Materials Literature
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Self-assembly of the linear oligobipyridine ligands 3 or 4, of the bipyrimidine 5 and of cooper(I) ions generates the inorganic architectures of ladder type 1 or 2.
Reaction of [Fe(CN)6]3– with [Cu(tpa)(OH2)]2+ produces a bimetallic heptanuclear complex, [Fe{(CN)Cu(tpa)}6]-[ClO4]8·3H2O, which is characterised by single-crystal X-ray diffraction and shown to consist of an iron(II) centre connected by cyano bridges to six copper(II) centres forming spherical units of [Fe{(CN)Cu(tpa…
The pore size distribution of four commercial silica materials saturated with water have been derived from experimental 1 H NMR intensity vs temperature curves ( IT -curves) of the confined water. The observed melting points or transition temperatures of benzene and cyclohexane confined in the same materials are shown…
Carboxylate−alumoxanes, [Al(O) x (OH) y (O 2 CR) z ] n, have been uniformly doped with a transition metal or lanthanide. Thermolysis of the doped alumoxanes yields homogeneous mixed-metal oxides. The carboxylate−alumoxanes were synthesized by the reaction of boehmite, [Al(O)(OH)] n, with either hexanoic, octanoic, met…
A new equilibrium morphology consisting of randomly oriented wormlike micelles dispersed in a continuous matrix is observed in a neat, strongly segregated I 2 S simple graft block copolymer. The equilibrium nature of the worm phase is determined via a set of selective solvent casting and prolonged annealing experiment…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTLiCl Induced Morphological Changes in Polyaniline Base and Their Effect on the Electronic Properties of the Doped FormMarie Angelopoulos, Yun-Hsin Liao, Bruce Furman, and Teresita GrahamView Author Information IBM Research Division,…
A series of regiospecific, alkyl-substituted oligothiophenes were synthesized and their structure/property relationships were studied. The formylation of the oligothiophenes introduced an aldehyde functionality into one of the terminals which can be used to couple with living anionic polystyrene species to generate di…
DnaK, a member of the 70 kDa heat shock protein (hsp70) family, and its complexes with substrate proteins and nucleotides were characterized by small-angle X-ray scattering (SAXS) and size-exclusion chromatography (SEC) techniques. The SAXS data indicated that DnaK has a dumbbell-shaped structure with a maximum dimens…
A time-resolved FT-IR technique combined with an isotopic tracer method has been applied to study CO adsorbates on Cu(+) ions in copper ion-exchanged zeolites. Three kinds of monocarbonyl species were found to adsorb strongly on Cu-zeolite samples after admission and subsequent evacuation of gas phase CO at room tempe…
Supersaturated bicontinuous microemulsions have been used as organized reaction environments for the chemical synthesis of calcium phosphates with interconnected microskeletal architectures. Nucleation of apatite occurs within the nanometer-size water conduits of oil/water microemulsions stabilized with didodecyldimet…
Full optimizations of Pd n cluster geometries have been performed using density functional methods and allowing the occurrence of low-symmetry structures. To account for at least partially for relativistic effects, use was made of Hay and Wadt RECP. The following ground states were found respectively for n = 1, 2, 3,…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTShip-in-Bottle Synthesis of [Pt15(CO)30]2- Encapsulated in Ordered Hexagonal Mesoporous Channels of FSM-16 and Their Effective Catalysis in Water-Gas Shift ReactionTakashi Yamamoto, Toshifumi Shido, Shinji Inagaki, Yoshiaki Fukushima, and Masaru IchikawaView Author Inf…
Abstract Statistical analysis of the solid‐state structures available for the cyclodextrins and their inclusion compounds – 42 for α‐CD ( 1 ), 48 for β‐CD ( 2 ), and 8 for γ‐CD ( 3 ) – revealed their mean molecular geometry parameters to be within normal ranges, such as the intersaccharidic bond angle (φ) and torsion…
Microporous silica materials with tailored porosity are synthesized by the sol–gel process using lyotropic liquid-crystal phases as templates. The starting isotropic sol is obtained by mixing tetramethoxysilane, water and an alkyltrimethylammonium bromide. The polymerization of the silica network and the formation of…
Modern micro- and nano-fabrication methods provide a new avenue to prepare controlled model catalysts, which realistically mimic real supported catalysts. Such catalysts consist of 2D arrays of active catalysts deposited on active or inactive support materials. Particle size, shape, separation and support can be syste…
A series of poly[(alkyl ether)phosphazenes] was synthesized and their lower critical solution temperatures (LCST) were examined in water at concentrations from 0.1 to 30.0 wt %. The polymers synthesized were poly[bis(2,3-dimethoxypropanoxy)phosphazene], poly[bis(2,3-bis(2-methoxyethoxy)propanoxy)phosphazene], poly[bis…
This paper describes a computational procedure for the determination of complete crystal structures when the cell dimensions and space group only are known from X-ray crystallography. Molecular structure and conformation are assumed, and cannot be refined. When diffraction intensity data are available, the procedure o…
MCM-41 type mesoporous silica material is synthesized, under mild conditions, in the presence of cetylpyridinium chloride as the templating species. Seven reflections become observable in the powder X-ray diffraction pattern of this material that can be indexed on the basis of a hexagonal close-packed unit cell with a…
In model reactions for the synthesis of phosphine-terminated tentacles of polyamine dendrimers, the amides MeNHCOC 2 H 4 PPh 2 ( 2a ) and (CH 2 NHCOC 2 H 4 PPh 2 ) 2 ( 2b ) were prepared from the spacer phosphine (diphenylphosphino)propionic acid ( 1 ) and methylamine or ethylenediamine, respectively, using EDC [ N -e…
Stable mixed monolayers are prepared by combining Langmuir−Blodgett (LB) deposition with self-assembly. Islands of stable organosilane monolayers are formed on mica by the LB technique and the bare surface is then employed as a substrate for further selective self-assembly. When a surface covered by octadecyltrichloro…