Materials Literature
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The rapid development of catalytic membrane reactors requires materials with a higher permeability and a better mechanical stability than the current thick membranes. Pd-based composite membranes supported on porous stainless steel offer such an alternative. However, commercially available porous stainless steel mater…
The problem of intramolecular hydrogen atom exchange in the OsH 3 (BH 4 )(PR 3 ) 2 system is examined from both theoretical and experimental points of view, through ab initio MO calculations on the OsH 3 (BH 4 )(PH 3 ) 2 system at the MP2, MP4, and CCSD(T) computational levels and variable-temperature 1 H NMR studies…
Monoamine-terminated poly(ethylene oxide), PEO-NH 2 (MW ∼ 5000) has been grafted onto a hydrophobic backbone of polystyrene- alt -maleic anhydride. The backbone has been tagged with a constant fraction of naphthalene and with varying amounts of PEO-NH 2 . Dialysis from dioxane to 100% water produces micelles that have…
Several uncommon features are present in the (μ3-CO3)[Cu3(Medpt)3(ClO4)3](ClO4) complex: quasi-equilateral triangular arrangement of copper atoms; μ3 coordination of the carbonato bridge and ferromagnetic behavior. The title compound shows a gap of 18.9 cm-1 between the S = 3/2 ground state and the two degenerate S =…
Two polytypes of potassium rare-earth-metal hexaselenodiphosphates(IV), K(RE)P(2)Se(6) (RE = Y, La, Ce, Pr, Gd), have been synthesized from the stoichiometric reaction of RE, P, Se, and K(2)Se(4) at 750 degrees C. Both single-crystal and powder X-ray diffraction analyses showed that the structures of these polytypes v…
The reaction of trithiocyanuric acid (H3L) with CuCl(PPh3)3 gives [(CuPPh3)6L2], the structure of which shows two parallel triazine rings held in a close proximity of 3.07 Å by six Cu–S bridges; the complex [(CuPPh3)6L2] shows visible emission in the solid state and in fluid solution at room temperature.
A simple procedure for the preparation of stereoregular polyhydroxypolyamides, i.e., head, tail hydroxylated nylons, derived from d -glucaric acid and alkylenediamines is described. Sodium d -glucarate 6,3-lactone was made in two steps from monopotassium d -glucarate by way of d -glucaro-6,3-lactone. Methanol insolubl…
Previous studies have demonstrated that the binding and reactivity of aliphatic alcohols on TiO 2 surfaces are controlled by local coordination environments at the binding sites. As a result, there is excellent correspondence between chemisorption/temperature-programmed desorption results on rutile single crystals and…
A novel metallopolymer of DM-DCNQI (2,5-DM-DCNQI = 2,5-dimethyl-N,N‘-dicyanoquinone diimine) has been structurally determined. [Mo2(O2CCF3)4(2,5-DM-DCNQI)·C6H6]n crystallizes with enclathrated benzene which forms π-stacks with DM-DCNQI along the c direction. The orientation of the zigzag chains viewed down the c axis…
A series of derivatized bis(pyrrol-2-yl) arylenes, specifically 1,4-bis(pyrrol-2-yl)benzene ( 1e, BPB), 1,4-bis(pyrrol-2-yl)-2,5-dimethoxybenzene ( 2e, BPB(OCH 3 ) 2 ), 1,4-bis(pyrrol-2-yl)-2,5-diethoxybenzene ( 3e, BPB(OC 2 H 5 ) 2 ), 1,4-bis(pyrrol-2-yl)-2,5-didodecyloxybenzene ( 4e, BPB(OC 12 H 25 ) 2 ), 2,6-bis(py…
The crystal structures of the diastereomeric salts of 1-arylethylamines with mandelic acid or p-methoxymandelic acid have been studied. This revealed that there was correlation between the efficiencies of the optical resolutions of the amines with the resolving reagents and the crystal structures of the salts. A chara…
A series of syndiotactic poly(methyl methacrylate) (sPMMA)−polybutadiene (PBD)−sPMMA triblock copolymers, or MBM, have been successfully synthesized by using dilithium initiators (DLi's) based on the diadduct of tert -butyllithium ( t -BuLi) to either 1,3-bis(1-phenylethenyl)benzene (PEB) or m -diisopropenylbenzene (…
A building block approach towards porphyrin arrays is used to construct pentameric and nonameric porphyrin arrays in one step.
The synthesis and full characterization of a new hydrotalcite-like compound with the formula [Mg(0.71)V(0.29)(OH)(2)](CO(3))(0.145).0.72H(2)O and with V(3+) in the layers are described. The influence of hydrothermal treatment and drying rate on the crystallinity of the materials obtained is discussed. The evolution to…
Palladium-mediated cross-coupling reactions of [(bpy)2Ru(3-bromo-1,10-phenanthroline)]2+(PF6–)2 with various aromatic acetylenes and of [(bpy)2Ru(3-ethynyl-1,10-phenanthroline)]2+(PF6–)2 with aromatic iodides give mono-, di- and tri-nuclear complexes in high yields and under mild conditions.
The orthorhombic crystal structures of [NEt3H]5[XCoIIW11O39]·3H2O for X = P and As have been determined with data collected at room temperature, and for X = P at –100 °C, using Mo-Kα radiation. For the latter the space group is Pna21, a= 21.670(11), b= 14.805(4), c= 20.393(5)Å and Z= 4. The structure consists of chain…
Oligo- and poly-(1,1′-dihexylferrocenylenes), more soluble than unsubstituted oligo- and poly-(1,1′-ferrocenylenes), were synthesized by reaction of dihexylfulvalene dianion with [FeCl2(thf)2](thf = tetrahydrofuran). Electrochemical properties of pentamers and a hexamer were revealed and compared with theory for a sys…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of Model 16-Miktoarm (Vergina†) Star Copolymers of the A8B8 TypeApostolos Avgeropoulos, Yiannis Poulos, Nikos Hadjichristidis, and Jacques RooversView Author Information Department of Chemistry, University of Athens, Panep…
In humans, infection with Listeria monocytogenes (L. monocytogenes) can severely affect the central nervous system (CNS). In the present study we have employed a murine model of CNS listeriosis to characterize the intracerebral distribution of L. monocytogenes. Following intracerebral application of a low dose of L. m…
The equilibrium distribution of catalytic intermediates formed in the reaction of L-serine with the tryptophan synthase alpha 2 beta 2-complex from Salmonella typhimurium has been investigated by absorption and fluorescence spectroscopy as a function of pH, temperature, and alpha-subunit ligands. The novel result of t…