Kristallstruktur einer racemischen Lipid-Doppelschicht bestimmt mit Synchrotronstrahlung

Lehmann, Christian W.; Buschmann, J.; Luger, Peter; Demoulin, Corinna; Fuhrhop, Jürgen‐Hinrich; Eichhorn, K.

doi:10.1107/s010876819000492x

Cited by 5 publications

(1 citation statement)

References 3 publications

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“…Then it is found that the racemate crystals are often less soluble by two or three orders of magnitude, because face-to-face hydrogen bonding or similar dipolar interactions and symmetry are favoured. The fundamental example is tartaric acid which is more than a hundred times more soluble in water than racemic acid, because the latter forms a hydrogen bond cycle between the hydroxyl groups of the enantiomers (Parry 1951;Lehmann et al 1990).…”

Section: Ephedrinium Myristate Viscoelastic Fibresmentioning

confidence: 99%

Non-covalent chiral fibres in aqueous gels and their functionalization

et al. 1999

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The fully reversible synthesis of noncovalent assemblies which are held together by directed bonds is called synkinesis. Micdlar fibres with a distinct stereochemistry and gels are formed by amphlphfles forming strong hydrogen bonds between chiral head groups. The 3D-crystallization of such molecular assemblies, without dominating repulsive hydration forces, is prevented by the curvature of the fibres. Curvature might perhaps be directly connected with chirality. Addition of enantiomers often leads to an irreversible destruction of gels. Recent developments relating to 'hydropbobic water' in /~ngstriim-wide membrane gaps are also shortly discussed.

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Section: Ephedrinium Myristate Viscoelastic Fibresmentioning

confidence: 99%

Non-covalent chiral fibres in aqueous gels and their functionalization

et al. 1999

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Crystal Structure Analysis at Normal and Low Temperature Conditions

Luger

1993

Cryst. Res. Technol.

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80 years after its discovery X-ray diffraction presents itself as an outstanding method in structure determination which allows the most safe and accurate geometrical data of chemical structures to obtain compared to most other experimental methods. The major innovations in the recent past and the present state of crystal structure analysis are described together with some examples in inorganic and organic chemistry, including the use of synchrotron radiation.A variety of additional applications can be considered if the diffraction experiment is executed at low temperatures. Nitrogen gas stream devices and closed cycle helium cryostats are compared and their advantages/disadvantages are discussed. Finally some applications such as low temperature crystallization, temperature dependent structure analysis down to 20 K and deformation density work are illustrated. 80 Jahre nach ihrer Entdeckung prasentiert sich die Rontgenstrukturanalyse als eine ausgezeichnete Methode der Strukturbestimmung, mit der im Vergleich zu anderen experimentellen Techniken die sichersten, genauesten und umfangreichsten geometrischen Daten chemischer Strukturen erhalten werden konnen. Nach einem Uberblick iiber die wichtigsten Innovationen in den letzten Jahren wird der gegenwartige Stand der Kristallstrukturanalyse dargestellt mit Anwendungsbeispielen aus der anorganischen und organischen Chemie, einschlierjlich der Nutzung von Synchrontronstrahlung.Eine Vielzahl weiterer Anwendungen ist moglich, wenn das Beugungsexperiment bei tiefen Temperaturen stattfindet. Stickstoff-Gasstromanlagen und geschlossene Helium-Kryostaten werden verglichen und ihre Vor-bzw. Nachteile diskutiert. Schlierjlich werden Anwendungen wie Tieftemperaturkristallisation, temperaturabhangige Strukturanalyse (bis 20 K) und Deformationsdichtebestimmung behandelt.

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