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  • 1
    Electronic Resource
    Electronic Resource
    Lipid composition and structure of commercial parenteral emulsions
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Lipids and Lipid Metabolism 1213 (1994), S. 149-158 
    Details
    ISSN: 0005-2760
    Keywords: Fat particle ; Liposome ; NMR ; Parenteral fat emulsion ; Phospholipid ; Sterol ; Triacylglycerol
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2760(94)90021-3
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of the lateral alkoxy chain length on the gas chromatographic properties of five liquid crystals (1997)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 20 (1997), S. 379-384 
    Details
    ISSN: 0935-6304
    Keywords: Capillary gas Chromatography ; Relative retention time ; Liquid Crystal ; Alkoxy lateral chain ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The gas Chromatographic properties of five laterally substituted liquid crystals are the subject of a comparative study. These liquid crystals belong to the homologous series: 2-alkoxy-3-methyl-4-(4-ethoxybenzoyl-oxy)-4′-(4-trans-n-pentyclcyclohexanecarboxyloxy) azobenzene, referred to as ALn, where n, the carbon number in the lateral alkoxy chain, is equal to 4, 6, 8, 10, or 12 carbon atoms. Their thermal properties were established by differential scanning calorimetry (DSC). It appears that the introduction of a lateral alkoxy chain affects the nematic temperature range which decreases when the carbon number increases. The chromatographic separation abilities of AL4, AL6, AL8, AL10, and AL12 were studied using capillary glass columns. The five liquid cystals are efficient before and after solid-nematic or nematic-liquid transitions; however, the plate numbers are higher in the nematic state. Interesting analytical properties were noted in various fields: iisomeric separation of alkanes, aromatics, polyaromatics, volatile aroma compounds, and cis and trans isomers. However, the chain length does not exert any great influence on the separation abilities.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240200707
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  • 3
    Electronic Resource
    Electronic Resource
    Gas chromatographic study of the thermal and analytical properties of a nematic luquid crystal and its cupric complex (1995)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 18 (1995), S. 304-308 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Nematic liquid crystal ; Cupric complex ; Transition temperatures ; Analytical performance ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The nematic compound N-4-(2′-(4″-dodecyloxybenzoyloxy)-4′-do-decyloxy)azobenzenyl-4-dodecyloxysalicylideneimine, known as LH, and its cupric complex, bis[N-4-(2′-(4″-dodecyloxybenzoyloxy)-4′-dodecyloxy)azobenzenyl-4-dodecyloxysalicylidene]iminato of copper (II), known as CuL2 have been used as stationary phases for gas chromatography. The thermal properties of LH and CuL2 have been determined with conventional metal columns, using n-alkanes as solute probes. Plots of In V0g against 1/T clearly show the temperature transitions of LH and CuL2. The analytical capabilities of the two stationary phases were established by use of 25 m glass capillary columns. Satisfactory separations were obtained for positional hydrocarbon and halocarbon isomers, aromatic and polyaromatic compounds, and volatile essential oil constitutents.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240180508
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  • 4
    Electronic Resource
    Electronic Resource
    Etude RMN de l'Acetone en Solution dans une Phase Nematique (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 533-537 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The NMR spectrum of acetone oriented in the nematic phase of butyl-p-(p′-ethoxyphenyloxycarbonyl) phenyl carbonate has been studied in the 48° to 58°C temperature range. The determination of direct coupling constants allows the computation of orientation parameters; these values lead us to emphasize the intervention of polarizability in orientation phenomena.
    Notes: Le spectre RMN de l'acétone orientée dans le p-(p′ ethoxyphenyloxycarbonyl)phényl carbonate de butyle est étudié dans l' intervalle de température 48° à 58°C. La mesure des constantes de couplage direct permet de calculer les facteurs d' orientation moléculaires; ceux-ci permettent de mettre en évidence ici l' intervention de la polarisabilité dans le phénoméne d' orientation.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270030506
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  • 5
    Electronic Resource
    Electronic Resource
    Deformation of methylenecyclopropane in solution: NMR study in the nematic phase at 240 and 400 MHz (1980)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 14 (1980), S. 55-57 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The NMR spectrum of methylenecyclopropane oriented in two nematic phases has been measured at 240 and 400 MHz. Ratios of the proton-proton distances have been obtained. These values are compared with those deduced from the structure of the molecule in the gaseous state; they suggest an increase of the ethylenic angle in the nematic phase.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270140113
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  • 6
    Electronic Resource
    Electronic Resource
    Etude structurale de la bipyrimidine par RMN en phase nématique (1974)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 6 (1974), S. 622-624 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The 240 MHz NMR spectra of bipyrimidine in the nematic phase of p-methoxybenzylidene-p-n-butylaniline is analysed. The para H,H inter-ring distance is determined. The barrier to internal rotation of the inter-ring C—C bond is studied. Excellent agreement between experimental and calculated spectra is obtained using potential function V(φ) = ½ ΣNVn (1 - cosn φ) with V1 = V2 = V3 = 0 cal mol-1 and V4 = 500 cal mol-1.
    Notes: Le spectre de RMN obtenu à 240 MHz pour la bipyrimidine orientée dans un solvant nématique p-métoxybenzylidène p-n-butyl aniline est analysé. La distance entre les hydrogènes en position para est déterminée. La barrière de potentiel s'opposant à la libre rotation autour de la liaison centrale C—C est étudiée. Un excellent accord est obtenu entre spectre calculé et spectre expérimental lorsqu'on utilise une fonction potentielle V(φ) = 1/2 ΣNVn (1 - cosn φ) avec V1 = V2 = V3 = 0 cal mol-1 et V4 = 500 cal mol-1.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270061203
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  • 7
    Electronic Resource
    Electronic Resource
    Résonance Magnétique Nucléaire en phase nématique. Exploration de la barrière d'empêchement à la libre rotation de la monofluoroacétone (1974)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 6 (1974), S. 11-15 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The NMR spectra of monochloro-, monobromo- and monofluoroacetone (CH3—CO—CH2X with X = Cl, Br, F) oriented in a nematic phase have been measured and the direct dipolar coupling constants determined. The barrier to internal rotation for the CH2F group has been studied for fluorine compound using various hypotheses. The best agreement with IR data has been obtained using the potential equation V(θ) = Σn Vn × (1 - cos nθ)/2 and a Boltzmann distribution of the CH2F group (V1 = 250 ± 50 cal.mol-1, V2 = 1650 ± 100 cal.mol-1, V3 = -1000 ± 100 cal.mol-1).
    Notes: Les spectres RMN des monochloro-, monobromo- et monofluoroacétone orientées dans une phase nématique ont été interprétés et les constantes de couplage dipolaire mesurées. La barrière s'opposant à la libre rotation du groupement CH2F a été étudiée pour le composé fluoré à l'aide de différentes hypothèses. En utilisant une répartition de Boltzmann pour peupler les différentes conformations du groupement CH2F, et une fonction potentielle de la forme V(θ) = Σn Vn(1 - cos n θ)/2, on obtient un bon accord avec les résultats d'infra-rouge pour V1 = 250 ± 50 cal.mol-1, V2 = 1650 ± 100 cal.mol-1, V3 = -1000 ± 100 cal.mol-1.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270060105
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  • 8
    Electronic Resource
    Electronic Resource
    Résonance Magnétique Nucléaire en phase nématique. Exploration de la barrière d'empêchement à la libre rotation pour le fluorure d'acroyle et l'acroléine (1974)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 6 (1974), S. 151-154 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The NMR spectrum of acrolein and acroyl fluoride (CH2=CH—COX with X=H and F) oriented in a nematic phase has been measured and information about conformational equilibrium s-cis ⇄ s-trans has been obtained. The barrier to internal rotation of the COX group has been studied with various hypotheses. Good agreement between experimental and calculated spectra has been obtained using the potential equation V(φ) = ΣnVn(1 - cos nφ)/2, with V1 = -200 cal mol-1, V2 = 1500 cal mol-1 and V3 = 400 cal mol-1 for the fluorine compound, and V1 = 1200 cal mol-1, V2 = 3000 cal mol-1 and V3 = 2000 cal mol-1 for acrolein; this last compound is found to be mostly in the s-trans conformation.
    Notes: Les spectres RMN de l'acroléine et du fluorure d'acroyle (CH2=CH—COX avec X=H et F) orientés dans une phase nématique ont été interprétés et des informations sur l'équilibre conformationnel s-cis ⇄ s-trans ont été obtenues. La barrière s'opposant à la libre rotation du groupement COX a été étudiée à l'aide de différentes hypothèses. Un bon accord a été obtenu entre les spectres expérimentaux et les spectres calculés en utilisant une fonction potentiel V(φ) = ΣnVn(1 - cos nφ)/2, avec V1 = -200 cal mol-1, V2 = 1500 cal mol-1 et V3 = 400 cal mol-1 pour le composé fluoré; et V1 = 1200 cal mol-1, V2 = 3000 cal mol-1 et V3 = 2000 cal mol-1 pour l'acroléine; ce dernier composé existe presque exclusivement sous la forme s-trans.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270060305
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  • 9
    Electronic Resource
    Electronic Resource
    High resolution NMR in solids; A simple and improved ‘magic angle’ probe design for conventional small gap 13C FT spectrometers (1981)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 16 (1981), S. 85-89 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mechanical and electronic design of a ‘magic angle’ NMR probe is described. This probe can be incorporated in a conventional small gap 13C FT spectrometer, without any hardware or software change, to obtain high resolution 13C NMR spectra on organic solids. A simple way of tuning the homogeneity and adjusting the angle is also proposed. Illustrative experimental results on various types of molecular crystals with different molecular mobilities, a clathrate compound and a polymer are discussed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270160204
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  • 10
    Electronic Resource
    Electronic Resource
    NMR study of bicyclopropylidene in the nematic phase at 400 MHz (1982)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 19 (1982), S. 63-65 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The eight spin NMR spectrum (400 MHz) of bicyclopropylidene oriented in a nematic phase has been analysed. The absolute signs and values of 5J(HH) long-range spin-spin coupling constants have been determined for the first time for this molecule. The ratios of interatomic H—H distances have been deduced from the direct coupling constants.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270190202
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