Materials Literature
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o -Trifluoromethyl(phenylacetylene) ( o TFMPA) was successfully polymerized by a Rh complex, [Rh(norbornadiene)Cl] 2 catalyst, in the presence of triethylamine as the polymerization solvent under mild conditions. Structural differences between the Rh polymer and the Mo polymer prepared with a metathesis initiator, MoO…
The π-conjugated molecule N,N′-bis(4′-dimethylaminophenyl)-1,4-benzoquinone diimine (L2) was incorporated into the palladium(II) complex 1 bearing the N,N′-bis(2-phenylethyl)-2,6-pyridinedicarboxamide ligand, to afford the redox-active conjugated palladium(II) homobimetallic complex 2. An X-ray crystal structure deter…
A series of poly(beta-alanine) dendrimers 1-4 with Boc-carbamate as the surface functionality, beta-alanine as the dendritic branch, 3,5-diaminobenzoic acid as the branching agent, and 1,2diaminoethane as the interior core has been synthesized by a solution-phase peptide-coupling method. The structural identities and…
Enantiomerically pure dithiolene complexes NBu4[Ni[(R,R)-diotte)2] and NBu4[Ni((S,S)-diotte]2] (diotte2- = a 1,3-dioxolane-tetrathiaethylene), were prepared from the corresponding enantiomers of a diotte2- precursor. The structure of the precursor was solved by single-crystal X-ray analysis; desulfurization afforded a…
Dass unter Rothemund-Bedingungen noch unbekannte Verbindungen entstehen können, erschien manchen Porphyrinchemikern schon als unwahrscheinlich, doch aus der säurekatalysierten Kondensation von aromatischen Aldehyden und Pyrrolen ging ein neuer Typ von expandierten Porphyrinen hervor: NFP5-Y (24 π-Elektronen, gelb) und…
A regioregular head-to-head/ tail-to-tail poly(beta,beta'-disubstituted bithiophene) P1 was synthesised by chemical and electrochemical polymerisation of 2,2'-bithiophene that bears (S)-2-methylbutylsulfanyl chains in the beta and beta'-positions. The polymer was characterised by GPC, NMR and UV/Vis spectroscopy, CD,…
The structure and dynamics of the surrounding water were studied through molecular dynamics (MD) simulations for several GdIII polyaminocarboxylate and polyaminophosphonate complexes in aqueous solution. The radial distribution functions (rdf) show that a few water molecules are bonded to the ligand through hydrogen b…
Beseitigung von radioaktivem Abfall, egal welchen Ursprungs, ist ein wichtiges Problem, zu dessen Lösung der expandierte Porphyrinligand 1 beitragen könnte: Sowohl mit Uranyl- (UO22+) als auch mit Neptunyl-Ionen (NpO2+) bildet er stabile Komplexe.
Chirale Erkennung in Organogelen findet statt bei der Aggregation des chiralen Gelbildners 1 mit der chiralen Gastverbindung 2. Die diastereomeren Aggregate, die aus (R,R)-2 und (R,R)-1 bzw. (S,S)-1 entstehen, zeigen deutlich unterschiedliches strukturelles Verhalten. Kooperativität trägt hier wesentlich zur chiralen…
The transport and magnetic properties of single crystals of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ $(x=0.2,$ 0.3) have been investigated. The transport and magnetization results of the ferromagnetic insulator, ${\mathrm{La}}_{0.8}{\mathrm{Ca}}_{0.2}{\mathrm{MnO}}_{3},$ are quite differen…
Traditional semiconductor technology is based entirely on exploiting electron charge. Researchers are now investigating ways to use both electronic properties and electron spin simultaneously in semiconductors. The goal is the development of spintronic devices that integrate processing and storage capabilities thus fa…
A correlation between the osmotic second virial coefficient and the solubility of proteins is derived from classical thermodynamics to support an empirical relation previously found by Wilson and co-workers (1). The model is based on the equality of fugacities of the protein in the equilibrium phases, with the details…
Optical properties of single-crystal monoclinic CuO in the range $70--6000 {\mathrm{cm}}^{\ensuremath{-}1}$ were studied at temperatures from 7 to 300 K. Normal reflection spectra were obtained from the (001) and (010) crystal faces thus giving separate data for the ${A}_{u}$ and ${B}_{u}$ phonon modes excited in the…
La1-xCaxMnO3 (x = 0.3; LCMO) films of different thickness were sputter-deposited on SrTiO3(100) (STO) single crystal substrates with and without YBa2Cu3O7-d (YBCO) as template layer. The electric and magnetic properties and the microstructure of the films were studied. Clear differences in the out-of-plane lattice par…
1-Nonanethiol-capped silver nanoparticles of about 4.18 nm in diameter were prepared using a liquid−liquid two-phase method. Two-dimensional ordered superlattices of the nanoparticles were formed on carbon films coated on transmission electron microscopy (TEM) copper grids by evaporating a drop of the dispersion in ch…
A computational study of the exchange coupling is presented for a selected sample of carboxylato-bridged dinuclear copper(II) compounds. Model calculations have been used to examine the influence of several factors on the coupling constants: a) the electron-withdrawing power of the bridging ligands; b) the nature of t…
Dilute magnetic semiconductors and wide gap oxide semiconductors are appealing materials for magnetooptical devices. From a combinatorial screening approach looking at the solid solubility of transition metals in titanium dioxides and of their magnetic properties, we report on the observation of transparent ferromagne…
A theoretical model is proposed that describes the dependence of foam stability on the surfactant concentration in a foam-forming solution. The model is based on the parameters reflecting a fractal structure and percolation properties of the foam. It is established that a time corresponding to the onset of the liquid…
Transparent and crack-free Bi2Ti2O7 thin films with strong (111) orientation were successfully prepared on n-Si(100) by chemical solution deposition (CSD) using bismuth nitrate and titanium butoxide as starting materials. The growth procedure of the Bi2Ti2O7 thin films is discussed in this paper. The surface morpholog…
The results of EPR investigation of improper ferroelastic crystals MgGeF6·6H2O: Mn2+ allow to conclude that at Ti1=403 K these crystals undergo transition to structurally incommensurate phase. The order parameter of this transition is probably the angle of Mg[H2O]6 2+ octahedra rotation around crystal C3 axis, which d…