Stabilization of the Oxidation State +IV in Siloxide-Supported Terbium Compounds

The synthesis of lanthanides other than cerium in the oxidation state +IV has remained a desirable but unmet target until recently, when two examples of Tb^IV with saturated coordination spheres were isolated. Here we report the third example of an isolated molecular complex of terbium(IV), where the supporting siloxide ligands do not saturate the coordination sphere. The fully characterized six-coordinate complex [Tb^IV(OSiPh₃)₄(MeCN)₂], 2 -Tb^Ph, shows high stability and the labile MeCN ligands can be replaced by phosphinoxide ligands. Computational studies suggest that the stability is due to a strong π(O−Tb) interaction which is stronger than in the previously reported Tb^IV complexes. Cyclic-voltammetry experiments demonstrate that non-binding counterions contribute to the stability of Tb^IV in solution by destabilizing the +III oxidation state, while alkali ions promote Tb^IV/Tb^III electron transfer.     

Numerical calculation and experimental measurement of temperatures and welding residual stresses in a thick-walled T-joint structure

Journal of Thermal Analysis and Calorimetry - In this investigation, a T-joint numerical welding simulation of thick steel plates is performed to estimate transient temperature distributions,...     

Stabilization of the Oxidation State +IV in Siloxide‐Supported Terbium Compounds

The synthesis of lanthanides other than cerium in the oxidation state +IV has remained a desirable but unmet target until recently, when two examples of Tb^IV with saturated coordination spheres were isolated. Here we report the third example of an isolated molecular complex of terbium(IV), where the supporting siloxide ligands do not saturate the coordination sphere. The fully characterized six‐coordinate complex [Tb^IV(OSiPh₃)₄(MeCN)₂], 2 ‐Tb^Ph, shows high stability and the labile MeCN ligands can be replaced by phosphinoxide ligands. Computational studies suggest that the stability is due to a strong π(O?Tb) interaction which is stronger than in the previously reported Tb^IV complexes. Cyclic‐voltammetry experiments demonstrate that non‐binding counterions contribute to the stability of Tb^IV in solution by destabilizing the +III oxidation state, while alkali ions promote Tb^IV/Tb^III electron transfer.     

Investigations of the Rheology and Reactivity of Extrudable Wood-Resin Compounds

The extrusion of wood composites based on thermosetting resins is a new application in the field of wood plastic composites. To enable the extrusion of wood thermosetting compounds, it is necessary to know their reactivity and rheology well beforehand, to prevent the system curing inside the extruder. This study shows the different techniques that were adapted to allow in combination an estimation of the processing behaviour of wood-resin compounds in extrusion.     

Investigations of the Rheology and Reactivity of Extrudable Wood-Resin Compounds

Summary. The extrusion of wood composites based on thermosetting resins is a new application in the field of wood plastic composites. To enable the extrusion of wood thermosetting compounds, it is necessary to know their reactivity and rheology well beforehand, to prevent the system curing inside the extruder. This study shows the different techniques that were adapted to allow in combination an estimation of the processing behaviour of wood-resin compounds in extrusion.     

Structure of Diels-Alder adduct of phenylated germole and 1,4-epoxy-1,4-dihydronaphthalene revisited

High pressure synthesis of Diels-Alder adduct of 1,1-dimetyl-2,3,4,5-tetraphenylgermole and 6,7-dibromo-1,4-epoxy-1,4-dihydronaphthalene is described. The X-ray crystallography analysis of the so obtained adduct indicated that the adduct has exo,endo-structure in agreement with our earlier proposal for the stereochemistry of the structurally related germa analogue, 11,11-dimethyl-9,10-epoxy-1,4-germa-1,2,3,4-tetraphenyl-1,4,4a,9,9a,10-hexahydroanthracene based on NMR analysis.     

N‐Benzyloxy‐1H‐benzotriazole‐1‐carboxamide: a hydrogen‐bonded tetramer based upon a rare R44(20) structural motif

The title compound, C₁₄H₁₂N₄O₂, is the first example of a heterocyclic substituted hydroxamic derivative. The asymmetric unit consists of two molecules. The molecules are linked into centrosymmetric R₄⁴(20) tetramers by four strong hydrogen bonds of the N—H...O and N—H...N types. These tetramers are connected through C—H...O interactions into a three‐dimensional network.     

A topology on lattice ordered groups

We show that a lattice ordered group can be topologized in a natural way. The topology depends on the choice of a set of admissible elements (-topology). If a lattice ordered group is 2-divisible and satisfies a version of Archimedes' axiom (-group), then we show that the -topology is Hausdorff. Moreover, we show that a -group with the -topology is a topological group.