Materials Literature
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The chiral structure of liquid crystalline phases arises due to the intrinsic chirality of the constituent mesogens. While it is seemingly straightforward to quantify the macroscopic chirality by using, for instance, the cholesteric pitch or the optical rotatory power, it is not as simple to quantify the chirality of…
A phosphorus(V) complex of tetra-tert-butylphthalocyanine was prepared. The blue complex showed B and Q bands at 350 and 660 nm with a fluorescence peak at 680 nm in chloroform. In a CV, the complex showed three oxidative and three reductive waves. The following depicted here was tentatively proposed.
The adsorption of H or F species on B vs N atoms on the h-BN (001) surface has been investigated theoretically within the DFT method, using a cluster approach. Only the boron atoms were subjected to a local transformation from hexagonal to cubic phase. It occurred either upon the adsorption of F species or the adsorpt…
The application of surface plasmon resonance (SPR) measurements to the study of ultrathin organic films adsorbed onto gold surfaces utilizing near-infrared (NIR) excitation from a Fourier transform (FT) spectrometer is described. The FT-SPR experiment measures the NIR reflectivity spectrum from a prism/gold film/water…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorToward Molecular Muscles: Design and Synthesis of an Electrically Conducting Poly[cyclooctatetrathiophene]Michael J. Marsella and Rodney J. ReidView Author Information Department of Chemistry, University of California at Riverside, Rive…
A series of homoleptic cations of Rh(I,II), Rh(II), and Rh(III) have been synthesized and characterized in the solid-state and in solution. Three new dinuclear compounds of dirhodium(II,II) were prepared by treatment of Rh 2 (O 2 CCH 3 ) 4 (L) 2 with Et 3 OBF 4 or Me 3 Si(CF 3 SO 3 ) in acetonitrile or propionitrile.…
Molecular nanowires inside single-walled carbon nanotubes are produced by capillary filling. Bismuth was drawn into single-walled carbon nanotubes, where it formed single-crystal nanowires of nanometer dimensions. Metal was introduced in its gas, solution, and solid phases, with the solution phase process the most eff…
Two Laponite clays, of general formula [M n + ] x / n [Li x Mg 6 - x Si 8 O 20 F y (OH) 4 - y ], were prepared with different Li + levels (0.57 and 0.70% w/w) and F - levels (9.5 and 9.9% w/w). The clays were characterized by measurements of nitrogen adsorption isotherms, cation exchange capacity, and conductometric t…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTProgrammed Assembly of DNA Functionalized Quantum DotsGregory P. Mitchell, Chad A. Mirkin, and Robert L. LetsingerView Author Information Department of Chemistry, Northwestern University 2145 Sheridan Rd., Evanston, Illinois 60208 Cite this: J. Am. Chem. Soc. 1999, 121…
A mixture of the 8-O-beta-D-glucopyranoside of omega-hydroxyxanthorin 1-O-methyl ether (3) and the 8-O-beta-D-gentiobioside of xanthorin 1-O-methyl ether (4) was isolated from the water-soluble extractives of the Australian toadstool Dermocybe sp. WAT 22963. Compounds 3 and 4 were identified by characterization of the…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationA Pyropheophorbide Dimer with Single Pyrrole π Overlap and a Low-Energy Q AbsorptionSpencer Knapp, Buwen Huang, Thomas J. Emge, Suzie Sheng, Karsten Krogh-Jespersen, Joseph A. Potenza, and Harvey J. SchugarView Author Information Department of Chemistry RutgersThe State Un…
The two-dimensional phase behavior of mixed-monolayers composed of poly(amidoamine) (PAMAM) dendrimers and n -alkylthiols adsorbed to Au(111) surfaces was studied using tapping mode atomic force microscopy (TM-AFM). Mixed-monolayers were prepared by sequential immersion of Au(111) substrates into ethanolic solutions o…
The influence of stereoregularity of polypropylene on the miscibility with the ethylene−1-hexene copolymer (EHR) whose 1-hexene content is 57 mol % was studied by means of viscoelastic measurements, electron microscopic observation, and so on. In this study, two types of polypropylenes were used; one is an isotactic p…
The mixed-valence diiron centers of nitrosyl derivatives of deoxy hemerythrin have been studied by variable-temperature variable-field Mössbauer spectroscopy. The adduct formed by the reaction of deoxy hemerythrin (deoxyHr) with nitric oxide (deoxyHrNO) produced spectra consistent with a binuclear center of the form F…
Two new conjugated oligoquinolines, 2,2‘-bis(4-phenylquinoline)-1,4-phenylene (2a) and 2,2‘-bis(4-phenylquinoline)-4,4‘-biphenylene (2b), were synthesized and found to crystallize in a monoclinic lattice with different unit cell parameters and space groups. Single-crystal X-ray crystal structures revealed intermolecul…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTIn Situ Observation of a Surface Chemical Reaction by Fast X-Ray Photoelectron SpectroscopyAdam F. Lee, Karen Wilson, Ruth L. Middleton, Alessandro Baraldi, Andrea Goldoni, Giorgio Paolucci, and Richard M. LambertView Author Information Department of Chemistry, Univers…
The paper examines the interaction of a carbon fiber surface, surface-treated by galvanostatic electrochemical oxidation in nitric acid solution, with poly(vinyl alcohol) (PVA). The surface chemistry of the fiber before and after interaction was examined by core and valence band X-ray photoelectron spectroscopy (XPS),…
In this work we study experimentally the lifetime of oil droplets pressed by buoyancy against a large oil/water interface, in a system containing protein (bovine serum albumin). The stability of the drops depends strongly on their size, which can be explained with the hydrodynamics of thinning of the gap region. Two d…
Epitaxial electrodeposition was used to crystallize a 0.5 μm thick film of Cu2O onto single-crystal Au(100) from an alkaline copper lactate solution at room temperature. The film showed strong out-of-plane and in-plane orientation, with no rotation of the respective crystallographic directions of the Cu2O overlayer re…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTEvidence for Sulfur-Based Radicals in Thiolate Compound I IntermediatesMichael T. GreenView Author Information Department of Chemistry and Beckman Institute California Institute of Technology 1200 East California, Pasadena, California 91125 Department of Chemistry and…