Building large porphyrin arrays: pentamers and nonamers
A building block approach towards porphyrin arrays is used to construct pentameric and nonameric porphyrin arrays in one step.
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Synthesis and Characterization of Hydrotalcite-like Compounds Containing V3+in the Layers and of Their Calcination Products
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…
Coordination compounds as building blocks: single-step synthesis of multi-ruthenium(II) complexes
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.
Crystal structures of [NEt 3 H] 5 [XCo II W 11 O 39 ]·3H 2 O (X = P or As)
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…
Synthesis, electrochemistry and photoconductivity of oligo- and poly-(1,1′-dihexylferrocenylenes)
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…
Synthesis of Model 16-Miktoarm (Vergina) Star Copolymers of the A8B8 Type
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…
Intracerebral Targets and Immunomodulation of Murine Listeria monocytogenes Meningoencephalitis
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…
Allosteric Regulation of Tryptophan Synthase: Effects of pH, Temperature, and α-Subunit Ligands on the Equilibrium Distribution of Pyridoxal 5‘-Phosphate−l-Serine Intermediates
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…
The HSSP database of protein structure-sequence alignments
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.…
Order−Disorder Transition in Poly(oxyethylene)−Poly(oxybutylene) Diblock Copolymers
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…
Highly Branched, High Molecular Weight Polystannane from Dibutylstannane via a Novel Dehydropolymerization/Rearrangement Process
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…
Environmentally friendly catalysis using supported reagents: catalytic epoxidation using a chemically modified silica gel
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.
Heterogeneously Catalyzed Gas-Phase Hydrogenation of cis,trans,trans-1,5,9-Cyclododecatriene on Palladium Catalysts Having Regular Pore Systems
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…
How do polymers prolong circulation time of liposomes?
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…
Synthesis, structure and properties of nickel complexes of 4,5-tetrathiafulvalene dithiolates: high conductivity in neutral dithiolate complexes
Dianionic and neutral nickel complexes of substituted TTF dithiolate ligands have been prepared showing room-temperature conductivity of up to 10–1 S cm–1 for the neutral complexes; the crystal structure of the neutral complex [Ni(C10H10S8)2] is reported.
Copolymerization of 2,2-Dimethyltrimethylene Carbonate and l,l-Lactide
The ring-opening polymerization of mixtures of 2,2-dimethyltrimethylene carbonate (DTC) and l, l -lactide (LLA) in the melt, with diethyl zinc or dibutyltin dimethoxide as initiator, results in the formation of random copolymers. LLA polymerizes first in a fast reaction, followed by a slow polymerization of DTC. Inves…
Origin of depolarized light scattering in supercooled liquids: Orientational fluctuation versus induced scattering mechanisms
Depolarized light scattering spectra of liquid salol that have been analyzed in recent studies of the liquid-glass transition are reexamined in order to determine the relative importance of orientational fluctuations and interaction-induced scattering. First, the spectra of ${\mathrm{CCI}}_{4}$, ${\mathrm{CHCI}}_{3}$,…
Pore structure analysis of the mesoporous titanosilicate molecular sieve MCM-41 by 1H NMR and N2 sorption
The pore structure of the titanosilicate mesoporous molecular sieve [Si, Ti]-MCM-41 has been examined by N2 sorption and 1H NMR. Pore sizes determined by both methods are in good agreement. Titanosilicate MCM-41 has a broader pore size distribution than the purely siliceous material, and the diameter of its pores is l…
Three-Dimensional Solution Structure and 13C Nuclear Magnetic Resonance Assignments of the Colicin E9 Immunity Protein Im9,
The 86-amino acid colicin E9 immunity protein (Im9), which inhibits the DNase activity of colicin E9, has been overexpressed in Escherichia coli and isotopically enriched with 15N and 13C. Using the 3D CBCANH and CBCA(CO)NH experiments, we have almost completely assigned the backbone 13C resonances and extended previo…
Dynamic Aspects of Protein Adsorption onto Titanium Surfaces: Mechanism of Desorption into Buffer and Release in the Presence of Proteins in the Bulk
The release process for adsorbed IgG molecules on titanium particle surfaces in the presence of pure buffer or IgG molecules in solution was investigated by means of radiolabeling techniques. This study is part of a general investigation of the basic mechanisms underlying exchange processes of adsorbed proteins by mac…