Materials Literature
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Transition-metal complexes with prototypical ligands were studied using the PM3(tm) semiempirical method. The calculated complexes in this paper include 35 halides, 7 aqua complexes, 7 tris(ethylenediamine) complexes, 27 multiply bonded complexes, and 19 organometallics. PM3(tm)-predicted geometries were compared with…
The tris(2,2‘-bipyridine)ruthenium(II) complex (Ru(bpy) 3 2+ ) derivative monomer was copolymerized with N - tert -pentylacrylamide and N -dodecylacrylamide. These copolymers, p( t PA-Ru) and p(DDA-Ru), formed stable condensed monolayers at the air/water interface. The monolayers could be successively transferred onto…
Submonolayers of octadecylsiloxane (ODS) were prepared by adsorption from dilute solutions of octadecyltrichlorosilane (OTS) onto a series of different substrates: mica, native silicon (Si/SiO 2 ), and mica coated with a defined number n SiO of SiO 2 monolayers ( n SiO = 1, 2, 4, 6). Atomic force microscopy (AFM) was…
The alpha-1 and alpha-2 [P(2)W(17)O(61)](10)(-) isomers, derivatives of the Wells-Dawson molecule, [alpha-P(2)W(18)O(62)](6)(-), may be useful ligands for stabilizing high-valent metal ions and lanthanides and actinides. However, the potential utility of the [alpha1-P(2)W(17)O(61)](10)(-) ligand has not been realized.…
Transparent Si/SiOx nanocomposite films, spontaneously adsorbed on glass or quartz substrates from their colloidal suspensions via a sonication-assisted oxidation process, are presently reported. Individual nanosilicon particles (ca. 20 nm) appear to cover a significant part of the substrate along with agglomerates on…
The complexation of Cd(II) by the tripodal ligand tris[(2-pyridyl)methyl]amine and dipodal ligand bis[(2-pyridyl)methyl]amine was investigated by solution-state NMR and X-ray crystallography. Cadmium coordination compounds exhibiting rarely observed solution-state NMR (1)H-(111/113)Cd satellites were characterized. Th…
The size distribution of metastable oil droplets in water was investigated by the dynamic light-scattering method for tetralin (1,2,3,4-tetrahydronaphthalene), benzene, n -hexadecane, and their mixtures under surfactant-free conditions. For pure tetralin, droplets appeared with multiple peak distributions, first at si…
Tetraethoxysilane (TEOS) and octyltriethoxysilane (C 8 -TEOS) were used in the synthesis of an organic−inorganic hybrid glass composite by the sol−gel process. This composite was used as the stationary phase for chromatographic and electrophoretic separations when cast onto the inner walls of capillary columns. To inv…
This report describes a computer-aided CW- and pulsed-electron paramagnetic resonance (EPR) investigation on the structural modification of dimyristoylphosphatidylcoline (DMPC) vesicles, which occur upon interaction with starburst dendrimers (SBDs). Probes used for this study included doxyl-functionalized stearic acid…
The domain morphology of a polystyrene/poly(methyl methacrylate)/poly(2-vinylpyridine) (PS/PMMA/PVP) polymer blend was studied after spin-coating a film from a common solvent. The strongly incompatible polymer mixture phase-separates during spin-coating. Atomic force microscopy, combined with selective dissolution of…
So far, it is known that various poly(3-hydroxybutanoate), PHB, depolymerases are able to degrade all -( R ) chains, cyclic ( R ) oligomers, oligolides, and polymers composed of rac -hydroxybutanoate, HB, but not all -( S ) or syndiotactic ( R, S ) chains. We have now studied the ability for configurational recognitio…
We have measured the shear modulus and viscosity of two supercooled liquids: tricresyl phosphate and squalane. In both cases we find that the width of the peak in the imaginary part of the shear modulus narrows as the temperature is lowered toward the glass transition temperature. For tricresyl phosphate, we find no e…
The macrocyclic [LnNiL]Cl3 complexes (Ln = LaIII, CeIII, PrIII, NdIII, SmIII, EuIII) contain both lanthanide and transition metal ions. The crystal structure of [LaNiL]Cl3 reveals a square planar environment of Ni(II) ion and an 8-coordinate, irregular coordination sphere of La(III) ion. The 1H and 13C NMR spectra of…
Determination of the surface pK(a) of self-assembled monolayers (SAMs) at aqueous buffer/gold interfaces using surface-enhanced Raman scattering (SERS) measurements, namely, SERS titration, is reported for the first time. From the analysis of pH-dependent SERS spectra of 4-mercaptopyridine monolayers on gold, the pK(1…
Multiple sialic acid (SA) residues conjugated to a linear polyacrylamide backbone are more effective than monomeric SA at inhibiting influenza-induced agglutination of red blood cells. However, "polymeric inhibitors" based on polyacrylamide backbones are cytotoxic. Dendritic polymers offer a nontoxic alternative to po…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of Hyperbranched Aromatic Polyamide from Aromatic Diamines and Trimesic AcidMitsutoshi Jikei, Sung-Hyun Chon, Masa-aki Kakimoto, Susumu Kawauchi, Tatsuya Imase, and Junji WatanebeView Author Information Department of Organ…
Polypyrrole (PPy) with four different counterions was electrochemically synthesized in homemade polycarbonate particle track-etched membranes with different pore sizes. A dependence of the PPy growing rate on the pore size and on the electrolyte nature and concentration has been observed. The morphology of the differe…
Colloidal assemblies are used to synthesize FCC cobalt nanoparticles. The particles are coated, extracted from micelles, and characterized by transmission electron microscopy, small angle X-ray scattering, and electron and X-ray diffraction spectroscopy. These cobalt metal particles are stable in air, have a narrow si…
The aging of unstabilized low density polyethylene (LDPE) films and those stabilized with hindered amine light stabilizers (HALS) was studied as a function of the exposure time to thermo-oxidation at 90°C and to natural weathering. The HALS tested was Tinuvin 783 from Ciba-Geigy and added to the polymer in the concent…
The nucleation of small Cu clusters at the surface of SiO 2 has been investigated by means of ab initio quantum chemical calculations using cluster models. The interaction of Cu n clusters ( n =1−5) with a nonbridging oxygen, NBO, a paramagnetic point defect of silica, has been studied by means of DFT calculations usi…