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  • Wiley-Blackwell  (357)
  • American Meteorological Society
  • 1995-1999  (374)
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  • 1
    Electronic Resource
    Electronic Resource
    Imidotitanium Complexes with Heteroallylic Ligands: Synthesis and Solid-State Structure (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 87-91 
    Details
    ISSN: 1434-1948
    Keywords: Imido complexes ; Titanium ; Heteroallylic ligands ; Benzamidinate ligands ; Diiminophosphinate ligands ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Treatment of Ti(NtBu)Cl2(py)2 (1, py = pyridine) with bulky heteroallylic ligands in a 1:1 molar ratio affords the monosubstituted derivatives [PhC(NSiMe3)2]Ti(NtBu)Cl(py)2 (2), [MeOC6H4C(NSiMe3)2]Ti(NtBu)Cl(py) (3), and [Ph2P(NSiMe3)2]Ti(NtBu)Cl(py) (4). Similarly, 2:1 reactions afforded the disubstitution products [PhC(NiPr)2]2Ti(NtBu)(py) (6) and [Ph2P(NSiMe3)2]2Ti(NtBu) (7). The bis(pyridine) adduct Ph2P(NSiMe3)2Li(py)2 (5) was isolated as a by-product during the preparation of 4. The molecular structures of 7 has been established by X-ray crystallography.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Azobenzene-Based Photoswitchable Catenanes (1995)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1995 (1995), S. 649-656 
    Details
    ISSN: 0947-3440
    Keywords: Catenanes ; Interlocked rings ; Mechanical bond ; Photoswitches ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Four catenanes (1-4) and the corresponding tetracationic monocycles 5-8 are synthesized. X-ray structural analyses allow a prediction of the mobility (circumrotation) of the „interlocked“ rings in the catenanes, which is proven by 1H-NMR spectroscopy. An unexpected order in the crystal packing of 6 is demonstrated. (E/Z) isomerization in one ring influences the second ring of 1-4 and inversely. An existing obstacle inside the cavity of the switchable macrocycle can block this isomerization completely.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199519950491
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  • 3
    Electronic Resource
    Electronic Resource
    α-olefin oligomers and polymers with metallocene catalystsDedicated to Prof. Dr. rer. nat. Dr.-Ing. E. h. Hansjörg Sinn on the occasion of his 65th birthday (1995)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 227 (1995), S. 159-177 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Metallocen-Katalysatoren eröffnen neue Wege zur Synthese von Olefinoligomeren und -polymeren, deren Molekulargewichte und Schmelzpunkte in weiten Bereichen variieren. Einige wichtige Besonderheiten bei der Herstellung von Oligomeren, von wachsartigen sowie von hochmolekularen Polymeren durch Metallocen-Katalyse werden hier behandelt. Am Beispiel der Oligomerisation von Hexen wird ein einfaches kinetisches Modell entwickelt, das geeignet erscheint, den Reaktionsverlauf und die resultierende Oligomerenverteilung beim Einsatz von Metallocen-Katalysatoren zu beschreiben. Die Herstellung von Propylenpolymeren mit niedrigen und hohen Molekulargewichten durch Metallocen-Katalyse wird hinsichtlich der Reaktionsbedingungen und der Produkteigenschaften mit bekannten Prozessen verglichen. Ferner wurde der Einfluß von verschiedenen Unregelmäßigkeiten der Polymerketten, wie Kettenenden, Regioirregularitäten und Comonomersegmenten auf die Schmelzpunkte untersucht.
    Notes: Metallocenes offer new synthetic routes to olefin oligomers and polymers covering a wide range of molecular weights and melting points. This paper deals with some important features of the preparation of oligomers, wax-like polymers as well as highmolecular-weight polymers via metallocene catalysis. Taking the oligomerization of hexene as an example, a simple kinetic scheme is established, which is suitable to describe the course of the reaction and the resulting oligomer distribution with metallocenes as catalysts. For low and high-molecular-weight polymers, the metallocene route to polypropylene is compared to existent processes in terms of reaction conditions and product properties. An attempt is made to separate the effect of different chain defects like chain ends, regioirregularities and comonomers on the melting point.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1995.052270115
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  • 4
    Electronic Resource
    Electronic Resource
    Herstellung von reinen C60-Schichten im Schullabor (1995)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 29 (1995), S. 29-32 
    Details
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ciuz.19950290109
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  • 5
    Electronic Resource
    Electronic Resource
    Computer simulations of x-ray scattering curves: Gelation and crystallization process in amylose solutions (1995)
    New York : Wiley-Blackwell
    Biopolymers 35 (1995), S. 271-288 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Small- and wide-angle x-ray scattering is used for structural characterization of amylose solutions and gets. Recently published coordinates determined by x-ray fiber structure analysis and electron diffraction [A. Imberty and S. Perez: (1988) Biopolymers, Vol. 27. pp. 1205-1212: H. C. Wu and A. Sarko (1978) Carbohydrate Research, Vol. 6.1, pp. 7-40]. X-ray crystallography [W. Hinrichs & W. Saenger (1990) Journal of the American Chemical Society, Vol. 112. pp. 2789-2796], and theoretically calculated atomic coordinates for energy-minimized conformers of amylose molecules in solution and crystals served to simulate small- and wide-angle x-ray scattering curves. The simulation of scattering curves renders possible a quick screening and detection of special features in experimental curves and the decision of whether they are significant or not. The scattered intensities of the models were calculated using the atomic scattering factors and van der Waals radii within the framework of the improved cube method [J. J. Müller (1983) Journal of Applied Crystallography, Vol. 16, pp. 74-82]. All model data and the scattering curves are stored for a fast information retrieval in the database OBIOSCAT controlled by the ORACLE management system.In the context of a mixture of diflerent structures existing in an amylose solution or gel, theparallel-stranded left-handed B-form double helices (Imberty and Perez) do not scatter in a way that is significantly different from that of the parallel-stranded right-handed duplex proposed by Wu and Sarko. The structure of the energy-minimized left-handed parallel-stranded double helix is very similar to that of the canonical B form, but energy-minimized right-handed duplexes with parallel or antiparallel strands have structures that produce new scattering features. Up to now, such features have not been experimentally detected. Extended or collapsed single helices, too, can be discriminated by their scattering features from double helices for scattering vectors larger than 5 nm-1, and the energy-minimized left-handed single helices are nearly identical with the V-forms experimentally found in fibres [G. Rappenecker and P. Zugenmaier (1981) Carbohydrate Research, Vol. 89, pp. 11-19.].Because the investigated amylose gels contain crystallites. The growing of V- and B-form nanocrystallites up to dimensions of 20 nm was simulated with atomic resolution. The scattering curves of independently scattering nunocrystals hold information about crystallite shape, size, surrounding, and the structure, factors of the asymmetric unit in the unit cell, hence, they differ remarkably from the recently published fiber-structure factors and provide this structure information at an early stage of crystallization.Experimental scattering data of wheat amylose recorded during the gelation process can explained by a remarkable amount of V-helices with 6-12 glucopyranosyl residues in solution at 70°C. Extended single helices probably exist also under these conditions. A mixture of independently scattering V- and B-form nanocrystallites is detectable in freshly cooled samples (40°C), and pure B-form nanocrystallites embedded in a matrix of an electron density comparable to that in the crystallites exist together with amorphous material afterjve weeks of aging at 21°C. From the scattering of the amylose sample during the gelation process it follows that Gidley's gelation model [M. J. Gidley (1989) Macromolecules, Vol. 22, pp. 351-358], which assumes crystallization during the phase separation, is prejerred to the model proposed by Miles et al. [M. J. Miles, V. J. Morris, and S. G. Ring (1985) Carbohydrate Research, Vol. 135, pp. 257-269], where crystallization is preceded by phase separation. © 1995 John Wiley & Sons, Inc.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360350303
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  • 6
    Electronic Resource
    Electronic Resource
    Die Kristallstruktur von KPdMIVF7 (MIV = Zr, Hf) (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1047-1052 
    Details
    ISSN: 0044-2313
    Keywords: Zirconium fluoride ; hafnium fluoride ; ternary fluorides ; KPdMIVF7 (MIV = Zr, Hf) ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Crystal Structure of KPdMIVF7 (MIV = Zr, Hf)Blue single crystals of KPdZrF7 are obtained by heating the binary fluorides in sealed Pt-tubes under dry argon (solid state reaction, T ≍ 720°C, t ≍ 14 d). The compound crystallizes orthorhombically in the space group Pnna-D2h6 (Nr. 52); lattice parameters are a = 1 132.3(5) pm, b = 797.5(2) pm, c = 639.8(1) pm; Z = 4 (Four cycle diffractometer data, AED2). According to [F4PdF2/1ZrF5] distortet [PdF6]-octaedra are connected with pentagonal-bipyramidal [ZrF7]-polyhedra via two bridging F-, resulting in [PdZrF11]-groups. These [PdZrF11]-groups built up a threedimensional-network with K+ in its spacings. KPdHfF7 crystallizes isotypically (a = 1 136.1(3) pm, b = 796.4(2) pm und c = 638.8(1) pm; four cycle diffractometer data, AED2).
    Notes: Durch Tempern der binären Fluoride im verschweißten Pt-Rohr unter Schutzgas (Ar, Festkörperreaktion, T ≍ 720°C, t ≍ 14d) erhält man blaue Einkristalle von KPdZrF7 [eigener Strukturtyp, orthorhombisch, Pnna-D2h6 (Nr. 52); a = 1 132,3(5) pm, b = 797,5(2) pm, c = 639,8(1) pm; Z = 4; Vierkreisdiffraktometerdaten AED2]. Pd2+ ist verzerrt oktaedrisch von 6 F- umgeben, wohingegen Zr4+ pentagonalbipyramidal von 7 F- koordiniert wird. Beide Koordinationspolyeder sind gemäß [F4PdF2/1ZrF5] kantenverknüpft und bilden mit weiteren solcher [PdZrF11]-Einheiten durch Eckenverknüpfung ein dreidimensionales Raumnetz, in dessen Lücken K+ eingelagert ist. Nach Vierkreisdiffraktometerdaten (AED2) kristallisiert KPdHfF7 isotyp (a = 1 136,1(3) pm, b = 796,4(2) pm und c = 638,8(1) pm).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210626
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  • 7
    Electronic Resource
    Electronic Resource
    Cs2Cu3MIVF12 (MIV = Zr, Hf) - Kristallstruktur und magnetische Eigenschaften (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 993-1000 
    Details
    ISSN: 0044-2313
    Keywords: Zirconium(IV) fluoride ; hafnium(IV) fluoride ; Cs2Cu3MIVF12 (MIV = Zr, Hf) ; crystal structure ; magnetic properties ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cs2Cu3MIVF12 (MIV = Zr, Hf) - Crystal Structure and Magnetic BehaviourColourless single crystals of Cs2Cu3ZrF12 are obtained by heating the binary fluorides in sealed Pt-tubes under dry argon (solid state reaction, T ≍ 700°C, t ≍ 7-10 d). The compound crystallizes trigonal-rhomboedrical in the space group R3m-D3d5 (Nr. 166); lattice parameters are a = 716.61(6) pm, c = 2 046.4(2) pm, Z = 3 (Four cycle diffractometer data, AED 2). The structure is dominated by layers of corner-sharing, Jahn-Teller-distorted [CuF6]-Octahedra, which are connected via regular [ZrF6]-Octahedra to stackings parallel [00.1]. Cs+-ions are located in the spacings of the octahedra-network. From powder data Cs2Cu3HfF12 with a = 716.32(4) pm, c = 2 048.6(2) pm is isotypic. Both compounds show antiferromagnetic behaviour already at temperatures about 200 K.
    Notes: Durch Umsetzung der binären Fluoride im verschweißten Pt-Rohr unter Schutzgas (Ar, Festkörperreaktion, T ≍ 700°C, t ≍ 20d) erhält man farblose Einkristalle von Cs2Cu3ZrF12. [Trigonal-rhomboedrisch, R3m-D3d5 (Nr. 166), a = 716,61(6) pm, c = 2 046,4(2) pm, Z = 3 (Vierkreisdiffraktometerdaten, AED 2)]. Strukturbestimmend sind Schichten eckenverknüpfter, Jahn-Teller-verzerrter [CuF6]-Oktaeder, welche - über reguläre [ZrF6]-Oktaeder verknüpft - Stapel entlang [00.1] bilden. In den Hohlräumen der Struktur sind Cs+-Ionen eingelagert. Nach Pulverdaten kristallisiert Cs2Cu3HfF12 mit a = 716,32(4) pm, c = 2 048,6(2) pm isotyp. Beide Stoffe zeigen bereits bei Temperaturen um 200 K antiferromagnetisches Verhalten.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210617
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  • 8
    Electronic Resource
    Electronic Resource
    Titantetrafluorid - Eine überraschend einfache Kolumnarstruktur (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1227-1231 
    Details
    ISSN: 0044-2313
    Keywords: TiF4 ; preparation, single crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Titanium Tetrafluoride - a Surprising Simple Column StructureFor the first time single crystals of TiF4 have been obtained by solvothermal decomposition of (O2)2Ti7F30 in anhydrous HF. The colourless, transparent needles crystallize orthorhombic in spacegroup Pnma-D2h16 (No. 62) with a = 2 281.1, b = 384.8, c = 956.8 pm, Z = 12. The new type of structure is dominated by isolated columns of corner-linked TiF6-octahedra.
    Notes: Durch Solvothermalsynthese in wasserfreier HF gelang es endlich erstmals, TiF4 aus (O2)2Ti7F30 in Form solcher Einkristalle darzustellen, die eine Strukturbestimmung ermöglichten. Die farblosen, transparenten Nadeln kristallisieren in der Raumgruppe Pnma-D2h16 (Nr. 62) mit a = 2 281,1, b = 384,8, c = 956,8 pm, Z = 12. TiF4 bildet einen eigenen Strukturtyp, dessen charakteristisches Merkmal von einander isolierte, aus TiF6-Oktaedern aufgebaute Säulen sind (Kolumnarstruktur).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210720
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Kristallstruktur von LiPdGaF6, RbPdAlF6 und K1,06Pd0,95Fe1,05F6 (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1385-1394 
    Details
    ISSN: 0044-2313
    Keywords: Palladium ; quaternary fluorides ; LiPdGaF6 ; RbPdAlF6 ; K1.06Pd0.95Fe1.05F6 ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Crystal Structure of LiPdGaF6, RbPdAlF6 and K1.06Pd0.95Fe1.05F6Single crystals of LiPdGaF6 (blue; trigonal, P31c-D3d2 (No. 163), a = 505.72(2), c = 923.7(2) pm; LiCaAlF6-Type [1]), RbPdAlF6 (violet; orthorhombic, Pnma-D2h16 (No. 62), a = 729.0(1), b = 711.1(1), c = 1006.5(2) pm; CsAgFeF6-Type [2]) and K1.06Pd0.95Fe1.05F6 (greenish-blue; tetragonal, P42/mbc-D4h13 (No. 135), a = 1 279.07(7), c = 800.2(1) pm; K1,08MnFeF6-Type [3]; four cycle diffractometer data, Siemens AED2) are obtained by heating the binary fluorides in sealed Pd-tubes under dry argon [solid state reaction, T ≈ 650, t ≈ 19 d (39 d, 24 d)].
    Notes: Durch Umsetzung von äquimolaren Gemengen der binären Fluoride im verschweißten Pd-Rohr unter Schutzgas [Ar, Festkörperreaktion, T = 650°C, t = 19 d (39 d, 24 d)] erhält man Einkristalle von LiPdGaF6 (blau, trigonal, P31c-D3d2 (No. 163), a = 505,72(2), c = 923,7(2) pm, LiCaAlF6-Typ [1]), RbPdAlF6 (violett, orthorhombisch, Pnma-D2h16 (No. 62), a = 729,0(1), b = 711,1(1), c = 1006,5(2) pm, CsAgFeF6-Typ [2]) sowie K1,06Pd0,95Fe1,05F6 (blau-grün, tetragonal, P42/mbc-D4h13 (No. 135), a = 1279,07(7), c = 800,2(1) pm; K1,08MnFeF6-Typ [3]; jeweils Vierkreisdiffraktometerdaten).
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210818
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  • 10
    Electronic Resource
    Electronic Resource
    NADH-Induced Changes of the Nickel Coordination within the Active Site of the Soluble Hydrogenase from Alcaligenes eutrophus: XAFS Investigations on Three States Distinguishable by EPR SpectroscopyThis work was supported by the Deutsche Forschungsgemeinschaft (DFG), the Bundesministerium für Bildung, Wissesnchaft, Forschung und Technologie (BMBF), and the Fonds der Chemischen Industrie.Dedicated to Professor Günter Schmid on the occasion of his 60th birthday (1997)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 36 (1997), S. 1747-1750 
    Details
    ISSN: 0570-0833
    Keywords: enzymes ; EXAFS spectroscopy ; hydrogenases ; iron ; nickel ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.199717471
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