A Ditopic Phosphane-decorated Benzenedithiol as Scaffold for Di- and Trinuclear Complexes of Group-10 Metals and Gold

The ability of 3-(diphenylphosphinomethyl)-benzene-1,2-dithiol (pbdtH(2)) to act as ditopic ligand was probed in reactions with selected group-10-metal complexes. Reactions with [(cod)PdCl2] afforded a mixture of products identified as [Pd(pbdtH)(2)], [Pd-2(mu(2)-pbdt)(2)] and [Pd-3(mu(2)-pbdt)(2)Cl-2]. The polynuclear complexes could be isolated after suitably adjusting the reaction conditions, and heating of a mixture in a microwave reactor effected partial conversion into a further complex [Pd-3(mu(2)-pbdt)(3)]. Reaction of pbdtH(2) with [Ni(H2O)(6)Cl-2] gave rise to a complex [Ni-2(mu(2)-pbdt)(2)], which was shown to undergo two reversible 1e(-)-reduction steps. Reaction of [Pd(pbdtH)(2)] with [Au(PPh3)Cl] afforded heterotrinuclear [PdAu2(mu(2)-pbdt)(2)(PPh3)]. All complexes were characterized by analytical, spectroscopic and single-crystal X-ray diffraction studies. Their molecular structures confirm the ability of the pbdt(2-) unit to support simultaneous P,S- and S,S-chelating coordination to two metal centers.Peer reviewe

Bemessung im Grenzbereich - Potenzial von Großversuchen für eine effiziente Auslegung

Support structures for wind energy converters have become serial products. More than 1 350 wind turbines are installed offshore only in the German North and Baltic Sea. Structures of large dimensions being highly dynamically loaded and located in a harsh offshore environment are challenging and moving at the limit of design standards. However, serious damages are rare. This is obviously positive, but meaning on the other side that there might be potential for dimensioning structures more efficiently. Driven by high cost pressure these reserves have to be quantified and potentials have to be demonstrated. Large scale experiments in particular offer possibilities for a more individual design of structures. With the objective of validating and optimising design approaches the Test Center for Support Structures in Hannover was founded in 2014. Here, large scale components and structures can be analysed and tested. This paper summarises the findings of research projects in the recent past. The regarded projects deal with the development of new tower concepts in steel for large hub heights, with the fatigue of thick‐walled welded structures considering special aspects of corrosion, and with the development of a structural health monitoring system in order to ensure the reliability of grouted connections