Materials Literature
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Six new diethynylsilane compounds with the general formula Si(C⋮C−R) 2 R‘ 2 (R = p - N- indolylphenyl, R‘ = Me, 1; R‘ = Ph, 2; R = p - N- 7-azaindolylphenyl, R‘ = Me, 3; R‘ = Ph, 4; R = p- 2,2‘-dipyridylaminophenyl, R‘ = Me, 5; R‘ = Ph, 6 ) have been synthesized and fully characterized. Compounds 1, 2, and 4 have been…
GaN-based magnetic semiconductors are expected to exhibit ferromagnetism even at high temperatures. We have studied the magnetic and optical properties of transition-metal- and rare-earth-doped GaN. GaCrN showed ferromagnetic characteristics at 7–400 K. Clear hysteresis and clear saturation were observed in the magnet…
The magneto-optical effect in dilute magnetic semiconductors (DMSs) is directly related to the interaction between the d electrons of the transition metal ions and the s, p electrons of the host semiconductor. We show the advantages of the magneto-optical effect of DMSs as regards fabricating magneto-optical waveguide…
Variable temperature magnetic studies of the Ru(2)(6+) guanidinate compounds Ru(2)(hpp)(4)Cl(2) (1) and Ru(2)(hpp)(4)(CF(3)SO(3))(2) (2) show that they are paramagnetic with two unpaired electrons at room temperature and that they appear essentially diamagnetic at 2 K. In neither compound do the Ru-Ru distances vary b…
The in vivo behavior of copper(II)-cyclen complexes was modified via substitution of the parent ligand with two different substituents, 4-tert-butylbenzyl and acetate. This was achieved by using same synthetic strategy (regioselective protection/first alkylation/deprotection/second alkylation) to give nine cyclen deri…
A polarization beam splitter (PBS) based on a giant-reflection to zero-order (GIRO) grating is presented. The GIRO grating is a simple binary diffraction grating with parameters chosen such that the excited optical modes in the grating interfere constructively and destructively at the respective interfaces. This inter…
The formation of fog on CR39 surfaces has been studied. Water droplets form fog coalesce with time, especially during the first 20 s at the beginning of the formation of fog. Consequently, their mean diameter increases. Formation of fog being related to the wettability of the surfaces, the latter has been increased by…
Reactions of Ru(2)(O(2)CMe)(4)Cl with two formamidines, HDXyl(2,6)F = N,N'-di(2,6-xylyl)formamidine and HDAniF = N,N'-di(p-anisyl)formamidine, have been investigated with the idea of synthesizing compounds with a mixed set of ligands having different labilities to be used as precursors of paramagnetic, higher-order as…
Alignment of energy levels and chemical interaction of the organic pigments ZnPc, substituted F 16 ZnPc, and ZnTPP on H-terminated Si(111) have been deduced from valence band and core level photoelectron spectroscopy with high surface sensitivity for coverage below and in the monolayer region. Hydrogen-terminated Si(1…
Exfoliated polyaniline (PANI)/clay nanocomposites were prepared by in-situ polymerization of aniline onto pre-exfoliated water-soluble poly(styrenesulfonic acid- co -aminostyrene) (P(SSA- co -AMS))/clay nanocomposite or by simple blending of poly(styrenesulfonic acid- g -aniline) (PSSA- g -PANI) with clay. When an aqu…
A universal structural pattern has been presented at density function theory level to incorporate planar tetra-, penta-, hexa-, hepta-, and octacoordinate silicons in C2v B(n)E2Si series (E = CH, BH, or Si; n = 2-5) and D8h B8Si. The equivalence in valence electron counts and one-to-one correspondence of the delocaliz…
The electronic and structural properties of a single-walled carbon nanotube (SWNT) under mechanical deformation are studied using first-principles calculations based on the density functional theory. A force is applied over one particular C-atom with enough strength to break the chemical bonds between the atom and its…
Structural properties of GaN and ZnO layers doped with magnetic impurities were investigated by Raman scattering. Long-range lattice ordering and local atomic arrangement around magnetic impurities were analysed, and their solubility limit was considered. For this study, GaN layers doped with Mn and Cr, and ZnO layers…
Abstract CdTe nanocrystals as fluorescent sensors for Hg2+ ions were synthesized. These nanocrystals were highly sensitive for Hg2+ ions and the selectivity was found to be Hg2+ > Cu2+ > other representative heavy metal ions. Moreover, they bear the following merits. First, they are easily synthesized; s…
Dehydrogenation of 10-methyl-9,10-dihydroacridine (AcrH(2)) by dioxygen (O(2)) proceeds efficiently, accompanied by the two-electron and four-electron reduction of O(2) to produce H(2)O(2) and H(2)O, which are effectively catalyzed by monomeric cobalt porphyrins and cofacial dicobalt porphyrins in the presence of perc…
On the basis of ab initio calculations for Mn-doped GaN, GaP, GaAs and GaSb, we discuss the origin of ferromagnetism in diluted magnetic semiconductors. The calculations use the Korringa–Kohn–Rostoker method in connection with the coherent potential approximation to describe the substitutional and moment disorder. By…
Resonant x-ray scattering (RXS) experiment has been performed for the (3 0 1.5) superlattice reflection in the antiferroquadrupolar and antiferromagnetic phase of DyB2C2. Azimuthal-angle dependence of the resonance enhanced intensities for both dipolar (E1) and quadrupolar (E2) resonant processes has been measured pre…
Mononuclear complexes [Re(bpym)(CO)(3)Cl] and [Pt(bpym)(CC-C(6)H(4)CF(3))(2)] (bpym = 2,2'-bipyrimidine), in which one of the bipyrimidine sites is vacant, have been used as "complex ligands" to prepare heterodinuclear d-f complexes in which a lanthanide tris(1,3-diketonate) unit is attached to the secondary bipyrimid…
A new result enables direct calculation of thermoelastic damping in vibrating elastic solids. The mechanism for energy loss is thermal diffusion caused by inhomogeneous deformation, flexure in thin plates. The general result is combined with the Kirchhoff assumption to obtain a new equation for the flexural vibration…
We report in this paper the studies on protonation, exfoliation, and self-assembly of birnessite-type manganese oxide single crystals. The protonation was carried out by extracting K + ions from the potassium manganese oxide single crystals in a (NH 4 ) 2 S 2 O 8 aqueous solution heated at 60 °C, exfoliation to nanosh…