Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of surface properties of clay laponite using pyrene as a photophysical probe moleculeXinsheng Liu and J. Kerry ThomasCite this: Langmuir 1991, 7, 11, 2808–2816Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 Nov…
Disk-like complexes, bis[l,2-di(3′,4′-di-n-alkylphenyl)ethane-l,2-dithiolene]nickel (n-alkyl = n-hexyl, n-octyl) and bis[1,2-di(3′,4′-di-n-decyloxyphenyl)ethane-1,2-dithiolene]nickel have been synthesized and characterized. It was found that n-decyloxy derivative exhibits a hexagonal disordered columnar (Dhd) mesophas…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSingle-crystal x-ray studies of aromatic oligomers: conformation and packing in isomeric pyromellitimide-ether-sulfonesCaroline A. O'Mahoney, David J. Williams, Howard M. Colquhoun, Richard Mayo, Stella M. Young, Ali Askari, John Kendrick, and Elizabeth RobsonCite this: Macr…
A series of bis(arene)technetium(I) complexes has been synthesized from 99mTcO4- in order to study their organ distribution. Syntheses using either ultrasound/Al/AlCl3 or Zn/HCl gave products relatively free from transalkylation. The identity of the complexes was verified by comparison to the 99Tc complexes. Equivalen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemistry of five- and six-coordinate .sigma.-bonded cobalt porphyrins. Reactions of (TPP)Co(C2H5)(py) and (TPP)Co(R) where TPP is the dianion of tetraphenylporphyrin and R = CH3, C2H5, or CH2ClK. M. Kadish, B. C. Han, and A. EndoCite this: Inorg. Chem. 1991, 30, 24,…
SUMMARY This paper discusses some methods for the quantitative description of anisotropy of planar structures. These methods can be applied to systems of particles randomly distributed. It is also possible to detect anisotropics in particle arrangements. Finally, a simple Monte Carlo test of an isotropy hypothesis is…
Films of a range of phthalocyanines which had been deposited by vacuum sublimation were analysed using X-ray photoelectron spectroscopy (XPS). Spectra of the major peaks were recorded before exposure to NOX (NO 2 +N 2 O 4 ), after exposure to 9 vpm NOX in air, after exposure to undiluted NOX and finally after heating…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTApplication of the molecular simulation technique to generate the structure of an aromatic polysulfone systemCun Feng Fan and Shaw Ling HsuCite this: Macromolecules 1991, 24, 23, 6244–6249Publication Date (Print):November 1, 1991Publication History Published online1 May 2002…
A thorough understanding of the structure physical/mechanical properties of the polymers has made possible the molecular design of macromolecules for specific application needs. Several methods exist for polymer synthesis and processing. When it concerns homopolymers, each polymer structure is identified with a partic…
Films of palladium acetate Pd(OOCH3)2 0.1 and 0.3 μm thick have been stoichiometrically altered through exposure to electron beams of 1–30 keV. The lowest required doses for alteration, 1000 and 2500 μC/cm2, were obtained using beam energies of 4 and 5 keV, respectively. These results have been related to Monte Carlo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDependence of complex structure on ligand conformation in palladium(II) complexes of the crown thioether ligands 2,5,8-trithia[9]-o-benzenophane (TT[9]OB) and 2,5,8-trithia[9]-m-benzenophane (TT[9]MB). Structures of PdCl2(TT[9]OB).cntdot.DMSO and PdCl2(TT[9]MB)Broer De Groot…
Identification of corrosion products on non-ferrous metal artifacts recovered from historic shipwrecks off the coast of Western Australia has provided conservators with useful information regarding the nature of the degradation processes on copper, brass, bronze, silver, lead and pewter artifacts. Analysis of the diff…
Surface-Enhanced Raman Spectroscopy (SERS) has been used to characterize nucleic acid compounds—such as free bases, mononucleotides, and dinucleotides—to study the viability of the technique to analyze mixtures of the various compounds and to see whether the SERS properties of the dinucleotides are sequence dependent.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh coverages and subsurface penetration of oxygen on ruthenium(001)Igor J. Malik and Jan HrbekCite this: J. Phys. Chem. 1991, 95, 24, 10188–10190Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 November 1991https://…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe concept of geometrical rigidity around a transition-metal center, a significant factor in improving thermal stability for .sigma.-alkyl transition-metal complexesLian Zhang and Krister ZetterbergCite this: Organometallics 1991, 10, 11, 3806–3813Publication Date (Print):N…
Around a sodium atom template the spherically shaped shell of the dodecameric organotin–oxygen cation of the title compound assembles. (See polyhedral representation, right; the black dots symbolize isopropyl groups.) The [Ag7I11] anion of this novel inorganic host–guest complex is also quite remarkable. It is a one-d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structural and spectroscopic studies of manganese complexes of pendant-arm macrocycles based on 1,4,7-triazacyclononane: crystal structures of the manganese(II) complex [MnLH3][MnCl4] and of the mixed-valence manganese(II)-manganese(IV) hydrogen-bridged dimer […
Abstract Difunctional hydroxy‐terminated poly(ε‐caprolactone‐co‐ε‐valerolactone) (PCV) oligomers were synthesized by the diol‐initiated bulk copolymerization of ε‐caprolactone (C) and δ‐valerolactone (V). The two homopolymers were semicrystalline, with almost identical melting temperatures; copolymerization significan…
Abstract We have studied the migration of the hindered phenol, octadecyl‐3,5‐bis (1,1‐dimethylethyl)‐4‐hydroxybenzenepropanoate, and the phosphite co‐stabilizer tris 2,4‐bis(1,1‐dimethylethyl)phenylphosphite, out of films of polypropylene (nominal melt flow 3.5 g/10 min). Loss of additive from an initial 10% weight‐%…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSinglet oxygen mediated oxidative decarboxylation of pyrrole-2-carboxylic acidsDale L. Boger and Carmen M. BaldinoCite this: J. Org. Chem. 1991, 56, 24, 6942–6944Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 Novemb…