Materials Literature
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Merocyanin-Farbstoffe mit einem großen Dipolmoment wie 1 aggregieren in Lösung zu Dimeren, in denen die Dipolmomente antiparallel orientiert sind. Durch Variation der Substituenten und die Untersuchung der lösungsmittelabhängigen Bindungseigenschaften wurde gezeigt, dass die Aggregation auf starke elektrostatische Dip…
The use of copper(I) halides as a preparative tool is discussed with respect to the synthesis of adduct compounds with new polymeric and oligomeric main group molecules. By using this approach new polymers of main group elements--some of which have been predicted by theoretical investigations--can be obtained in a cry…
Two very different complexes are isolated depending on whether the macrocycle L is assembled in the presence of a copper(I) template or whether a lead–macrocycle complex is subjected to transmetalation with copper(I). In the former case a tetracopper(I) grid complex is obtained, whereas in the latter the first example…
A specific two-dimensional tiling model, composed of the so-called Wang tiles has been studied at finite temperature using Monte Carlo numerical simulations. In the absence of any thermal bath the Wang tiles provide the opportunity of building a very large number of non-periodic tilings. We can construct a local Hamil…
We report here the first 77 Se nuclear magnetic resonance (NMR) and XRD study of the dynamical and structural behavior of selenate and selenite in hydrotalcite-like compounds (HT-SeO 4 and HT-SeO 3 ). The swelling properties and dynamical behavior of the anions in HT-SeO 4 and HT-SeO 3 are very different, and the resu…
The synthesis of liquid crystalline 3,4,5-tris(11-methacryloylundecyl-1-oxybenzyloxy)benzoic acid, 2-methyl-(1,4,7,10,13-pentaoxacyclopentadecane)-3,4,5-tris[4-(11-methacryloylundecyl-1-oxy)benzyloxy] benzoate and its 1:1 complex with sodium triflate is described. The observed mesophases were identified, by polarized…
New [3]- and [4]-dendralenes bearing electron-donor 1,3-dithiole and ferrocene substituents have been synthesised. Compounds 8, 15 and 17 have been characterised by single-crystal X-ray diffraction. Two of the dithiole rings of 8 are conjugated (dihedral angle 9 degrees), while the third dithiole ring is almost orthog…
Highly dipolar merocyanine dyes such as 1 form strong dimer aggregates with an antiparallel orientation of their dipole moments in solution. Substituent variations and solvent-dependent binding studies have shown that the aggregation is driven by electrostatic dipole–dipole interactions and that the dyes are prevented…
Chemical (vapors of formaldehyde), physical (temperature, UV and gamma radiation), and aging treatments were applied to wheat gluten films. Changes in film mechanical properties, water vapor permeability, solubility, and color coordinates were investigated. An aging of 360 h led to a 75 and 314% increase in tensile st…
The structure of a solid has been studied by the molecular dynamics technique upon transition from the amorphous state to the crystalline state. The influence of initial conditions in the simulation of an amorphous sample and the temperature of its heating on the resulting structure is examined. It is found that struc…
A complete spectrum criterion and a next nearest neighbor model are proposed. Research indicates: 1) Using this criterion can remove the long existing puzzle that different parameters produce different bond lengths. The criterion greatly improve the reliability of optical method for determining the Mn 2+ -F - distance…
The conformational preferences of N-[3-(acetylamino)-2-methyltrimethylene] acetamide and N-[5-(acetylamino)-(S)-2-methylpentamethylene]acetamide were investigated using ab initio computational methods. These are model compounds of a number of substituted nylons-m,n containing a methyl side group in the diamine unit. A…
Abstract In the present paper a general analytic expression has been obtained and confirmed by a computer simulation which links the surface roughness of an object under study in an emission electron microscope and it's resolution. A quantitative derivation was made for the model case when there is a step on the objec…
In this communication we present the results obtained from a study on the effect of thermal treatments of chitosan films with different molecular weights, but with a similar acetilation degree, carried out by microhardness. It was found that the hardness of films prepared from both type of chitosan is similar, of appr…
The interfacial chemistry of an Al/Mg/PET sample, prepared by thermally evaporating first Mg and then Al on to a polyethyleneterephthalate (PET) film, was studied by X-ray photoelectron spectroscopy (XPS). The Mg/PET system showed two types of Mg species, namely an O–Mg–C complex, from reaction with the carbonyl group…
Copper(II) trifluoroacetate with three coordinated water molecules and two dioxane molecules (1) crystallized as a linear chain surrounded by a net of hydrogen bonds to the dioxane and trifluoroacetate. This complex [Cu(H2O)3(OOC-CF3) 2]·2(C4H8O 2) crysta
The kinetics of the isothermal eutectoid transformation in a eutectoid Au–39 at.-%In alloy has been studied in the temperature range 393–473 K. The maximum extent of growth of the eutectoid colonies and the lamellar spacing were determined through optical and scanning electron microscopy. The analysis of the kinetic d…
The light rare earths, particularly cerium compounds, are becoming more and more important recently. The preparation method of Ce(OH)4 · xH2O through transformation between cerium compounds was investigated. The process is compared with the direct routine by reacting Ce(III) with sodium hydroxide and hydrogen peroxide…
The complex Cu(hfac)2(DMF)2 (where hfac = the anion of hexafluoropentanedione and DMF = dimethylformamide) has been prepared and its crystal structure has been determined by X-ray diffraction methods. The complex molecule locates around an inversion centre in the crystal state. Two DMF ligands coordinate to the Cu(II)…
Open circuit potentials of stainless steels increased when immersed in the Baltic Sea. The ennoblement potential was +200 mVsce in 40 to 50 days when sea water temperature was below 52°C and +300–400 mVsce within <40 days at around 102°C. Ennoblement occurred in a laboratory ecosystem at 232°C in 20 to 30 days, and at…