Materials Literature
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Ethlene preferentially attacks the oxygen closest to the titanium in HOO–Ti(OSiH3)3(MeOH) and HOO–TiL3(MeOH) cluster models of the active Ti-site in TS1 due to a substantially reduced electrostatic repulsion.
The magnetic behavior of the clusters [(PhSiO(2))(6)Cu(6)(O(2)SiPh)(6)].6EtOH (1), Na(4)[(PhSiO(2))(12)Cu(4)].8(n)()BuOH (2), and K(4)[(C(2)H(3)SiO(2))(12)Cu(4)].6(n)()BuOH (3) has been investigated by combined magnetic susceptibility measurements and variable-temperature EPR techniques (9.25 and 245 GHz). The six cop…
A systematic study of the properties and reactivities of iron(III) porphyrin peroxo complexes containing ligands with different electronic properties has been undertaken. While the spectral properties of the peroxo complexes do not show much variation, the stability of the complexes is dramatically increased by employ…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTHeterocyclic Betaines Exhibiting Extremely Large First Hyperpolarizability: Ab Initio and INDO/S CalculationsJiro Abe and Yasuo ShiraiView Author Information Department of Photo-Optical Engineering Faculty of Engineering, Tokyo Institute of Polytechnics Iiyama 1583, At…
A number of cationic chromophores derived from the stilbazolium skeleton have been synthesized and inserted into the transparent layered MPS 3 compounds (M = Mn, Cd, Zn). The NLO properties of the intercalates have been studied. Some of the materials are found to be active for second harmonic generation. UV−visible sp…
The nonresonance Raman spectrum of free base porphine has been measured using near infrared excitation. The observed frequencies and intensities are compared with results from the scaled quantum mechanical (SQM) force field presented in part I. The SQM force field is based on density functional calculations, scaled to…
In this study we attempted to develop a novel drug delivery system in the form of polymeric micelles. In order to obtain polymer chains with micelle forming abilities, we have proposed to produce copolymers by transesterification of poly(DL-lactic acid)(PDLLA)(as the hydrophobic segment) and polyethylene glycol (PEG)…
Samples of silicalite-1 with vanadium ions incorporated in stable framework positions (KVS-5) have been synthesized using several different compounds of V. The materials were investigated by XRD, chemical analysis and SEM–EPM techniques and UV–VIS, EPR, NMR, IR and Raman spectroscopy. One group of the samples containe…
We have measured the pressure dependence of the order−disorder transition temperature ( T ODT ) in two styrene−isoprene diblock copolymers containing 24 and 48 wt % styrene ( M w = 20 500 and 16 500 g mol -1, respectively). Small-angle X-ray scattering measurements indicate that T ODT rises linearly with increasing hy…
The strengthening of the interface between polystyrene (PS) and poly(methyl methacrylate) (PMMA) using a random copolymer P(S f - r -MMA 1 - f ), where f is the fraction of styrene in the copolymer, was investigated. The maximal fracture toughness, measured by crack propagation, was found when f = 0.68. Neutron reflec…
Plasma polymers of acrylic (propenoic) acid and propanoic acid were prepared from inductively coupled, radio-frequency-induced plasmas excited in vapors of the starting materials. The plasma polymers were characterized by X-ray photoelectron spectroscopy (XPS), infrared reflection absorption spectroscopy (IRAS), and s…
In this paper, a macro-scale, phenomenological constitutive model for shape memory alloys is used in conjunction with energy balance equations to study the evolution of temperature and deformation profiles seen in SMA wires under specific thermal and mechanical boundary conditions. The general, fully coupled thermo-me…
Trivalent polyhedra with six square and (x– 4) hexagonal faces are candidates for fully alternating (BN)x‘inorganic fullerene’ cages. Systematic density-functional tight-binding calculations for 4 ⩽x⩽ 30 show that the most stable isomer of this type will have isolated squares, whenever mathematically possible. This ru…
In the absence of crystals of suitable quality, the crystal structures of five [MX2(bipy)](M = Ni or Cu; X = Cl or Br; bipy = 4,4′-bipyridyl) phases were determined, ab initio, from powder diffraction data. The nickel compounds contain symmetrically bridging halides and trans-D4h octahedrally co-ordinated metal atoms;…
The region of the (Na1/2Bi1/2)1−xPbxTiO3 phase diagram from 0≤x≤0.2 was established through analysis of structure and thermal anomalies associated with changes in temperature and composition. The rhombohedral-tetragonal morphotropic phase boundary (MPB) was investigated considering the dependence of the rhombohedral l…
A novel family of silica-based mesoporous molecular sieve M41S was synthesized by one of the Mobil research groups. Surfactant molecules were mixed with a silica solution, resulting in a regular array of uniform mesopores, 2−10 nm in diameter, capable of acting as a potential catalyst. The final long-range ordering of…
Magnetic and electrochemical interactions between two redox-active, paramagnetic {Mo(Tp*)(NO)Cl} fragments [Tp* = tris(3,5-dimethylpyrazolyl)hydroborate] attached to either end of various bis(pyridyl) bridging ligands may be related to the substitution pattern, conformation, length, and symmetry of the bridge. The sig…
Several unsymmetrically substituted TTFs bearing the S(CH2)2CN protecting group have been prepared by standard cross coupling in triethyl phosphite from the key intermediate 4,5-bis(2′-cyanoethylsulfanyl)1,3-dithiol-2-one 1 and an appropriate 1,3-dichalcogenole-2-chalcogenone, 2–8. TTFs 10, 11 and 12 of type I have be…
The stability of weakly flocculated, nonaqueous suspensions of aluminum oxide with adsorbed poly(methyl methacrylate) (PMMA) layers as a function of nonadsorbed PMMA volume fraction was studied through rheological measurements and optical microscopy. In the absence of nonadsorbed polymer, suspensions exhibited strong…
Both discharge capacity and charge–discharge cycle life of MgNi negative electrodes prepared by mechanical alloying (MA) are greatly improved by surface modification with graphite using a planetary mill.