Materials Literature
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Tetrahedral Al-containing MCM-41, prepared under ambient conditions, exhibits suitable catalytic properties for the conversion of low-density polyethylene into hydrocarbon feedstocks.
It has been found that mesoporous structures of MCM-41 and MCM-48 disintegrate readily in distilled water around 370 K, while the structures can be stable in 100%-steam of 1 atmospheric pressure at much higher temperatures around 820 K. Thus, the structure disintegration is thermodynamically more favorable in water th…
Recent studies of molecular orientation in sheared liquid crystalline polymers have often yielded contradictory results. To check the self-consistency of methods for quantitative measurements of molecular orientation, liquid crystalline solutions of (hydroxypropyl)cellulose [HPC] and poly(benzyl glutamate) [PBG] have…
New hybrid organic–inorganic materials are prepared by hydrolysis and polycondensation, or cocondensation with tetraethyoxysilane, of iron porphyrins bearing a trifluorosily function; despite their insolubility, these ‘metalloporphyrinosilicas’ are efficient catalysts for alkene epoxidation by PhiO or ButOOh and alkan…
U. Schubert, J. Chem. Soc., Dalton Trans., 1996, 3343 DOI: 10.1039/DT9960003343
A small cluster model is proposed and used to examine the properties of bound Cu ions and their interactions with CO and NO in Cu-exchanged zeolites, such as Cu−ZSM-5. The model uses H 2 O ligands to represent the framework oxygens of the zeolite lattice that form the local coordination environment of the Cu ion. Vari…
The redox behavior of CuZSM-5 was investigated by flow microbalance and FTIR measurements using CO and NO as probe molecules. The weight change resulting from switching the flow of 10% O 2 in He to pure He corresponded to the removal of extralattice oxygen and approximately 20% autoreduction of total copper ion by one…
A water soluble β-cyclodextrin (CD-NA) bearing seven naphthoyl chromophores forms very stable 1:1 complexes with a merocyanine laser dye DCM-OH (4-(dicyanomethylene)-2-methyl-6-( p -(bis(hydroxyethyl)amino)styryl)-4 H -pyran). The antenna effect, i.e. energy transfer from the naphthoyl antenna chromomophores to the en…
The hydrothermal reaction of manganese dichloride with the potassium salt of benzene-1,3,5-tricarboxylic acid at 220 °C gives [Mn3{C6H3(CO2)3-1,3,5}2] which exhibits two pathways for antiferromagnetic coupling.
Having previously demonstrated the possibility of synthesizing high molecular weight poly(ether imide)s with ortho -linked main-chain units from bis(ether anhydride)s derived from catechol or its derivatives, we now provide a preliminary assessment of the properties of the polymers prepared from the catechol bis(ether…
The structure of (porphinato)nickel(II) [Ni(P)] has been determined by X-ray diffraction and inferred from a combination of single-crystal and solution resonance Raman measurements. The crystal structure reveals a planar porphyrin macrocycle with a π−π dimer packing configuration exhibiting a small lateral shift. This…
Barium titanate fine particles were prepared by a hydrothermal method using titanium tetrahydroxide gel and barium hydroxide. In particles with an average size of 89.62nm, the crystal structure changed from cubic to tetragonal accompanied with a decrease in the amount of lattice defects such as lattice hydroxyl groups…
The phase behavior of ABA triblock copolymers in aqueous solutions is studied theoretically, using both continuum and lattice mean-field theories. A variety of lyotropic liquid crystalline phases is found for the Pluronic family, and the effects of temperature, copolymer concentration, overall molecular weight, and bl…
We describe a novel approach for Au and Ag colloid monolayer formation on different silicon oxide surfaces such as glass, silicon, and ITO. The preparation method is simple and yields monolayers with easily controlled spacing within the monolayer without aggregation of metal particles. The colloid monolayers are prepa…
The liquid-crystal templating approach for the synthesis of mesostructured materials was extended to aluminophosphates. A variety of lamellar AlPO 4 phases with d spacings in the nanometer range were prepared in the presence of long-chain primary and tertiary amines. A systematic study of the influence of the gel comp…
Organic−inorganic interpenetrating polymer networks were synthesized with an SiO 2 phase made by sol−gel chemistry and the organic phase made from poly(2-hydroxyethyl acrylate). The resultant morphologies were characterized by small-angle scattering and electron microscopy. When the vinyl polymerization is more rapid…
The design, structure, and properties of supramolecular liquid-crystalline side-chain polymers are described. In particular, we show how several simple H-bonding building blocks can be used for the formation of various liquid-crystalline structures. Poly[4-(6-(acryloyloxy)hexyl- and -undecyloxy)benzoic acid] (P m OBA;…
The importance of appropriate chemical substitution in generating co-crystals of some dinitrobenzoic acids and anthracene from solution and by solid-state grinding is discussed.
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTFacile Preparation of Face Differentiated, Chiral 15-Metallacrown-5 ComplexesAnn J. Stemmler, Almut Barwinski, Michael J. Baldwin, Victor Young, and Vincent L. PecoraroView Author Information Departments of Chemistry The University of Michigan Ann Arbor, Michigan 48109…
Highly organized monolayers formed from the self-assembly of octadecyl derivatives on oxide-covered Si and Ti substrates have been exposed to electron beam impact under typical conditions used in lithographic patterning. A combination of X-ray photoelectron spectroscopy, ellipsometry, infrared spectroscopy, and liquid…