Materials Literature
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Chemical oxidation (silver tosylate, acetone, room temperature) of a non-mesomorphic persubstituted ferrocene derivative leads to the corresponding ferrocenium species which exhibits a smectic A phase (polarized optical microscopy, differential scanning calorimetry, X-ray diffraction).
The phase separation and the coarsening process of polymer mixtures with a thermotropic liquid crystalline polymer (LCP) as one component are investigated. The LCP used is a main-chain type copolyester X-7G, comprised of p -hydroxybenzoic acid (60 mol %) and ethylene terephthalate (40 mol %) units. The isotropic, tran…
Qualitative ab initio theory is used to compare the electronic structures of nickel dithiolate complexes and the monosulfinates arising from O2 oxidations. The results are used to examine the electronic factors involved in the reaction mechanism. The frontier molecular orbitals (FMOs) of the dithiolate complexes are d…
The effect of annealing in UHV on the topographic and electronic structure of the TiO 2 (110) surface was studied by scanning tunneling microscopy and spectroscopy. Different (1× n ) reconstructions with domain sizes of 5−10 nm were clearly identified in the crystallographic orientation [001]. Two other types of recon…
The monoglyme {CH 3 OCH 2 CH 2 OCH 3 } and diglyme {CH 3 O(CH 2 CH 2 O) 2 CH 3 } adducts of the gadolinium trishexafluoroacetylacetonate {Gd(hfa) 3 ·monoglyme ( 1 ) and Gd(hfa) 3 ·diglyme ( 2 )} have been synthesized and characterized by elemental analyses, mass spectrometry, and infrared spectroscopy. Single-crystal…
[Mn13O8(OEt)6(O2CPh)12] was prepared and its X-ray structure has been determined. It is the largest cluster in which there are three oxidation states of a given metal ion in one molecule. The core of the complex is a supercubane [MnIVMnIII6MnII6(μ5-O)6(μ3-O)2(μ3-OEt)6]12+. The magnetochemistry of the compound shows th…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTRigid-Rod Polyesters with Flexible Side Chains. 6. Appearance of Hexagonal Columnar Phase as a Consequence of Microsegregation of Aromatic Main Chains and Aliphatic Side ChainsJunji Watanabe, Nobuhiro Sekine, Tokihiro Nematsu, Masat…
Recent studies have suggested that hydride precipitation at the metal/oxide interface could play a detrimental role on the waterside corrosion rate. Nevertheless, the mechanism of that detrimental role is not completely understood, and two hypotheses were investigated to understand the mechanism that controls the role…
The liquid-crystal templating approach used for the synthesis of M41S mesostructured materials is extended to aluminophosphates; a variety of lamellar AIPO4 phases with d-spacing in the nanometer range are prepared in the presence of long-chain alkyl- or dimethylalkyl-amines.
Electrodeposition of CdSe from nonaqueous solutions is shown to produce epitaxial, 5 nm diameter quantum dots (QDs) on evaporated {111} Au substrate and diffraction-amorphous QDs on evaporated Pd substrate. The QDs were characterized using bright-field and dark-field transmission electron microscopy (TEM), high-resolu…
Electron exchange between ethene molecules is studied using quantum chemical ab initio methods in order to model interchain electron transfer (ET) in polyacetylene. The potential surface for the system is obtained with the distance between the carbon atoms in each molecule as independent variables. The reaction path,…
We report evidence of photoisomerization-induced changes in the optical thickness of molecularly thin (9 Å) photochromic layers which consist of azosilane molecules immobilized on silicon oxide substrates. Further, this light-induced change in the optical thickness of these films can be reversed upon irradiation with…
Photoinduced electron transfer in photosystems consisting of bis(6,6‘-dimethoxy-3,3‘-bipyridazine)(6,6‘-bis[8-((4-methoxyphenyl)oxy)-3,6-dioxaoctyl-1-oxy]-3,3‘-bipyridazine)ruthenium(II) dichloride ( 1 ), tris(6,6‘-bis[8-((4-methoxyphenyl)oxy)-3,6-dioxaoctyl-1-oxy]-3,3‘-bipyridazine)ruthenium(II) dichloride ( 2a ), tr…
The deprotonated form of the water-soluble porphyrin 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetrakis( N -methylpyridinium-4-yl)porphyrin, H 2 OBT(4- N -MePy)P 4+, has a strong affinity for lithium and forms a stable lithium complex in basic aqueous solution. The fully deprotonated form, OBT(4- N -MePy)P 2+, is prese…
The rapid development of catalytic membrane reactors requires materials with a higher permeability and a better mechanical stability than the current thick membranes. Pd-based composite membranes supported on porous stainless steel offer such an alternative. However, commercially available porous stainless steel mater…
The problem of intramolecular hydrogen atom exchange in the OsH 3 (BH 4 )(PR 3 ) 2 system is examined from both theoretical and experimental points of view, through ab initio MO calculations on the OsH 3 (BH 4 )(PH 3 ) 2 system at the MP2, MP4, and CCSD(T) computational levels and variable-temperature 1 H NMR studies…
Monoamine-terminated poly(ethylene oxide), PEO-NH 2 (MW ∼ 5000) has been grafted onto a hydrophobic backbone of polystyrene- alt -maleic anhydride. The backbone has been tagged with a constant fraction of naphthalene and with varying amounts of PEO-NH 2 . Dialysis from dioxane to 100% water produces micelles that have…
Several uncommon features are present in the (μ3-CO3)[Cu3(Medpt)3(ClO4)3](ClO4) complex: quasi-equilateral triangular arrangement of copper atoms; μ3 coordination of the carbonato bridge and ferromagnetic behavior. The title compound shows a gap of 18.9 cm-1 between the S = 3/2 ground state and the two degenerate S =…
Two polytypes of potassium rare-earth-metal hexaselenodiphosphates(IV), K(RE)P(2)Se(6) (RE = Y, La, Ce, Pr, Gd), have been synthesized from the stoichiometric reaction of RE, P, Se, and K(2)Se(4) at 750 degrees C. Both single-crystal and powder X-ray diffraction analyses showed that the structures of these polytypes v…
The reaction of trithiocyanuric acid (H3L) with CuCl(PPh3)3 gives [(CuPPh3)6L2], the structure of which shows two parallel triazine rings held in a close proximity of 3.07 Å by six Cu–S bridges; the complex [(CuPPh3)6L2] shows visible emission in the solid state and in fluid solution at room temperature.