Materials Literature
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Der photo- und redoxaktive Diazaligand 1 und sein zweifach alkyliertes Derivat 2 wurden ausgehend von Perylenbisimiden erhalten. Die Eignung von 1 zum Aufbau supramolekularer Architekturen wurde anhand des Bindungsverhaltens gegenüber Carbonsäuren, Zinkporphyrinen und Metallionen belegt.
The oxidative polymerisation of the complex2,3-dimethyl-N,N'-bis-(salicylidene)butane-2,3-diaminatonick-el(II), [Ni(saltMe)], was monitored by the electrochemical quartz microbalance (EQCM) and crystal impedance techniques. Polymerisation efficiency was maintained throughout deposition of a film, which behaved rigidly…
The dielectric behavior of SrTiO3 single crystals under high dc electric field (up to 50 kV/cm) is reported in this letter. The rounded dielectric constant peaks are induced by the application of dc bias, and the corresponding dielectric losses are observed. The results show that dielectric loss under dc bias consists…
The “dynamic spatial demand” of Fréchet-type dendrons is compared with that of “conventional” building blocks by evaluation of the deslipping behavior of dendritic rotaxanes (see picture). This method leads to a ranking list of the size of voluminous building blocks, which will be useful for the rating of steric effec…
Der vollständig ladungsgetrennte Zustand PH2+-[Ir]-PAu− wird mit 50 % Effizienz nach der Anregung der freien Porphyrinbase PH2 in 1 gebildet, indem sich sukzessive Elektronentransfers zur Bis(terpyridin)iridium-Einheit [Ir] und zum Goldporphyrin PAu anschließen. Die Desaktivierung dieses Zustands erfolgt quantitativ ü…
A series of extended tetrathiafulvalene (TTF) derivatives bearing one or two 1,4-dithiafulven-6-yl substituents has been prepared. The new compounds present remarkable electrochemical singularities compared with other TTF derivatives, which are strongly affected by the nature of the substitution on the lateral heteroc…
Resonant x-ray diffraction was carried out at the Se K edge in thick free-standing films of a selenophene liquid crystalline material, revealing detail of the structure of the ferro-, ferri-, and antiferroelectric phases. The ferrielectric phase was shown to have a three-layer superlattice. Moreover, the structure of…
The mesoporous high surface area MCM-41 material was synthesized and used as a support material for the preparation of Co/MCM-41 samples. Co 2 (CO) 8 was deposited from the gas phase onto the MCM-41 surface in a fluidized bed reactor. Pure MCM-41 and Co/MCM-41 samples were characterized by various spectroscopic and an…
Eine zeolithartige offene Gerüststruktur, die in zwei zueinander senkrechten Richtungen mit weiten Kanälen durchsetzt ist – dies ist das Kennzeichen einer aus Metalloporphyrin-Bausteinen erhaltenen faszinierenden supramolekularen Anordnung (siehe Bild). Nur 42 % des Kristallvolumens sind ausgefüllt, sodass das Gerüst…
Upon irradiation, reversible modulation of triple-helix formation occurs. A model double helix is formed from oligo(T) and oligo(dA). In the presence of a second oligo(T) modified with an azobenzene moiety, the binding strength of the triple helix is dependent upon the configuration of the azobenzene, a feature contro…
A fully charge-separated state PH2+-[Ir]-PAu− is formed with 50 % efficiency following excitation of the free-base porphyrin component PH2 of 1 by successive electron transfers to the iridium bis(terpyridine) moiety [Ir] and the gold porphyrin PAu. Its deactivation proceeds quantitatively through the triplet state 3PH…
A uniquely structured molecular solid composed of pillared bilayers of metalloporphyrin building blocks has been formulated. It consists of a single three-dimensional multicomponent supramolecular framework, resembling a zeolite, which accounts for only 42 % of the crystal volume (see picture). The spacious, open gall…
Highly conductive perovskite La0.5Sr0.5CoO3 thin films were grown on (012) LaAlO3 by pulsed-laser deposition at different substrate temperatures. Magnetoresistance (MR) measurements show only a negative effect for the films grown at a temperature of 800 °C. However, a positive MR effect was found for the films grown a…
A series of extended tetrathiafulvalene (TTF) derivatives bearing one or two 1,4-dithiafulven-6-yl substitutents has been prepared. The new compounds present remarkable electrochemical singularities compared with other TTF derivatives, which are strongly affected by the nature of the substitution on the lateral hetero…
A series of polyoxomolybdate-incorporated organometallic complexes has been obtained by reaction of [MBr(CO)5] or solvated M(CO)3+ ions (M = Mn or Br) with (nBu4N)2[Mo2O7] in methanol, sometimes in the presence of triols of the type RC(CH2OH)3 (R = Me or CH2OH). Their molecular structures are related to those of previ…
A series of polyoxomolybdate-incorporated organometallic complexes has been obtained by reaction of [MBr(CO)5] or solvated M(CO)3+ ions (M = Mn or Br) with (nBu4N)2[Mo2O7] in methanol, sometimes in the presence of triols of the type RC(CH2OH)3 (R = Me or CH2OH). Their molecular structures are related to those of previ…
Purified Ralstonia eutropha polyhydroxybutyrate (PHB) synthase from recombinant cells can exist as monomer and dimer. The polymerization reaction catalyzed by this enzyme displays a lag phase, which causes difficulties for kinetic and mechanistic characterization of the enzymatic polymerization reaction. In this study…
The first direct in situ observations of the production and microsegregation of radiolytic interstitial oxygen resulting from electron beam irradiation of crystal and amorphous oxygen deficient ${\mathrm{SiO}}_{2}$ polymorphs has been made using cathodoluminescence (CL) microanalysis (spectroscopy and microscopy). Pre…
We report conclusive high resolution small angle x-ray scattering evidence that long DNA fragments form an untwisted line hexatic phase between the cholesteric and the crystalline phases. The line hexatic phase is a liquid-crystalline phase with long-range hexagonal bond-orientational order, long-range nematic order,…
The photo- and redox-active diaza ligand 1 and its doubly alkylated derivative 2 were obtained from perylene bisimides. The suitability of 1 for obtaining supramolecular architectures was confirmed by binding studies with carboxylic acids, zinc porphyrins, and metal ions.