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1980 (345)
141Author    G. C. Papavassiliou, D. LayekRequires cookie*
 Title    Electronic and Resonance Raman Spectra of Some New Mixed-Valence Compounds of Pt and Pd with a Metal-Halide Chain  
 Abstract    The electronic and resonance Raman spectra of new mixed-valence compounds of the type M2'[M(L)X3][M(L)X5], where M' = K, NH4, M -Pt or Pd, L = NH3 or pyridine, and X = Cl, Br or I, have been studied. The single-crystal polarized reflectance spectra indicate the one-dimensional semiconductor behaviour. The polarized resonance Raman spectra confirm the —M(II)—X-M(IV)-X linear chain structure, which is in accordance with the X-ray results. The polarization of M-N bands can be explained by the Snyder's theory (1971). 
  Reference    Z. Naturforsch. 35b, 676—679 (1980); received January 14 1980 
  Published    1980 
  Keywords    Electronic Spectra, Raman Spectra, Mixed-Valence, Oriented Molecules 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0676.pdf 
 Identifier    ZNB-1980-35b-0676 
 Volume    35 
142Author    WolfgangA. Herrmann, Johann Plank, Ivan Bernal, Michael CreswickRequires cookie*
 Title    Übergangsmetall-Methylen-Komplexe, X [1] Methylen-und Alkyl-Eisen-Komplexe aus Diazoalkanen. Molekülstruktur von //-Carbonyl-//-feri-butoxycarbonyl-methylen- bis [carbonyl(^ 5 -cyclopentadienyl)eisen] (Fe-Fe) Transition Metal Methylene Complexes, X [1J Methylene and Alkyl Iron Complexes from Diazoalkanes. Molecular Structure of //-Carbonyl-^-Jerf-butoxycarbonyl-methylene- bis[carbonyl(if-cyclopentadienyl)iron] (Fe-Fe)  
 Abstract    The novel doubly bridged /i-methylene iron complexes /M-[C(H)C02R]-^-C0[(??5.C5H5)Fe(C0)]2 (R = C2H5: 3a; R — ^Hg: 3b) have been syn-thesized by low-temperature photolysis of the corresponding alkyldiazoacetates 2 a and 2 b, resp., in the presence of [(r? 5 -CsH5)Fe(CO)2]2 (1) and characterized by means of their analytical data and IR, X H NMR and mass spectroscopy. The geometry of 3 b has been established by single crystal X-ray diffraction techniques. cr-Alkyl iron complexes of the type (^ 5 -C5H5)Fe(C0)2[CHRR'] are accessible from the corresponding diazoalkanes N2 = CRR'. 
  Reference    Z. Naturforsch. 35b, 680—688 (1980); eingegangen am 3. Dezember 1979 
  Published    1980 
  Keywords    ^-Alkoxycarbonylmethylene, cr-Alkyl, Bridging Ligands, Carbonyl Complexes, Iron 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0680.pdf 
 Identifier    ZNB-1980-35b-0680 
 Volume    35 
143Author    Helmut Werner, Rainer FeserRequires cookie*
 Title    Synthese und Reaktivität von rj 5 -Indenyl-trimethylphosphanrhodium(I) - und -rhocüum(HI)-Komplexen [1] Synthesis and Reactivity of rf -Indenyl-trimethylphosphanerhodium (I) and -rhodium(III) Complexes [1]  
 Abstract    Indenylbis(trimethylphosphane)rhodium(I), Synthesis, Reactivity, Indenylhydridobis(trimethylphosphane)rhodium(III) Cation, Lewis Bases The Compounds [(PMe3)2RhCl]2 and [Rh(PMe3)4]Cl react with indenyllithium to give C9H7Rh(PMe3)o. The strong Lewis basicity of this complex is demonstrated by its reactions with NH4PF6, Mel and MeCOCl which lead to the cations [C9H7RhR(PMe3)2] + (R = H, Me, COMe). The hydrido complex [C9H7RhH(PMe3)2]PF6 reacts with 1,5-C8Hi2, CO and PMe3 by complete displacement of indene to give [Rh(PMe3)2(C8Hi2)]PF6, [Rh(PMe3)2(CO)3]PF6 and [Rh(PMe3)4]PF6. Reaction of [C9H7RhH(PMe3)2]PF6 with C2H4 yields an equilibrium mixture containing the cationic tris(ethylene) complex [Rh(PMe3)2(C2H4)3] + . 
  Reference    Z. Naturforsch. 35b, 689—693 (1980); eingegangen am 19. Februar 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0689.pdf 
 Identifier    ZNB-1980-35b-0689 
 Volume    35 
144Author    Joseph Grobe, Due Le VanRequires cookie*
 Title    Perfluormethyl-Element-Liganden, XXIII [1]  
 Abstract    Darstellung und spektroskopische Untersuchung von Mo(CO)5L-Komplexen (L = R2EER2 , R2EE R; R, R -CH3, CF3; E = P, As; E = S, Se, Te) Perfluoromethyl Element Ligands, XXIII [1] Preparation and Spectroscopic Investigation of Mo(C0)5L Complexes (L = R2EER2', RsEE'R; R, R' = CH3, CF3; E = P, As; E' = S, Se, Te) Trifluormethyl Element Compounds, Organoelement Compounds of Main Groups V and VI, Pentacarbonylmolybdenum Derivatives Mo(CO)5L complexes (L = R2EER2', R2EE'R; R, R' = CH3 and/or CF3; E = P, As; E' = S, Se, Te) have been prepared by reaction of Mo(CO)5THF with L at room tem-perature. The new compounds were characterized by analytical and spectroscopic (IR, NMR, MS) methods. 
  Reference    Z. Naturforsch. 35b, 694—699 (1980); eingegangen am 11. Januar 1980 
  Published    1980 
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 Identifier    ZNB-1980-35b-0694 
 Volume    35 
145Author    Wolf-Walther Du Mont, Heinz-Jürgen KrothRequires cookie*
 Title    19 Sn-NMR-Ver8chiebungen und Koordinationsverschiebungen von Halogenstannylenkomplexen U9 Sn-NMR Shifts and Coordination Shifts of Halogenostannylene Complexes  
 Abstract    Halogenostannylene Complexes, 119 Sn NMR Coordination Shifts 119 Sn NMR data of a number of base-stabilized stannylenes L (L = R3P-SnCl2, (THF)zSnCl2, (THF^SnBr^ are compared with those of the corresponding tin ylid complexes M(CO)sL (M = Cr, W). 119 Sn NMR coordination shifts are strongly dependent on the transition metal. Increasing the number of base ligands attached to transition metal-coordinated tin(II) leads to significant upfield shifts and to increasing coupling constants W 19 Sn^W). 
  Reference    Z. Naturforsch. 35b, 700—702 (1980); eingegangen am 13. Februar 1980 
  Published    1980 
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 Identifier    ZNB-1980-35b-0700 
 Volume    35 
146Author    Martin Pfisterer, Günter NagorsenRequires cookie*
 Title    Zur Struktur ternärer Übergangsmetallarsenide On the Structure of Ternary Arsenides  
 Abstract    New ternary arsenides ET2AS2 (E = Ca, Sr, Ba; T = Cr, Fe, Co, Ni, Cu) were prepared. The cell data were determined by X-ray powder methods. All these compounds crystallize in the tetragonal ThCr2Si2 structure (I4/mmm), which consists of layers of edge-shared TAS4 tetrahedra. The alkaline-earth atoms are intercalated between the layers. 
  Reference    Z. Naturforsch. 35b, 703—704 (1980); eingegangen am 28. Januar 1980 
  Published    1980 
  Keywords    Intermetallic Compounds, Crystal Data, Ternary Arsenides 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0703.pdf 
 Identifier    ZNB-1980-35b-0703 
 Volume    35 
147Author    Dimitrios Jannakoudakis, Elli TheodoridouRequires cookie*
 Title    Über den Einfluß des pH-Wertes auf die polarographische Reduktion der Nitrophenole mit und ohne Zusatz von Campher On the Influence of the pH Value on the Polarographic Reduction of the Nitrophenols in Presence and Absence of Campher  
 Abstract    The Polarographie behavior of the nitrophenols in the pH range 1-13 and the in-fluence of campher on the polarographic curves are studied. The pH dependence of the half wave potentials and the different reduction of the depolarizers in their molecular or anionic form are discussed. 
  Reference    Z. Naturforsch. 35b, 705—708 (1980); eingegangen am 8. Februar 1980 
  Published    1980 
  Keywords    Nitrophenols, Polarography, Half Wave Potential, Inhibitor 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0705.pdf 
 Identifier    ZNB-1980-35b-0705 
 Volume    35 
148Author    A. Georgiades, G. Schilling, H. P. LatschaRequires cookie*
 Title    Reaktion von Bismuttrichlorid mit N,N'-Bis(trimethylsilyl)-harnstoff und Aceton Reaction of BiCL with N,N'-Bis(trimethylsilyl)urea and Acetone  
 Abstract    4,4,10,10 -Tetramethy lspiro [5,5]-l,3,7,9 -tetrazaundecadion -2,8-Bismuthtrichloride 
  Reference    Z. Naturforsch. 35b, 709—711 (1980); eingegangen am 18. Januar 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0709.pdf 
 Identifier    ZNB-1980-35b-0709 
 Volume    35 
149Author    IbrahimI. Abd, El Gawad, Abd El-Hammid, Mohamad Harhash+, M. M. Abou El-ZahabRequires cookie*
 Title    Reinvestigation of the Behaviour of Benzal-anils towards the Action of Potassium Cyanide  
  Reference    Z. Naturforsch. 35b, 712—714 (1980); received January 7 1980 
  Published    1980 
  Keywords    Benzal-anils, Addition Reaction, 4-Imidazolidinone, Ring Closure 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0712.pdf 
 Identifier    ZNB-1980-35b-0712 
 Volume    35 
150Author    Emmanuel Chukwuemeka OkaforRequires cookie*
 Title    The Metal Chelates of Heterocyclic /3-Diketones and their Derivatives, Part IV New Mixed Ligand Tetrakis Complexes of Lanthanides Derived from tris-Acetylacetonates and Some 4-Acyl Pyrazolones  
 Abstract    Some new mixed ligand tetrakis chelates derived from tris acetylacetonates of La, Ce, Pr, Nd, and Gd -with other /?-diketones, like l-phenyl-3-methyl-4-benzoyl-pyrazolone-5 and l-phenyl-3-methyl-4-acetyl-pyrazolone-5 have been synthesised. The compounds are characterised by elemental analyses and IR data. The UV spectral properties and the conductance in DMF have also been reported. 
  Reference    Z. Naturforsch. 35b, 715—718 (1980); received January 2 1980 
  Published    1980 
  Keywords    Lanthanon Mixed Ligand Tetrakis Chelates, Synthesis, UV Spectra, IR Spectra 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0715.pdf 
 Identifier    ZNB-1980-35b-0715 
 Volume    35 
151Author    R. Battaglia, H. Kisch, C. Krüger, L.-K LmRequires cookie*
 Title    Übergangsmetallkomplexe von Diazenen, XV [1] Darstellung und Eigenschaften von Heterodimetallkomplexen des Typs LMM-(C£S-RN=NR)-M'LOT Transition Metal Complexes of Diazenes, XV [1] Synthesis and Properties of Heterodimetal Complexes LnM-(ci<s-RN=NR)-M'Lm  
 Abstract    of type LnM(^ 2 -pentamethylenediazirine)M'L»», LnM/M'Lwj = (CO)5Cr/Mo(CO)5, (CO)5Cr/Fe(CO)4, (CO)5W/Fe(CO)4 and (CO)5Cr/Mn(CO)2 5 J?(-MeC5H4) were prepared from [M'Lm(THF)] or Fe2(CO)9 and (j? 1 -pentamethylenediazirine)MLn. The structure of the Cr/Mo complex was determined by X-ray analysis. The IR and UV-VIS data resemble those of the corresponding homodi-metal complexes. 
  Reference    Z. Naturforsch. 35b, 719—723 (1980); eingegangen am 7. Februar 1980 
  Published    1980 
  Keywords    Diazene Complexes, Preparation, Structure Complexes 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0719.pdf 
 Identifier    ZNB-1980-35b-0719 
 Volume    35 
152Author    Hans-Dietrich Stachel, Hermann Poschenrieder, Hans BurghardRequires cookie*
 Title    Reduktone von Tetram-, Tetron-und Thiotetronsäuren Reductones of Tetramic, Tetronic and Thiotetronic Acids  
 Abstract    Spiro-oxiranes, Retro-aldol Cleavage, Reductones The 3-spiro-3',3'-dimethyl-2'-oxiranes of 5-benzylidene-2,4-dioxo-pyrrolidone, 5-benzyl-idene-2,4-dioxotetrahydrofuranone and 5-benzylidene-2,4-dioxotetrahydrothiophene yield the corresponding heterocyclic reductones (3 a-c) upon treatment with sulfuric acid. The tetramic acid reducton 3 a can also be obtained by hydrolysis of the diazoniumsalt 5. 
  Reference    Z. Naturforsch. 35b, 724—726 (1980); eingegangen am 19. Dezember 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0724.pdf 
 Identifier    ZNB-1980-35b-0724 
 Volume    35 
153Author    Oemer Saygin, Peter DeckerRequires cookie*
 Title    Nonenzymatic Catalysis by Metal Ions and Phosphoric Acid Esters of Hydroxamic Acid Formation*  
 Abstract    Nonenzymatic catalysis by bivalent ions of Be, Mg, Ca, Zn, Mn, Ni and Co and bio-organic phosphates of the formation of hydroxamic acids from acetate or amino acids has been studied systematically. Increased yields of hydroxamate were observed at particular combinations of reactants. The most prominent increase (ca. 15-fold) was found with acetate and Ni++, and with a combination of ATP and Be++. Among others especially ribose-5-phosphate and glucose-5-phosphate enhanced yields in the presence of most metal ions. Since no release of inorganic phosphate was observed, this effect cannot be interpreted as an evidence for intermediate transhosphorylation reactions; it may also result from simple catalytic effects of metal sugar complexes. 
  Reference    Z. Naturforsch. 35b, 727—730 (1980); received February 7 1980 
  Published    1980 
  Keywords    Prebiological Evolution, Bioids, Transphosphorylation, Hydroxylamine, Acylate Activation 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0727.pdf 
 Identifier    ZNB-1980-35b-0727 
 Volume    35 
154Author    Norio Miyoshi, Giiti TomitaRequires cookie*
 Title    Singlet Oxygen Production Photosensitized by Fluorescein in Reversed Micellar Solutions  
 Abstract    The quantum yield of singlet oxygen production was investigated in dodecylammonium propionate reversed micellar solutions containing 1,3-diphenylisobenzofuran and fluo-rescein as photosensitizer. The quantum yield was highly enhanced by the binding of fluorescein to reversed micelles, and increased with decreasing the solubilized water content in reversed micelles. Results obtained was discussed with the optical properties of fluorescein (absorption, fluorescence and phosphorescence) in reversed micellar solutions. 
  Reference    Z. Naturforsch. 35b, 731—735 (1980); received December 7 1979 
  Published    1980 
  Keywords    Singlet Oxygen, Fluorescein, Diphenylisobenzofuran, Water Content, Reversed Micelles 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0731.pdf 
 Identifier    ZNB-1980-35b-0731 
 Volume    35 
155Author    Norio Miyoshi, Giiti TomitaRequires cookie*
 Title    Buffer Action of Reversed Micelles  
 Abstract    The optical properties (absorption and fluorescence) of fluorescein sodium were investi-gated with changing the bulk pH value in aqueous, water-methanol mixed and dodecyl-ammonium propionate reversed micellar solutions. A strong buffer action was found in the reversed micellar solutions. The pKa values for the equilibrium between fluorescein mono-and di-anions in the ground and excited singlet states highly decreased in the reversed micellar solutions compared with those in non-micellar solutions. The micellar buffer action strongly affected the initial rate of the 1,3-diphenylisobenzofuran oxidation caused by the photosensitization of fluorescein. The buffer action was closely related to the solubilized water content. 
  Reference    Z. Naturforsch. 35b, 736—740 (1980); received January 9 1980 
  Published    1980 
  Keywords    Fluorescein, Reversed Micelles, Buffer Action, Solubilized Water 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0736.pdf 
 Identifier    ZNB-1980-35b-0736 
 Volume    35 
156Author    Norio Miyoshi, Giiti TomitaRequires cookie*
 Title    Solubilization of Methylene Blue in Reversed Micelles, Effect of Water  
 Abstract    The solubilization of methylene blue in dodecylammonium propionate reversed micelles in cyclohexane depended strongly on the solubilized water content. Methylene blue solubilized in the micelle of which head groups are not completely hydrated by bound water exhibited the new absorption bands at 495 and 270 nm, but these bands did not appear in the micelle containing free water. This dye had the absorption bands at 655 and 290 nm in the latter micelle. The solubilizing process and solubilized state of methylene blue in the reversed micelles were discussed with results obtained. 
  Reference    Z. Naturforsch. 35b, 741—745 (1980); received February 20 1980 
  Published    1980 
  Keywords    Methylene Blue, Reversed Micelles, Water Content, Solubilization 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0741.pdf 
 Identifier    ZNB-1980-35b-0741 
 Volume    35 
157Author    M. Murugesan, K. Ramasamy, P. ShanmugamRequires cookie*
 Title    Pyrroloquinolines, Part III [1] Synthesis of lH-Pyrrolo(2,3-b)quinolines  
 Abstract    2 -Chloro -3 -vinyl quinolines, 2 -Amino -3 -vinyl quinolines, 2 -Acetamido -3 -viny lquinolines, 2-Chloro-3-(r,2'-dibroethyl)quinolines, 1 H-Pyrrolo(2,3-b)quinolines A new route to synthesis of pyrrolo(2,3-b)quinolines is described based on the use of 2-chloro-3-vinylquinolines as well as 2-chloro-3-(l',2'-dibromoethyl)quinolines. 
  Reference    Z. Naturforsch. 35b, 746—748 (1980); received June 25 1979 
  Published    1980 
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 Identifier    ZNB-1980-35b-0746 
 Volume    35 
158Author    K. Burger, S. Penninger, S. TremmelRequires cookie*
 Title    Synthese yon 2.2-Dihydro-1.4.2-diazaphosphol-4-enen [1] Synthesis of 2,2-Dihydro-l,4,2-diazaphosphol-4-enes  
 Abstract    ,4-Bis(trifluoromethyl)-l,3-diazabuta-l,3-dienes below 0 °C react with P(III) com-pounds to give 2,2-dihydro-l,4,2-diazaphosphol-4-enes. IR, X H, 19 F, 31 P NMR, and mass spectra data of the new heterocyclic compounds are discussed. 
  Reference    Z. Naturforsch. 35b, 749—753 (1980); eingegangen am 17. Januar 1980 
  Published    1980 
  Keywords    [4+l]-Cycloaddition Reactions, l, 3-Diazabuta-l, 3-dienes, Phosphorus Compounds, Pentacoordination 4 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0749.pdf 
 Identifier    ZNB-1980-35b-0749 
 Volume    35 
159Author    DavidW. Allen, Helen WardRequires cookie*
 Title    The Chemistry of Heteroarylphosphorus Compounds, Part 14 [1] Effects of Heteroaryl Substituents at Phosphorus on the Steric Course of Wittig Reactions of Semistabilised and Stabilised Ylides  
 Abstract    Alkene cis-trans Ratio, Betaine Mechanism, Cycloaddition Mechanism The cis-trans ratio of the stilbenes formed in Wittig reactions of semistabilised ylides (derived from benzyltri(hetero)arylphosphonium salts in ethanolic ethoxide) with benz-aldehyde decreases markedly in the series 2-furyl >2-thienyl >phenyl > 1-methylpyrrol-2-yl. The 2-furyl group favours a greater proportion of the ci«-isomer than m-trifiuoro-methylphenyl, whereas the l-methylpyrrol-2-yl group favours a greater proportion of the trans isomer than jo-methoxyphenyl. Similarly, in Wittig reactions of carbonyl-stabilised ylides with benzaldehyde and acetaldehyde, the presence at phosphorus of 2-furyl groups results in a significant increase in the proportion of the cis-alkene compared to that formed from the related triphenylphosphonium ylide. These results are discussed in terms of both betaine and cycloaddition mechanisms for the Wittig reaction. Also discussed is their relevance to recent proposals concerning the elimination of alkene from the intermediate oxaphosphetan. 
  Reference    Z. Naturforsch. 35b, 754—757 (1980); received February 1 1980 
  Published    1980 
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 Identifier    ZNB-1980-35b-0754 
 Volume    35 
160Author    Nicholas Bodor, JamesJ. Kaminski, S. D. Worley, StevenH. Gerson, N. J.Requires cookie*
 Title    Quantitative Evaluation of the Reactivity of Alkylating Agents  
 Abstract    A sensitive and reproducible method for quantitative evaluation of the relative reactivities of alkylating agents was developed, based on competitve alkylation. The method is superior to the known colorimetric methods. The reactivities of the agents could also be correlated with the 13 C chemical shifts of the a-methylene. The method was successfully applied for the ranking of "soft" alkylating agents of low reactivity. It was recently found that "soft" alkylating RI 
  Reference    Z. Naturforsch. 35b, 758—763 (1980); received February 4 1980 
  Published    1980 
  Keywords    Alkylating Agents, Soft Drugs, NMR Spectra, Competitive Alkylation, Soft Quaternary Salts 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0758.pdf 
 Identifier    ZNB-1980-35b-0758 
 Volume    35 
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