Materials Literature
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The electronic structure of artificial Mn atom arrays on Ag(111) is characterized in detail with scanning tunnelling spectroscopy and spectroscopic imaging at low temperature. We demonstrate the degree to which variations in geometry may be used to control spatial and spectral distributions of surface state electrons…
Catalysts based on Sn–Cr composite oxide (SnCr) and modified with sulfate or a small amount of Pd were prepared and studied for CH4 deep oxidation. XRD suggests that a solid solution may be formed between Sn and Cr. As a result, the thermal stability of SnCr catalyst is significantly enhanced, and more active oxygen s…
Phthalocyanines solubilised by either 8 or 16 aryloxy or haloaryloxy groups are described. A series of phthalocyanine derivatives were prepared containing indium. 1,2-Dinitriles and the corresponding diiminoisoindolines were used as precursors. A naphthalocyanine metallated with indium and solubilised with four tert-b…
A simple interferometric technique has been developed to sequentially measure the piezoelectric and electro-optic (EO) coefficient of the poled polymer films. This technique, similar to the Michelson interferometer, is based on compensating the change of the optical path due to the piezoelectric and electric-optic eff…
Seven new complexes of nickel(II), derived from azido, thiocyanato and nitrito bridging ligands and N,N,N′-trimethylethylenediamine (N,N,N′-Me3en) as blocking ligand, were synthesised and characterised; four of them are one-dimensional compounds: [Ni(μ1, 3-N3)(N,N,N′-Me3en)2]n(ClO4)n1, [Ni(μ1, 3-N3)(N,N,N′-Me3en)2]n(P…
Thermal oxidation of the zwitterionic form of two photochromic spirooxazines: 1,3-dihydro-1,3,3-trimethylspiro(2H-indole-2,3′-[3H]naphth[2,1-b]-[1,4]oxazine) (1) and 1,3-dihydro-1,3,3-trimethylspiro(2H-indole-2,3′-[3H]phenanthr[9,10-b]-[1,4]oxazine) (2) has been studied in the presence of silver ions in anaerobic cond…
Selbstorganisation in wässrigen Systemen indirekt untersucht: Die wässrige Phase wird durch einen Sol-Gel-Prozess auf Kieselgelbasis verfestigt, wobei das supramolekulare Aggregat 1:1 in der festen Kieselgelmatrix abgebildet wird. Am Modellsystem Cyclodextrine konnte gezeigt werden, dass die Cyclodextrinmoleküle „wurm…
We have studied vibrational properties of Ba0.5Sr0.5TiO3 thin films grown by pulsed laser deposition on SrTiO3 and LaAlO3 substrates with SrRuO3 buffer layers by Raman spectroscopy over the temperature range from 5 to 300 K. The soft phonon modes were observed. The temperature dependence of the soft phonon frequency a…
Electrical depolarization has been observed in lanthanum-modified lead titanate ferroelectric thin films stressed by nanoindentation. A spherical metallic indenter was used as a top electrode to locally pole the films and then to measure the depolarization current intensity. The current intensity had distinctive maxim…
The series of isotypic compounds V8Ga41 --> V8Ga36.9Zn4.1 --> Cr8Ga29.5Zn11.2 --> Mn8Ga27.4Zn13.6 with the V8Ga41 structure type (space group R3, Z = 3) was prepared and structurally characterised by X-ray diffraction experiments (V8Ga41: a 13.9351(5), 14.8828(12); V8Ga36.9Zn4.1: a = 13.9244(7), c = 14.8660(9): Cr8Ga2…
Fluoreszierende Flüssigkristalle: Wasserstoffbrücken zwischen Benzoesäuren und Azaaren-Rezeptorgruppen von Diazadibenzoperylen-Fluorophoren induzieren columnare flüssigkristalline Mesophasen, die stark fluoreszieren. Die Struktur eines auf diese Weise gebildeten mesogenen Übermoleküls ist im Vordergrund einer polarisa…
Good ferroelectric properties have previously been reported for both the (1−x)SrBi2Ti2O9–xBi3TiNbO9 bulk ceramics and thin films. In this work, x-ray diffraction and Raman scattering were used to investigate the effect of the incorporation of Bi3TiNbO9 into SrBi2Ta2O9 bulk ceramics and thin films. A better crystalliza…
A higher-order nonlinear dielectric microscopy technique with higher lateral resolution than conventional nonlinear dielectric imaging is investigated. The proposed scheme involves the measurement of higher-order nonlinear dielectric constants, with sensitivity to the first 0.75 nm in depth for LiNbO3 substrate surfac…
The flexible partially inverted structure of an 18-π-electron porphyrin-(1.1.1.1)-like framework is found for 21,23-ditelluraporphyrin (see structure). The dihedral angle between the plane of meso-carbon atoms and the inverted tellurophene plane in the solid state is 123.0(2)°, while in solution the porphyrin molecule…
Fluorescent liquid crystals: Hydrogen bonding of benzoic acids to azaaromatic receptor groups of diazadibenzoperylene fluorophores induces columnar liquid crystalline mesophases which are highly fluorescent. The structure of a mesogenic supermolecule generated in this way is shown on a background of a polarizing micro…
The local modification of the electronic states of highly oriented pyrolytic graphite (HOPG) surfaces using highly charged ion (HCI) irradiation has been demonstrated as a promising technique in the design of nanoscale materials. The high potential energy of HCI and subsequent surface treatment by either electron inje…
Metallofullerene nanotube peapods were prepared by introducing Dy@C82 into the interior space of single-walled carbon nanotubes. Transport measurements show that the Dy@C82 molecules function as electron donors and transfer charge to the carbon nanotube host. The amount of charge transferred varies with the temperatur…
1H NMR line-shape analysis and magnetisation-transfer experiments at variable temperature and pressure have been used to elucidate the solution dynamics of both M and m isomers of three [Eu(dota-tetraamide)(H2O)]3+ complexes. The direct 1H NMR observation of the bound water signal allows the water-exchange rates on ea…
The acid-catalyzed condensation of pyrrole and 2,5-bis(p-tolylhydroxymethyl)thiophene yields two novel giant heteroporphyrins: 5,10,15,20,25,30, 35,40-octa(p-tolyl)-41,43,45,47-tetrathia[36]octaphyrin(1.1.1.1.1.1.1.1) (S4OP) and 5,10,15,20,25,30,35,40-octa(p-tolyl)-dihydro-41,43,45,47-tetrathia[38]octaphyrin(1.1.1.1.1…
Embedded capacitor technology can improve electrical performance and reduce assembly cost compared with traditional discrete capacitor technology. Polymer–ceramic composites have been of great interest as embedded capacitor material because they combine the processability of polymers with the desired electrical proper…