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  • Wiley-Blackwell  (12)
  • Wiley  (8)
  • Springer Nature  (5)
  • International Union of Crystallography (IUCr)  (3)
  • 1995-1999  (28)
  • 1955-1959
  • 1997  (28)
  • 1
    Electronic Resource
    Electronic Resource
    Aminoguanidinium Squarate (1997)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 53 (1997), S. 0-0 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270197099460
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  • 2
    Electronic Resource
    Electronic Resource
    A Synchrotron X-ray Study of Ferroelectric Switching, Domain Reversal and Piezoelectric Moduli in CsTiOAsO4, Under an Applied Electric Field (1997)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 30 (1997), S. 383-387 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Single crystals of caesium titanyl arsenate (CTA, CsTiOAsO4), with space group Pna21 and isomorphous with potassium titanyl phosphate (KTP, KTiOPO4), have been studied using high-resolution synchrotron X-rays. During the experiments, an electric field was applied along the polar axis [001]. Single-crystal plates, between 300 and 450 μm thick along [001], were polarized by a variable square wave of frequency 20 Hz alternately applied to each side of the plate. A field-induced splitting of the + /− peaks for reflections hkl with l ≠ 0 was observed. This splitting provides information about the coercive field, polarizability and the piezoelectric strain tensor. Two of the piezoelectric coefficients of CTA could be estimated as d31 ∼ 1 and d33 ∼ 27 pm V−1. Whereas the coercive fields were estimated at 2300 V mm−1, the field necessary to reverse the domains just once in CTA was found to be either 560 or 1550 V mm−1, depending on the polarity of the reversed domain in relation to the polarity of the nonswitched part of the crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889897000708
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  • 3
    Electronic Resource
    Electronic Resource
    Rutile Superstructure of Sb0.9V1.1O4 (1997)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 53 (1997), S. 221-230 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The structure of Sb0.9V1.1O4, antimony vanadium oxide, has been studied by powder X-ray diffraction, electron diffraction and high-resolution electron microscopy (HREM). The X-ray powder diffraction pattern showed only basic rutile reflections [ar = 4.6085 (1), cr = 3.0867 (1) Å] and the basic rutile structure was refined using the Rietveld method. A rutile superstructure was revealed when the sample was studied by electron diffraction. The electron diffraction patterns were indexed on the unit cell a = 21/2ar, b = 21/2br, c = 2cr. Its space group, I41md, was determined by means of convergent-beam electron diffraction (CBED). A structural model based on alternating cation ordering along c in the chains of edge-sharing octahedra is proposed and its electron diffraction patterns and HREM image are calculated and matched with the experimental ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768196012955
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  • 4
    Electronic Resource
    Electronic Resource
    Flexible Molecules with Defined Shape, VII.Part VI: Ref. [1] Conformational Analysis of 3,5-Dimethylhexene Derivatives, Subunits of Polyketide Derived Natural Products (1997)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1997 (1997), S. 1757-1764 
    Details
    ISSN: 0947-3440
    Keywords: Conformational analysis ; Force field calculations ; MM3 ; Polyketide natural products ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2,4-Dimethylpentane (1) is a typical biconformational backbone segment. When one methyl group in 1 is replaced by a sp2 bound residue (vinyl, formyl, phenyl), as in compounds 3-6, a small preference for conformer 2b ensues, in which the sp2 bound group resides in the sterically more hindered position. Oxygen substituents in the 3-position do not change this conformational preference, but in concert with bulkier sp2-hybridized groups in the 2-position, a preference for the 2a backbone conformation may be induced, in which the sp2-hybridized group is in the less sterically hindered end-of-chain position, cf. compounds 20 and 23.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199719970819
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  • 5
    Electronic Resource
    Electronic Resource
    Singlet Oxygen Quenching Abilities of CarotenoidsDedicated to Professor Waldemar Adam on the occasion of his 60th birthday. (1997)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1997 (1997), S. 1887-1893 
    Details
    ISSN: 0947-3440
    Keywords: Carotenoids ; Isonorastacene synthesis ; Singlet oxygen ; Effective chain length ; Second-order quenching rate constants ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The bimolecular rate constants kq for quenching of singlet oxygen (1Δg state) by 26 different natural and novel synthetic carotenoids were determined at 37 °C in a mixture of chloroform and ethanol. The steady-state technique used involves the generation of 1O2 by thermal decomposition of disodium 3,3′-naphtalene-1,4-diyl-dipropionate endoperoxide (NDPO2) and the detection of its luminescence intensity at 1270 nm. Excitation energies (π,π*, 11Ag → 11Bu) and absorption maxima (430-590 nm) vary in the broadest range. Deeply coloured blue carotenoids are also included in the studies for the first time. An empirical correlation between the π,π* (11Ag → 11Bu) excitation energy and carotenoid structure (effective chain length Neff) was found: E(S) = 12642 cm-1 + 92027 cm-1 × 1/Neff. The quenching ability of the investigated carotenoids depends on the excitation energy of their transition at long wavelengths in a characteristic way showing as limiting factors either the thermal Arrhenius activation or the diffusion-controlled rate. This dependence and the suspected relationship between singlet E(S) and triplet E(T) energies, respectively, are discussed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199719970913
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  • 6
    Electronic Resource
    Electronic Resource
    Konformationsdesign eines voll flexiblen βII-Hairpin-AnalogonsDie Arbeit wurde von der Volkswagenstiftung gefördert. Wir danken dem Fonds der Chemischen Industrie für ein Promotionsstipendium (U.S.) und ein Kekulé-Stipendium (M.S.). Für die Aufnahme der IR-Spektren danken wir F. Schmock, für die Aufnahme der NMR-Spektren G. Häde (beide Marburg). (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 109 (1997), S. 1805-1807 
    Details
    ISSN: 0044-8249
    Keywords: Konformationsanalyse ; Peptidmimetica ; Wasserstoffbrücken ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19971091617
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  • 7
    Electronic Resource
    Electronic Resource
    Zum Mechanismus der McMurry-ReaktionTheoretische Untersuchungen metallorganischer Verbindungen, 27. Mitteilung. Diese Arbeit wurde durch die Deutsche Forschungsgemeinschaft (SFB 260, Graduiertenkolleg Metallorganische Chemie) und den Fonds der Chemischen Industrie unterstützt. - 26. Mitteilung: R. K. Szilagyi, G. Frenking, Organometallics, im Druck. (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 109 (1997), S. 2308-2311 
    Details
    ISSN: 0044-8249
    Keywords: Ab-initio-Rechnungen ; Carbonylverbindungen ; C-C-Verknüpfungen ; Reaktionsmechanismen ; Titan ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19971092017
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  • 8
    Electronic Resource
    Electronic Resource
    Zur Kristallstruktur von CaZn2(OH)6 · 2 H2O (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1287-1289 
    Details
    ISSN: 0044-2313
    Keywords: Calcium hexahydroxodizincate dihydrate ; synthesis ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Structure of CaZn2(OH)6 · 2 H2OThe electrochemical oxidation of zinc in a zinc/iron-pair leads in an aqueous NH3 solution of calciumhydroxide at room temperature to colourless crystals of CaZn2(OH)6 · 2 H2O. The X-ray structure determination was now successful including all hydrogen positions.P21/c, Z = 2, a = 6.372(1) Å, b = 10.940(2) Å, c = 5.749(2) Å, β = 101.94(2)° N(F2o ≥ 3σF2o) = 809, N(Var.) = 69, R/RW = 0.011/0.012The compound CaZn2(OH)6 · 2H2O contains Zn2+ in tetrahedral coordination by OH- and Ca2+ in octahedral coordination by four OH- and two H2O. The tetrahedra around Zn2+ form corner sharing chains, three-dimensionally linked by isolated polyhedra around Ca2+. Weak hydrogen bridge bonds result between H2O as donor and OH-.
    Notes: Die elektrochemische Oxidation von Zink in einem Zink/Eisen-Paar führt in einer wäßrigen NH3-Lösung von Calciumhydroxid bei Raumtemperatur zu farblosen Kristallen von CaZn2(OH)6 · 2 H2O. An ihnen wurde röntgenographisch die Struktur jetzt einschließlich aller H-Lagen bestimmt.P21/c, Z = 2, a = 6,372(1) Å, b = 10,940(2) Å, c = 5,749(2) Å, β = 101,94(2)° Z(F2o ≥ 3σF2o) = 809, Z(Var.) = 69, R/RW = 0,011/0,012In CaZn2(OH)6 · 2 H2O ist Zn2+ tetraedrisch von OH- und Ca2+ oktaedrisch von vier OH- und zwei H2O umgeben. Die Tetraeder um Zn2+ bilden Ketten über gemeinsame Ecken, die durch voneinander isolierten Oktaedern um Ca2+ dreidimensional verknüpft werden. Es liegen schwache H-Brückenbindungen von H2O als Donator zu OH- vor.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19976230819
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Kristallstruktur von SrZn(OH)4 · H2O (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1273-1276 
    Details
    ISSN: 0044-2313
    Keywords: Strontium tetrahydroxozincate monohydrate ; crystal structure refinement ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Structure of SrZn(OH)4 · H2OColorless crystals of SrZn(OH)4 · H2O are obtained by electrochemical oxidation of Zn in a zinc/iron pair in an aqueous ammonia solution saturated with strontium hydroxide. The X-ray crystal structure determination was now successful including all hydrogen positions: P1, Z = 2, a = 6.244(1) Å, b = 6.3000(8) Å, c = 7.701(1) Å, α = 90.59(1)°, β = 112.56(2)°, γ = 108.66(2)°, N(F2o ≥ 3σF2o) = 1967, N(Var.) = 84, R/Rw = 0.020/0.024.In SrZn(OH)4 · H2O Zn2+ is tetrahedrally coordinated by four OH- -ions while Sr2+ has 6 OH- and one H2O as neighbours. The polyhedra around Sr2+ are connected to chains which are linked three-dimensionally by isolated tetrahedra [Zn(OH)4]. Hydrogen bonds between H2O as donor and OH- are characterized by raman spectroscopy.
    Notes: Die elektrochemische Oxidation von Zink in einem Zink/Eisen Paar führt in einer wäßrigen ammoniakalischen Lösung von Strontiumhydroxid zu farblosen Kristallen von SrZn(OH)4 · H2O. An ihnen wurde röntgenographisch die Struktur jetzt einschließlich aller H-Lagen bestimmt: P1, Z = 2, a = 6,244(1) Å, b = 6,3000(8) Å, c = 7,701(1) Å, α = 90,59(1)°, β = 112,56(2)°, γ = 108,66(2)°, Z(F2o ≥ 3σF2o) = 1967, Z(Var.) = 84, R/Rw = 0,020/0,024.In SrZn(OH)4 · H2O ist Zn2+ tetraedrisch von OH- und Sr2+ von 6 OH- und einem H2O umgeben. Die Polyeder um Sr2+ bilden Ketten. Sie sind über isolierte Tetraeder [Zn(OH)4] dreidimensional verknüpft. Wasserstoffbrückenbindungen von H2O als Donator zu OH- sind durch Ramanspektroskopische Daten belegt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19976230816
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  • 10
    Electronic Resource
    Electronic Resource
    Tetrakis(triphenylphosphaniminato)titan, [Ti(NPPh3)4] (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1035-1036 
    Details
    ISSN: 0044-2313
    Keywords: Titanium compound ; Phosphorane iminato derivatives ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Tetrakis(triphenylphosphoraneiminato)titanium, [Ti(NPPh3)4]The title compound has been prepared by the reaction of [TiCl2(NPPh3)2] with methyllithium and cyclopentadienyllithium, respectively, in hexane solution. [Ti(NPPh3)4] · 3 C7H8 crystallizes from toluene solution to form colourless, only slightly moisture sensitive crystals which were characterized by a crystal structure determination. Space group I41/a, Z = 8, lattice dimensions at -80°C: a = b = 2160.7(2), c = 3334.2(3) pm, merohedral (110) twin, R = 0.077. The compound forms monomeric molecules with tetrahedrally coordinate titanium atoms and bonding parameters of TiN = 187.3 pm, PN = 155.1 pm, TiNP 150.4° in average.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19976230703
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