Materials Literature
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We have correlated the Raman intensities of out-of-plane modes of nickel porphyrins with the nonplanar deformations of specific symmetries, i.e., static normal coordinate deformations (SNCDs) expressed in terms of irreducible representations of the unperturbed D(4h) point group. The model porphyrins Ni(II) octaethylte…
Two new chiral liquid crystals containing a well-known mesogenic cholesteryl group and an azobenzene moiety connected with a short flexible carbonyldioxy spacer and a polar carbonyl unit in a terminal chain were designed and synthesized. A sequence of very interesting mesophases were observed. Their reversible photore…
Organic−inorganic hybrids containing exfoliated nanosheets with a perovskite-related structure have been prepared from an n -decoxy derivative of an ion-exchangeable layered perovskite, HLaNb 2 O 7 · x H 2 O (HLaNb) or HCa 2 Nb 3 O 10 · x H 2 O (HCaNb), silanol-terminated poly(dimethylsiloxane) (PDMS), and tetramethox…
A computational search for low-energy crystal structures of 5-fluorocytosine was performed in conjunction with a manual crystallization screen to determine whether solid forms other than the known monohydrate structure could be discovered. The predicted low-energy structures were based on a hydrogen-bonded ribbon, whi…
Polyelectrolyte multilayer capsule reactors (PEMCRs) for the synthesis of two types of nanoparticles were prepared. The tunable PEMCRs containing two different functional groups that can be used to synthesize two types of nanoparticles simultaneously and to control the composition of two types of nanoparticles within…
This work emphasizes the important role of the synthetic parameters in the structure of the polymeric material obtained in the aniline polymerization. The polymers formed by the oxidative polymerization of aniline by copper(II) ions in acidic aqueous solution, acetonitrile/water medium, and also copper(II) acetate com…
We report on the synthesis, structural characterization, physical properties, and lasing action of two organic dyes, Rhodamine 6G (Rh6G) and Pyrromethene 597 (PM597), incorporated into new hybrid organic-inorganic materials, where the organic component was either poly(2-hydroxyethyl-methacrylate) (PHEMA) or copolymers…
Abstract Single-walled carbon nanotubes (SWNTs) were well dispersed in both water and organic solvent by the use of fullerodendron as a dispersant. A C60 moiety at the focal point of dendron plays a crucial role in the dispersing process, because dendron having an anthracene unit at the focal point can not disperse SW…
A study of the process−property−performance relationship of a Bristol-Myers Squibb drug substance led to successful development of crystallization and drying processes that produce crystals with desired and consistent physical properties. A controlled crystallization technique was developed to obtain well-defined, lar…
ADVERTISEMENT RETURN TO ISSUEPREVLetterNEXTOptical Spectroscopy on Individual amphi-PIC J-AggregatesErwin Lang, Alexander Sorokin, Markus Drechsler, Yuri V. Malyukin, and Jürgen KöhlerView Author Information Experimental Physics IV and BIMF, University of Bayreuth, 95440 Bayreuth, Germany, Department of Nanocrystal Ma…
ADVERTISEMENT RETURN TO ISSUEPREVNoteStereoselective Controlled Polymerization of dl-Lactide with [Ti(trisphenolate)O-i-Pr]2 InitiatorsSarah K. Russell, Carolyn L. Gamble, Karen J. Gibbins, Kirsten C. S. Juhl, William S. Mitchell, Aistis J. Tumas, and Gretchen E. HofmeisterView Author Information Department of Chemist…
[structure: see text] A vinylene-linked porphyrin dimer, with no substituents at the beta-positions, has been synthesized by CuI/CsF promoted Stille coupling. In the crystal structure of this dimer, the C(2)H(2) bridge is twisted by 45 degrees relative to the plane of the porphyrins. The absorption, emission spectra,…
Cagelike polymer microspheres were synthesized by self-assembly of latex particles at the monomer droplets interface. The swelling of the latex particles by the monomer provided a driving force to develop a hollow core. The latex particles were also used as porogen that would disengage automatically during polymerizat…
We report here the formation and dynamic mechanical properties of metallo-supramolecular networks formed by mixtures of bis-Pd(II) and Pt(II) cross-linkers with poly(4-vinylpyridine) in DMSO. Precise control over the dynamic mechanical properties of the bulk materials is achieved through the dissociation kinetics of t…
The 6-cobalt-substituted [{Co3(B-beta-SiW9O33(OH))(B-beta-SiW8O29(OH)2)}2]22- has been characterized by IR and UV-vis spectroscopy, elemental analysis, magnetic studies, electrochemistry, and gel filtration chromatography. A single-crystal X-ray analysis was carried out on K10Na12[{Co3(B-beta-SiW9O33(OH))(B-beta-SiW8O…
First-principles, density-functional based electronic structure calculations are carried out for MgC(Ni_{1-x}Co_{x})_{3} alloys over the concentration range 0\leq x\leq1, using Korringa-Kohn-Rostoker coherent-potential approximation (KKR CPA) method in the atomic sphere approximation (ASA). The self-consistent calcula…
Ground state of the quantum Jahn-Teller model with broken rotational symmetry was investigated by the variational approach in two cases: a lattice and a local ones. Both cases differ by the way of accounting for the nonlinearity hidden in the reflection-symmetric Hamiltonian. In spite of that the ground state energy i…
Coating of surfaces by RGD peptides is well-known. Herein we describe the possibility to switch cell adhesion properties by changing the distance and orientation of the RGD peptides to the surface. A set of RGD peptides of the type cyclo(-RGDfK-) was synthesized containing the photoswitchable 4-[(4-aminophenyl)azo]ben…
The increasing use of nanotechnology in consumer products and medical applications underlies the importance of understanding its potential toxic effects to people and the environment. Although both fullerene and carbon nanotubes have been demonstrated to accumulate to cytotoxic levels within organs of various animal m…
The structural properties of an ultrathin (3 nm) Si layer sandwiched between two thin SiO 2 layers subjected to thermal annealing have been investigated by energy filtered transmission electron microscopy (EFTEM). It has been demonstrated that the first stages of the thermal evolution of the Si layer involve the forma…