Materials Literature
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Mindestens drei Phthalocyaninylreste können Phosphoniumionen enthalten, wie es z. B. im Salz 1 der Fall ist. Solche Phosphoniumionen sind durch eine Pd-katalysierte Reaktion zugänglich, bei der Phenyl- gegen Phthalocyaninylreste ausgetauscht werden. Erste Untersuchungen an 1 und verwandten Salzen bezüglich ihrer nicht…
„Unschuldiges“ Verhalten eines typischen „nichtunschuldigen“ Liganden wurde für den ersten strukturell charakterisierten diskreten Metallkomplex mit vierfach verbrückendem TCNQ festgestellt. Die Koordination von vier [Re(CO)3(bpy)]+-Einheiten (siehe Bild; C: schwarz, N: grün, O: blau, Re: rot) erleichtert die Reduktio…
Ab initio MO calculations at the CCSD(T)/6-311++G(2df,p)//MP2/6-311++G** level have been carried out to determine the reaction energies and Gibbs energies of the homolytic dissociation of the S-S bonds in the chainlike sulfanes H2Sn (n = 2-4). Good agreement with the experimental data is observed. At the same level of…
Magnetic colloidal particles were prepared by a coprecipitation method. The particles were composed of nanometer-sized superparamagnetic Fe(3)O(4) particles stabilized by lauric acid. Then, magnetic agar gel beads were produced by a water-in-oil emulsification method using a mixture of agar solution and the magnetic c…
We report the occurrence of a reentrant twist grain boundary phase, which we designate as Re- ${\mathrm{TGB}}_{A}$. Microscopic observations on a nonsymmetric dimer showed the phase sequence Iso-- ${N}^{*}$-- ${\mathrm{TGB}}_{A}$--Sm- $A$--Re-- ${\mathrm{TGB}}_{A}$-- ${\mathrm{TGB}}_{{C}^{*}}$. Here ${N}^{*}$ and Sm-…
Bacterial cellulose (BC) production was carried out in a batch cultivation of Acetobacter xylinum in a 50-L internal loop airlift reactor by addition of water-soluble polysaccharides into the medium. When 0.1% (w/w) agar was added, BC production reached 8.7 g/L compared with 6.3 g/L in the control, and duration of the…
Abstract Fluorene‐based polymers containing various fluorinated benzene (fluorobenzene, p ‐difluorobenzene, and tetrafluorobenzene) moieties were synthesized. In addition, perfluorooctylation of poly‐[(9,9‐dioctylfluorene‐2,7‐diyl)‐ co ‐(fluorene‐2,7‐diyl)] was carried out to afford fluorene‐based polymers with perflu…
A series of iron-containing zeolitic materials, prepared by different procedures, have been tested as heterogeneous catalysts for the oxidation of phenolic solutions with hydrogen peroxide under mild conditions. Fe-TS-1 catalysts were synthesized through hydrothermal crystallization of wetness-impregnated Fe 2 O 3 −Ti…
Abstract Triblock copolymers in midblock‐selective solvents can form physical gels. However, at low triblock contents (near the percolation threshold), the bridging of chains between micelles can lead to macrophase separation. Adding a styrene–isoprene diblock to a styrene–isoprene–styrene triblock copolymer in squala…
The study of a homologous series of precursors to bridged polysilsesquioxanes has uncovered striking discontinuities in gelation behavior. An investigation of the chemistry during the early stages of the polymerization has provided a molecular basis for these observations. Monomers containing from one to four bridging…
An electroless plating method was used to deposit Au nanotubules within the pores of track-etched polycarbonate template membranes. The effect of nanotubule inside diameter on rate and selectivity of protein transport was investigated for three proteins: lysozyme (Lys), bovine serum albumin (BSA), and β-lactoglobulin…
Clinically relevant relaxivity enhancement of a magnetic resonance imaging (MRI) contrast agent has been achieved by using prodrug Gd3+ complexes (see picture, DTPA=diethylenetriaminepentaaceto). Enzymatic cleavage of lysine residues from the prodrug exposes a group that has a high affinity to human serum albumin and…
The diboride materials MB2 (M = Mg, Be, Pb, etc.) are discussed on the basis of the 3D Josephson junction array (JJA) model due to Kawabata-Shenoy-Bishop, in terms of the B-B layers in the diborides analogous to the Cu-O ones in the cuprates. We propose a possibility of superconducting materials with the MgB2-type str…
Bis(LeuOH) (1a), bis-(ValOH) (2a) and bis(PhgOH) (5a) (Phg denotes (R)-phenylglycine) oxalyl amides are efficient low molecular weight organic gelators of various organic solvents and their mixtures as well as water, water/DMSO, and water/DMF mixtures. The organisational motifs in aqueous gels are dominated primarily…
The structures of molten MgCl 2 and ZnCl 2 have been modelled using the reverse Monte Carlo method, based on neutron and x-ray diffraction data. We show that, although the structures are similar in terms of two-body correlations (e.g. partial radial distribution functions, average coordination numbers), there are impo…
Relativistic calculations of the parameters β,γ and δ of the photoelectron angular distribution have been carried out using the quadrupole approximation for a number of atoms at photoelectron energies up to 10 000 eV. The calculations have been performed using the Dirac-Fock (DF) atomic model, the exchange interaction…
AIMS: The study investigated the physiology of Amaricoccus kaplicensis to determine whether it could outcompete polyphosphate accumulating bacteria in activated sludge systems removing phosphorus, by preferentially assimilating substrates in the anaerobic stages of these processes. METHODS AND RESULTS: The storage pro…
We analyse the possibilities of elastic matching and effective internal stress relief at the coexistence of polar phases in ferroelectric PbZr 1- x Ti x O 3 compositions close to the morphotropic phase boundary. The important role of the polydomain (twinned) monoclinic phase in this stress relief over wide concentrati…
Abstract A novel, fast, and simple synthetic procedure for polycarbamate/urea dendrimers, based on an AB–CD 2 coupling strategy, is presented. The reactivity difference of the two isocyanate functionalities of the AB building block allows the construction of these dendrimers without the necessity of activation or depr…
We propose that the behaviour of asymmetric binary fluid mixtures with a large class of attractive or repulsive interparticle interactions can be understood by mapping onto effective non-additive hard-sphere models. The latter are best analysed in terms of their underlying depletion potentials which can be exactly sca…