained undergo an uncatalyzed autoxidation pro-cess to give 2-aryl-3-carbethoxy-3-hydroxy-5,5-bis(trifluoromethyl)-l-pyrrolines. 5,5-Di-fluoro-4-trifluoromethyl-2-oxazolines and 5-fluoro-4-trifluoromethyl-oxazoles formed as by-products indicate that the thermal induced [3+ 2]-cycloreversion reaction of2,2,2-tri-methoxy-3,3-bis(trifluoromethyl)-2,2-dihydro-l,4,2-oxazaphosphol-4-enes is most likely a stepwise process. 
  Reference    Z. Naturforsch. 38b, 769—780 (1983); eingegangen am 24. Januar 1983 
  Published    1983 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0769.pdf 
 Identifier    ZNB-1983-38b-0769 
 Volume    38 
148Author    Galal Eldin, Hamza Elgemeie, HassanAttia Elfahham, Sanna Mohy, Eldin Hassan, MohamedHilmy ElnagdiRequires cookie*
 Title    Activated Nitriles in Heterocyclic Synthesis: The Reaction of Nitriles with Mercapto Acides  
 Abstract    a-Mercaptocinnamic Acid, 2-Anilinomethyl-2-thiazolin-4-ones, Thiazolo[2,3-a]pyridines 
  Reference    Z. Naturforsch. 38b, 781—785 (1983); received December 23 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0781.pdf 
 Identifier    ZNB-1983-38b-0781 
 Volume    38 
149Author    Bernd Gather, Roger BlachnikRequires cookie*
 Title    "AggSnTee" — Ein neuer stabiler Vertreter der Argyrodite ? "Ag8SnTe6" -a New Stable Argyrodite ?  
 Abstract    Argyrodite, Silver, Tin, Tellurium DTA, X-ray and microprobe measurements show, that the compound "Ag8SnTe6" seems not to be a stable argyrodite. 
  Reference    Z. Naturforsch. 38b, 786—787 (1983); eingegangen am 23. Dezember 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0786_n.pdf 
 Identifier    ZNB-1983-38b-0786_n 
 Volume    38 
150Author    G. Blasse, G. J. DirksenRequires cookie*
 Title    Luminescence of CS3V2O4F5  
 Abstract    The compound CS3V2O4F5 with statistically distributed [V204F5] 3 ~ complexes shows a weak, red emission at low temperatures. This emission is discussed in relation to similar luminescent compounds. 
  Reference    Z. Naturforsch. 38b, 788—789 (1983); received March 9 1983 
  Published    1983 
  Keywords    Luminescence, Vanadate, Niobate, Tungstate 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0788_n.pdf 
 Identifier    ZNB-1983-38b-0788_n 
 Volume    38 
151Author    Ekkehard Lindner, Herbert KernRequires cookie*
 Title    Das Verhalten von Oxalyl-bis ( dipheny lposphan ) gegenüber Sauerstoff The Behaviour of Oxalyl-bis(diphenylphosphane) Towards Oxygen  
 Abstract    Oxidation of Oxalyl-bis(diphenylphosphane), Mechanism In dependence of the solvent, oxalyl-bis-(diphenylphosphane) (1) is oxidized with mole-cular oxygen either in a radical or an ionic mechanism to give -via the radicals 'PPl^ and the recombination products [-PPh2]2 (3) -the oxide [Ph2P(0)]2 (4) and [Ph2P(0)]20 (6), respectively. In both cases CO and CO2 are eliminated in nearly equal amounts. 
  Reference    Z. Naturforsch. 38b, 790—792 (1983); eingegangen am 28. Januar 1983 
  Published    1983 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0790_n.pdf 
 Identifier    ZNB-1983-38b-0790_n 
 Volume    38 
152Author    Armand Blaschette, Gerlinde SeurigRequires cookie*
 Title    Produkt der Reaktion von Tetramethylsilan mit Imido-bis(schwefelsäurechlorid) Investigations on Bis(methylsulphonyl)- amine (Dimesylamine), V [1] N-Chlorosulphonyl-methanesulphonamide: A Reaction Product from Tetramethylsilane and Imido-bis(sulphuryl chloride)  
 Abstract    Tetramethylsilane, Imido-bis(sulphuryl chloride), N-Chlorosulphonyl-methanesulphonamide Tetramethylsilane reacts with HN(S02C1)2 (1) in a complex manner, the nature of the product mixture depending strongly on the reaction conditions. Refluxing 1 with TMS in excess, using CH2CI2 as a diluent, affords in high yield the new compound HN(S02Cl)(S02Me) (2) according to eq. (3). Hydrolysis of the crystal-line, moisture sensitive compound 2 is described by eq. (4). 
  Reference    Z. Naturforsch. 38b, 793—794 (1983); eingegangen am 28. Februar 1983 
  Published    1983 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0793_n.pdf 
 Identifier    ZNB-1983-38b-0793_n 
 Volume    38 
153Author    Uddin Ahmad, Shaheen Bano, Wolfgang Voelter, W. FuchsRequires cookie*
 Title    Viqar  
  Reference    Z. Naturforsch. 38b, 795—1676 (1983) 
  Published    1983 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0795_e.pdf 
 Identifier    ZNB-1983-38b-0795_e 
 Volume    38 
154Author    Fritz Seel, Norbert KleinRequires cookie*
 Title    N-Methylcarbamoylphosphate, I. Synthese N-Methylcarbamoyl Phosphates, I. Synthesis  
 Abstract    Solutions of mono-and bis-N-methylcarbamoyl phosphates in non-aqueous solvents [e.g. acetonitrile, dimethyl formamide, chloroform) and, surprisingly, even in water are readily obtained by the reaction of methyl isocyanate with the solution of an appropriate mono-or dihydrogenphosphate. The course of the reactions and the limited stability of N-methylcarbamoyl phosphate ions in solutions can be monitored through 31 P NMR measurements. Various types of compounds, including a coordination compound of cobalt could.be isolated in crystalline form: [Et3NH]HX, KHX, NH4HX, Na2X • H20, MgX • 4 H20, CaX • H20, SrX • 2 HaO, BaX • H20, ZnX • 5 H20, CdX • 2 H20, [(NH3)5COX]C104, [EtsNHjY, AgY • MeCN, X = MeNHC(0)0P03, Y = [MeNHC(0) 0]2P02. 
  Reference    Z. Naturforsch. 38b, 797—803 (1983); eingegangen am 24. Februar 1983 
  Published    1983 
  Keywords    N-Methylcarbamoyl Phosphates, Preparation, NMR Spectra 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0797.pdf 
 Identifier    ZNB-1983-38b-0797 
 Volume    38 
155Author    Fritz Seel, N. KleinRequires cookie*
 Title    Bildung von Amidophosphaten und Amidophosphorsäure aus N-Methylcarbamoylphosphaten Formation of Amidophosphates and Amidophosphoric Acid from N-Methylcarbamoyl Phosphates  
 Abstract    The synthesis of various amidophosphates can be readily accomplished in aqueous solutions by the reaction of amines with solutions of sodium, potassium or ammonium N-methylcarbamoyl phosphate, prepared by the reaction of methylisocyanate with the corresponding hydrogen phosphates. Procedures for the synthesis of NH4[03PNH3] and Ca[03PNH2CH3]2 • 4 H20 are described in detail. 
  Reference    Z. Naturforsch. 38b, 804—807 (1983); eingegangen am 24. Februar 1983 
  Published    1983 
  Keywords    Amidophosphates, Amidophosphoric Acid, N-Methylcarbamoyl Phosphates 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0804.pdf 
 Identifier    ZNB-1983-38b-0804 
 Volume    38 
156Author    Wilhelm Isenberg, NaylaK. Homsy, Jens Anhaus, HerbertW. Roesky, GeorgeM. SheldrickRequires cookie*
 Title    Synthese und Struktur von N2S3C1 + SbCI^ Synthesis and Structure of N2S3C1+ SbCl6~  
 Abstract    N2S3C1+ SbClö -was prepared by chlorination of N4S4 • SbCls with elemental chlorine. The crystals are monoclinic, P2i/c, with a = 1492.4(4), b = 1233.6(2), c = 1437.5(4) pm, ß = 91.40(2)°, and R = 0.059 for 3663 observed reflections. There are two independent cations and anions in the asymmetric symmetric unit. The appreciable interionic inter-action results in a high density of q = 2.642 g • cm -3 (calcd). In einer vorausgegangenen Arbeit berichteten wir u.a. über Reaktionen des Chlortrithiadiazylchlorids 1 mit Lewis-Säuren [1], Bei diesen Reaktionen wird im allgemeinen nur das ionogen gebundene Cl sub-stituiert, so daß sich Verbindungen der Formel N2S3C1+ MCI4-(M = AI, Fe) ergeben. Lediglich SbCls reagiert mit 1 unter Substitution beider Cl zu N2S3(SbCle)2. Die Bildung der monosubstituierten Verbindung N2S3C1+ SbCls -2 wurde nicht beob-achtet. Nun gelang uns die Darstellung von 2 durch Chlorierung des Addukts N4S4 • SbCls [2] mit ele-mentarem Chlor. Experimenteller Teil 
  Reference    Z. Naturforsch. 38b, 808—810 (1983); eingegangen am 25. März 1983 
  Published    1983 
  Keywords    Chlorotrithiadiazol, Hexachloroantimonate, Crystal Structure 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0808.pdf 
 Identifier    ZNB-1983-38b-0808 
 Volume    38 
157Author    Martin Pfisterer, Günter NagorsenRequires cookie*
 Title    Bindungsverhältnisse und magnetische Eigenschaften ternärer Arsenide ET2As2 Bonding and Magnetic Properties in Ternary Arsenides ET2AS2  
 Abstract    The interatomic distances of ternary arsenides ET2AS2 with ThCr2Si2-structure were determined by X-ray powder methods (E = Ca, Sr, Ba; T = Cr, Fe, Co, Ni, Cu). The phases were found to behave according to the Zintl-Klemm-Busmann concept. Magnetic susceptibilities were measured. 
  Reference    Z. Naturforsch. 38b, 811—814 (1983); eingegangen am 21. März 1983 
  Published    1983 
  Keywords    Ternary Arsenides, Crystallographic Data, Magnetic Properties 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0811.pdf 
 Identifier    ZNB-1983-38b-0811 
 Volume    38 
158Author    Willy Gombler, RyszardW. Kinas, WojciechJ. StecRequires cookie*
 Title    31 P-15 N Coupling Constants and 15 N/ 14 N Isotope Effects on 31 P NMR Chemical Shifts of 2-Phenylamino-2-oxo(-thioxo, -selenoxo)- 4-methyl-l,3,2-dioxaphosphorinanes and Related Compounds 31P-15N Coupling Constants, 15 N/ 14 N Isotope Effect, 15 N Chemical Shifts, 1,3,2 -Dioxapho sphorinanes  
  Reference    Z. Naturforsch. 38b, 815—818 (1983); received March 21 1983 
  Published    1983 
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 Identifier    ZNB-1983-38b-0815 
 Volume    38 
159Author    Hans Sohr, Günter Hanschmann, Hermann UtschikRequires cookie*
 Title    Thermoanalytische, IR-spektroskopische und quantenchemische Untersuchungen an Kristallmodifikationen des Trichlorphons Thermo-analytical, IR-spectroscopical and Quantum-chemical Investigations on Crystal Modifications of Trichlorphone  
 Abstract    Several modifications of trichlorphone can be prepared by recrystallizing the raw substance from various solvents under special conditions. One of these modifications is obviously an optical isomer. The different thermo-analytical behavior of the modifications is probably due to the relative content of distinct dimer species. This interpretation is supported by quantum-chemical calculations and by analysis of infrared spectra. Die phosphor-organische Verbindung 2.2.2-Tri-chlor-1 -hydroxyethyl-dimethyl-phosphonat (Tri-chlorphon, Metrifonat) ist ein seit etwa 30 Jahren bekanntes Insektizid [1], das auch als Arzneimittel für die Behandlung von Schistosomiasis eingesetzt wird [2]. Diese im folgenden als Trichlorphon be-zeichnete Substanz hat nach Schräder [3] einen Schmelzpunkt von 356-357 K. In den meisten Fäl-len hegen jedoch die von verschiedenen Autoren angegebenen Schmelzpunkte um 348-351 K. Bei der Reinigung von Trichlorphonproben durch Umkristallisieren stellten wir fest, daß man je nach den gewählten Bedingungen mehrere Kristallfor-men erhält, deren Schmelzpunkte zwischen 343 und 383 K variieren. Über die Erscheinung der Polymorphie beim Tri-chlorphon sind uns aus der Literatur keine Hinweise bekannt. Das Ziel unserer Untersuchungen war es deshalb, mit Hilfe strukturanalytischer Methoden eine Erklärung für die beobachteten Schmelzpunkts-differenzen zu finden. Von den bisher publizierten physikochemischen Eigenschaften der Substanz sind neben den zahl-reichen Schmelzpunkten hauptsächlich die optische Aktivität und die Bimolekularität als Ausgangs-punkt für eine Strukturanalyse von Bedeutung. Brienne und Jacques [4] gelang die präparative Dar-stellung einer optisch aktiven Form (Drehung [a] 
  Reference    Z. Naturforsch. 38b, 819—824 (1983); eingegangen am 29. November 1982/11. März 1983 
  Published    1983 
  Keywords    Differential Thermal Analysis, IR Spectra, Quantum Chemistry, Polymorphism, Trichlorphone 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0819.pdf 
 Identifier    ZNB-1983-38b-0819 
 Volume    38 
160Author    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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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0825.pdf 
 Identifier    ZNB-1983-38b-0825 
 Volume    38 
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