TY - JOUR A1 - Ondrus, V. A1 - Meier, R.J. A1 - Klein, C. A1 - Henne, U. A1 - Schäferling, Michael A1 - Beifuss, U. T1 - Europium 1,3-di(thienyl)propane-1,3-diones with outstanding properties for temperature sensing N2 - The synthesis of novel Eu complexes with 1,3-di(thienyl)propane-1,3-diones as ligands as well as their luminescence properties in different polymers are reported. The new temperature sensitive paints (TSPs) exhibit not only exceptional high temperature sensitivity over a wide range of temperatures but are also characterized by negligible pressure sensitivity and marked photostability. This is why they are outstandingly suitable for applications, e.g. in aerodynamics and hydrodynamics. KW - Temperature sensitive paint KW - Eu diketonate KW - Luminescence KW - Intensity method KW - Lifetime method PY - 2015 DO - https://doi.org/10.1016/j.sna.2015.07.023 SN - 0924-4247 VL - 233 SP - 434 EP - 441 PB - Elsevier Science CY - Amsterdam [u.a.] AN - OPUS4-33856 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Wang, X.-d. A1 - Meier, R.J. A1 - Schäferling, Michael A1 - Bange, S. A1 - Lupton, J.M. A1 - Sperber, M. A1 - Wegener, J. A1 - Ondrus, V. A1 - Beifuss, U. A1 - Henne, U. A1 - Klein, C. A1 - Wolfbeis, Otto S. T1 - Two-photon excitation temperature nanosensors based on a conjugated fluorescent polymer doped with an Europium probe N2 - A strongly fluorescent organic semiconducting polymer doped with a highly temperature dependent fluorescent europium(III) complex is converted into a nanosized material that is capable of optically sensing temperature (T) in the range from 0 to 50 °C via two-photon excitation at 720 nm. The nanosensors are prepared from a blue-fluorescent polyfluorene that acts as both a lightharvesting antenna (to capture two-photon energy) and an energy donor in a fluorescence resonance energy transfer (FRET) system. The photonic energy absorbed by the polymer is transferred to the T-sensitive red-luminescent europium complex contained in the nanoparticles. The close spatial proximity of the donor and the acceptor warrants efficient FRET. A poly(ethylene glycol)- co-poly(propylene oxide) block copolymer is also added to render the particles biocompatible. It is shown that T can be calculated from a) the intensity of the luminescence of the europium complex, b) the ratio of the intensities of the red and blue luminescence, or c) the T-dependent luminescence lifetime of the Eu(III) complex. KW - Optical sensor KW - Temperature sensor KW - Nanosensor KW - FRET system PY - 2016 UR - http://onlinelibrary.wiley.com/doi/10.1002/adom.201600601/abstract DO - https://doi.org/10.1002/adom.201600601 SN - 2195-1071 VL - 4 IS - 11 SP - 1854 EP - 1859 PB - Wiley-VCH CY - Weinheim AN - OPUS4-38737 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Roduner, E. A1 - Kaim, W. A1 - Sarkar, B. A1 - Urlacher, V.B. A1 - Pleiss, J. A1 - Gläser, R. A1 - Einicke, W.-D. A1 - Sprenger, G.A. A1 - Beifuß, U. A1 - Klemm, E. A1 - Liebner, Christian A1 - Hieronymus, Hartmut A1 - Hsu, S.-F. A1 - Plietker, B. A1 - Laschat, s. T1 - Selective catalytic oxidation of C-H bonds with molecular oxygen N2 - Although catalytic reductions, cross-couplings, metathesis, and oxidation of C=C double bonds are well established, the corresponding catalytic hydroxylations of C–H bonds in alkanes, arenes, or benzylic (allylic) positions, particularly with O2, the cheapest, 'greenest', and most abundant oxidant, are severely lacking. Certainly, some promising examples in homogenous and heterogenous catalysis exist, as well as enzymes that can perform catalytic aerobic oxidations on various substrates, but these have never achieved an industrial-scale, owing to a low space-time-yield and poor stability. This review illustrates recent advances in aerobic oxidation catalysis by discussing selected examples, and aims to stimulate further exciting work in this area. Theoretical work on catalyst precursors, resting states, and elementary steps, as well as model reactions complemented by spectroscopic studies provide detailed insight into the molecular mechanisms of oxidation catalyses and pave the way for preparative applications. However, O2 also poses a safety hazard, especially when used for large scale reactions, therefore sophisticated methodologies have been developed to minimize these risks and to allow convenient transfer onto industrial scale. KW - Coupling reactions KW - Feedstocks KW - Hydroxylation KW - Molecular oxygen KW - Oxidation KW - Catalytic oxidation KW - Micro reactor KW - Explosion KW - Safety PY - 2013 DO - https://doi.org/10.1002/cctc.201200266 SN - 1867-3880 VL - 5 IS - 1 SP - 82 EP - 112 PB - Wiley-VCH CY - Weinheim AN - OPUS4-27637 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -