New materials by sol–gel processing: design at the molecular level
U. Schubert, J. Chem. Soc., Dalton Trans., 1996, 3343 DOI: 10.1039/DT9960003343
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Cluster Models of Cu Binding and CO and NO Adsorption in Cu-Exchanged Zeolites
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…
Redox Behavior of CuZSM-5 Catalysts: FTIR Investigations of Reactions of Adsorbed NO and CO
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…
Multichromophoric Cyclodextrins. 4. Light Conversion by Antenna Effect
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…
Engineering coordination architecture by hydrothermal synthesis; preparation, X-ray crystal structure and magnetic behaviour of the coordination solid [Mn3{C6H3(CO2)3-1,3,5}2]
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.
Melt-Processable Poly(ether imide)s Based on Catechol Bis(ether anhydride)
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…
Planar Solid-State and Solution Structures of (Porphinato)nickel(II) As Determined by X-ray Diffraction and Resonance Raman Spectroscopy
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…
Role of Lattice Defects in the Size Effect of Barium Titanate Fine Particles
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…
Theory of Phase Behavior of Poly(oxyethylene)−Poly(oxypropylene)−Poly(oxyethylene) Triblock Copolymers in Aqueous Solutions
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…
Dendrimer-Modified Silicon Oxide Surfaces as Platforms for the Deposition of Gold and Silver Colloid Monolayers: Preparation Method, Characterization, and Correlation between Microstructure and Optical Properties
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…
Synthesis of Mesostructured Lamellar Aluminophosphates Using Supramolecular Templates
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…
Synthesis of Hybrid Organic−Inorganic Materials from Interpenetrating Polymer Network Chemistry
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…
Structures and Properties of Supramolecular Liquid-Crystalline Side-Chain Polymers Built through Intermolecular Hydrogen Bonds
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;…
Creation of crystalline supramolecular arrays: a comparison of co-crystal formation from solution and by solid-state grinding
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.
Facile Preparation of Face Differentiated, Chiral 15-Metallacrown-5 Complexes
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…
Electron-Beam-Induced Damage in Self-Assembled Monolayers
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…
The First Series of Luminescent (μ4-Chalcogenido)silver(I) Clusters
A novel class of tetranuclear silver(I) clusters containing an unsubstituted quadruply bridging chalcogenide, [Ag4(μ-dppm)4(μ4-E)](OTf)2 [E = S (1), Se (2), Te (3)], have been synthesized and characterized by X-ray crystallography. The clusters have been shown to possess rich photophysical properties. It is suggested…
Novel Chiral Bis-dipolar 6,6‘-Disubstituted Binaphthol Derivatives for Second-Order Nonlinear Optics: Synthesis and Linear and Nonlinear Optical Properties
A number of thermally and optically stable, bis-dipolar chiral molecules based on two geometries of the binaphthol (BN) system with different acceptors/substituents have been synthesized for the first time, and the synthetic routes are reported: optically pure 6,6‘-disubstituted 2,2‘-diethoxy-1,1‘-binaphthyls {R, R‘=…
Femtosecond Dynamics of a Thiophene Oligomer with a Photoswitch by Transient Absorption Spectroscopy
Femtosecond dynamics of the photochromic reaction of a thiophene oligomer with a diarylethene structure in solution was analyzed by transient absorption spectroscopy. It was found that the intermediate species with an absorption maximum at ∼515 nm was formed within 100 fs and that the closed-ring form of the thiophene…
Enzymatic Degradation of Bacterial Poly(3-hydroxybutyrate) by a Depolymerase from Pseudomonas lemoignei
Extracellular poly(3-hydroxybutyrate)(PHB)-depolymerases A and B were purified from the culture medium of succinate-grown cells of Pseudomonas lemoignei by ammonium sulfate precipitation and chromatography on CM Sepharose CL-6B. The relative molecular weights of the sodium dodecyl sulfate (SDS)-treated enzymes were es…