Materials Literature
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Explosive in the solid state, the bis(η2-peroxo) complex 1, which in solution is the active species in the epoxidation of olefins with [CH3ReO3], could be characterized by X-ray crystallography as the diglyme adduct 2. Under catalytic conditions (excess of H2O2), 1 is far more stable than in the free state.
Silicon nitride materials typically reveal thin amorphous intergranular films along grain boundaries, with only the exception of special boundaries. It is known that such grainboundary films strongly affect the high‐temperature properties of the bulk material. High‐resolution electron microscopy (HREM) was used to stu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBuilding-block synthesis of porphyrin light-harvesting arraysSreedharan Prathapan, Thomas E. Johnson, and Jonathan S. LindseyCite this: J. Am. Chem. Soc. 1993, 115, 16, 7519–7520Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Published in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMonte Carlo studies of dendrimer macromoleculesMarc L. Mansfield and Leonid I. KlushinCite this: Macromolecules 1993, 26, 16, 4262–4268Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Published inissue 1 August 1993https://pubs.acs.org/doi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAll-aromatic hyperbranched polyesters with phenol and acetate end groups: synthesis and characterizationS. Richard Turner, Brigitte I. Voit, and Thomas H. MoureyCite this: Macromolecules 1993, 26, 17, 4617–4623Publication Date (Print):August 1, 1993Publication History Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, molecular structure, and reactivity of (alkylperoxo)copper(II) complexNobumasa Kitajima, Tsutomu Katayama, Kiyoshi Fujisawa, Yusaku Iwata, and Yoshihiko MorookaCite this: J. Am. Chem. Soc. 1993, 115, 17, 7872–7873Publication Date (Print):August 1, 1993Publication…
Abstract New classes of polymers and oligomers whose backbone consists of a network of delocalized π electrons have recently been synthesized and show electrical and non‐linear optical properties of great interest for new technologies. The vibrational spectra of these materials show peculiar features which, if properl…
This paper undertakes a parallel analysis of the gelation mechanisms, structure and rheological properties of gelatin and collagen gels. Although the molecular compositions of collagen and gelatin are almost identical, gelation proceeds from distinct mechanisms and leads to different types of molecular assemblies. Fir…
The electron density in synthetic calcite, CaCO3, has been determined using diffraction data for a naturally faced single crystal measured with X-ray Mo Ka (A = 0.71073/~) radiation. Extinction corrections that minimize differences between equivalent reflection intensities are closely approximated by the values which…
A range of nematogenic materials which incorporate a 2,6-disubstituted naphthyl moiety and a terminal cyano-substituent have been synthesized by using palladium-catalysed cross-coupling procedures involving arylboronic acids and alkynylzinc reagents with aryl iodides, bromides and trifluoromethanesulphonates (triflate…
The effects of plasticizers (polyethylene glycols [PEG] 400, 1,450, 8,000 and 20,000, glycerol [G] and propylene glycol [PG]), 30% dry basis, on the physical properties of methylcellulose (MC) films were investigated. With the exception of PG, plasticizers with low molecular weights (G and PEG 400) caused the largest…
An outline is presented of the first commercial environmental scanning electron microscope (ESEM). A concise description of this instrument and its operation, from a user's perspective, is given. More specifically, the description includes the electron optics, pressure stages and control, detection modes, resolution,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicellization of poly(ethylene oxide)-poly(propylene oxide) block copolymers in aqueous solutionPer LinseCite this: Macromolecules 1993, 26, 17, 4437–4449Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Published inissue 1 August 1993https…
Single crystals of PMN have been studied between 10 and 300 K by means of dielectric, polarization and poling/depoling current measurements, associated with optical domain observations under bias field. Evidence for a first order electric field-induced phase transition, from the mean cubic phase to a macroscopically p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, and crystal structures of M(DO3A) (M = iron, gadolinium) and Na[M(DOTA)] (M = Fe, yttrium, Gd)C. Allen Chang, Lynn C. Francesconi, Mary F. Malley, Krishan Kumar, Jack Z. Gougoutas, Michael F. Tweedle, Daniel W. Lee, and Lon J. WilsonCite this: In…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen-bonded liquid crystals. Novel mesogens incorporating nonmesogenic bipyridyl compounds through complexation between hydrogen-bond donor and acceptor moietiesTakashi Kato, Jean M. J. Frechet, Paul G. Wilson, Takeshi Saito, Toshiyuki Uryu, Akira Fujishima, Chihiro Jin,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTitanium isopropoxide as a precursor in atomic layer epitaxy of titanium dioxide thin filmsMikko Ritala, Markku Leskela, Lauri Niinisto, and Pekka HaussaloCite this: Chem. Mater. 1993, 5, 8, 1174–1181Publication Date (Print):August 1, 1993Publication History Published online…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer-layered silicate nanocomposites: in situ intercalative polymerization of .epsilon.-caprolactone in layered silicatesPhillip B. Messersmith and Emmanuel P. GiannelisCite this: Chem. Mater. 1993, 5, 8, 1064–1066Publication Date (Print):August 1, 1993Publication History…
In powder diffraction measurements, the errors in integrated intensities caused by preferred orientation can be corrected by using some suitable analytical model as the representation of the orientation distribution of the crystallites. In this paper, a model based on symmetrized harmonics expansion is described in de…
The surface roughness and nanometer scale structure of Ag films used for surface-enhanced Raman scattering (SERS) are characterized using atomic force microscopy (AFM). Two important types of thin film based SERS-active surface have been examined in this study: (1) Ag island films (AgIF’s) on smooth, insulating substr…