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Digitale Medien

Phase and aggregation behaviour of double-chain cationic surfactants from the class of N-alkyl-N-alkyl′-N, N-dimethylammonium bromide surfactants (1999)

Haas, S. ; Hoffmann, H. ; Thunig, C. ; [weitere]

Springer

Colloid & polymer science 277 (1999), S. 856-867

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ISSN: 1435-1536

Schlagwort(e): Key words Double chain surfactants ; Aggregates ; Phase diagrams ; Lamellar phases ; Electron microscopy ; SANS

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie , Maschinenbau

Notizen: Abstract We present the phase diagrams and the properties of newly synthesised double-chain cationic N-alkyl-N-alkyl′-N,N-dimethylammonium bromide surfactants [C x C y DMABr (x = 12, 14 and 16; y = 10, 11, 12, 14 and 16)]. All the systems studied form liquid-crystalline lamellar phases but with different morphologies: unilamellar vesicles at low surfactant concentrations, multilamellar vesicles and tubular aggregates for surfactant concentrations between 2 and 10 wt% and at even higher concentrations planar bilayers of surfactant molecules in the classical Lα phase. The phase diagrams were determined with macroscopic and microscopic methods (polarisation microscopy, freeze-fracture transmission electron microscopy, scanning electron microscopy and differential interference contrast microscopy). The properties of the surfactant solutions were determined with differential scanning calorimetry measurements for Krafft point determination and small-angle neutron scattering measurements for interlamellar spacing and bilayer thickness. Finally, conductivity and viscosity measurements for phase characterisation were carried out.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s003960050462

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Digitale Medien

Bis(diphenylphosphano)alkan- und 1-(Diphenylphosphano)-2-(2-pyridino)ethan-N-Arylsulfinylamin-Nickel(0)-Komplexe (1995)

Wenschuh, E. ; Hoffmann, H. ; Wilhelm, D.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 621 (1995), S. 435-438

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ISSN: 0044-2313

Schlagwort(e): Nickel(0) complexes ; diphenylphosphanoalkane ; 1-diphenylphosphano-2-(2-pyridino)ethane ; N-arylsulfinylamine ligands ; Chemistry ; Inorganic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Beschreibung / Inhaltsverzeichnis: Bis(diphenylphosphano)alkane- and 1-Diphenylphosphano-2-(2-pyridino)ethane-N-arylsulfinylamine Nickel(0) ComplexesSynthesis and properties of the bis(diphenylphosphano)alkane-N-phenyl-sulfinylamine-nickel(0) complexes [Ni{Ph2P(CH2)nPPh2}(PhNSO)] (n = 2 dppe, n = 3 dppp, n = 4 dppb) as well as of the 1-(diphenylphosphano)-2-(2-pyridino)ethane nickel(0) complexes [Ni(dpppe)2], [Ni(dpppe)(p-TolNSO)] and [Ni(dpppe)(PPh3)2] are described.These compounds have been characterized by i. r. and 31P n.m.r. spectroscopy. The N-arylsulfinylamine ligands are η2-(N, S)-side on coordinated.

Notizen: Synthese und Eigenschaften der Bis(diphenylphosphano)alkan-N-Phenylsulfinylamin-Nickel(0)-Komplexe [Ni{Ph2P(CH2)nPPh2}(PhNSO)] (n = 2 dppe, n = 3 dppp, n = 4 dppb) sowie der 1-Diphenylphosphano-2-(2-pyridino)ethan-Nickel(0)-Komplexe [Ni(dpppe)2], [Ni(dpppe)(p-TolNSO)] und [Ni(dpppe)(PPh3)2] werden beschrieben.Die Charakterisierung der genannten Verbindungen erfolgte mit Hilfe der IR- und 31P-NMR-Spektroskopie. Die N-Arylsulfinylamin-Liganden sind η2-(N, S)-side on koordiniert.

Zusätzliches Material: 1 Ill.