Materials Literature
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We report here the synthesis of the ligand 1-(( p -nitrophenyl)carboxymethyl)-4,7,10-tris(carboxymethyl)-1,4,7,10-tetraazacyclododecane ( 3 ) and its La(III), Gd(III), Ho(III), and Yb(III) complexes. The introduction of the p -nitrophenyl substituent on the methylenic carbon of one acetate group does not alter the ove…
A series of regioregular head-to-tail poly[3-(alkylthio)thiophenes] have been synthesized. The synthetic approach includes the in-situ preparation of 2-bromo-3-(alkylthio)-5-(bromozincio)thiophenes via regiospecific oxidative addition of Rieke zinc (Zn*) to 2,5-dibromo-3-(alkylthio)thiophenes, and the regiospecific po…
We report the crystal structure at 1 Å resolution of europium bound to diethylenetriaminepentaacetate covalently coupled to an organic chromophore, carbostyril 124 (DTPA-cs124; carbostyril 124 = 7-amino-4-methyl-2(1 H )-quinolinone). The complex is highly luminescent in solution and in the crystal form. The Eu-DTPA-cs…
The performance of a 12.2L batch crystallizer operated under natural cooling mode was remarkably improved with seeding. The product crystal size distribution (CSD) was bi-modal at low seed concentrations, reflecting the contribution of crystals newly generated by a secondary nucleation mechanism. With increasing seed…
Spectral properties and equilibrium constants of multimolecular complexes (triads) formed by 2-fold coordination of dipyridyl-substituted free bases of porphyrin, chlorin, or tetrahydroporphyrin with Zn−porphyrin and Zn−chlorin dimers bridged by either of two different spacers between the monomeric entities have been…
Two kinds of styrene microemulsion systems were polymerized to prepare polystyrene microspheres (micro-PS), one emulsified by sodium dodecyl sulfate (SDS) and coemulsified by 1-pentanol and the other emulsified by octylphenoxypoly(ethoxyethanol) (OP-10). Micro-PS possessed an essentially atactic configuration from 1 H…
New layered perovskite compounds of RbLaTa2O7 and RbCa2Ta3O10, whose Rb+ ions can be ion-exchanged have been synthesized directly by a solid-state reaction. Lithium ion-exchanged compounds, LiLaTa2O7 and LiCa2Ta3O10, have also been synthesized by ion-exchange reactions of the rubidium compounds with LiNO3 molten salt.…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSyntheses of Trisulfonated Phthalocyanines and Their Derivatives Using Boron(III) Subphthalocyanines as IntermediatesSvetlana V. Kudrevich, Sandra Gilbert, and Johan E. van LierView Author Information MRC Group in the Radiation Sciences, Faculty of Medicine, Université…
Conjugates of oligonucleotides with chlorin-type photosensitizers were prepared. Two chlorin moieties, CPP and CHEVP, characterized by a modified pyrrole unit bearing an aldehyde chain, were photochemically prepared from protoporphyrin and heptaethylvinylporphyrin, respectively. These chlorin moieties were coupled thr…
The anionic polymerization of ( R )-β-butyrolactone initiated with either 18-crown-6 complexes of a potassium alkoxide or a simple carboxylate (reference initiator) proceeded with inversion of configuration. As a result ( R )-β-butyrolactone formed an isotactic poly(( S )-β-hydroxybutyrate) with these initiators at ro…
Mesoporous molecular sieves are generated using primary amine surfactants as the template in thte assembly of aluminosilicate inorganic species; aluminium incorporation is accompanied by charge-balancing protonated amine molecules.
We have analyzed a newly available high resolution and precision repeat of the original Martin and Haseltine experiment which includes the influence of DMSO on the results. The new model includes the production and diffusion of radical species and .OH radical attack on DNA as well as the direct hits. Calculations of s…
We describe the deformation behavior of polymer brushes and mushrooms compressed by finite-sized particles for the cases where the chains are fixed or mobile on the grafting surface. When the size of the particle is large compared to the grafting distance of the chains, the force on the particle is the same to lowest…
The interaction of NO with Cu{110} is complex and is strongly dependent on both coverage and temperature. When Cu{110} is exposed to NO in the temperature range 40−85 K, initial adsorption leads to the presence of molecular NO on the surface. With further exposure this is replaced by the dimeric (NO) 2 species and N 2…
A systematic PWM iron loss study has been carried out. All the loss components can be given as functions of the sum of pulses width in half a period. PWM loss surplus when compared with the sinusoidal supply is more pronounced in the laminations with more important part of dynamic loss in the whole loss outcome. Along…
The dielectric behavior of polybutadiene copolymers with different compositions of 1,2 and 1,4 units is analyzed to study the influence of the microstructure on the relaxation spectrum, especially the β relaxation. The experimental data were obtained between 10 -2 and 10 6 Hz and temperatures above and below T g . Abo…
Conditions for preparing copper–cerium mixed oxides by coprecipitation have been examined. X-Ray diffraction (XRD), electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS) were used to characterize the oxides calcined at different temperatures up to 1073 K. In all cases, a solid solution is fo…
The kinetics of spiropyran photochromic systems in solution in a stirred batch reactor continuously irradiated with monochromatic light was studied by UV/visible spectrophotometry. The plots of absorbance vs time were analyzed, and the desired parameters (quantum yields, UV/visible spectrum of the unstable photomerocy…
Rapid water exchange and slow rotation are essential for high relaxivity MRI contrast agents. A variable-temperature and -pressure (17)O NMR study at 14.1, 9.4, and 1.4 T has been performed on the dimeric BO(DO3A)(2), 2,11-dihydroxy-4,9-dioxa-1,12-bis[1,4,7,10-tetraaza-4,7,10-tris(carboxymethyl)cyclododecyl]dodecane,…
The contribution of a redox mechanism involving lattice oxygen in the catalytic combustion of methane over PdO/ZrO 2 catalysts, prepared from amorphous Pd−Zr alloys, has been studied by means of gas pulse methods, including a novel technique “pulse thermal analysis”, and using labeled catalysts containing Pd 18 O. Spe…