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1983 (307)
161Author    Michel Geoffroy, Akilesh Jain, Alice Celalyan, Gerald BernardinelliRequires cookie*
 Title    Interaction between Acetyltetralone and Cu(II) Ions: X-Ray Diffraction of the Ligand and Single Crystal ESR Study of the Complex  
 Abstract    X-Ray, ESR, Acetyltetralone, Cu(II) Organic Complexes. Single crystals of acetyltetralone grown from a solution containing a small amount of Cu(II) ions are studied by ESR. The corresponding g, 63 Cu magnetic and quadrupolar hyperfine tensors are obtained and are consistent with the trapping of a square planar copper(II) complex. X-ray diffraction shows that pure acetyltetralone crystallizes in the orthorhombic space group Pbca (a — 8.893 A, b = 20.301 X, c = 10.715 A). Comparison of the ESR eigenvectors with the bond directions obtained from this crystal structure study shows that the Cu(II) complex experiences some constraint from the crystal matrix. The present complex is a model for one of the complexation sites of tetracyclines. 
  Reference    Z. Naturforsch. 38b, 830—834 (1983); received April 5 1983 
  Published    1983 
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 Identifier    ZNB-1983-38b-0830 
 Volume    38 
162Author    Dirk Walther, Eckhard Dinjus, Joachim Sieler, NguyenNgoc Thanh, Wolfgang Schade, Ivan LebanRequires cookie*
 Title    Aktivierung von C02 an Übergangsmetallzentren: Struktur und Reaktivität eines C-C-Kopplungsproduktes von C02 und 2.3-Dimethylbutadien am elektronenreichen Nickel(O) Activation of CO2 at Transition Metal Centers: Structure and Reactivity of a C-C-Coupling Product of CO2 and 2,3-Dimethylbutadiene at Electron-Rich Nickel(O)  
 Abstract    Carbon Dioxide, 2,3-Dimethylbutadiene, Nickel(II) Complex, Crystal Structure Carbon dioxide reacts with 2,3-dimethylbutadiene and bis-cyclooctadiene(l,5)-nickel(0) in the presence of N,N'-tetramethyl-ethylendiamine (tmeda) to form [(3,4,5-r? 3)-3,4-dimethyl-3-pentenylato](N,N'-tetramethyl-ethylendiamine)-nickel(II) as the product of the oxidative coupling of CO2 and the diene. The deep red complex crystallizes in the rhombic space group Pbca. The structure was determined by an X-ray analysis. The monodendate carboxylate group, the .-7;-allyl system and a N-atom of tmeda form a planar coordination sphere around the central atom. The distance between Ni and the second N-atom of tmeda is very long (2.314 A). Reaction of the complex with R-X (R: H, CH3) yield 3-unsaturated carboxylic acids; tmeda can be substituted by 2,2'-bipyridine. 
  Reference    Z. Naturforsch. 38b, 835—840 (1983); eingegangen am 24. Februar 1983 
  Published    1983 
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 Identifier    ZNB-1983-38b-0835 
 Volume    38 
163Author    CorneliusG. Kreiter, Hans KurzRequires cookie*
 Title    Photochemische Reaktionen von Übergangsmetall-Olefin-Komplexen, VII [1] Die Reaktion von Triearbonyl-^ 6 -cyclooctatetraen-chrom(0) mit 6-mono-und 6.6-disubstituierten Fulvenen Photochemical Reactions of Transition Metal Olefin Complexes, VII [1] The Reactions of Tricarbonyl-^ 6 -cyclooctatetraene-chromium(0) with 6-Mono-and 6,6-Disubstituted Fulvenes r/ 3 -Cyclooctatrienylene-^ 5 -cyclopentadienylidene-methane Chromium Complexes, Derivatives  
 Abstract    Tricarbonyl-?7 6 -cyclooctatetraene-chromium(0) (1) reacts photochemically with 6-mono-and 6,6-disubstituted fulvenes (2-7) in a substitution-oxidative rearrangement-reaction to dicarbonyl-^-l'-3': l"-5"-(cycloocta-2 / ,4',6'-trien-l',8'-ylene-cyclopentadienylidene-meth-ane)chromium complexes (8-13). Tricarbonyl-r^-6,6-dimethylfulvene-chromium(0) (16) reacts with cyclooctatetraene, bicyclo[6,l,0]nona-2,4,6-triene and anti -9-methoxybicy clo-[6,l,0]nona-2,4,6-triene in a similar manner and forms 8 and 2-bicyclo[6,l,0]nona-4',6'-dien-2',3'-ylene-2-cyclopentadienylidene-propane complexes (19, 20). In addition to 13 6-dimethylaminofulvene (7) yields with 1 dicarbonyl-jj-1',6',7': l"-5"-(2-cyclohepta-2',4', 6' -trien-7'-ylidene -1 -cyclopentadienylidene -1 -dimethylamino-ethane) -chromium (14) which involves an unexpected contraction of the eight-membered ring. The constitutions of 8-15 and 19-20 were determined by IR and NMR spectroscopy. In Cr(CO)2[C(C6H5)2(C5H4)(C8H8)] (9) one of the phenyl groups shows hindered rotation around its two fold axis. 
  Reference    Z. Naturforsch. 38b, 841—848 (1983); eingegangen am 1. März 1983 
  Published    1983 
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 Identifier    ZNB-1983-38b-0841 
 Volume    38 
164Author    Roland Schmidt, Wolfgang Hiller, Gerhardt PausewangRequires cookie*
 Title    Peroxofluorokomplexe der Übergangsmetalle, V [1-3]  
 Abstract    Kristallstruktur von K2Ti(02)F4 • H20 (orange) mit einem Di(/i-fluoro)diperoxo-hexafluorodititanat(IV)-Anion Transition Metal Peroxofluoro Complexes, V [1-3] Crystal Structure of K2Ti(02)F4 • HcO (orange) with a Di(J«-fluoro)diperoxo-hexafluorodititanate(IV) Anion Orange crystals of K2Ti(02)F4 ' H20 have been obtained from aqueous solution. The crystal structure (space group P2i/n, a = 604.3(3), b = 1424.6(4), c = 761.0(2) pm, ß = 103.98°, Z = 4, dc = 2.63 gem-3 , dm = 2.62 gem-3 , R = 0.051 for 2257 independent reflections) shows isolated di(ja-fluoro)-bridged [Ti2(02)2Fg] 4 -anions, which are inter-connected by hydrogen bonded H20 forming infinite chains. 
  Reference    Z. Naturforsch. 38b, 849—851 (1983); eingegangen am 17. März 1983 
  Published    1983 
  Keywords    K2Ti(02)F4 @BULLET H20, Crystal Structure, Preparation, Properties 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0849.pdf 
 Identifier    ZNB-1983-38b-0849 
 Volume    38 
165Author    Henri Brunner, Beate SchönhammerRequires cookie*
 Title    Optisch aktive Übergangsmetall-Komplexe, 84 [1] Substituenten-Effekte in Diastereomerengleichgewichten von quadratisch-pyramidalen Mo -Komplexen Optically Active Transition Metal Complexes, 84 [1] Substituent Effects in Diastereomer Equilibria of Square-Pyramidal Mo Complexes  
 Abstract    Diastereoisomers, Separation, Asymmetrie Induction I 1 Amidinato complexes (RC5H4)(CO)2MoN(CH2C6H5)C(C6H5)NCH(CH3)C6H4R , with sub-stituents R at the cyclopentadienyl and R' in the ^-position of the phenyl at the asym-metric C atom were synthesized and characterized. The diastereomers differing in their 1 H NMR spectra were partly separated by fractional crystallization. After equilibration with respect to the labile Mo configuration the diastereomer ratio, a measure for the asymmetric induction from the chiral ligand on the formation of the two Mo configura-tions at equilibrium, was determined by 1 H NMR integration. The diastereomer ratio decreases for substituents R' = F and R = CH3, and increases for R' = OCH3, com-pared to the unsubstituted compound. 
  Reference    Z. Naturforsch. 38b, 852—857 (1983); eingegangen am 1. Februar 1983 
  Published    1983 
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 Identifier    ZNB-1983-38b-0852 
 Volume    38 
166Author    A. M. El-Wakil, M. S. Soliman, A. B. FaragRequires cookie*
 Title    Quantum Chemical Interpretation of the Photoinitiated Autoxidation of Sulphite Catalysed by Ferric Ions  
 Abstract    Autoxidation of sulphite is the first well known chain reaction proceeding through free radicals in solutions. Dark and photochemical autoxidation of sulphite were stated to take place by the same mechanism except in the initial steps. It was found that the formation of sulphite radicals in photoinitiated autoxidation of sulphite which is a metal catalysed reaction as well as the classical thermal reaction is due to the absorption of photons by ferrisulphite complexes rather than sulphite itself. Confirmation of this finding was achieved spectrophotometrically as well as by the fact that such complexes are specified by very high stability constants. The present work is a further evidence for the presence of such complexes and to cover the gap present before in the literature data. Quantum mechanical calculations using the extended Hückel molecular orbital method has proved that the range of absorption by sulphite lies in a region at which sulphite alone does absorb at all, and the absorption process is thus due to the formation of ferrisulphite complexes. 
  Reference    Z. Naturforsch. 38b, 858—860 (1983); received March 11 1983 
  Published    1983 
  Keywords    Photoinitiation, Autoxidation, Sulphite Ferric Ion, Sensitization, Quantum Chemical Interpretation 
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 Identifier    ZNB-1983-38b-0858 
 Volume    38 
167Author    HansJürgen Bestmann, Helmut OechsnerRequires cookie*
 Title    Reaktionen des Hexaphenylcarbodiphosphorans, IV [1] Reaktionen des Hexaphenylcarbodiphosphorans mit Halogenverbindungen. Diphosphaallylkationen Reactions of Hexaphenylcarbodiphosphorane, IV [1] Reactions of Hexaphenylcarbodiphosphorane with Halogen Compounds. Diphosphaallyl Cations  
 Abstract    Hexaphenylcarbodiphosphorane Diphosphaallyl Cations, 13 C NMR Spectra Hexaphenylcarbodiphosphorane (1) undergoes nucleophilic displacement reaction with halogen compounds 3 with formation of compounds 5 which can be regarded as salts of the diphosphaallylcation. 1 reacts with bromoacetic ester 11 as base, with proton abstrac-tion and formation of a carbanion 12 which gives rise to formation of (E)-cyclopropan-tricarboxylicacid ester (13). In an analogous way, 1 attacks isothiocyanatoaceticacid ester (14) with formation of an ionpair 15 which undergoes a cycloaddition with a second molecule 14 forming 16, which can be converted into the mercaptothiazol derivative 17 by treatment with HCl. 
  Reference    Z. Naturforsch. 38b, 861—865 (1983); eingegangen am 9. März 1983 
  Published    1983 
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 Identifier    ZNB-1983-38b-0861 
 Volume    38 
168Author    A. Römer, M. SammetRequires cookie*
 Title    Synthesis of Substituted Phenazines from Benzofurazanoxid and Hydroquinones [1]  
 Abstract    The sterical course of the formation of substituted phenazines from benzofurazanoxid and hydroquinone derivatives was investigated. The additional functional group of the hydroquinone determines the substitution pattern and the product ratio of the phenazines formed. 
  Reference    Z. Naturforsch. 38b, 866—872 (1983); eingegangen am 28. Februar 1983 
  Published    1983 
  Keywords    Phenazine, Synthese, Hydrochinone 
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 Identifier    ZNB-1983-38b-0866 
 Volume    38 
169Author    Wolf-H GündelRequires cookie*
 Title    Untersuchungen an quartären Pyridinium-Salzen, XV [1] Pseudobasen und Redoxprodukte bei der Umsetzung von Pyridinium-Salzen mit Alkoholat Investigations of Quaternary Pyridinium Salts, XV [1] Pseudobases and Redox Products in the Reaction of Pyridinium Salts with Alcoxides  
 Abstract    Mono-and diquaternary pyridinium salts substituted in 3-position with electron with-drawing groups, react with alcohols under basic conditions to give 6-alcoxy-l,6-dihydro-pyridines. Symmetric dipyridinium salts react in aqueous alkaline solution to products with 6-pyridone and dihydropyridine moiety. This redox reaction depends on the length of the bridge connecting the pyridinium rings. Pyridinium salts can be reduced by aluminiumtriisopropoxide to 1,4-dihydropyridines. 
  Reference    Z. Naturforsch. 38b, 873—883 (1983); eingegangen am 21. Februar 1983 
  Published    1983 
  Keywords    Pyridinium Salts, Insertion Reaction, Redox Reaction 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0873.pdf 
 Identifier    ZNB-1983-38b-0873 
 Volume    38 
170Author    George Sosnovsky, Jan LukszoRequires cookie*
 Title    In the Search for New Anticancer Drugs, III+ Phosphorylated Diaziridine Derivatives  
 Abstract    Several N-diethoxyphosphoryl derivatives 7 of various diaziridines, and compounds 12, 15a, lob, 18 and 20, structurally related to TEPA (la) and spin labeled Thio-TEPA (lc) were synthesized. 0 Me 0 N-P(0Et) 2 HC=NN-p(<]) o / NR ' • 11 f / 1 ? R-O-P-f N —C—R X R N—R CL N "2 Me Me 7: R 1 . R 3 = alkyl 12 15a: R 1 = R 2 =R 3 =Me R 2 =H, alkyl 15b: R' = H,R 2 R 3 =-|CH2|5-N-0 Me Me In three cases, attempts to synthesize phosphorylated diaziridine derivatives resulted in rearrangements to give the corresponding phosphorylated hydrazone derivatives 11 h, Hi and 12. Me 0 CH = NN — P(0Et)j 11 h: x= H 11 i : x = ci 13 C NMR spectroscopy was shown to be a valuable tool in distinguishing between the structures of diaziridine and hydrazone derivatives. The in vivo testing of five representa-tive compounds (7e, 12, 15a, 16 and 20) against murine lymphocytic leukemia P 388 showed a lack of antitumor activity of compounds 7e, 15 a, 16 and 20, and an activity of compound 12 as evidenced by a T/C value of 194 and a % ILS of 94, at a dose of 32 mg/kg. 
  Reference    Z. Naturforsch. 38b, 884—894 (1983); received August 30/December 24 1982 
  Published    1983 
  Keywords    Phosphorylated Diaziridines, Synthesis, Anticancer Drugs, Leukemia P 388 
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 Identifier    ZNB-1983-38b-0884 
 Volume    38 
171Author    Hans Hofmann, Rainer Heidrich, Andreas Seubert, Herrn Prof, G. Dr, HesseRequires cookie*
 Title    Heterocyelische Siebenring-Verbindungen, XXVI [1] Darstellung und photochemische Reaktion einiger substituierter 4-Phenyl-l-benzoxepine Heterocyclic Seven-membered Ring Compounds, XXVI [1] Synthesis and Photochemical Reaction of Several 4-Phenyl-l-benzoxepins  
 Abstract    Substituted 4-Phenyl-l-benzoxepins, Photorearrangement, Substituted 1 -Phenyl-2 a,7 b-dihydrocyclobuta[b] 1 -benzofurans 
  Reference    Z. Naturforsch. 38b, 895—898 (1983); eingegangen am 21. März 1983 
  Published    1983 
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 Identifier    ZNB-1983-38b-0895 
 Volume    38 
172Author    Jürgen Evers, Gilbert Oehlinger, Armin WeissRequires cookie*
 Title    Single Crystal Data of the High Pressure-High Temperature Phase of SrSi2  
 Abstract    The high pressure-high temperature phase of SrSi2 is a stoichiometric representative of the a-ThSi2 type of structure. A single crystal in-vestigation leads to interatomic distances Si-Si: 233.0(2) pm (1 x) and 248.9(2) pm (2 x), Sr-Si: 319.1(4) pm (4 x) and 334.7(4) pm (8 x), Sr-Sr: 410.8(3) pm (4 x) and 443.8(3) pm (4 x). 
  Reference    Z. Naturforsch. 38b, 899—900 (1983); eingegangen am 11. April 1983 
  Published    1983 
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 Identifier    ZNB-1983-38b-0899_n 
 Volume    38 
173Author    Doris Bodenstein, Axel Brehm, PeterG. Jones, Einhard Schwarzmann, GeorgeM. SheldrickRequires cookie*
 Title    Darstellung und Kristallstruktur von monoklinem Arsen(III)antimon(III)oxid, AsSb03 Preparation and Crystal Structure of Monoclinic Arsenic(III) Antimony(III) Oxide, AsSb03  
 Abstract    Antimony(III), Arsenic (III), Oxide, Crystal Structure Monoclinic AsSb03 was prepared by heating an equimolar mixture of As203 and Sb203 to 670 K in an evacuated quartz tube. The crystal structure was determined [P2ijn, a = 458(1), b = 1316(2), c = 544(1) pm, ß = 95.0(1)°, Z = 4, R = 0.055 for 745 reflections] and found to be isostructural with the As203 modification claudetite I. Mean As-O and Sb-0 bond lengths are 180 and 195 pm, respectively. There is no crystallographic evidence for any significant As/Sb disorder. 
  Reference    Z. Naturforsch. 38b, 901—904 (1983); eingegangen am 22. April 1983 
  Published    1983 
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 Identifier    ZNB-1983-38b-0901 
 Volume    38 
174Author    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 
175Author    Klaus Brodersen, Hans-U HummelRequires cookie*
 Title    Die Kristallstrukturell von CaHg(SCN)4 * /ili20 (n = 2,3). Verwandtschaftsbeziehungen zwischen den Verbindungsklassen der Tetrathiocyanatomercurate(II) von Erdalkaliionen und 3 d-Metallionen The Crystal Structures of CaHg(SCN)4 * MH20 (n = 2, 3). Relations between Tetrathiocyanatomercurates(II) of the Alkaline-Earth-Ions and Ions of the 3 d-Type  
 Abstract    CaHg(SCN)4 • nH20 (n — 2(1), n = 3(2)) were isolated from an aqueous solution of Ca(NCS)2 • 4H20 and Hg(SCN)2. 1 is compared with the analogous MgHg(SCN)4 • 2H20 by means of powder patterns. The crystal structure of 2 has been determined. 2 is mono-clinic, space group P2i/c with a = 9.469(4), 6 = 22.781(5), c = 6.587(4) A, 0 = 93.6(3)°, Z = 4, dc = 2.46 g-cm -3 . The structure was refined to .ß=7.42 and i?w = 4.96% for 1224 independent reflec-tions. The species MHg(SCN)4 • 2H20 (M = Mg, Ca, Ni) contain nearly tetrahedral Hg(SCN)4 and octahedral M(OH2)2(NCS)4 groups which are joined by Hg-SCN-M bridges. In contrast the structures of the other compounds MHg(SCN)4 • nH20 (M = Co, n = 0; M = Ca, Sr, n = 3) are based on the diamond net. There is tetrahedral coordination of all the metal atoms, M having 4 N and Hg 4 S nearest neighbours. In the hydrates the H20 molecules are situated additionally at the Ca and Sr atoms [*]. 
  Reference    Z. Naturforsch. 38b, 911—916 (1983); eingegangen am 20. April 1983 
  Published    1983 
  Keywords    Calciumtetrathiocyanatomercurates(II), Dihydrate, Trihydrate, X-Ray 
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 Identifier    ZNB-1983-38b-0911 
 Volume    38 
176Author    H.-H Fricke, W. PreetzRequires cookie*
 Title    Darstellung und spektroskopische Charakterisierung von Hexaisothiocyanatoruthenat(III) Preparation and Spectroscopic Characterisation of Hexaisothiocyanatoruthenate(III)  
 Abstract    Hexaisothiocyanatoruthenate(III), IR, Raman, UVS Spectrum The reaction of RuCfo • 3 H2O with aqueous KSCN does not yield [Ru(NCS)6] 3-as supposed previously, but a mixture of bond isomeric complexes [Ru(NCS)ra(SCN)6-n] 3 ~, n—1-4. On prolonged heating of the solid tetrabutylammonium(TBA)-salts of this mixture (TBA)3[Ru(NCS)s(SCN)] is formed, which decomposes above 130 °C. By an-nealing the more stable bis-triphenylphosphineiminium(PNP) salts up to 160 °C the complex mixture is rearranged to (PNP)3[Ru(NCS)6]-On stirring the emulsion of the (PNP) compound in ethanol with a 100-fold excess of (TBA)Br, (TBA)3[Ru(NCS)6] is obtained. The IR and Raman spectra are assigned according to the point symmetry Oh of the complex ion. 
  Reference    Z. Naturforsch. 38b, 917—920 (1983); eingegangen am 4. Mai 1983 
  Published    1983 
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 Identifier    ZNB-1983-38b-0917 
 Volume    38 
177Author    Brigitte Eisenmann, Herbert Schäfer, Heike SchrodRequires cookie*
 Title    Über das o-Natriumtelhirostannat(rV) Na4SnTe4 On the o-Sodium-tellurostannate(IV), Na4SnTe4  
 Abstract    The new compound Na4SnTe4 crystallizes in the orthorhombic system, space group P2i2i2i with lattice constants a = 865.8(5) pm, 6 = 884.0(5) pm, and c = 1526.9(8) pm. In the structure there are isolated SnTe4 4 ~-tetrahedra. In seinen binären Chalkogenverbindungen tritt das Zinn gegenüber 0, S und Se in den beiden Oxi-aationsstufen 11+ und IV + auf, während mit Tellur bisher nur das SnTe charakterisiert werden konnte. Auch in ternären Telluriden ist mit Aus-nahme des AggSnTee [1, 2] und des K2SnTe5 [3] Zinn in der Oxidationsstufe IV+ gegenüber Tellur unbekannt. Es überrascht daher, daß sich die Ver-bindung Na4SnTe4, wie wir jetzt fanden, in glatter Reaktion aus den Elementen synthetisieren läßt. Darstellung Zur Darstellung wurden die Elemente in stöchio-metrischen Anteilen unter feuchtigkeits-und sauer-stofffreier Argonatmosphäre in eine bei 150 °C vor-getrocknete Quarzampulle eingewogen. Dabei mußte das Natrium, um den Verlust durch die Reaktion mit dem Gefäßmaterial auszugleichen, nach empi-rischem Befund im Überschuß von ca. 15 Gew.-% zugesetzt werden. Die Ampullen wurden eva-kuiert, abgeschmolzen und in mit Argon gefüllten 
  Reference    Z. Naturforsch. 38b, 921—923 (1983); eingegangen am 17. Mai 1983 
  Published    1983 
  Keywords    o-Sodiumtellurostannate(IV), Preparation, Crystal Structure 
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 Identifier    ZNB-1983-38b-0921 
 Volume    38 
178Author    Brigitte Eisenmann, Herbert Schäfer, Heike SchwererRequires cookie*
 Title    Ringförmige [(GeTe2)4Te2] 8 -Anionen im Na8Ge4Te10(II) Cyclic [(GeTe2)4Te2] 8 -Anions in Na8Ge4Tei0(II)  
 Abstract    Na8Ge4Teio exists in two modifications I and II, of which structure I was determined previous by [3]. Modification II crystallizes in the triclinic system, space group P I with the lattice constants: a = 1070.1(5) pm, b = 963.9(5) pm, c = 792.3(4) pm a = 67.9(1)°, ß = 70.7(1)°, y = 68.3(1)°. In the structure there are [Ge4Teio] 8_ anions in the form of six-membered rings [(GeTe2)4Te2] 8_ . 
  Reference    Z. Naturforsch. 38b, 924—929 (1983); eingegangen am 9. Mai 1983 
  Published    1983 
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 Identifier    ZNB-1983-38b-0924 
 Volume    38 
179Author    Dierk KnittelRequires cookie*
 Title    Reaktionen von a-Ketoaziden mit N,N-Dimethylamino-nitrosobenzol Darstellung von a-Imino-ß-ketonitrilen und deren Redoxeigenschaften Reactions of a-Ketoazides with N,N-Dimethylamino-nitrosobenzol Synthesis of a-Imino-/?-Ketonitriles and their Redox Properties  
 Abstract    A survey about the reaction between a-azidoacetophenones with aromatic nitroso compounds is given. The synthesis of a-imino-/?-ketonitriles and some electrochemical properties of this class are described. 
  Reference    Z. Naturforsch. 38b, 930—933 (1983); eingegangen am 15. Mai 1983 
  Published    1983 
  Keywords    a-Ketoazides, Iminoketonitriles, Cathodic Reduction 
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 Identifier    ZNB-1983-38b-0930 
 Volume    38 
180Author    FranzL. Dickert, Walter GumbrechtRequires cookie*
 Title    Komplexbildung und Ligandenfluktuation im System Co (II) / [18] Krone-6 Complex Formation and Ligand Fluctuation in the System Co(II)/[18]crown-6  
 Abstract    The ligand properties of [18]crown-6 towards Co(II) ions were studied by iH and 13 C NMR spectroscopy in nitromethane and nitromethane/methanol. The complexes [Co([18]crown-6)] ++ and mer-[Co([18]crown-6)(CH30H)3] ++ which were detected in solu-tion show ligand fluctuations on the NMR time scale. For the mixed complex a crown ether rotation occurs. Additionally, a synchronous process between the movement of the macrocyclic ligand and the dissociation reaction of methanol from the metal ion is observed. 
  Reference    Z. Naturforsch. 38b, 934—937 (1983); eingegangen am 28. März/27. April 1983 
  Published    1983 
  Keywords    Crown Ether, Complex Formation, Ligand Fluctuation, NMR Spectroscopy 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0934.pdf 
 Identifier    ZNB-1983-38b-0934 
 Volume    38 
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