Ferroelectric liquid crystals for second order nonlinear optics
Abstract
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Photoinduced alignment behavior of polymer liquid crystals containing azobenzene moieties in the side chain
Abstract
Expanded porphyrins. Synthetic materials with potential medical utility
Abstract
Mesoporous Magnetic Materials Based on Rare Earth Oxides
A novel family of mesoporous oxides of rare earth metals (Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu) were synthesized with specific surface areas of 253-348 m(2) g(-1) and pore diameters of 2.5-3.0 nm (see Scheme). The mesoporous solids and their surfactant mesophase precursors are paramagnetic and exhibit a magnetic anomaly due…
Phthalocyanine thin films
Abstract
Self-Assembly of a Radially Functionalized Hexagonal Molecule: Hexakis(4-hydroxyphenyl)benzene
Two different porous hydrogen-bonded networks are formed by self-assembly of the radially substituted host 1. In the network of type A, formed by 1 small middle dot4 Et(2)O, all OH groups of 1 are involved in hydrogen bonding, and the molecular sheets are stacked without translation to generate extended channels that…
Using Liquid Crystals To Image Reactants and Products of Acid−Base Reactions on Surfaces with Micrometer Resolution
We report that nematic liquid crystals (LCs) of 4-cyano-4‘-pentylbiphenyl (5CB) and p -methoxybenzylidene- p - n -butylaniline (MBBA) can be used to image reactants and products of reversible, acid−base reactions on surfaces with micrometer resolution. When supported on obliquely deposited films of gold, azimuthal ori…
Enantioselective Single-Crystal-to-Single-Crystal Photodimerization of Coumarin and Thiocoumarin in Inclusion Complexes with Chiral Host Compounds
An intermolecular enantioselective photoreaction by a single-crystal-to-single-crystal transformation has been carried out for the first time, as is evident from X-ray structure analysis and X-ray powder diffractometric studies. This reaction, the dimerization of the title compound to cyclobutane derivative 1 (X=O, S)…
Molecular Magnetic Sponges
Reversible release or reabsorption of water like sponges, a process which is accompanied by a dramatic change of structure and magnetic properties, can be achieved by some molecular magnetic materials. When the sponges are hydrated, or wet, the structure consists of isolated units with a nonmagnetic ground state. When…
Chlorine adsorption on the Cu(111) surface
We investigate the adsorption of chlorine on the Cu(111) surface with full potential all-electron density functional calculations. Chlorine adsorption at the fcc hollow sites is slightly preferred over that at the hcp hollow. The adsorption geometry is in excellent agreement with electron diffraction and ion scatterin…
Wannier-functions characterization of floating bonds in a-Si
We investigate the electronic structure of over-coordinated defects in amorphous silicon via density-functional total-energy calculations, with the aim of understanding the relationship between topological and electronic properties on a microscopic scale. Maximally-localized Wannier functions are computed in order to…
Acid Doping of Polyaniline: Spectroscopic and Electrochemical Studies
A detailed investigation of the acid doping behavior of polyaniline has led to a robust and reproducible procedure for controlled adjustment of the redox state of dry polyaniline films. The initial step in this procedure is the casting of PANI films from formic acid. The subsequent exchange of the trapped formic acid…
Molecular Nanocapsules Based on Amphiphilic Hyperbranched Polyglycerols
Polar dyes can be solubilized in apolar media—molecular nanocapsules with hydrophilic interiors have been prepared (see schematic representation) using polyglycerols with narrow polydispersity and simple esterification with fatty acids. These unimolecular micelles offer attractive potential for a variety of applicatio…
Cooperative Self-Assembly of Double-Strand Conjugated Porphyrin Ladders
A series of conjugated zinc porphyrin oligomers, from the dimer through to the hexamer, form stable ladder complexes with linear bidentate ligands such as 1,4-diazabicyclo[2.2.2]octane (DABCO) and 4,4‘-bipyridyl (Bipy). The 1 H NMR spectra of these ladders confirm their structures and show how they fray and dissociate…
Phosphorescent materials for application to organic light emitting devices
Abstract
Self-Induced Kinetic Roughening of Dislocations in the Vicinity of First-Order Phase Transitions
The glide motion of a dislocation line is considered in a crystal undergoing a first-order phase transition. Within the hysteresis temperature range a trail of a metastable phase can nucleate at the dislocation and act as a dry-friction force. The strength of this force depends on the angle between the Burgers vector…
REE-bearing sector-zoned lawsonite in the Sanbagawa pelitic schists of the eastern Kii Peninsula, central Japan
Rare-earth elements (REE)-bearing sector-zoned lawsonite was found in Sanbagawa pelitic schists in the Ise area of the eastern Kii Peninsula, central Japan. The pelitic schists consist mainly of lawsonite, chlorite, phengite, titanite, albite, quartz, calcite and weakly-ordered graphite. Metamorphic conditions are est…
Hydrogen stability in diamond-like carbon films during wear tests
Hydrogen stability has been investigated during wear tests in particular diamond-like carbon films deposited in a dual electron cyclotron resonance radio frequency glow discharge plasma system, at two different substrate bias voltages equal to −30 and −600 V, for series I and series II, respectively. Combined infrared…
Lead-antimony sulfosalts from Tuscany (Italy). I. Scainiite, Pb14Sb30S54O5, the first Pb-Sb oxy-sulfosalt, from Buca della Vena mine
The new mineral scainiite, Pb 14 Sb 30 S 54 O 5 , the first lead oxy-sulfosalt, has been found at Buca della Vena mine in the Apuan Alpes, northern Tuscany, Italy. Scainiite occurs as black acicular crystals with bluish metallic lustre, elongated [010], up to 2 mm long and 0.2 mm thick. The mineral is brittle, opaque;…
Structural Relaxation of Dense Suspensions of Soft Giant Micelles
The dynamics of liquid-like ordered giant colloidal micelles in the wave vector range around the peak of the structure factor is explored using photon correlation spectroscopy. No thermodynamic slowing down of the collective density fluctuations is found, whereas the long-time diffusion coefficient follows the concent…