Strength Function in Continuum with a Square Integrable Basis

We present a new approach to describe the three-body continuum with a square integrable basis and show some examples to assess its efficiency. The formulation is done elegantly in the hyperspherical formalism and the tail behavior is appropriately corrected with use of the Green??s function. The efficiency of this approach is shown in a simple solvable problem by calculating the electric dipole strength function of a three-body system and comparing it to that obtained with the complex scaling method, which is widely used for calculating the strength function.     

Interaction between Dyes and Polyelectrolytes. XV. Effect of Mixed Dimer Formation on the Excitation Energy Transfer between Bound Dyes

The effect of polyanions on the formation of mixed dimers of methylene blue (MB) and trypaflavine (TF), MB and phenosafranine (PhS), and MB and pyronine G (PG) was investigated spectrophotometrically. The following polyanions were used: potassium poly(vinyl sulfate) (PVSK), potassium poly(styrenesulfonate) (PSSK), sodium poly(methacrylate) (PMANa), and sodium poly-(acrylate) (PAANa). The formation of mixed dimers was dependent on the kind of polyanion and polyanion-dye ratio. MB-photo-sensitized isomerization of cis-p-(phenylazo)-phenyltrimethyl-ammonium iodide (cis-PTA) to the trans-isomer was used advantageously to investigate the triplet excitation energy transfer between cationic dyes bound to polyanions. Although the efficiency of the excitation energy transfer between MB and cis-PTA was enhanced by the addition of polyanions, the formation of mixed dimer of MB with TF, PhS, or PG reduced the efficiency of the excitation energy transfer. Correlation with the formation of mixed dimer of MB with TF, PhS, or PG and the efficiency of the excitation energy transfer from MB to cis-PTA is discussed.     

Controlled Polymerization of Protic Ionic Liquid Monomer by ARGET‐ATRP and TERP

The direct synthesis of structurally well‐defined protic polymeric ionic liquid (PIL) with controlled molecular weight and molecular weight distribution is examined using N,N‐diethyl‐N‐(2‐methacryloylethyl) ammonium bis(tri‐fluoromethylsulfonyl)imide (DEMH‐TFSI) as a monomer. Three polymerization methods, namely, atom transfer radical polymerization (ATRP), activators regenerated by electron transfer (ARGET)‐ATRP, and organotellurium‐mediated living radical polymerization (TERP) are employed in this study. While the polymerization by ATRP is slow and does not reach high monomer conversion that under ARGET‐ATRP and TERP proceeds smoothly and affords structurally well‐defined poly(DEMH‐TFSI)s. TERP is especially efficient for the control and poly(DEMH‐TFSI)s with low to high molecular weights ( = 49 100–392 500) and narrow molecular weight distributions (/ = 1.17–1.46) are obtained. These results represent the first example of synthesis of a structurally well‐defined protic, ammonium PIL by direct polymerization of the protic ionic liquid monomer. The polymerization of N,N‐diethyl‐N‐(2‐methacryloylethyl)‐N‐methylammonium bis(trifluoromethylsulfonyl)imide (DEMM‐TFSI), which possesses a quaternary ammonium salt, also proceeds in a highly controlled manner under TERP conditions. A diblock copolymer, polystyrene‐block‐poly(DEMH‐TFSI), is also successfully synthesized by TERP.

     

Synthesis and Physicochemical Properties of Novel Liquid Crystal Compounds with Negative Dielectric Anisotropy with a Tetrahydropyran Ring: Part 2

With the aim of improving the properties of liquid crystal (LC) mixtures for VA-LCD and PSA-LCD, JNC has newly synthesized 2-(4’-ethoxy-2’,3’-difluorobiphenyl-4-yl)-5-alkenyltetrahydro-2H-pyran derivatives with alkenyl substituents as side chains, and then measured various physicochemical properties to compare their properties to LC compounds with alkyl substituents as side chains. We have shown that several LC compounds with side-chain alkenyl substituents lead to the development of a larger negative dielectric anisotropy (Δ?) than for side-chain alkyl substituents. We considered the reason for this using a quantum chemical calculation. As a result, it was found that, compared to alkylated compounds, there exist several LC compounds with side-chain alkenyl substituents, which have a higher existence probability of conformers with a β angle, making expression of a larger |Δ?| possible in an effective manner. It was understood from this study that the physicochemical properties of LC mixtures for VA-LCD and PSA-LCD, which consist of LC compounds as a structural component, newly developed by JNC, show useful properties.     

Electron and positron induced processes. POSMOL 2013

POSMOL 2013, the international meeting on electron and positron induced processes comprising the XVII International Workshop on Low-Energy Positron and Positronium Physics and the XVIII International Symposium on Electron-Molecule Collisions and Swarms, was held at Kanazawa Bunka Hall, Kanazawa, Ishikawa, Japan, from 19–21 July 2013. The XVII Workshop encompassed all aspects of positron, positronium and antiproton interactions with electrons, atoms, molecules and solid surfaces, and topics related to these, whereas the XVIII Symposium encompassed all aspects of electron interactions with molecules in both gaseous and condensed phases. Particular topics include studies of electron interactions with biomolecules, electron induced surface chemistry and the study of plasma processes. Recent research on the study of electron swarms was also highlighted.     

Recent Advances in the Chemistry and Synthetic Uses of Amino‐1,3,4‐thiadiazoles

Amino‐1,3,4‐thiadiazoles, although scarce in nature, constitute a group of nitrogen and sulfur heterocyclic compounds that have shown significant biological activities. Their transformations into other biologically active compounds have been exploited. This review describes the work on the synthesis and reactions of amino‐1,3,4‐thiadiazoles as well as their biological evaluation.     

Highly sensitive measurements of perturbations in stiffness of a resonator by virtual coupling with a virtual resonator

Nonlinear Dynamics - We propose a highly sensitive method to measure perturbations in stiffness of a resonator such as a cantilever, which is implemented in, for example, an AFM or stiffness meter....     

Construction of highly oriented crystalline surface coordination polymers composed of copper dithiooxamide complexes

Layer-by-layer bottom-up crystal engineering of metal-organic crystals at the surface of sapphire or glass from organic (rubeanic acid and derivatives) and inorganic (Cu(2+)) components which when mixed in solution form instantly an amorphous solid with high proton conduction.