Materials Literature
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Manganese-exchanged Al-MCM-41 modified by the chiral salen ligand [(R,R)-(−)-N,N′-bis(3,5-di-tert-butylsalicylidene)cyclohexane-1,2-diamine] can be used as an enantioselective heterogeneous epoxidation catalyst using iodosyl benzene as oxygen donor. Epoxidation of (Z)- and (E)-stilbene is studied in detail and experim…
This article describes the solution behavior of model amphiphilic linear-dendritic ABA block copolymers that self-assemble in aqueous media and form micelles with highly branched nanoporous cores. The materials investigated are constructed of poly(ethylene glycol), PEG, with molecular weight 5,000 or 11,000 as the wat…
The absorption and CD spectra of a series of Fréchet (compounds 7-10) and backfolding (compounds 11-12) dendrimers derived from enantiopure (S)-2,2′-dihydroxy-1,1′-binaphthalene have been recorded (THF) in the range 200-350 nm. All the compounds examined show a positive couplet between 200 and 240 nm (1B transition of…
The luminescence emission of a new dipyridyl-containing Eu(III) cryptate complex is modulated by pH, due to protonation of the polyamine chain strategically inserted within the ligand backbone.
It is now well known that the addition and trimming of oligosaccharide side chains during post-translational modification play an important role in determining the fate of secretory, membrane, and lysosomal glycoproteins. Recent studies have suggested that trimming of oligosaccharide side chains also plays a role in t…
Overview of IC Interconnects. Behavior of Copper Impurity Atoms. Copper-Related Defects in Silicon. Chemistry and Electrochemistry. Copper in Inorganic Dielectrics. Copper in Organic Dielectrics (Polymers). Diffusion and Compound Formation. Layered Structures Containing Copper. Copper for IC Metallization. Future Dire…
The heptadentate ligand 2POAP combines two bridging alkoxide oxygen donors with diazine and pyridine terminal nitrogen donors in a linear array with the binding sites positioned critically to accommodate three metal centres, but on reaction with Mn(ClO4)2·6H2O a strict self assembly process occurs, producing a unique…
The co-ordination properties toward Na+, Ca2+, Zn2+, Cu2+ and Gd3+ of six ligands containing pendant functionalities attached to the common 1,4,7,10-tetraazacyclododecane macrocyclic ring have been studied by means of potentiometric and microcalorimetric methods. Stability constants for the 1,4,7,10-tetra(methylcarbam…
Dianionic members of the Mn12 family of single-molecule magnets have been prepared by two-electron reduction of the neutral cluster; the [PPh4]2[Mn12O12(O2C CHCl2)16- (H2O)4] representative has been shown to possess an S = 10 ground state and to exhibit out-of-phase ac susceptibility signals diagnostic of single-molec…
A series of titania modified mesoporous silicate MCM-41 (MCM-TiO2) samples with variable Ti/Si ratios have been synthesized from tetrabutyltitanate and calcined MCM-41. The samples were characterized by powder X-ray diffraction (XRD), FTIR spectroscopy, thermal analysis (DTA–TG), nitrogen adsorption–desorption at 77 K…
Radical polymerization of acrylonitrile (AN) with methacrylic acid (MAA) and itaconic acid (IA) was carried out in a mixture of dimethylformamide (DMF) and water at 70°C using α, α′-azobisisobutyronitrile (AIBN) as an initiator. Monomer feed in the polymerization vessel was 98:2 (AN:MAA/IA) in the molar ratio, and the…
The open‐circuit potential deposition of nickel on silicon from fluoride solutions has been studied under potentiostatic control for two extreme values of pH. At pH 1.2, nickel ions are unable to exchange charge with the silicon substrate, and thus deposition is not observed. At pH 8.0, nickel ions in solution can exc…
Improvement of Grain‐Boundary Conductivity of 8 mol % Yttria‐Stabilized Zirconia by Precursor Scavenging of Siliceous Phase, Lee, Jong‐Heun, Mori, Toshiyuki, Li, Ji‐Guang, Ikegami, Takayasu, Komatsu, Manabu, Haneda, Hajime
Two complexes, [{Co(phen)2}2V6O17]n 1 and [{Cu(phen)2}4- V10O29]·6H2O 2, have been hydrothermally synthesized; X-ray crystallography shows that 1 consists of one-dimensional stepped chains built up from covalently linked {V6O17}n4n chains and [Co(phen)2]2+ fragments while 2 is composed of a discrete V10O298 cluster co…
The ‘Marcus-inverted’ region for BET in a π–π stacked fullerene–porphyrin dyad was determined based on (i) the photoactivation of an intramolecular ET in a variety of solvents and (ii) the formation of a highly energetic charge-separated state
The performance of a single‐chamber solid oxide fuel cell (SOFC) was studied between 350 and 900°C in flowing mixtures of methane, ethane, propane, or liquefied petroleum gas and air with a fuel/air volume ratio of one, where their oxidation proceeded safely without explosion. Among all tested electrode materials, cer…
Radiation-induced grafting of styrene onto poly(tetrafluoroethylene) (PTFE) films was studied by a simultaneous irradiation technique. Grafting was carried out using γ-radiation from a 60Co source at dose rates of 1.32–15.0 kGy h−1 at room temperature. The effects of type of diluent, dose rate, irradiation dose, and t…
A procedure for the reconstruction of all-atom protein structures from side-chain center-based low-resolution models is introduced and applied to a set of test proteins with high-resolution X-ray structures. The accuracy of the rebuilt all-atom models is measured by root mean square deviations to the corresponding X-r…
The possibilities offered by hybrid functional materials formed by two molecular networks in the context of crystal engineering are illustrated with two different examples: (i) hybrid magnets constructed from combination of an extended ferromagnetic or ferrimagnetic inorganic network, with a molecular paramagnetic met…
Nanoscale CoPt grains were prepared within protein shells from aqueous reactants. A series of particles with varying Co:Pt ratios was used to explore the transition from superparamagnetic to ferromagnetic behavior at room temperature. TEM and electron diffraction confirmed ordered fct CoPt phases with an average grain…