Synthese und reaktivität von dienylmetall-komplexen: XXIII. Cyclopentadienylnickel-komplexe mit amin-liganden

Stable [C₅H₅Ni(NN)]BF₄ complexes are formed by treatment of [C₅H₅Ni(SR₂)₂]BF₄ (R = CH₃) with some 1,2-diaminoalkylidenes NN; Chemical and spectroscopic properties are reported.     

Liquid crystalline side group polymers with azo-chromophores and fluorinated tails of varying length

A series of side group liquid crystalline polymethacrylates with 4'-(1H,1H-perfluoroalkoxy)-azobenzene mesogenic units was synthesized and characterized by differential scanning calorimetry, polarizing optical microscopy and X-ray diffraction methods depending on the tail length. The phase behaviour is discussed as a function of the length of the tail groups. Very high clearing temperatures up to 290°C were observed for the polymers with long tail groups.     

Spectroscopic Characterization of Open-Shell Cations: Emission and Laser Excitation spectra of Rotationally Cooled CH3(CC)2X+, X = Cl,Br

Gas phase emission and laser excitation spectra of the òE?X?²E (Σ = +½, ?½) transition of rotationally/vibrationally cooled 1-chloro- and 1-bromo-1,3-pentadiyne cations have been obtained. The emission was excited by electron impact on a seeded helium supersonic free jet and the fluorescence by laser excitation of cations produced by Penning ionization and collisional relaxation. From these two sets of data the origin bands of the spin-orbit systems are located and for the bromo species this leads to better values of the spin-orbit splitttings in the two electronic states and of the first adiabatic ionization energy. The vibrational frequencies of many of the fundamentals of these cations in the X?²E and òE states have been obtained to within ±2 cm^?1.     

Zur Fraktionierung von Polymeren mit entmischenden Flüssigkeiten

Ohne Zusammenfassung     

Über orthogonalisierbare nicht-archimedische Banachräume

Ohne Zusammenfassung