Materials Literature
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The hydrothermal reaction of MoO 3 , Mo metal, NiCl 2 and 4,4′-bipyridine yields a step-layered molybdenum oxide [4,4′-H 2 bpy)][Mo 7 O 22 ]·H 2 O, a material structurally related to layered MoO 3 .
The reaction of ZnEt 2 with HO(O)P(O t Bu) 2 gives the insoluble polymer {Zn[O 2 P(O t Bu) 2 ] 2 } n ( 1 ). In the presence of slight amounts of water, this reaction produces good yields of the oxo-centered tetranuclear cluster Zn 4 (μ 4 -O)[O 2 P(O t Bu) 2 ] 6 ( 2 ), which has been characterized by X-ray crystallogra…
Interest in organic photocells was significantly renewed a few years ago due to discovery of extremely fast photo-induced charge transfer (CT) from conducting polymer (CP) to fullerene C/sub 60/ molecules in CP(C/sub 60/) composites. This allowed creation of interfacial junction photocells with relatively high efficie…
A highly ordered organic inorganic nanocomposite can be synthesized by photopolymerizing an inverse hexagonal lyotropic liquid crystal phase consisting of an amphiphilic monomer and organic crosslinker as the organic matrix and a sol‐gel silica precursor solution as the hydrophilic component (see Figure). In situ sili…
meso-Arylporphyrins participate, as dienophiles, in Diels–Alder reactions with o-benzoquinodimethane to yield novel chlorins, bacteriochlorins and naphtho[2,3-b]porphyrins.
The polyhedral arrangements in xTiO 2 .(1-x)P 2 O 5 (0.55≤x≤0.70) and yTiO 2 .(1-y)Ca(PO 3 ) 2 glasses have been characterised by Raman spectroscopy electron spin resonance (ESR) spectroscopy and solid state 31 P magic angle nuclear magnetic resonance (MAS NMR) spectroscopy In the binary titanophosphate glasses, struc…
Self-assembly of U-shaped 1,3-dialkylbenzimidazolium salts through hydrogen bonds and interdigitation of alkyl chains produces a bilayer structure with lamellar α and β mesophases.
We calculate the scattering spectra of weakly charged, randomly cross-linked polymer gels in poor and in ϑ solvents. For some values of the thermodynamic parameters, the competition between poor solubility, electrostatics, and network elasticity leads to the divergence of the structure factor at a wave vector q *, sig…
Two new series of racemic dimeric liquid crystals containing terminal alkyl chains with methyl branches are presented; in one the dimers are symmetric and in the other they are non-symmetric. Comparisons are made with the structurally isomeric series with no methyl branches in their terminal alkyl chains. The stabilit…
The aerobic epoxidation of alkenes with 2-methylpropanal can be carried out under fluorous biphasic conditions, in the presence of the perfluorocarbon soluble cobalt complex of tetraarylporphyrin 3 as catalyst.
Quenching of the luminescent excited state of Eu 3+ ions by C−H high-vibrational modes was studied by deuteration of the encapsulating ligand and the solvent. Novel polydentate hemispherands providing nine donor atoms, which form overall neutral complexes with rare earth ions, were synthesized in nine steps, allowing…
The thermotropic phase behaviour and self-assembling features of some non-ionic tetraphenylporphyrins and phthalocyanines containing oligo(ethylene oxide) alkoxy or alkyl units have been investigated. From DSC measurements and polarization microscopy it was concluded that none of the tetraphenylporphyrins was mesomorp…
Biodegradable polymers have attracted much attention as implantable drug delivery systems. Uncertainty in extrapolating in vitro results to in vivo systems due to the difficulties of appropriate characterization in vivo, however, is a significant issue in the development of these systems. To circumvent this limitation…
Iron loss measurements of Mn-Zn ferrite cores up to the megahertz range are reported. Taking the dc magnetic hysteresis, the eddy, and displacement currents into account, magnetic and electric field distributions in the cores are computed with the cylindrical coordinates and Bessel functions. The computed iron loss du…
Citrate synthase forms citrate by deprotonation of acetyl-CoA followed by nucleophilic attack of this substrate on oxaloacetate, and subsequent hydrolysis. The rapid reaction rate is puzzling because of the instability of the postulated nucleophilic intermediate, the enolate of acetyl-CoA. As alternatives, the enol of…
Heterogeneous mesoporous stable basic catalysts have been prepared by wet or solid-state impregnation of MCM-41 with caesium acetate and lanthanum nitrate followed by thermal decomposition. 133 Cs MAS NMR data of CsLa/MCM-41 show an increase in the Cs–O bond length in the CsLa mixed oxides compared with that in Cs oxi…
Thermally stable mesoporous hexagonal aluminophosphates (UHM-1) and silicoaluminophosphates (UHM-3) are synthesized based on ion-pair interactions of aluminophosphate species in the presence of tetramethylammonium hydroxide with a cationic surfactant [C 16 H 33 NMe 3 Cl].
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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…
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.