Materials Literature
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The use of nanometer-sized gold particles as templates for the synthesis of hollow poly(pyrrole), poly( N -methylpyrrole), and poly(3-methylthiophene) is described in this paper. Diffusion coefficients of small molecules through the capsule shell were found to vary by almost 3 orders of magnitude depending on the poly…
Zinc(II) and cadmium(II) coordination networks with m -pyridinecarboxylate bridging ligands, Zn(nicotinate) 2, 1, Cd(nicotinate) 2, 2, Cd{3-[2-(4-pyridyl)ethenyl]benzoate} 2, 3, Zn 4 {3-[2-(4-pyridyl)ethenyl]benzoate} 8 ·{3-[2-(4-pyridyl)ethenyl]benzoic acid}·(H 2 O), 4, Zn{4-[2-(3-pyridyl)ethenyl]benzoate} 2 ·H 2 O,…
We present a method for obtaining well-localized Wannier-like functions (WFs) for energy bands that are attached to or mixed with other bands. The present scheme removes the limitation of the usual maximally-localized WFs method (N. Marzari and D. Vanderbilt, Phys. Rev. B 56, 12847 (1997)) that the bands of interest s…
Rhodium auf einem Titanoxid/Siliciumoxid-Träger wird durch 1 modelliert, das aus [{Cp*TiMe(μ-O2SiPh2)}2] 2 und [{Rh(OH)(cod)}2] hergestellt werden konnte. 2 und sein dreifach verbrücktes Derivat [Cp*Ti(μ-O2SiPh2)3TiCp*] 3 können als molekulare Modelle des Titanoxid/Siliciumoxid-Systems angesehen werden. Die Verbindung…
1,2-Diaminoethane (en) and FeCl3 give (enH2) [FeCl5(H2O)] (1) in concentrated HCl, extending the aquapentachloroferrate(III) series. For 1: C2H12N2Cl5OFe, orthorhombic, P2(1)2(1)2(1), a = 14.531(6) A, b = 10.772(4) A, c = 6.888(2) A, Z = 4. Diazabicyclo[2.2.2]octane dihydrochloride (DABCO-2HCl) and FeCl3 in concentrat…
Growth rate and effects of doping sodium in potassium dihydrogen phosphate (KDP) solution have been studied in crystals grown by solution evaporation and slow cooling methods. The crystals were grown in a KDP solution doped with different concentrations of sodium ions. The rates of growth along the thickness and width…
1,3,5-tripyrrolidinobenzene is the first example of an aromatic amine that forms σ dimers during oxidation/reduction cycles [Eq. (1); X−=ClO4−], and thus turns out to be an efficient molecular switch. Surprisingly, such σ dimers are relatively stable intermediates during the formation of conjugated oligomers and polym…
Abstract The stability of poly(phenylacetylene)s in solution was systematically studied. Cis–transoidal poly(phenylacetylene) prepared with a Rh catalyst readily underwent autoxidative degradation into oligomers, whereas a W‐based polymer with a trans‐rich geometrical structure degraded slowly under similar conditions…
The excitonic luminescence of a highly ordered single conjugated polymer chain is studied by microphotoluminescence. At $T\ensuremath{\le}10\mathrm{K}$ it consists of a single Lorentzian line. The linewidth increases linearly with $T$ between 6 and 60 K, from $350\ensuremath{\mu}\mathrm{eV}$ at 6 K, indicating a pure…
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…