A strategy for constructing photosynthetic models: porphyrin-containing modules assembled around transition metals
A. Harriman and J. Sauvage, Chem. Soc. Rev., 1996, 25, 41 DOI: 10.1039/CS9962500041
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Assemblage and Alignment of the Spins of the Organic Trinitroxide Radical with a Quartet Ground State by Means of Complexation with Magnetic Metal Ions. A Molecule-Based Magnet with Three-Dimensional Structure and High TC of 46 K
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTAssemblage and Alignment of the Spins of the Organic Trinitroxide Radical with a Quartet Ground State by Means of Complexation with Magnetic Metal Ions. A Molecule-Based Magnet with Three-Dimensional Structure and High TC of 46 KKatsuya Inoue, Takashi Hayamizu, Hiizu I…
Dendritic Molecules: Concepts, Syntheses, Perspectives
Masses, Sizes, and Shapes of Macromolecules from Multifunctional Monomers From Theory to Practice: Historical Perspectives Nomenclature Synthetic Methodologies: Divergent Procedures Synthetic Methodologies: Convergent Procedures Synthetic Methodologies: One-step (Hyperbranched) Procedures Chiral Dendritic Macromolecul…
Mimicking Aspects of Heterogeneous Catalysis: Generating, Isolating, and Reacting Proposed Surface Intermediates on Single Crystals in Vacuum
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMimicking Aspects of Heterogeneous Catalysis: Generating, Isolating, and Reacting Proposed Surface Intermediates on Single Crystals in VacuumBrian E. BentView Author Information Department of Chemistry and Columbia Radiation Laboratory, Columbia University, New York, New Yor…
Giant Magnetoresistance and Related Properties of Rare-Earth Manganates and Other Oxide Systems
Giant magnetoresistance (GMR), which was until recently confined to magnetic layered and granular materials, as well as doped magnetic semiconductors, occurs in manganate perovskites of the general formula Ln 1- x A x MnO 3 (Ln = rare earth; A = divalent ion). These manganates are ferromagnetic at or above a certain v…
Getting excited about lanthanide complexation chemistry
Lanthanide complexation chemistry in solution is an active research theme because of the importance of gadolinium complexes as contrast agents in magnetic resonance imaging, and of luminescent europium and terbium complexes as probes in biochemistry. The physicochemical principles and theory underpinning this work are…
Dendrimer-Metalloporphyrins: Synthesis and Catalysis
A new class of sterically hindered dendrimer-metalloporphyrins was synthesized for use as shape-selective oxidation catalysts. A series of oxidatively robust poly(phenylesters) dendrimers were prepared through a convergent synthesis. Monodendrons were appended to the meta -positions of the 5,10,15,20-tetrakis(3‘,5‘-hy…
Mesoporous Titanosilicate Molecular Sieves Prepared at Ambient Temperature by Electrostatic (S+I-, S+X-I+) and Neutral (S°I°) Assembly Pathways: A Comparison of Physical Properties and Catalytic Activity for Peroxide Oxidations
Hexagonal mesoporous titanosilicates with distinguishable framework charges and textural mesoporosity, namely, Ti-MCM-41 and Ti-HMS, were prepared at ambient temperature by electrostatic and neutral assembly processes, respectively. Titanium incorporation at the 2 mol % level for both materials was accompanied by incr…
Fatigue Damage Evolution and Degradation of Mechanical Properties in Silicon-Carbide (SiC) Fiber-Reinforced Titanium Matrix Composites
Fatigue damage accumulation and failure modes of several unidirectional and angle-ply SCS-6 fiber-reinforced titanium matrix composites are reviewed. The fatigue damage characteristics of the notched and unnotched composites were classified using several schematic diagrams based upon the constituent's properties and l…
Growth of gallium oxide thin films from gallium acetylacetonate by atomic layer epitaxy
Gallium oxide thin films have been deposited by atomic layer epitaxy (ALE) using Ga(acac)3(acac = pentane-2,4-dionate) and either water or ozone as precursors. Films were grown on silicon (100), soda lime and Corning glass substrates. The influence of the deposition parameters (e.g. pulse duration, growth and source t…
Crystal growth of organic materials
The Application of Computational Chemistry to the Study of Molecular Materials On the Crystallographic and Statistical Mechanical Foundations of the Hartman-Perdok Theory An Ab Initio Approach to Crystal Structure Determination Using High Resolution Powder Diffraction and Computational Chemistry Techniques An Automate…
Team Toyota : transplanting the Toyota culture to the Camry plant in Kentucky
In Team Toyota Besser presents the results of an in-depth study of Toyota's assembly plant in Georgetown, Kentucky. Based on employee interviews, analyses of company publications, newspaper accounts, interaction with company employees and attendance at company events over a five-year period, this book documents how To…
Nanometer-Scale Electropolymerization of Aniline Using the Scanning Tunneling Microscope
The platinum tip of a scanning tunneling microscope is employed to direct the electropolymerization of aniline on nanometer-scale regions of a graphite surface which is immersed in an aqueous, aniline-containing electrolyte. The electropolymerization of aniline is initiated by two bias voltage pulses which are applied…
Free-Radical Ring-Opening Polymerization of Cyclic Allylic Sulfides
A new type of ring-opening monomer has been investigated and found to undergo facile and efficient free-radical polymerization. The monomers are cyclic allylic sulfides with 6-methylene-1,4-dithiepane ( 3 ) and 3-methylene-1,5-dithiacyclooctane ( 4 ) synthesized and investigated as two examples. 6-Methylene-1,4-dithie…
From a Dissolved Polystyrene Coil to an Intramolecularly-Hyper-Cross-Linked “Nanosponge”
Linear polystyrene of M w = 330 000 and M w / M n = 1.04 in which 50% and 100% of the phenyl residues were chloromethylated were heated in a 0.5 g/L ethylene dichloride solution in the presence of SnCl 4 to convert them into an intramolecularly hyper-cross-linked soluble material. The spherical macromolecular species…
Liposomes preparation methods.
In this article information about various methods of liposome preparation (including the large scale manufacture) has been reviewed. The advantages and disadvantages of the methods have been described in terms of size distribution and encapsulation efficiency.
Adsorption and Displacement of Melamine at the Ag/Electrolyte Interface Probed by Surface-Enhanced Raman Microprobe Spectroscopy
Surface-enhanced Raman spectroscopy (SERS) is evaluated as a quantitative analytical tool for low concentrations of melamine and melamine derivatives in solution. Substantial variations in absolute and relative intensities of SERS bands were encountered using silver sols, which cannot be controlled. Alternatively, it…
Semicrystalline Diblock Copolymer Platelets in Dilute Solution
In dilute solution, semicrystalline diblock copolymers with one crystallizable block form thin platelet structures consisting of a chain-folded crystalline domain between solvated layers of the amorphous block chains. The amorphous block is attached to the crystalline fold surface, forming a model system of tethered c…
Permeability Properties of Fruit Puree Edible Films
ABSTRACT The potential of fruit purees as edible mass transfer barriers was studied. Water vapor and oxygen permeabilities (WVP and O 2 P) of peach puree films were evaluated at different relative humidities (RH) and temperatures (T). Peach puree was not a good water barrier. Peach and apricot films exhibited lower WV…
Effect of particle size and heating temperature of ceramic powders on antibacterial activity of their slurries.
The effects of particlesize and heating temperature of magnesium oxide (MgO), calcium oxide (CaO), and zinc oxide (ZnO) powders on the antibacterial activities of their slurries were studied by the conductance method. An increase in particle size of the powders reduced their antibacterial activity. The variation of ac…