Location of Terminal Groups of Dendrimers: Brownian Dynamics Simulation
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A TEM and EPR Investigation of the Competitive Binding of Uranyl Ions to Starburst Dendrimers and Liposomes: Potential Use of Dendrimers as Uranyl Ion Sponges
Transmission electron micrographs (TEM) of UO 2 2+ -negatively stained starburst dendrimers (SBDs), members of the family of dendritic macromolecules, have been analyzed in the absence and in the presence of dimyristoyl-phosphatidylcoline (DMPC) liposomes and mixed DMPC/DMPA-Na (the sodium salt of DMP-colate) liposome…
Enzyme-Catalyzed Ring-Opening Copolymerization of 5-Methyl-5-benzyloxycarbonyl-1,3-dioxan-2-one (MBC) with Trimethylene Carbonate (TMC): Synthesis and Characterization
Enzymatic ring-opening copolymerization of 5-methyl-5-benzyloxycarbonyl-1,3-dioxan-2-one (MBC) with trimethylene carbonate (TMC) was investigated. A route to aliphatic polycarbonates decorated with pendent carboxylic acid groups is demonstrated. Lipase from Pseudomonas fluorescens (AK) was selected to perform the copo…
Controlled Assembly of Polyoxometalate Chains from Lacunary Building Blocks and Lanthanide-Cation Linkers
Lineare, polymere Polyanionen entstehen aus lakunären Polyoxowolframat-Einheiten und Lanthanoid-Ionen (siehe Bild). Angesichts der vielen Lanthanoide und lakunären Polyoxoanionen ist damit eine beträchtliche Zahl an neuen Materialien zugänglich.
Unprecedented Expansion of the Pore Size and Volume of Periodic Mesoporous Silica
Adjusting the pore size and volume of molecular sieve MCM-41 over a very wide range is possible through simple hydrothermal treatment of “off the shelf”, as-synthesized materials in a decyldimethylamine (DMDA)–water emulsion (see schematic representation). The amine/silica ratio as well as the time and temperature of…
High Efficiency Near-IR Emission of Nd(III) Based on Low-Vibrational Environment in Cages of Nanosized Zeolites
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTHigh Efficiency Near-IR Emission of Nd(III) Based on Low-Vibrational Environment in Cages of Nanosized ZeolitesYuji Wada, Tatsuya Okubo, Munenori Ryo, Toru Nakazawa, Yasuchika Hasegawa, and Shozo YanagidaView Author Information Material and Life Science, Graduate Schoo…
Luminescent Mesoporous Molecular Materials Based on Neutral Tetrametallic Rectangles
The square hole for the round peg: The first two members of a new family of tetrametallic cyclophanes (1; M=MnI, ReI), which feature rectangular cavities, have been synthesized and characterized. Both of the luminescent compounds behave as mesoporous materials in a thin film and display high capacities and substantial…
Millimeter-Wave Spectroscopy of the Organic spin-Peierls System b'-(ET)2SF5CF2SO3
The first purely organic BEDT-TTF spin-Peierls system, b'-(ET)2SF5CF2SO3, has been confirmed using a high-frequency electron spin resonance (EPR) cavity perturbation technique. The material exhibits the characteristics of a quasi-one-dimensional (1D) Heisenberg antiferromagnetic spin system above 30 K, but undergoes a…
Surface Coating with Cyclic RGD Peptides Stimulates Osteoblast Adhesion and Proliferation as well as Bone Formation
The physiological inertness of synthetic implant materials often results in insufficient implant integration and limited acceptance of implants in tissues. After implantation the implant surface is often separated from the surrounding healthy and regenerating tissue, for example by a fibrous capsule. To avoid this hos…
Controlled Assembly of Polyoxometalate Chains from Lacunary Building Blocks and Lanthanide-Cation Linkers
Linear polymeric polyanions (see picture) are assembled from lacunary polyoxotungstate building blocks and lanthanide cations. Given the large number of lanthanide and lacunary polyoxoanions available, a considerable variety of new materials is now accessible.
γ-Ray Curing of Poly(methylsilane) and Poly(methylsilane−dimethylsilane) for Improved Ceramic Yields
Poly(methylsilane) (PMS) and poly(methylsilane−dimethylsilane) copolymers (P(MS−DMS)) were synthesized by Wurtz type polycondensation reactions of methyldichlorosilane or methyldichlorosilane−dimethyldichlorosilane mixtures in toluene. The obtained polymers were sealed in Pyrex tubes under vacuum and cured with γ-rays…
In-Situ Generation of Maximum Trivalent Cobalt in Synthesis of Hydrotalcite-like Compounds MgxCoII1-x-yCoIIIy(OH)2(NO3)y·nH2O
In-situ generation of trivalent cobalt cations has been investigated for the hydrotalcite-like compounds Mg x Co II 1 - x - y Co III y (OH) 2 (NO 3 ) y · n H 2 O at 25−40 °C under oxygen-containing atmospheres. It is noted that with more involvement of Mg 2+ in the compounds, less Co 2+ cations are needed to maintain…
4-Boratastyrylstilbene and 1,4-Bis(boratastyryl)benzene: Synthesis, Structural Characterization, and Photophysics
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXT4-Boratastyrylstilbene and 1,4-Bis(boratastyryl)benzene: Synthesis, Structural Characterization, and PhotophysicsBun Yeoul Lee and Guillermo C. BazanView Author Information Department of Chemistry, University of California Santa Barbara, California 93106 Cite this: J.…
Crystal Structures of Adrenodoxin Reductase in Complex with NADP+ and NADPH Suggesting a Mechanism for the Electron Transfer of an Enzyme Family,
Adrenodoxin reductase is a flavoenzyme that shuffles electrons for the biosynthesis of steroids. Its chain topology belongs to the glutathione reductase family of disulfide oxidoreductases, all of which bind FAD at equivalent positions. The three reported structures of adrenodoxin reductase were ligated with reduced a…
Backbone Photochromic Polymers Containing the Dimethyldihydropyrene Moiety: Toward Optoelectronic Switches
The design and synthesis of the first electrically conducting main chain photochromic conjugated polymer incorporating dimethyldihydropyrene is reported, as is the demonstration of the corresponding repeat unit as an optoelectronic redox switch.
Preparation of Semiconductor Nanoparticle−Polymer Composites by Direct Reverse Micelle Polymerization Using Polymerizable Surfactants
Metal sulfide semiconductor nanoparticles of CdS and coprecipitated CdS−ZnS, when prepared in reverse micellar systems consisting of cetyl- p -vinylbenzyldimethylammonium chloride (CVDAC), were immobilized via an in situ polymerization of CVDAC, using 2,2‘-azobisisobutyronitrile or visible light irradiation. The nanop…
Reactive Deposition of Conformal Palladium Films from Supercritical Carbon Dioxide Solution
High-purity palladium films were deposited onto Si wafers and polyimide by the reduction of organopalladium compounds in supercritical CO 2 solution using a batch process at temperatures between 40 and 80 °C and pressures between 100 and 140 bar. Hydrogenolysis of π-2-methylallyl(cyclopentadienyl)palladium(II) in CO 2…
Quantitative Analysis of Ti−O−Si and Ti−O−Ti Bonds in Ti−Si Binary Oxides by the Linear Combination of XANES
X-ray absorption near edge structure (XANES) of Ti K-edge of Ti−Si mixed oxides and titania supported on silica with various Ti contents was studied to investigate the fractions of Ti−O−Si and Ti−O−Ti bonds quantitatively by fitting the preedge of Ti K-edge with the linear combination of two reference XANES spectra. I…
Relationship between the Microstructure and the Mechanical and Barrier Properties of Whey Protein Films
This work was focused on the relationship between the microstructure and the mechanical and barrier properties of whey protein isolate (WPI) films. Sorbitol (S) and glycerol (G) were used as plasticizers and the pH was varied between 7 and 9. The films were cast from heated aqueous solutions and dried in a climate roo…
An Assay for Ascorbic Acid Based on Polyaniline-Coated Microplates
A technique for modification of the microtiter reader plates well with a polyaniline (PANI) film sensitive for ascorbic acid is presented. The principle of the analyte detection is based on monitoring the changes in optical absorption of the PANI film resulting from the reduction process initiated by ascorbic acid. Th…