Materials Literature
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The mystery of proficiency remains: The recently solved crystal structures of free orotidine monophosphate decarboxylase (ODCase) and of the enzyme in complex with inhibitors reveal unusual structural features. However, despite the similarities among the structures, several startling new mechanisms of action have been…
In this paper the monodomain-alignment of new photocrosslinkable fluorene bisacrylate model compounds and oligomers is reported. The orientation of the nematic LC- phase is preserved by photopolymerization in an oriented LC- network. Monodomain orientations of crosslinked fluorene bisacrylates are investigated by UV-V…
Nanopartikel mit hoher Photolumineszenz-Quantenausbeute werden neuerdings als mögliche Markierungssubstanzen für Biomoleküle und als Leuchtsubstanzen für optoelektronische Bauteile diskutiert. In einem koordinierenden Lösungsmittel konnten nun chemisch stabile, kaum toxische LaPO4:Ce,Tb-Nanokristalle (siehe Bild) im G…
The catalytic deep oxidation of methanol by oxygen on the Pt(111) surface under ambient pressure conditions has been studied by in situ infrared reflection absorption spectroscopy (IRAS). It was found that the Pt(111) surface was covered with formate in a flow of 0.16 kPa of methanol and >1.3 kPa of oxygen mixture at…
The melt surface tension for a series of hyperbranched polymers was measured using the micro-Wilhelmy wetting technique. The surface tension was found to be extremely high for the hydroxyl-terminated hyperbranched polymers and approached that of water extrapolated to high temperature. Substituting an alkane on the end…
The enormous enhancement of the transformation of orotate into uracil in the active site of orotidine monophosphate decarboxylase (ODCase) has been recently attributed to a ground-state destabilization (GSD) mechanism. These proposals are scrutinized here by reconsidering the relevant energetics on the basis of the cr…
Duck delta1 and delta2 crystallin are 94% identical in amino acid sequence, and while delta2 crystallin is the duck orthologue of argininosuccinate lyase (ASL) and catalyzes the reversible breakdown of argininosuccinate to arginine and fumarate, the delta1 isoform is enzymatically inactive. The crystal structures of w…
We report predominantly zero-field muon spin relaxation measurements in a series of Ca-doped ${\mathrm{LaMnO}}_{3}$ compounds which includes the colossal magnetoresistive manganites. Our principal result is a systematic study of the spin-lattice relaxation rates ${1/T}_{1}$ and magnetic order parameters in the series…
No abstract prepared.
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…