Biomineralization: the form(id)able part of bioinorganic chemistry! *
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Synthesis of carbon nitride films at low temperatures
Carbon nitride films (CNx) have been deposited by sputtering a graphite target with nitrogen ions. Films were grown both with and without the presence of an assisting focused N2 ion beam. The sputter beam voltage was varied between 150 and 1500 V and the applied assisting beam voltage from 80 to 500 V. The substrate w…
Surface characterisation of zirconium-doped mesoporous silica
Zirconium-doped mesoporous silicas of mole ratio Si/Zr from 50 to 5 are Lewis-acid catalysts, with a linear correlation between the zirconium content and total acidity.
A molecular model to evaluate the impact of aging on space charges in polymer dielectrics
The understanding of space charge effects depends largely on how concurrent phenomena, such as thermal and electrical aging are understood. A model describing thermal and environmental aging of dielectric polymers is discussed. The model essentially is based on the rate theory associated with the name of Eyring. One b…
Polynuclear metal complexes of nanometre size. A versatile synthetic strategy leading to luminescent and redox-active dendrimers made of an osmium(II)-based core and ruthenium(II)-based units in the branches
A docosanuclear metal complex of nanometric size and dendritic shape made of an osmium(ii)-based core and containing 21 ruthenium(ii)-based units in the branches has been prepared. The key building blocks are the [Os(2,3-dpp) 3 ] 2+ ‘complex ligand’, and the [Ru(2,3-Medpp) 2 Cl 2 ] 2+ and [{Ru(bpy) 2 (µ-2,3-dpp)} 2 Ru…
Cross-metathesis of alkenes with vinyl-substituted silsesquioxanes and spherosilicates: a new method for synthesizing highly-functionalized Si/O frameworks
Highly functionalized silsesquioxanes and spherosilicates of the formulae [(RCHCH) 8 Si 8 O 12 ] and [(RCHCHSiMe 2 -O) 8 Si 8 O 12 ] can be prepared by cross-metathesisreactions of alkenes with readily available vinyl-substituted silsesquioxane and spherosilicate frameworks, [(vinyl) 8 Si 8 O 12 ] 1 and [(vinylSiMe 2…
[{MoVI8VIV4O 36(VVO4)(VIVO)2 }n]7n−: capped α-Keggin fragments linked to a chain
The synthesis and single-crystal X-ray structure analysis of the unusual Mo/V polyoxometalate compound Na 0.5 K 6.5 [Mo VI 8 V IV 4 O 36 (V V O 4 )(V IV O) 2 ]·12.5H 2 O which contains capped α-Keggin fragments linked to a chain is reported; this chain is an interesting object for magnetochemists and can be considered…
Diffuse wall structure and narrow mesopores in highly crystalline MCM-41 materials studied by X-ray diffraction
Synchrotron X-ray diffraction patterns for highly crystalline MCM-41 a mesoporous silicate molecular sieve are presented. The form factor observed in seven orders of diffraction is used to show the existence of a two-layer wall structure, with a narrower mesopore than previously assumed, and much void space in the wal…
Molecular architecture via coordination: self-assembly of cyclic cationic porphyrin aggregates via transition-metal bisphosphane auxiliaries
Self-assembly and non-covalent interactions are employed for the preparation of a new family of cationic artificial supramolecular multiporphyrin aggregates incorporating Pd II and Pt II bisphosphane complexes as auxiliaries.
Registered growth of mesoporous silica films on graphite
It has recently been demonstrated that hexagonal mesoporous silica films can be grown at mica/water interfaces. In this report it is established that the films can also be synthesized on cleaved pyrolytic graphite. Diffraction and microscopy studies of the growth, structure and form of the films indicate that the chan…
Solution‐phase synthesis of luminescent materials libraries
The application of combinatorial methods to the synthesis and characterization of novel materials is described for the case of solution‐phase synthesis of phosphors based on rare‐earth‐activated refractory metal oxides. A scanning multiinkjet system is shown to be suitable for the fabrication of a liberry such as (La…
n‐Type Conductivity in Gadolinia‐Doped Ceria
The ionic and n‐type conductivities of ceria‐based electrolytes doped with gadolinium (10 and 20 cation %) or gadolinium and praseodymium (2% Pr and 18% Gd) were studied by impedance spectroscopy in air, between 573 and 1273 K, and by constant frequency (10 kHz) conductivity measurements as a function of the oxygen pa…
Modelling the active sites of heterogeneous titanium epoxidation catalysts using titanium silasequioxanes: insight into specific factors that determine leaching in liquid-phase processes
Active catalysts for the epoxidation of alkenes by tert-butyl hydroperoxide are provided by silasesquioxane titanium(IV) derivatives; a non-leaching catalyst, not prone to irreversible protic cleavage of its siloxy functions by the oxidizing agent, contains a terdentate silasesquioxane ligand.
Modelling the active sites of heterogeneous titanium-centred epoxidation catalysts with soluble silsesquioxane analogues
By synthesising and structurally characterising new soluble titanosilsesquioxanes, and by following the dynamics of epoxidation of cyclohexene in their presence, the tripodally anchored TiIV active sites in Ti–SiO2 heterogeneous catalysts are modelled structurally and catalytically.
Formation of monodispersed ultrafine platinum particles and their electrophoretic deposition on electrodes
Ordered ultrafine platinum particles are expected to have properties differing from those of isolated particles, however, few measurements have been made because of the difficulty of producing monodispersed Pt particles. A method is reported for controlling the size and size distribution of polymer‐protected ultrafine…
Rare-earth organic complexes for amplification in polymer optical fibers and waveguides
The optical properties of rare-earth organic complexes have been studied because of their possible application to polymer optical fibers and waveguides. Er3+, Nd3+, and Sm3+ ions are encapsulated in tetrakis(benzoyltrifluoroacetonate) and tetrakis(dibenzoylmethide) chelates, and their radiative properties are evaluate…
Shapes of Dendrimers from Rotational-Echo Double-Resonance NMR
The solid-state shape, size, and intermolecular packing of a fifth-generation dendritic macromolecule were determined by a combination of site-specific stable-isotope-labeling, rotational-echo double-resonance (REDOR) NMR and distance-constrained molecular dynamics simulations. REDOR experiments measured dipolar coupl…
Optimal parameters for the synthesis of the mesoporous molecular sieve [Si]-MCM-41
Highly crystalline MCM-41 with a very narrow pore-size distribution (FWHM=1.5 Å), high surface area (1185 m2 g -1 ), large grain size and thick channel walls (ca. 17 Å) was prepared in alkali-free media. The properties of the product depend on the source and concentration of the reactants, the gel aging time, the temp…
Linearly extended π-donors: when tetrathiafulvalene meets conjugated oligomers and polymers
Molecular or polymeric π-electron donors based on the association of tetrathiafulvalene (TTF) with linear π-conjugated systems are reviewed. Two main classes of materials are considered, namely electrogenerated polymers, either conjugated or not, and linearly extended TTF analogues built by insertion of different π-co…
Synthesis and Characterization of Cobalt−Complex Functionalized MCM-41
Silanation of the internal pore surface of the mesoporous molecular sieve MCM-41 (40 Å) has yielded ethylenediamine (ED), diethylenetriamine (DET), and ethylenediaminetriacetic acid salt (EDT) functionalized sites. These grafted ligands were used for the preparation of cobalt(II) complexes covalently bound to the MCM-…