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1988 (283)
61Author    O. H. Hishmat, S. S. Mabrouk, A.M M Nasef, N.M A Shayeb, S. A. IsmailRequires cookie*
 Title    Derivatives of Khellinonequinone and their Aflatoxigenic Activity  
 Abstract    Khellinonequinone. Aflatoxigenic Activity Nitration of khellinone leads to the formation of a small amount of 3-nitrokhellinone and 5-acetyl-6-hydroxybenzofuran-4.7-dione (khellinonequinone) as a main product. The latter com-pound reacts with primary amines to give the corresponding imino compounds. Reaction of khellinone with o-phenylenediamine involves condensation followed by cyclisation. While on the other hand treating with phenyl hydrazines gives the phenyl hydrazone. The pyrazolobenzofuran derivative was obtained by the action of hydrazine hydrate on khellinonequinone. Finally the reaction with malononitrile leads to the formation of the ylidene derivative. Two quinone deriva-tives showed a weak effect on mycelial growth and aflatoxin formation. 
  Reference    Z. Naturforsch. 43b, 343—346 (1988); received June 11/September 28 1987 
  Published    1988 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-0343.pdf 
 Identifier    ZNB-1988-43b-0343 
 Volume    43 
62Author    Willy Friedrichsen, B.-Michael König, Tony DebaerdemaekerRequires cookie*
 Title    Reaktionen mesoionischer Fünfringheterocyclen mit 0-chinoiden Verbindungen  
 Abstract    , VII [1] Thermische [;r4+;r4]-Cycloadditionen eines bicyclischen Imidazolo[l,2-c]thiazolsystems Reactions of Mesoionic Five-Membered Heterocycles with o-Quinoid Compounds, VII fl] Thermal [;r4+,T4]Cycloadditions of a Bicyclic Imidazolo[l,2-c]thiazole System [jt4 + ;r4]Cycloaddition, Mesoionic Heterocycles, S N 2" Reaction, o-Benzoquinones, o-Benzoquinone-diimines 5-(4-Methylphenyl)-2,7-diphenyl-4-phenylcarbamoylimidazolo[l,2-c]thiazol (9) reacts with tetrachloro-o-benzoquinone to give a [;r4-l-;r4]cycloadduct (17); in an obviously analogous man-ner 5-(4-methylphenyl)-2.7-diphenylimidazolo[l,2-c]thiazol (8) with N.N'-benzenesulfonyl-o-benzoquinonediimine (14) yields compound 16 and benzenesulfinic acid. The [.T4+.T4]adduct 17 solvolyzes with alcohols in a stereoselective S N 2" reaction giving 24a, b. The stereochemical out-come of this reaction has been determined by an X-ray analysis of 24a, 
  Reference    Z. Naturforsch. 43b, 347—360 (1988); eingegangen am 2. Oktober 1987 
  Published    1988 
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 Identifier    ZNB-1988-43b-0347 
 Volume    43 
63Author    Heinz Dürr, Klaus Zengerle, Hans-Peter TrierweilerRequires cookie*
 Title    Podanden, Coronanden und Kryptanden als neue Komplex-Liganden für Photoelektronentransfer-Reaktionen Synthese und erste photophysikalische Studien Podands, Coronands and Cryptands as New Complex-Ligands in Photoeleetron Transfer Reactions Synthesis and Photophysical Studies  
 Abstract    Podands, coronands and cryptands containing 2,2'-bipyridine-units were synthesized. These Compounds can be used as ligands in Ru(II)-polypyridinecomplexes. This new route principally allows the preparation of tris-heteroleptic complexes using the appropriate cryptands. Ru(II)-polypyridines RuL 3 2+ (e.g. Ru(bpy) 3 2+) are interesting as sensitizers in photochemical water cleavage. Compared to Ru(bpy) 3 2+ , the photoanationrate should be reduced in the Ru(cryp) 2+ complex. 
  Reference    Z. Naturforsch. 43b, 361—367 (1988); eingegangen am 14. September/3. November 1987 
  Published    1988 
  Keywords    Podands, Coronands, Cryptands, Photosensitizer, Photoanation 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-0361.pdf 
 Identifier    ZNB-1988-43b-0361 
 Volume    43 
64Author    Ekkehard Lindner, Berthold AndresRequires cookie*
 Title    Novel Basic Ligands for the Homogenous Catalytic Methanolcarbonyla- tion, XV [1] (Ether-Phosphane)-Stabilized c/s-Dihydrido-rhodium(III) Complex  
 Abstract    Reaction of [Rh(NBD)(P~0) 2 ][SbF 6 ] (1) (NBD = norbornadiene) with hydrogen results in the forma-tion of the stable dihydrido rhodium complex [c/s-H 2 Rh(PO) 2 ][SbF 6 ] (2). Rh-O bond cleavage in 2 by carbon monoxide or NaBH 4 affords the pro-ducts [/ram-(P~0) 2 Rh(C0) 3 ][SbF 6 ] (3) and [trans-H 2 Rh(P~0) 2 (?7 2 -H 2 BH 2)] (5), respectively. Upon treating a THF solution of 3 with argon, 3 eliminates CO to give the complex [(OC)Rh(PO)(P~0)][SbF 6 ] (4) with a mono-and bidentate (ether-phosphane) ligand. 
  Reference    Z. Naturforsch. 43b, 369—370 (1988); eingegangen am 30. Oktober 1987 
  Published    1988 
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 Identifier    ZNB-1988-43b-0369_n 
 Volume    43 
65Author    K. Bütje, W. PreetzRequires cookie*
 Title    Schwingungs-und Elektronenspektren der bindungsisomeren Hexakis(thiocyanato(N)-thiocyanato(S))-osmate(III) und (IV) Vibrational and Electronic Spectra of Bond-Isomeric Hexakis(thiocyanato(N)-thiocyanato(S))osmates(III) and (IV)  
 Abstract    Bond-Isomeric Hexakis(thiocyanato(N)-thiocyanato(S))osmates(III) and (IV), Geometrie Isomers, UVS Spectra, Raman Spectra, IR Spectra Well-resolved IR and Raman spectra of the two sets of all 10 isomeric complexes [OS(NCS)"(SCN) 6 _"] 3 ~ /2 ~, n — 0-6, have been recorded. For both series, v CS(N) > v CS(S) and <Ws > ^SCN; f° r the Os(III) complexes, v CN(N) ~ v CN(S) and v Qs N — ^oss while for the Os(IV) compounds, v CN(N) < v CN(S) and v 0S N ~ v o s s-The vibrational spectra of the n — 0 and n = 6 members of both sets are assigned according to D 3d and O h point symmetry, respectively. For the mixed linkage isomers the band pattern is strongly influenced by pseudo-octahedral coupling wherever frequencies of N-and S-bonded groups coincide. The metal-ligand stretching region is therefore assigned according rather to pseudo-O h , pseudo-D 3d and pseudo-D 4h symmetry than to D 4h , C 4V , C 3V and C 2V microsymmetry. The charge-transfer spectra of both series are similar, showing a parallel hypsochromic shift with increasing n value. Upon oxidation, a bathochromic shift of the CT bands by an average of 5400 cm" 1 is observed, and the intensity increases by a factor 2-2.5. Weak absorptions in the near infrared region are assigned to intraconfigurational transitions. 
  Reference    Z. Naturforsch. 43b, 371—381 (1988); eingegangen am 18. Dezember 1987 
  Published    1988 
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 Identifier    ZNB-1988-43b-0371 
 Volume    43 
66Author    K. Bütje, W. PreetzRequires cookie*
 Title    Darstellung  
 Abstract    und Redoxverhalten aller bindungsisomeren Hexakis(thiocyanato(N)-thiocyanato(S))-osmate(III) und (IV), [Os(NCS)"(SCN) 6 _ n ] 3 " 2 ", n = 0-6, einschließlich der Stereoisomeren Preparation and Electrochemical Behaviour of All Bond-Isomeric Hexakis(thiocyanato(N)-thiocyanato(S))osmates(III) and (IV), [OS(NCS)"(SCN)6_"] 3-/2 ~, n = 0-6, Including Stereoisomers Bond Isomeric Hexakis(thiocyanato(N)-thiocyanato(S))osmates(III) and (IV), Geometrie Isomers, Cyclic Voltammograms The first two complete series of all 10 possible linkage and geometric isomers of the general formula [Os(NCS)"(SCN) 6 _"] 3-/2_ have been obtained. The Os(III) complexes, some of which have been previously known, are prepared from the reactions of K : [OsX"], X = Cl, Br, I, and K 2 [OSO : (OH) 4 ] with excess aqueous or methanolic KSCN solution and subsequent chromato-graphic separation on DEAE cellulose. Oxidation with Ce(IV) in acetone or methanol yields the corresponding Os(IV) compounds without changes in the ligand sphere except for n = 0, but pure salts of [Os(SCN) 6 ] 2 " are isolated by repeated recrystallization. S-bonding is less favoured in Os(IV) than in Os(III), proving that Os(IV) is the harder Lewis acid. Cyclic voltammograms of all isomers show two waves, a mainly irreversible Os(II)/Os(III) couple and a reversible Os(III)/Os(IV) couple. Characteristic shifts of the half-wave potentials of both electron transfer reactions within the series give strong evidence of ;r-back donation to —NCS. 
  Reference    Z. Naturforsch. 43b, 382—388 (1988); eingegangen am 18. Dezember 1987 
  Published    1988 
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 Identifier    ZNB-1988-43b-0382 
 Volume    43 
67Author    Hans-U Hummel, Hermann MeskeRequires cookie*
 Title    Über Verbindungen subvalenter Hauptgruppenmetallkationen mit Dithiolaten, 1. Mitteilung. Das dimorphe Blei(II)-l,l-dicyanoethylen-2,2-dithiolat: Darstellung und Kristallstrukturen Compounds of Subvalent Main Group Metal Cations with Dithiolates, 1. Contribution. Dimorphie Lead(II) l,l-Dicyanoethylene-2,2-dithiolate: Preparation and Crystal Structures  
 Abstract    By reaction of Pb(CH,COO) 2 -3 H 2 0 with Na 2 S 2 C=C(CN) 2 -3 H 2 0 in water, a-PbS 2 C=C(CN) 2 is obtained. Hydrothermal conditions give small crystals of the a-and /3-phase. The crystal structures of the two phases have been determined. The a-phase is monoclinic with space group P2Jn and a = 11.879(5), b = 12.027(5), c = 4.655(1) Ä, ß = 96.94(3)°, Z = 4. The compound contains PbS 2 C 4 N 2 molecules with Pb—S = 2.66 and 2.90 Ä. Two molecules are connected to dimers with Pb-Pb = 4.44 Ä. The /3-phase also crystallizes monoclinically, space group C2/c, a = 9.613(1), b = 13.579(1), c -16.052(2) Ä, ß = 98.36°, and Z = 12. There are two independent lead positions, with the metals integrated in PbS 2 C = C(CN) 2 groups with a stereochemically active lone-pair, and dimers Pb 2 (S 2 C 4 N 2) 2 with Pb-Pb distance = 3.80 Ä. 
  Reference    Z. Naturforsch. 43b, 389—398 (1988); eingegangen am 21. Dezember 1987 
  Published    1988 
  Keywords    Lead(II) l, l-Dicyanoethylene-2, 2-dithiolate, a-and /3-Phase, Synthesis, Crystal Structure 
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 Identifier    ZNB-1988-43b-0389 
 Volume    43 
68Author    Rolf Minkwitz, Hans Preut, Jürgen SawatzkiRequires cookie*
 Title    Kristallstruktur von Triphenylmethyliodsulfan (C 6 H 5 ) 3 CSI [1] Crystal Structure of Triphenylmethyliodosulfane (C 6 H 5 ) 3 CSI [1]  
 Abstract    The crystal structure of (C 6 H 5) 3 CSI is reported. It is the first structure determination of an iodine sulfane. (C 6 H 5) 3 CSI crystallizes in the monoclinic space group P2,/c with a — 1226.4(7) pm, b = 1398.8(18) pm, c = 941.6(8) pm, ß = 96.38(8)° and Z = 4. The sulfur-iodine bond length is 240.6(4) pm corresponding to the sum of the covalent radii with 237 pm. The molecules are linked via short I---S contacts of 321.0(4) pm such that a zig-zag chain is formed. 
  Reference    Z. Naturforsch. 43b, 399—402 (1988); eingegangen am 9. Oktober 1987 
  Published    1988 
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 Identifier    ZNB-1988-43b-0399 
 Volume    43 
69Author    Cl, Br, Rolf Minkwitz, Arnulf WernerRequires cookie*
 Title    Methyl(trifluormethyl)haIogensulfonium-Salze [ 1 ] Halogen = F, CI, Br, I Methyl(trifluoromethyl)halosulfonium Salts [1]  
 Abstract    The preparation and spectroscopic characterization of the halosulfonium salts CH ,(CF,)SHal + A (Hal = F, Cl, Br, I, A" = AsF 6 ~~, SbF 6 ~, SbCl A ") is reported. The compounds are synthesized by the reaction of the sulfane CH,SCF, with XeF + MF h ~, Cl.F+AsFf,", Cl 2 /AsF 5 , Cl 2 /SbCl 5 , Br : /AsF 5 , or I 3 + MF 6 ~ (M = As, Sb), resp., at low temperatures. 
  Reference    Z. Naturforsch. 43b, 403—411 (1988); eingegangen am 10. Dezember 1987 
  Published    1988 
  Keywords    Preparation Raman Spectra, NMR Spectra, IR Spectra 
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 Identifier    ZNB-1988-43b-0403 
 Volume    43 
70Author    Schaffrath, R. GruehnRequires cookie*
 Title     
 Abstract    The compounds La : Ta0 4 Cl 3 and Ce : Ta0 4 Cl 3 have been prepared by reacting SEC1 3 with SETa0 4 (SE = La, Ce) in evacuated silica ampoules. Single crystals of La 2 Ta0 4 Cl 3 were obtained by chemical transport reaction (1 lOO^lOOO °C) using chlorine as transport agent. The crystal structure of La^Ta0 4 Cl 3 has been refined with single crystal data (Pmmn; a — 15.528(1) Ä. b = 3.9395(2) Ä, c = 18.132(2) Ä; Z = 6; R = 8.53%, R w = 6.10%). Main building units are TaO ? trigonal bipyramides and two-or threefold capped trigonal prisms around La. 
  Reference    Z. Naturforsch. 43b, 412—418 (1988); eingegangen am 23. November 1987 
  Published    1988 
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 Identifier    ZNB-1988-43b-0412 
 Volume    43 
71Author    H. Bock, P. RittmeyerRequires cookie*
 Title    ESR-Nachweis von Tetra(methylthio)thiophen-und Tetra(methylthio)ethen- Radikalkationen bei der oxidativen Schwefelung von H 3 CS-C=C-SCH 3 mit S 2 C1 2 /A1C1 3 und H 3 CSC1/A1C1 3 Radical Ions, 79 [1, 2] ESR Evidence for Tetra(methylthio)thiophene and Tetra(methylthio)ethene Radical Cations During the Oxidative Sulfuration of H 3 CS-C=C-SCH 3 by S 2 CL/A1C1 3 and H 3 CSC1/A1C1 3  
 Abstract    Radical Ions, ESR Spectra, Tetra(methylthio)thiophene Di(methylthio)acetylene H 3 CS-C=C-SCH 3 reacts with S : C1 2 in A1C1 3 /H 2 CC1 2 solution to the tetra(thiomethyl)thiophene radical cation (H 3 CS) 4 C 4 S® and with H,CSC1 to the tetra(thio-methyl)ethene radical cation (H 3 CS) 2 C'^C(SCH 3) 3 . Their ESR spectra are assigned by compari-son with literature data or those of analogous products obtained from other acetylene derivatives R—C=C —R with R = SCH 2 CH 3 , CH,, QH 5 as well as based on HMO arguments. The possible course of the oxidative sulfuration is discussed. 
  Reference    Z. Naturforsch. 43b, 419—426 (1988); eingegangen am 16. November 1987 
  Published    1988 
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 Identifier    ZNB-1988-43b-0419 
 Volume    43 
72Author    Joseph Grobe, Jürgen SzameitatRequires cookie*
 Title    Reaktive E=C(p-p)^-Systeme, XVI [1]  
 Abstract    Trimethylstannylphosphane des Typs Me 3 SnP(R)CF 3 (R = Me, Et) als Phosphaalken-Vorstufen Reactive E=C(p-p);r-Systeme, XVI [1] Trimethylstannylphosphanes of the Type Me 3 SnP(R)CF 3 (R = Me, Et) as Phosphaalkene Precursors Preparation and Thermolysis of Me,SnP(R)CF,. Cycloaddition to Dienes, Phosphane Sulfides Stannylphosphanes of the type Me,SnP(R)CF, [R = Me (1), Et (2)] have been prepared by a multistep synthesis (Fig. 1) starting either with F,CPI 2 or with P(NEt 2),. Due to the alkyl sub-stituents, 1 and 2 show a higher thermal stability than the analogous perfluoroalkyl compounds Me,SnP(R F) 2 (R F = CF,, C 2 F 5). Pyrolysis of 1 and 2 at 380 °C/10" 3 Torr gives the new phospha-alkenes RP=CF : (R = Me, Et) as reactive intermediates collected at —196 °C. They polymerize on the attempt to prepare diluted solutions even at very low temperatures. In case of the ethyl derivative the product (EtPCF 2) v is a colourless polymer which on heating (500—600 °C) yields a mixture of dimers (EtPCF 2) 2 (trans-, eis-1,3-and trans-\,2-diphosphetane; ratio 73:13,5:13,5). 1 and 2 have been used as equivalents of the phosphaalkenes RP=CF 2 in one-pot reactions with 2,3-dimethylbutadiene and 1,3-cyclohexadiene, respectively. The labile P=C intermediates pro-duced at 120 °C are captured by the dienes affording the [2+4]-cycloadducts 3—6 in good yields. Oxidation with sulfur gives the corresponding phosphane sulfides 7—10 in almost quantitative yields. New compounds were characterized by spectroscopic (NMR. MS, IR) and analytical methods. Trimethylstannylphosphane des Typs Me 3 SnP(R F) 2 
  Reference    Z. Naturforsch. 43b, 427 (1988); eingegangen am 28. September/16. November 1987 
  Published    1988 
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 Identifier    ZNB-1988-43b-0427 
 Volume    43 
73Author    HelmutG. Alt, HeidiE. Engelhardt, Abbas Razavi, MarvinD. Rausch, RobinD. RogersRequires cookie*
 Title    Pentamethylcyclopentadienyl-, Acetylcyclopentadienyl- und Indenyl-dicarbonyl-AcetylenkompIexe des Vanadiums. Molekülstruktur von C 9 H 7 V(CO) 2 PhC 2 H Pentamethylcyclopentadienyl, Acetylcyclopentadienyl and Indenyl Dicarbonyl Acetylene Complexes of Vanadium. Molecular Structure of C 9 H 7 V(CO) 2 PhC 2 H  
 Abstract    The photo-induced reaction of C,Me s V(CO) 4 (1), (C s H 4 COMe)V(CO) 4 (2) and C,H 7 V(CO) 4 (3) with acetylenes R'C.R 2 (R 1 , R 2 = H, Me, Ph) yields the substitution products CsMesV(CO).R'C,R 2 (4), (C 5 H 4 COMe)V(CO) 2 R'C 2 R 2 (6) and C v H 7 V(CO) 2 R'C 2 R 2 (7). One CO ligand of complexes 4 can be substituted by PMe, affording complexes of the type C 5 Me s V(CO)(PMe 3)R'C 2 R 2 (5). The acetylene complexes 4—7 are characterized by their IR, 'H, 13 C and 5I V NMR as well as their mass spectra. In these compounds the alkyne ligand shows a hindered rotation around the metal alkyne bond axis. The rotation barrier (zIG* = 40—50 kJ/mol) is higher than in the corresponding cyclopentadienyl complexes. An X-ray crystal structure analysis of C 9 H 7 V(CO) 2 PhC 2 H indicates an orientation of the alkyne-C —C-axis in the symmetry plane of the C 9 H 7 V(CO) 2 fragment. The phenyl substituent is pointing away from the metal and the indenyl ligand. 
  Reference    Z. Naturforsch. 43b, 438—444 (1988); eingegangen am 3. August 1987 
  Published    1988 
  Keywords    Acetylene Complexes, 5I V NMR Spectra, 'H NMR Spectra, l3 C NMR Spectra 
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 Identifier    ZNB-1988-43b-0438 
 Volume    43 
74Author    Franz Gingl, Joachim SträhleRequires cookie*
 Title    Synthese und Struktur von Trichloro(phthalocyaninato)tantal(V) Synthesis and Structure of Trichloro(phthalocyaninato)tantalum(V)  
 Abstract    Synthesis, Crystal Structure, Trichloro(phthalocyaninato)tantalum(V) The reaction of TaCl, with phthalodinitrile at 240 °C yields TaCl 3 (pc). It crystallizes in the triclinic space group PI with the lattice constants a = 836.0(2), b = 1207.7(4), c = 1368.8(4) pm, a = 79.86(3)°, ß = 93.34(2)°, y = 100.97(2)°, Z = 2. The structure is closely related to that of triclinic TiCl 2 (pc). In TaCl 3 (pc) the Ta atom has the coordination number seven. The plane of the three Cl atoms is parallel to the plane of the phthalocyaninato ligand forming a coordination polyhedron of the type square base — trigonal cap with the symmetry C s . The distances Ta —Cl range from 237.4 to 246.6 pm and the distances Ta-N from 216.7 to 218.8 pm. 
  Reference    Z. Naturforsch. 43b, 445—448 (1988); eingegangen am 26. November 1987 
  Published    1988 
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 Identifier    ZNB-1988-43b-0445 
 Volume    43 
75Author    Bernhard Glaser, ErwinP. Mayer, Heinrich Nöth, Wilfried Rattay, Ulrich WietelmannRequires cookie*
 Title    Beiträge zur Chemie des Bors, 190 [1] Synthese und Molekülstruktur von 1,2-Dihydroboreten und Azadiboretidinen Contribution to the Chemistry of Boron, 190 [1] Synthesis and Molecular Structure of 1,2-Dihydrodiboretes and Azadiboretidines  
 Abstract    [2+2]-Cycloadditions of 9-Fluorenylidentetramethylpiperidinoboranes have been studied with selected olefines, acetylenes and iminoboranes. No reactions with olefines were observed. While propiolic methylester reacts exclusively at the carbonyl bond producing the oxaboretane 5, alkines such as diethylamino-alkines, cyclo-octine and phenylacetylene provide access to the'1,2-dihy-droboretenes 6, 3 and 2. Tetramethylpiperidinoiminoboranes make 1.2.4-azadiboretidines 7 available. 6a and 7a contain a folded four-membered ring as shown by X-ray structure analysis. There is only a weak 1,3-intraannular interaction due to BN-;r-bonding of the boron atoms with their exocyclic amino group. 
  Reference    Z. Naturforsch. 43b, 449—456 (1988); eingegangen am 10. Dezember 1987 
  Published    1988 
  Keywords    Reactivity of Aminomethyleneboranes, Transannular Interaction, X-Ray, 1, 2-Dihydroboret Derivatives, 1, 24-Azadiboretidine Derivatives 
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 Identifier    ZNB-1988-43b-0449 
 Volume    43 
76Author    Siegfried Pohl, Wolfgang SaakRequires cookie*
 Title    Zur strukturellen Verzerrung von Fe 4 S 4 I 4 2 -Clustern durch Iod-Iod-Kontakte: Die Kristallstrukturen von (Ph 4 P)2Fe 4 S4l4 und (Me 3 NCH 2 Ph) 2 Fe 4 S 4 I 4 Structural Distortion of Fe 4 S 4 I 2 2_ Clusters through Iodine-Iodine Contacts: Crystal Structures of (Ph 4 P) 2 Fe 4 S 4 I 4 and (Me 3 NCH 2 Ph) 2 Fe 4 S 4 I 4  
 Abstract    The structures of (Ph 4 P) 2 Fe 4 S 4 I 4 (1) and (Me 3 NCH 2 Ph) 2 Fe 4 S 4 I 4 (2) were determined from single crystal X-ray diffraction data. 1 crystallizes in the tetragonal space group 14,/o with a = 1088.3(1) and c = 4540.3(2) pm. Z -4. 2: Monoclinic, space group Cc. a = 1332.0(2), b = 1513.8(3), c = 1755.1(3) pm./? = 96.69(1)°, Z = 4. In 1 the anion Fe 4 S 4 I 4 2 
  Reference    Z. Naturforsch. 43b, 457—462 (1988); eingegangen am 20. November 1987 
  Published    1988 
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 Identifier    ZNB-1988-43b-0457 
 Volume    43 
77Author    Gerhard Cordier, Michael SteherRequires cookie*
 Title      
 Abstract    The compound Sr 5 Al 2 Sb 6 crystallizes in the orthorhombic system (space group Pnma (No. 62)) with the lattice constants: a = 1212.4(4) pm, b = 1034.1(4) pm, c = 1340.9(5) pm. AlSb 4 tetrahedra are connected via common edges and corners to chains. Every second terminal Sb atom of the chain is connected to another Sb atom, such that end-on Sb 2 groups and terminal Sb alternate. The compound Ba 5 In 2 Sb 6 crystallizes in the orthorhombic system (space group Pbam (No. 55)). The lattice constants are: a = 1530.7(6) pm, b = 1335.8(5) pm, c = 478.6(2) pm. In the structure, InSb 4 tetrahedra are connected via common corners and Sb 2 groups to form double chains. Both compounds are classified as Zintl phases. 
  Reference    Z. Naturforsch. 43b, 463—466 (1988); eingegangen am 10. Dezember 1987 
  Published    1988 
  Keywords    Strontium Antimonido Aluminates, Barium Antimonido Indates, Crystal Structure, Zintl Phase 
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 Identifier    ZNB-1988-43b-0463 
 Volume    43 
78Author    Ulf Thewalt, Konrad HollRequires cookie*
 Title    Metall-Komplexe mit S 4 N 4 -Liganden: Die Strukturen von zwei Komplexen der Zusammensetzung [TiCl 4 (S 4 N 4 )] 2 Metal Complexes with S 4 N 4 Ligands: The Structures of Two Complexes of Composition [TiCl 4 (S 4 N 4 )] 2  
 Abstract    of TiCl 4 with S 4 N 4 in CH 2 C1 2 /CC1 4 produces a mixture of two crystalline dinuclear complexes of composition [TiCl 4 (S 4 N 4)L. Crystal data for the orange-yellow a-isomer: mono-clinic, space group P2 x /n with a = 11.608(3) A, b = 8.304(3) Ä, c = 10.938(5) A. ß = 101.06(4)° and Z = 2. Crystal data for the red-brown /J-isomer: monoclinic, space group P2,/c with a = 11.220(2) Ä, b = 13.868(2) Ä, c -14.839(4) k, ß = 106.18(2)° and Z = 4. Crystal structure analyses reveal that the S 4 N 4 molecules in the a-form act as 1.3-N.N'-bonded bridging ligands and in the /S-form as N-bonded monodentate ligands. 
  Reference    Z. Naturforsch. 43b, 467—471 (1988); eingegangen am 25. November 1987 
  Published    1988 
  Keywords    Tetrasulfurtetranitride, Titanium Complexes, Dinuclear Complexes Slow reaction 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-0467.pdf 
 Identifier    ZNB-1988-43b-0467 
 Volume    43 
79Author    Yuzo Nishida, Naoko Oshino, Tadashi TokiiRequires cookie*
 Title    Crystal Structure and Magnetic Property of the Binuclear Manganese(III) Complex with /u-Acetate and Di-ji-Alkoxo Bridges  
 Abstract    Binuclear manganese(III) complex, [Mn : L(u-OCH 3)0<-CH 3 COO)(OHCH : ,)]ClO 4 was pre-pared and characterized in terms of crystal structure determination, magnetic measurement, and ESR spectroscopy, where H 3 L represents the Schiff base derived from salicylaldehvde and 1,5-diamino-3-pentanol. 
  Reference    Z. Naturforsch. 43b, 472—474 (1988); received November 9/December 17 1987 
  Published    1988 
  Keywords    Binuclear Manganese(III) Complex, Crystal Structure, ESR Spectra, Magnetic Property 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-0472.pdf 
 Identifier    ZNB-1988-43b-0472 
 Volume    43 
80Author    Rupert Bauer, Peter Nussbaumer, Michael Neumann-SpallartRequires cookie*
 Title    On the Synthesis and Electrochemical Properties of Some New Bipyridinium and Related Compounds  
 Abstract    The synthesis of some new bipyridinium salts is described. Their behavior upon reduction is studied by cyclovoltammetry, coulometry and spectroscopically. Halfwave potentials range from —0.28 V to —0.59 V and e values of the reduced viologens lie around 10 4 MT'cm -1 . In addition two relay compounds (4,4'-pyridine-2,4-diyl)-bis-(l-methylpyridinium methylsulfate), 4.4',4"-(pyridine-2,4,6-triyl)-tris-(l-methylpyridiniumchloride) that are not viologens are described. These substances also form a colored radical upon reduction, but with exceptional stability to-wards oxidation with dioxygen. From coulometric measurements it is inferred that three electrons are transferred in one step. Spectral changes observed in the course of the electrochemical reduction are explained by dimer formation. 
  Reference    Z. Naturforsch. 43b, 475—482 (1988); received February 13/October 22 1987 
  Published    1988 
  Keywords    Electron Transfer Relays, Viologen Derivatives, Bipyridinium Compounds, Stable Cation Radicals, Photoinduced Water Splitting 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-0475.pdf 
 Identifier    ZNB-1988-43b-0475 
 Volume    43 
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