Materials Literature
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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…
HSSP is a derived database merging structural three dimensional (3-D) and sequence one dimensional(1-D) information. For each protein of known 3-D structure from the Protein Data Bank (PDB), the database has a multiple sequence alignment of all available homologues and a sequence profile characteristic of the family.…
A series of poly(oxyethylene)−poly(oxybutylene) diblock copolymers have been prepared by anionic polymerization. The polymers were characterized by GPC and NMR and were found to have a narrow molar mass distribution. The structures of the melts were determined by SAXS, and peak shapes were found to be Lorentzian for d…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTHighly Branched, High Molecular Weight Polystannane from Dibutylstannane via a Novel Dehydropolymerization/Rearrangement ProcessJason R. Babcock and Lawrence R. SitaView Author Information Searle Chemistry Laboratory, Department of Chemistry The University of Chicago 5…
A new heterogeneous catalyst based on a chemically modified mesoporous silica gel possessing immobilised cobalt ions is developed and successfully applied to the epoxidation of alkenes.
The study deals with the heterogeneously catalyzed gas-phase hydrogenation of cis, trans, trans -1,5,9-cyclododecatriene on coated catalysts prepared by anodic oxidation of aluminum and a liquid-phase impregnation technique. The coat of the catalyst consists of alumina having a regular pore system and palladium as a c…
Protective effect of poly(ethylene glycol) and some other polymers on liposomes is considered in terms of statistical behavior of macromolecules in solution. According to the mechanism proposed, liposome-grafted chains of flexible and hydrophilic polymers form dense “conformational clouds” preventing other macromolecu…