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  • 1
    Electronic Resource
    Electronic Resource
    Strontium oxide iodide (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. i44-i45 
    Details
    ISSN: 1600-5368
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Strontium oxide iodide, Sr4OI6, has been prepared by a solid-state reaction and shown to be isostructural with both A4OCl6, where A is Ba or Sr, and Ba4OI6.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S1600536801006626
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  • 2
    Electronic Resource
    Electronic Resource
    Hexakis(dimethyl sulfoxide)nickel(II) dinitrate dimethyl sulfoxide disolvate (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. m556-m557 
    Details
    ISSN: 1600-5368
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The title compound, [Ni(C2H6OS)6](NO3)2·2C2H6OS, comprises centrosymmetric [Ni(dmso)6]2+ cations, nitrate anions and non-coordinated dimethyl sulfoxide solvent molecules. The octahedral geometry of the cation is very regular, with Ni—O interatomic distances and O—Ni—O interatomic angles falling within narrow ranges 2.0485 (9)–2.0665 (9) Å and 89.12 (4)–93.27 (4)°, respectively. Two weak C—H...O hydrogen-bonding contacts link cations and anions to form a chain which lies along the [111] direction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S1600536801016403
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  • 3
    Electronic Resource
    Electronic Resource
    Barium oxide iodide (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. i41-i43 
    Details
    ISSN: 1600-5368
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Barium oxide iodide, Ba4OI6, has been prepared by a solid-state reaction and shown to be isostructural with both A4OCl6, where A is Ba or Sr, and Sr4OI6.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S1600536801006614
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  • 4
    Electronic Resource
    Electronic Resource
    INFLUENCE OF FOOD MATRIX STRUCTURE AND ORAL BREAKDOWN DURING MASTICATION ON TEMPORAL PERCEPTION OF FLAVOR (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 12 (1997), S. 0 
    Details
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Perception of flavor intensity from a series of model foods was recorded during normal mastication by 8 subjects. Samples varied in gelatin concentration (5–25%) and in the sweetener added (sucrose or aspartame) and represented a range of physical and mechanical properties. All contained the same level of a commercial flavor (banana). Mastication patterns were recorded using electromyography simultaneously with sensory assessment. Increasing the mechanical strength and melting point of the samples resulted in longer chewing times and lower intensity and more prolonged flavor perception. The temporal pattern of flavor perception was closely linked with mastication patterns for each subject but exhibited large individual differences. Flavor perception was influenced by the habitual oral breakdown patterns for individuals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-459X.1997.tb00054.x
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  • 5
    Electronic Resource
    Electronic Resource
    Dichloromaleic anhydride (2000)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. e273-e273 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Although molecules of the title compound, 3,4-dichloro-2,5-dihydrofuran-2,5-dione (dichloromaleic anhydride, C4Cl2O3), (I), possess approximate non-crystallographic C2v symmetry, the two chlorine substituents deviate from the ring plane. Their deviations are in the same direction, but with values of 0.0356 (17) and 0.0167 (17) Å, they differ significantly in magnitude. The closest intermolecular contact is of 2.888 (2) Å between a carbonyl O atom and the C atom of a carbonyl group, with the O...C direction orthogonal to the C=O bond [O5...C2i=O2i 93.6 (2)°; symmetry code: (i) 3 \over 2 − x, −½ + y, z]. These contacts form infinite chains of molecules running parallel to the crystallographic b direction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270100007034
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  • 6
    Electronic Resource
    Electronic Resource
    Tris(2-methylphenyl)phosphonium tetrachloroborate (2000)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 1354-1355 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The title compound, C21H22P+·BCl4−, is the first structurally characterized example of the [HP(o-tolyl)3]+ cation, presented here with BCl4− as the counter-ion. The cation has a near-tetrahedral P atom and the BCl4− anion is near-tetrahedral at boron. There are no unusually short cation–anion contacts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270100010623
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  • 7
    Electronic Resource
    Electronic Resource
    μ-Peroxo-bis[trans-chloro(1,4,8,11-tetraazacyclotetradecane)cobalt(III)] bis(tetraphenylborate) diacetone solvate (2001)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 1159-1161 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The title complex, [Co2Cl2(μ-O2)(cyclam)2](C24H20B)2·2Me2CO, was obtained when [Co(cyclam)Cl2](BPh4)2 was crystallized from acetone in air; cyclam is 1,4,8,11-tetraazacyclotetradecane, C10H24N4. The peroxo O–O moiety straddles a crystallographic centre of inversion (the two octahedral Co atoms are symmetrically bridged by the O2 moiety), hence only half of the complex cation is in the asymmetric unit. A comparison of the O—O [1.483 (3) Å], Co—Cl [2.2647 (8) Å] and Co—O [1.894 (2) Å] bond lengths with similar bonds in previously determined structures indicates the oxidation of CoII to CoIII during the crystallization process. In the crystal lattice, cation dimers are encapsulated by six [BPh4]− anions, with C—H...π hydrogen bonds between the cyclam methylene groups and the phenyl rings of the anion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270101012173
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  • 8
    Electronic Resource
    Electronic Resource
    Bis(μ-2-cyanopyridine-N:N′)bis[(2-cyanopyridine-N)silver(I)] bis(tetrafluoroborate): an anion-linked molecular ladder (2001)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 1290-1291 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: In the title compound, [Ag2(C6H4N2)4](BF4)2, the AgI cations adopt distorted trigonal-planar coordination geometries. The AgI centres are linked via two bridging 2-cyanopyridine ligands to give a centrosymmetric dinuclear complex in which the AgI coordination environment is completed by monodentate non-bridging 2-cyanopyridine ligands. Bridging Ag...F(BF2)F...Ag interactions link the dinuclear cations into molecular ladders.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270101013956
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  • 9
    Electronic Resource
    Electronic Resource
    Diels–Alder adducts of medium-ring carbocyclic dienes prepared by rearrangement of catalytically generated cyclic oxonium ylides (2001)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 1326-1329 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The novel bicyclic and tricyclic systems dimethyl (4aS*,6S*)-6-methoxy-7-oxo-4a,5,6,7,8,9-hexahydro-2H-benzocycloheptene-3,4-dicarboxylate, C16H20O6, (I), dimethyl (4aS*,6R*)-6-methoxy-7-oxo-4a,5,6,7,8,9-hexahydro-2H-benzocycloheptene-3,4-dicarboxylate, C16H20O6, (II), (3aS*,9R*,10aS*,10bR*)-9-methoxy-2-oxa-1,3a,4,6,7,8,9,10,10a,10b-decahydro-3H-cyclohepta[e]indene-1,3,8-trione, C14H16O5, (III), and (1S*,2R*,9S*,10aR*)-9-methoxy-8-oxo-1,2,3,5,6,7,8,9,10,10a-decahydrobenzocyclooctene-1,2-dicarboxylic acid, C15H20O6, (IV), have been crystallographically characterized, allowing the determination of the relative configuration of the stereogenic centres. The poor quality of the dicarboxylic acid crystals necessitated the use of synchrotron radiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270101013440
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  • 10
    Electronic Resource
    Electronic Resource
    Intramolecular thermal (4σ + 2π) dyotropy: primary 2H kinetic isotope effects. Experimental limiting barrierparameters for quantum tunnelling in 2H transfer processes and mechanistically significant substituent effects (1998)
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 11 (1998), S. 879-886 
    Details
    ISSN: 0894-3230
    Keywords: intramolecular thermal (4σ + 2π) dyotropy ; kinetic isotope effects ; limiting barrier parameters ; quantum tunnelling ; 2H transfer processes ; Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Primary deuterium kinetic isotope effects (PDKIE) in parazoline-annelated syn-sesquinorbornenes exhibiting irreversible intramolecular (4σ + 2π) thermal dyotropy reveal unambiguous evidence for a tunnelling contribution to the kinetics in one instance but not for a close analogue. For analogous dyotropy of a cyclohexadiene-annelated syn-sesquinorbornene, the tunnelling components of the kinetic behaviour is small by comparison. The H atom traverse between alternative loci for the pyrazolines, deduced from x-ray and neutron diffraction data, is in agreement with approximate barrier parameters obtained by fitting of the PDKIE data to the Bell equation; barrier penetration is 3.22 kcal below the computed barrier corrected for the tunnelling contribution. The relative kinetic effect of systematic variation of the π-donor/acceptor groups on aryl ring substituents at C and N in the pyrazoline ring is consistent with a pericyclic process for dyotropy of these compounds, but not with rearrangement mediated by biradicals resulting from single H atom transfer in the rate-limiting step. Computer modelling of the transition state for dyotropy of these compounds is also consistent with a thermal, orbital symmetry conserved pericyclic reaction. Copyright © 1998 John Wiley & Sons, Ltd.
    Additional Material: 6 Ill.
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