Materials Literature
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By using the field effect (through-space charge-dipole or dipole−dipole interactions), efficient ketone catalysts 7 and 10 were developed for in situ epoxidation of olefins with Oxone. With either ketone 7 (10−20 mol %) or 10 (5−10 mol %) as catalyst, epoxidation of various olefins (2 mmol scale) at room temperature w…
We present a quantitative comparison between extensive Monte Carlo simulations and self-consistent field calculations on the phase diagram and wetting behavior of a symmetric, binary (AB) polymer blend confined into a film. The flat walls attract one component via a short-range interaction. The repulsion between monom…
α-RuCl3 is a new host for polymer intercalation using an in situ redox intercalative polymerization recaction. With the aid of ambient oxygen, aniline molecules get oxidatively polymerized by the Ru3+ centers of the inorganic host and enter the two-dimensional galleries. An electrically conductive lamellar nanocomposi…
Twenty-six poly(oxyethylene)-poly(oxybutylene) diblock copolymers were prepared by anionic polymerization. The phase behavior of these copolymers was studied near the order−disorder transition over the composition range from 0.21 to 0.84 poly(oxyethylene) volume fraction. Small-angle X-ray scattering was used to chara…
The sonolytic degradation of ozone (O 3 ) was investigated in both closed and open continuous-flow systems to examine effects of mass transfer on chemical reactivity in the presence of ultrasound. Degradation of O 3 followed apparent first-order kinetics at frequencies of both 20 and 500 kHz in all the systems. Degass…
The preparation, crystal structures, and variable temperature magnetic susceptibility data are presented for two azido-bridged Schiff base complexes of Mn(III) and Fe(III). Mn(salpn)N(3) (1), where salpn is the dianion of N,N'-bis(salicylidene)-1,3-diaminopropane, crystallizes in the orthorhombic system, space group P…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTInvestigation of Brill Transition in Nylon 6 and Nylon 6,6 by Infrared SpectroscopyNadarajah Vasanthan, N. Sanjeeva Murthy, and Robert G. BrayView Author Information Engineered Material Sector Laboratories, AlliedSignal Inc., Morris…
We study a scalar lattice model for inter-grain forces in static, non-cohesive, granular materials, obtaining two primary results. (i) The applied stress as a function of overall strain shows a power law dependence with a nontrivial exponent, which moreover varies with system geometry. (ii) Probability distributions f…
Powder X-ray diffraction (XRD), 29 Si magic-angle-spinning (MAS) NMR spectroscopy, and transmission electron microscopy (TEM) as well as N 2 adsorption have been employed to study the formation of various mesophases that lead to the synthesis of cubic mesoporous MCM-48 molecular sieve. A typical synthesis is performed…
Experimental solubilities are reported for anthracene dissolved in ternary 1-propanol + 1-butanol + 2,2,4-trimethylpentane, 1-propanol + 2-butanol + 2,2,4-trimethylpentane, 2-propanol + 1-butanol + 2,2,4-trimethylpentane, and 2-propanol + 2-butanol + 2,2,4-trimethylpentane solvent mixtures at 25 °C. Nineteen compositi…
Palladium and platinum(II) complexes [MX 2 {C⋮NC 6 H 2 (3,4,5-OC n H 2 n +1 ) 3 } 2 ] (X = Cl, Br, I; n = 4, 6, 8, 10, 12) have been prepared. The free isocyanides are not liquid crystals, but most of their complexes [MX 2 {C⋮NC 6 H 2 (3,4,5-OC n H 2 n +1 ) 3 } 2 ] (M = Pd, Pt; X = Cl, Br, I) show hexagonal columnar p…
Three types of polyphosphazenes with different architectures have been synthesized and characterized. The influence of the polymer architecture on solid ionic conductivity was of particular interest. The first type includes linear oligo- and polyphosphazenes with the general formula [N P(OCH 2 CH 2 OCH 2 CH 2 OCH 3 )…
Noncovalent face-to-face heterodimers and -trimers between beta-tetracationic and meso-tetraanionic manganese(III) porphyrins have been prepared in bulk water at pH 12. They are held together by Coulomb interactions between four beta-methylpyridinium and meso-phenylsulfonate or meso-phenylcarboxylate ion pairs in ecli…
Soluble alkyl ( II, 8a,b ), fluoroalkyl ( 4a ), and fluoroalkoxy ( 4b,c, 8c ) 1,(4)- or 2,(3)-substituted phthalocyaninato- and linear 2,(3)- and angular 1,(2)-annulated naphthalocyaninatotitanium(IV) oxides 10, 12, and 14 were synthesized and characterized with regard to their spectroscopic, photophysical, and photoc…
The issue “Do trivalent cations conduct in crystalline solids or not?” appears in the basic research of solid-state chemistry and deals with the characteristics and properties of a multivalent cationic current transport through a solid material. Cations in an oxidation state higher than two are not unanimously accepte…
The Fe-O and Fe-N bond lengths at two iron sites of the mixed-valence complex [Fe(3)O(OOCC(CH(3))(3))(6)(C(5)H(5)N)(3)] show a pronounced temperature dependence; the bonds from two of the Fe atoms to the central oxygen atoms vary by more than 0.10 Å on cooling to 10 K whereas the bond from the third iron atom is essen…
Films were prepared by casting alkaline solutions of gliadin, a major wheat storage protein fraction. Their compositions and mechanical and surface properties were analyzed. Five polyols of the ethylene glycol series and glycerol were compared as plasticizers. The plasticized film-forming solutions exhibited viscositi…
Complex transition-metal hydrides provide new opportunities for hydrogen storage. Their hydrogen-to-metal ratios reach values of up to H/M = 4.5 (BaReH9) and thus surpass the hydrogen-to-carbon ratios of hydrocarbons (methane: H/C = 4); their hydrogen-volume efficiencies exceed that of liquid hydrogen by a factor of u…
A method for parametrizing the A cation size disparity or mismatch in ATO 3 perovskites through the A cation size variance has recently been proposed and experimental studies are reviewed. (A is a mixture of trivalent lanthanide and divalent alkaline-earth cations.) The metal−insulator transition temperature in AMnO 3…
Early stages of crystallization of polymers may be viewed as physical gelation. This is shown with four commercial isotactic polypropylenes, which have been studied by dynamic mechanical experiments at low degrees of undercooling, Δ T = 10−26 K, below their nominal melting temperature. The physical gel point is manife…