Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTInfrared Band Broadening and Interactions in Polar SystemsPaul C. Painter, George J. Pehlert, Yuhong Hu, and Michael M. ColemanView Author Information Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 19802 Cite th…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTCharge Fluctuation in MMX Chain Compounds, A4[Pt2(pop)4I]·nH2OM. Yamashita, S. Miya, T. Kawashima, T. Manabe, T. Sonoyama, H. Kitagawa, T. Mitani, H. Okamoto, and R. IkedaView Author Information Graduate School of Human Informatics and PRESTO(JST) Nagoya University Chi…
The reaction of mononuclear [LFe III ] where L represents the trianionic ligand 1,4,7-tris(4- tert -butyl-2-mercaptobenzyl)-1,4,7-triazacyclononane with CrSO 4 ·5H 2 O, CoCl 2 ·6H 2 O, or Fe(BF 4 ) 2 ·6H 2 O and subsequent oxidation with ferrocenium hexafluorophosphate or NO(BF 4 ) or reduction with [(tmcn)Mo(CO) 3 ]…
In the title compound extended sheets of cobalt(II) ions, linked in a square array by bridging formates, couple antiferromagnetically. Spin canting generates residual spin on the sheets, and interaction between the sheets leads to long-range ferromagnetic ordering and spontaneous magnetization below 9 K.
A functionalized, highly ordered mesoporous hybrid material based on the MCM-41 structure is synthesized through room temperature cocondensation of 3-(trimethoxysilyl)propyl methacrylate (TMSiPMA) and tetramethyl orthosilicate (TMOS) in molar ratios of up to 1:3 in the presence of cetyltrimethylammonium chloride. Succ…
Organic−inorganic hybrids prepared by the sol−gel process are investigated by infrared spectroscopy at room temperature. The matrix of the so-called ureasils is a silica network to which oligopolyoxyethylene chains are grafted by means of urea cross-links. The ureasils prepared U(2000), U(900), and U(600) are obtained…
We study the effective interaction between a planar array of uniformly negatively charged, stiff rods parallel to a negatively charged planar substrate in the absence of salt in a continuous, isotropic dielectric medium. Using Brownian dynamics simulations, we examine the general effects of counterion valence, rod spa…
Using self-assembly techniques, x-ray reflectivity measurements, and computer simulations, we study the effective interaction between charged polymer rods and surfaces. Long-time Brownian dynamics simulations are used to measure the effective adhesion force acting on the rods in a model consisting of a planar array of…
Sodium borohydride reduction of silver ions in aqueous dispersions of exfoliated graphite oxide (GO) resulted in the formation of remarkably monodisperse 100 Å diameter oblate Ag particles that are effectively protected by 5 Å thick GO sheets, Ag−GO. Ag−GO could be self-assembled onto poly(diallyldimethylammonium) chl…
The photoluminescence and the local structure of sol−gel derived organic−inorganic hybrids, so-called ureasils, are discussed. Their host matrix is a silica-based network to which different numbers of oxyethylene repeat units 8.5, 15.5, and 40.5 for U(600), U(900), and U(2000), respectively are covalently grafted by m…
Ultrasonic irradiation of a slurry of amorphous silica microspheres, zinc acetate, and thioacetamide in an aqueous medium for 3 h under ambient air yields zinc sulfide coated on silica. The powder X-ray diffraction of the initial zinc sulfide−silica (ZSS) powder yields diffraction peaks corresponding to the ZnS phase.…
The adsorption of CO 2 on NiO(111)/Ni(111) and OD/NiO(111)/Ni(111) was studied by infrared reflection absorption spectroscopy (IRAS). When the surfaces were exposed to CO 2 at 123 K, peaks of adsorbates appeared at 1263 and 910 cm - 1 on NiO(111), while a peak appeared at 1267 cm - 1 on OD/NiO(111). The peaks at 1263…
The orthorhombic modification of CaPbO 3 was synthesized from a mixture of Ca 2 PbO 4 and PbO 2 at high temperature and high pressure. Its structure was analyzed by Rietveld analysis of neutron diffraction data on the basis of space group Pbnm. It has a distorted perovskite structure of the GdFeO 3 type and a unit cel…
The long-time self-diffusion of fluorescent molecular and colloidal tracers in a dense random packing of large (nondiffusing) spheres has been studied for the first time in situ, using fluorescense recovery after photobleaching. The long-time tracer diffusion coefficient depends uniquely on the ratio β of the tracer s…
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…