2018-3-27, Burlakov, Vladimir V., Bogdanov, Vyacheslav S., Arndt, Perdita, Spannenberg, Anke, Rosenthal, Uwe, Beweries, Torsten, Shur, Vladimir B.

The crystal structure of the title zwitterionic zirconocene complex containing a furan­one unit, [AlZr(C10H15)2(C4H9)3(C9H18O2Si2)], is reported. On reacting a zircona­furan­one with two equivalents of HAl(i-Bu)2, disproportionation of the Lewis acid results in the formation of a triiso­butyl­aluminium fragment, Al(i-Bu)3, which coordinates to the exocyclic carbonyl O atom of the zircona­furan­one ring. Single-crystal X-ray diffraction reveals that the zircona­furan­one ring remains intact with coordination of the aluminium to the exocyclic O atom. One of the i-butyl groups is disordered over two sets of sites, with an occupancy ratio of 0.731 (3):0.269 (3).

2017, Braig, Christoph, Sokolov, Andrey, Wilks, Regan G., Kozina, Xeniya, Kunze, Thomas, Bjeoumikhova, Sempfira, Thiel, Markus, Erko, Alexei, Bär, Marcus

A collimating polycapillary half lens, traditionally used in the medium and hard X-ray band, is operated at a photon energy of 36 eV for the first time. While the transmission still exceeds 50%, the measured and simulated spatial resolution and angular divergence approach 0.4 mm or less and at most 20 mrad, respectively. This unexpected, superior performance of the polycapillary optic in the extreme Ultraviolet could enable the design of an e cient, versatile and compact spectrometer for inverse photoemission spectroscopy (IPES): Its wavelength-dispersive component, a customized reflection zone plate, can maintain an energy resolution of 0.3 eV, whereas the sensitivity may be enhanced by more than one order of magnitude, compared to conventional spectrometers. Furthermore, the overall length of 0.9 m would allow for an eased alignment and evacuation. We see a significant potential for numerous polycapillary-based XUV / soft X-ray instruments in the future, in particular after further optimization for this long wavelength regime.