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  • Inorganic Chemistry  (5)
  • Electron microscopy  (2)
  • Mathematics and Statistics  (2)
  • Wiley-Blackwell  (9)
  • American Institute of Physics
  • 1
    ISSN: 0044-2313
    Keywords: Electrochemical synthesis ; nickel(II) complexes of Schiff bases ; 2,2′ bipyridine bis 2-(phenyl)-iminomethyl pyrrolato nickel(II) ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Elektrochemische Synthese von Nickel(II)-Komplexen mit Schiffschen Basen: Kristallstruktur von 2,2′-Bipyridin-bis{2-[(phenyl)iminomethyl]pyrrolato}nickel(II)Die elektrochemische Oxidation von anodischem Nickel in einer Acetonitril-Lösung mit einer aus H-pyrrole-2-carbaldehyd abgeleiteten Schiffschen Base, einem substituierten Anilin und einem Stickstoff-Liganden (1,10-Phenanthroline (phen), 2,2′-Bipyridin (bipy) oder Pyridin (py)) liefert die gemischten Komplexe NiL2 · phen, NiL2 · bipy bzw. NiL2 · (py)2. Die Kristallstruktur von 2,2′-Bipyridin bis{2-[(phenyl)iminomethyl]-pyrrolato}nickel(II) wurde röntgenographisch bestimmt. Der. Komplex kristallisiert triklin in der Raumgruppe P1, mit den Gitterkonstanten a = 12,316(1), b = 13,169(4), c = 17,251(3) Å, α = 82,67(3)°, β = 83,66(1)°, γ = 87,34(2)°, Z = 4; besteht aus monomeren Molekülen mit der zentralen NiN6-Einheit mit verzerrt oktaedrischer Geometrie.
    Notes: The electrochemical oxidation of anodic nickel in acetonitrile solution containing both (a) a Schiff base HL derived from H-pyrrole-2-carbaldehyde and a substituted aniline, and (b) a nitrogen ligand (1, 10-phenanthroline (phen), 2,2′-bipyridine (bipy) or pyridine (py)) yielded the mixed complexes NiL2 · phen, NiL2 · bipy and NiL2 · (py)2. The crystal structure of 2,2′-bipyridine bis{2-[(phenyl)iminomethyl]pyrrolato}nickel(II) was determined by X ray diffraction. Crystals are triclinic space group P1, with four molecules in the unit cell of dimensions a = 12.316(1), b = 13.169(4), c = 17.251(3) Å, α = 82.67(3)°, β = 83.66(1)° and γ = 87.34(2)°, and consist of monomeric molecules in which the central NiN6 unit has a distorted octahedral geometry.
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  • 2
    ISSN: 0044-2313
    Keywords: Electrochemical synthesis ; Schiff bases metal complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Elektrochemische Synthese von Metall(II)-Komplexen mit Schiffschen Basen: Kristallstruktur von Bis{2-[(4-methylphenyl)iminomethyl]pyrrolato}kupfer(II)Die elektrochemische Oxidation von anodischem Metall (Nickel, Kupfer, Zink, Cadmium) in einer Acetonitril-Lösung mit einer aus H-pyrrol-2-carbaldehyd abgeleiteten Schiffschen Base eines substitutierten Anilins (HL) liefert die gemischten Komplexe ML2. Die Kristallstruktur von Bis{2-[(4-methylphenyl)iminomethyl]pyrrolato}kupfer(II) wurde röntgenographisch bestimmt. Der Komplex kristallisiert monoklin in der Raumgruppe P21/n, a = 9,356(2), b = 16,697(2), c = 14,145(2) A, β = 108,47(2)°, Z = 4, und er besteht aus monomeren Molekülen, von denen die zentrale CuN4-Einheit eine verzerrt-tetraedrische Geometrie besitzt mit einem Diederwinkel der Flächen von 25,8(3)°. Die IR, 1H-NMR und UV-VIS Spektren werden im Zusammenhang mit der Struktur diskutiert.
    Notes: The electrochemical oxidation of anodic nickel, copper, zinc or cadmium in acetonitrile solutions of Schiff bases (HL) derived from H-pyrrole-2-carbaldehyde and substituted anilines gives compounds of general formula ML2. The crystal structure of bis{2-[(4-methylphenyl)iminomethyl]pyrrolato}copper(II) has been determined by X-ray diffraction. The compound crystallizes in the monoclinic space group P21/n with a = 9.356(2), b = 16.697(2), c = 14.145(2) Å and β = 108.47(2)°. The crystal structure consists of monomeric molecules in which the central CuN4 unit has distorted square-planar geometry with a dihedral angle of 25.8(3)° between the coordination planes. The IR, 1H NMR and UV-visible spectra of the complexes are discussed and related to the structure.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 556 (1988), S. 223-226 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Elektrochemische Synthese von Zink- bzw. Cadmium-Komplexen mit 2-(N-2-Pyridyl-formimidoyl)phenol und seinen MethylderivatenDurch elektrochemische Oxydation des Metals als Anode in einer nicht-wäßrigen Lösung des entsprechenden Liganden werden in guter Ausbeute ZnII- bzw. CdII-Komplexe mit den Anionen von Schiffschen Basen hergestellt. Die Basen sind durch Kondensation von Salicylaldehyd mit verschiedenen 2-Aminopyridinen synthetisiert worden. Die Komplexe wurden durch Elementaranalyse, IR und 1H-NMR charakterisiert.
    Notes: Complexes of ZnII and CdII with the anionic forms of the Schiff bases obtained from the condensation between salicyladehyde and several 2-aminopyridines have been synthesized in good yield by electrochemical oxidation of the appropriate sacrificial anode in nonaqueous solution of the corresponding ligand. The resultant compounds have been characterised by elemental analysis, I.R., and 1H-N.M.R.
    Additional Material: 3 Tab.
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Numerical Methods for Partial Differential Equations 6 (1990), S. 167-175 
    ISSN: 0749-159X
    Keywords: Mathematics and Statistics ; Numerical Methods
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Numerical Methods for Partial Differential Equations 11 (1995), S. 423-444 
    ISSN: 0749-159X
    Keywords: Mathematics and Statistics ; Numerical Methods
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics
    Notes: This article presents a numerical study of a spectral problem that models the vibrations of a solid-fluid structure. It is a quadratic eigenvalue problem involving incompressible Stokes equations. In its numerical approximation we use Lagrange finite elements. To approximate the velocity, degree 2 polynomials on triangles are used, and for the pressure, degree 1 polynomials. The numerical results obtained confirm the theory, as they show in particular that the known theoretical bound for the maximum number of nonreal eigenvalues admitted by such a system is optimal. The results also take account of the dependence of vibration frequencies with respect to determined physical parameters, which have a bearing on the model. © 1995 John Wiley & Sons, Inc.
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  • 6
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Direkte elektrochemische Synthese und Kristallstruktur des Zink(II)-carbamato-Komplexes{[N-methyl-N′-[(2-pyrrolyl)methylen]ethylendiamin][N-methyl-N-[2-[(2-pyrrolato)methylenamino]ethyl]carbamato]}zink(II)Die elektrochemische Oxidation von anodischem Zink in Acetonitril-Lösung einer Schiffschen Base, die aus Hpyrrol-2-carbaldehyd und N-methylethyldiamin dargestellt wurde, ergibt[Zn(C8H13N3)(C9H11N3O2)], dessen Kristallstruktur röntgenographisch bestimmt wurde. Die Verbindung kristallisiert im orthorhombischen Kristallsystem, mit der Raumgruppe Pbca und a = 13,757(2), b = 17,748(4), c = 14,808(4) Å, Z = 8. Die Verfeinerung führte bis zu einem R-Wert von 0,049 für 1407 unabhängige, beobachtete Reflexe. Die Kristallstruktur besteht aus monomeren Molekülen, in denen die zentrale ZnN4O-Einheit eine verzerrt trigonal bipyramidale Geometrie aufweist. Die Carbamatogruppe ist einzähnig gebunden.
    Notes: The electrochemical oxidation of anodic zinc in an acetonitrile solution of a Schiff base derived from Hpyrrole-2-carbaldehyde and N-methylethylenediamine gives [Zn(C8H13N3)-(C9H11N3O2)], whose crystal structure has been determined. The compound crystallizes in the orthorhombic space group Pbca (No. 61) with a = 13.757(2), b = 17.748(4), c = 14.808(4) Å and Z = 8. Refinement converged to R = 0.049 for 1407 independent observed reflections. The crystal structure consists of monomeric molecules in which the central ZnN4O unit has distorted trigonal bipyramidal geometry and the carbamato group is monodentate.
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  • 7
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Elektrochemische Synthese von neutralen Nickel(II)-Komplexen mit Schiffschen Basen: Kristallstruktur von Bis-{N-[2-(2-pyridyl) äthyl]-salicylideneiminato}nickel(II) TrihydratNickel(II)-Komplexe mit im Pyridin-Ring substituiertem N-2-(2-pyridyl)-äthyl-salicylideneiminat wurden durch Elektrolyse einer nicht wäßrigen Lösung des entsprechenden Liganden hergestellt; als Anode diente ein Ni-Draht. Die Struktur von Bis-{N-[2-(2-pyridyl)äthyl]-salicylideneiminato}nickel(II). Trihydrat wurde röntgenographisch bestimmt. Der Komplex kristallisiert triklin in der Raumgruppe P1 mit den Gitterkonstanten a = 13,055(4) Å, b = 13,097(6)Å, c = 16,189(5) Å, α = 102,92(3)°, β = 99,80(3)°, γ = 90,42(3)° und Z = 4. Eine Least-squares-Verfeinerung führte zu einem R-Wert von 0,047. Das Molekül ist nicht zentrosymmetrisch, da die zwei dreizähnigen Liganden eine meridionale Konfiguration um das oktaedrisch koordinierte Nickel(II) annehmen.
    Notes: Nickel(II) complexes with N-2-(2-pyridyl)ethyl-ring substituted salicylideneiminatos have been synthesized by an electrochemical procedure using a sacrificial anode in non-aqueous solution of the corresponding ligand. The structure of bis{N-[2-(2-pyridyl)]-salicylideneiminato}-nickel (II) trihydrate has been determined by X-ray diffraction. Crystals are triclinic, space group P1, with four formula units in a cell of dimensions a = 13.055(4) Å, b = 13.097(6) Å, c = 16.189(5) Å, and α = 102.92(3)°, β = 99.80(3)°, γ = 90.42(3)°. Full matrix least squares refinement on R converged with a conventional agreement factor of 0.047. The molecule is non-centrosymmetric with two terdentate ligands in a meridional configuration around octahedral nickel(II).
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Electron Microscopy Technique 2 (1985), S. 481-487 
    ISSN: 0741-0581
    Keywords: Morphometry ; Electron microscopy ; Computer program ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Natural Sciences in General
    Notes: A computer program is described that facilitates systematic and unbiased sampling in morphometry. Input data are coordinates of the four corners of a section as displayed in the position indicators of the microscope stage. Outputs are coordinate values in the form of a regular lattice that describes where to place the stage and perform the sampling on the section. In addition, some other data are provided by the program, such as total area of section, length of sides, etc. The program is written in BASIC but can be easily converted to other computer languages.
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Electron Microscopy Technique 7 (1987), S. 191-193 
    ISSN: 0741-0581
    Keywords: Morphometry ; Computer program ; Electron microscopy ; Stereology ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Natural Sciences in General
    Notes: We describe a short computer program, which is written in Pascal language, to measure the diameter of circular and elliptical profiles in sections. Coordinate pairs on the microscope stage, corresponding to two or three points of a profile, are input to obtain its diameter. The program enables one to take measurements directly on the microscope, thereby reducing photographic work and caliper measurement. While the program is largely designed for electron microscopy, it also may be useful for light microscopy morphometry.
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