Materials Literature
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The transfer of CdS nanoparticles of dimensions 60 Å synthesized in an aqueous environment into petroleum ether (pet ether) by coordination of the nanoparticles with octadecanethiol (ODT) molecules present in the organic phase is described. The phase transfer of the CdS nanoparticles into pet ether occurs extremely ra…
Exploratory hydrothermal synthesis in the system Cs 2 O−SiO 2 −TiO 2 has produced a new polymorph of Cs 2 TiSi 6 O 15 (SNL-A), whose structure was determined using a combination of experimental and theoretical techniques ( 29 Si and 133 Cs NMR, X-ray powder diffraction, and density functional theory). SNL-A crystalliz…
The synthesis of the phenyl anchored podand H 4 L 1 fitted with four 3-carboxylate pyrazole arms and programmed for intermolecular interactions is reported, and its protonation constants are determined. Interaction with Ln 3+ ions (Ln = La, Eu, Lu) in dilute aqueous solutions leads to complexes with 1:1 and 1:2 metal−…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTInterpolymer Complexes through Hydrophobic Interactions: C60-End-Capped Poly(ethylene oxide)/Poly(methacrylic acid) ComplexesX. D. Huang and S. H. GohView Author Information Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543 Cite this…
Comb-shaped or hairy rodlike supramolecules can be obtained by hydrogen bonding rigid rod polymers and amphiphilic oligomers. Here we introduce a concept to achieve electrically conducting acid doped PANI to allow cylindrical self-organization. PANI is doped with camphorsulfonic acid (CSA) where 4-hexylresorcinol (Hre…
PVT properties were measured for mixtures of poly(ethylene glycol methyl ether)-350 + anisole and poly(ethylene glycol)-200 + anisole at temperatures from 298 K to 338 K and pressures up to 50 MPa. Excess volumes are positive for these two polymer solution systems. The isothermal compressibilities were calculated with…
The vapor pressures for praseodymium trihalides, PrCl 3, PrBr 3, and PrI 3, were measured above solid and liquid phases by the torsion method. In the covered temperature ranges, their values can be expressed by the following equations: PrCl 3 (s), lg( p /kPa) = 12.45 ± 0.20 − (16540 ± 200) K/ T (from 963 to 1045 K); P…
Amorphous ethylene−styrene interpolymers (ESIs) provide an excellent model system for testing contemporary concepts of molecular dynamics. Moreover, the results can be extrapolated to the chain reptation dynamics of amorphous polyethylene at ambient temperature which cannot be assessed by direct experimental technique…
N-[(2-Benzothiazolyl)thio]- (1), N-[(2-benzoxazolyl)thio]- (2), and N-(2-pyrimidylthio)-2,4,6-trisubstituted-phenylaminyls (3) were generated by oxidation of the corresponding amines. Although 2 and 3 were not sufficiently persistent to be isolated, 1 was very persistent and could be isolated as radical crystals. The…
Lipase catalysis in nonaqueous media is recognized as a powerful tool in organic and more recently polymer synthesis. Even though none of the currently known polyhydroxyalkanoate (PHA) depolymerases have lipase activity, they do have a catalytic center that resembles that of lipases. Motivated by the above, the potent…
When small concentrations of A- b -B diblock copolymer are mixed with selective solvent or A homopolymer, they often form spherical micelles with cores comprised of the B blocks. Mean field theory predicts that the core radii scale primarily with the degree of polymerization of the B block as with α ≃ 2/3 or larger, a…
The production of molecular hydrogen in the radiolysis of isotactic polypropylene (PP), poly(methyl methacrylate) (PMMA), and polystyrene (PS) with protons and carbon ions has been investigated. Previous experimental data on the above polymers with γ-ray and helium ion irradiations have been combined with similar stud…
In this paper the synthesis and characterization of a hyperbranched poly(aryl ether oxazole) with terminal phenolic groups are described. An ABB‘ monomer containing a pair of phenolic groups and an aryl fluoride which is activated toward displacement by the attached oxazole ring was prepared. The nucleophilic substitu…
The tension at the air−water interface is fundamentally due to the excess standard chemical potential of water in the interfacial region. Thus, a reduction in surface tension as a result of adsorption of an amphiphilic molecule, that is, surface pressure, must a priori be viewed as a reduction in the standard chemical…
Porphyrins with fused isoquinoline and quinoline units have been prepared by the "3 + 1" methodology. 5-Nitroisoquinoline and 6-nitroquinoline condensed with ethyl isocyanoacetate in the presence of a phosphazene base to give isoquino- and quinopyrroles, respectively. Ester saponification and decarboxylation with KOH…
Chlorins bearing synthetic handles at specific sites about the perimeter of the macrocycle constitute valuable building blocks. We previously developed methodology for preparing meso-substituted chlorin building blocks and now present methodology for preparing several complementary beta-substituted chlorin building bl…
Novel self-assembled molecular capsules were constructed from two moles of pyridine-containing porphyrin derivatives and four moles of Pd(II) complexes utilizing a pyridine-Pd(II) interaction. The (1)H NMR spectral studies established that these self-assembled molecular capsules 5 and 6 have a highly symmetrical D(4)(…
Holographic surface relief gratings (SRGs) were fabricated on composite films assembled by electrostatic layer-by-layer (ELBL) deposition of a polyelectrolyte, poly(dimethyl diallylammonium chloride) (PDAC), and an azo dye, Congo Red (CR). Surface modulation and first-order diffraction efficiency of the SRG were found…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA New Method to Synthesize Unsymmetrical Dithiolene Metal Complexes of 1,3-Dithiole-2-thione-4,5-dithiolate for Third-Order Nonlinear Optical ApplicationsJie Dai, Guo-Qing Bian, Xin Wang, Qing-Feng Xu, Min-Yan Zhou, Megumu Munakata, Masahiko Maekawa, Ming-Hong Tong, Zh…
The precipitation kinetics of hydroxyapatite from calcium phosphate aggregates was investigated by the continuous-angle laser light- scattering technique in the systems CaCl 2 −H 3 PO 4 −H 2 O and KCl−CaCl 2 −H 3 PO 4 −H 2 O at 25 °C. The apparent molecular weights of aggregates increased with time, and precipitation…