Materials Literature
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The isomorphous compounds $({\mathrm{CH}}_{3}{)}_{2}{\mathrm{CHNH}}_{3}{\mathrm{CuCl}}_{3}$ and $({\mathrm{CH}}_{3}{)}_{2}{\mathrm{CHNH}}_{3}{\mathrm{CuBr}}_{3}$ consist of ferromagnetic-antiferromagnetic and antiferromagnetic-antiferromagnetic alternating Heisenberg chains with $S=1/2,$ respectively. The ground state…
The interplay of photochromism and fluorescence was studied by attaching anthracene as chromophore to dithienylperfluorocyclopentene (1,2-bis[5-anthryl-2-methylthien-3-yl]perfluorocyclopentene, Ac-BMTFP). The blue fluorescence of the open isomer of Ac-BMTFP is suppressed by the ring-closure reaction. The spectroscopic…
Synthesis, structure determination by single-crystal X-ray diffraction, and physical properties are reported and compared for superconducting and semiconducting molecular charge-transfer salts with stoichiometry (BEDT-TTF)(4)[A(I)M(III)(C(2)O(4))(3)].PhCN, where A(I) = H(3)O, NH(4), K; M(III) = Cr, Fe, Co, Al; BEDT-TT…
Potassium manganese oxide materials having the synthetic birnessite structure K-OL-1 were synthesized by reduction methods. K-OL-1 has been ion-exchanged with H + to produce H-OL-1, which was utilized in further intercalating reactions. The tetraalkylammonium hydroxides including tetramethylammonium hydroxide, tetraet…
The dehydrogenation of IrH 2 {C 6 H 3 -2,6-(CH 2 PBu t 2 ) 2 } ( 1 ) by tert -butylethylene followed by reaction with an excess of water leads to the isolation of IrH(OH){C 6 H 3 -2,6-(CH 2 PBu t 2 ) 2 } ( 2 ) in nearly quantitative yield. The hydrido hydroxo complex has been characterized by multinuclear NMR spectros…
We report local density functional calculations using the full-potential linearized muffin-tin orbital method for MgO and GaN in the wurtzite and rocksalt structures and for orthorhombic structures along a homogeneous strain transition path linking wurtzite to rocksalt. MgO is found to be unstable in the wurtzite and…
A first-principles-derived approach is used to study structural, piezoelectric and dielectric properties of Pb(Zr_{1-x}Ti_{x})O_{3} (PZT) solid solutions near the morphotropic phase boundary at low temperature. Three ferroelectric phases are found to exist: a tetragonal phase for larger x compositions, a rhombohedral…
The melt-state linear and nonlinear shear rheological properties of hybrid materials of polypropylene and amine-exchanged montmorillonite were studied. The materials were prepared by melt mixing with maleic anhydride functionalized polypropylene as the compatibilizer. The clay interlayer spacing (as determined by wide…
Abstract Production chemicals being discharged into the natural environment are increasingly becoming scrutinized for their impact on the environment. New and existing chemicals for scale and corrosion control are likely to be impacted by the developing legislation and regulatory control. Therefore, there exists an ur…
This is the first report on the oxidative polymerization of indene using cobalt(II) tetraphenyl porphyrin pyridine [Co(II)TPP(Py)] complex, which led to the formation of poly(indene peroxide), PINDP, having narrow polydispersity. The polymerization was carried out at room temperature and low oxygen pressure. The dual…
A unique phase transition between the state of “two macrophase-separated disordered phases” at higher temperatures and that of “a single phase with only a local order” at lower temperatures was observed in a binary mixture of polystyrene (PS)- block -polyisoprene (PI) copolymers by using small-angle X-ray scattering,…
We report the results of the electrical switching and thermal studies performed on the bulk ${\mathrm{Al}}_{20}{\mathrm{Ge}}_{x}{\mathrm{Te}}_{80\ensuremath{-}x}$ chalcogenide glasses which are a sequel to similar experiments on the ${\mathrm{Al}}_{20}{\mathrm{As}}_{x}{\mathrm{Te}}_{80\ensuremath{-}x}$ glasses to asce…
The vapor pressures and vapor molecular weights of the copper and yttrium β-diketonate MOCVD precursors Cu(C 11 H 19 O 2 ) 2 (c) and Y(C 11 H 19 O 2 ) 3 (c) were measured by a torsion-effusion/mass-loss method in the ranges (346 to 375) K and (361 to 387) K, respectively. The molecular weight data indicate that the sa…
A series of linear rod−coil multiblock oligomers of the (rod−coil) n type ( n = 1, 2, 3, 13) consisting of a rigid rod segment made up of three biphenyls connected though methylene ether linkages and a poly(propylene oxide) with degree of polymerization of 13 as a coil segment were prepared, and their thermal behavior…
Nanostructured vanadium-hydrides, ${\ensuremath{\beta}}_{2}\ensuremath{-}{\mathrm{VH}}_{x},$ with typical grain sizes of 80 nm $(x=0.82),$ 30 nm $(x=0.73),$ and 10 nm $(x=0.67)$ were prepared by mechanical milling under hydrogen atmosphere. The final grain size, about 10 nm, does not change any more with increasing mi…
Single-bubble sonoluminescence (SBSL) from noble gases in water is studied theoretically in order to clarify the reason of the distinguished feature that the luminescence is strong for all noble gases, while the other systems of cavitation luminescence are greatly enhanced by the presence of the heavy noble gas(xenon)…
The flagelliform silk protein underlies the unique elastomeric properties displayed by the capture spiral of arachnid webs. To investigate molecular mechanism underlying the elastomeric recovery of the capture spiral, a model polypeptide based upon the elastomeric repeat sequence of Nephila clavipes flagelliform silk…
First-principles total-energy calculations on the tetragonal states of bulk elemental copper have been made with a full-potential electronic structure program with both the local-density approximation (LDA) and the generalized gradient approximation (GGA). The unique path through tetragonal states produced by epitaxia…
[structure: see text]. The epoxidation of (E)-beta-methylstyrene mediated by an oxochromium salen complex yields the epoxide in 92% ee in stoichiometric mode, the highest ee yet reported for a metal-mediated epoxidation of an (E)-alkene. The effect of added donor ligands, previously substantial, has reached a ceiling…
Abstract Scales are minerals that form on a surface due to the saturation of the local environment with an inorganic salt. The major categories of scales are: carbonates (Ca, Mg, Fe(II)), sulfates (Ca, Ba, Sr, Ra), oxides and hydroxides (Fe(II), Fe(III), Mg), sulfides (Fe(II) and Zn) and silicates (Ca, Mg, Al and Na).…