Structural elucidation of sumanene and generation of its benzylic anions

The structure of sumanene in a solid state was elucidated. The silyl-substituted sumanene was stereoselectively synthesized through generation of the benzylic anions of sumanene.     

BL43IR at SPring-8 redirected

BL43IR at SPring-8 is overviewed regarding the beamline properties on the flux, the brilliance and the noise in comparison with the conventional thermal radiation (TR). The flux is comparable to the TR, and what makes the most of BL43IR is to utilize the high brilliance. We redirect our strategy to concentrate on the microscopes with highly brilliant infrared radiation from SPring-8 and attract the vast TR spectroscopy community.     

Gravitational waves from sub-lunar-mass primordial black-hole binaries: a new probe of extradimensions

In many brane world models, gravity is largely modified at the electroweak scale approximately 1 TeV. In such models, primordial black holes (PBHs) with a lunar mass M approximately 10(-7)M([circle dot]) might have been produced when the temperature of the Universe was at approximately 1 TeV. If a significant fraction of the dark halo of our galaxy consists of these lunar mass PBHs, a huge number of BH binaries will exist in our neighborhood. Third generation detectors such as EURO can detect gravitational waves from these binaries, and can also determine their chirp mass. With a new detector designed to be sensitive at high frequency bands greater, similar 1 kHz, the existence of extradimensions could be confirmed.     

Confirmation of the structures of kuwanons G and H (albanins F and G) by partial synthesis

Conclusive evidence is presented supporting structures $\text{1}$ and $\text{2}$ for two natural Diels-Alder adducts isolated from mulberry and designated as kuwanon G (albanin F, moracenin B) and Kuwanon H (albanin G, Moracenin A).     

Synthesis of cationic hydride and related complexes of palladium and nickel with tricyclohexylphosphine or triisopropylphosphine

The preparation and characterization of a series of cationic hydride complexes of palladium and nickel of the type [MH(L)(PCy₃)₂]BPh₄ (M = Pd, Ni; L = pyridines, pyrazole, imidazole; Cy = cyclohexyl; Ph = phenyl) from new hydride complexes, trans-MH(NO)₃(PCy₃)₂ are described. Trans-PdH(NO₃)(PCy₃)₂ is prepared conveniently by treatment of Pd(NO₃)₂(PCy₃)₂ (yellow form) with NaBH₄ (yield 93%). The relative stability of the nickel triad hydride complexes is discussed.Preparation of PdHCl(PR₃)₂ (R = Cy or i-Pr = isopropyl) by a new method and their derivatives are also reported.     

Investigation of intermolecular interaction in molecular complex of tryptamine and benzoic acid by solid-state 2D NMR

Solid-state NMR spectra and powder X-ray diffraction of the two-component molecular complex composed of tryptamine and benzoic acid were observed to investigate the intermolecular interaction in the molecular complex. 1D (13)C CP/MAS NMR spectrum and powder X-ray diffraction pattern of the complex was clearly different from the convolution of each spectrum of the single component. 2D (1)H-(13)C heteronuclear-correlation (HETCOR) NMR technique indicated that the intermolecular interaction between the primary amine of tryptamine and the carboxyl group of benzoic acid must be related to the complex formation.     

Intermolecular forces for D2, N2, O2, F2 and CO2

The intermolecular potentials for D₂, N₂, O₂, F₂ and CO₂ are determined on the basis of the second virial coeffincients, the polarizabilities parallel and perpendicular to the molecular axes, and the electric quadrupole moment. The repulsive parts of the potentials are taken from the corresponding Kihara core-potentials. Effects of the octopolar induction are taken into consideration in a unique way. The potential depends on relative orientations of the two molecules as well as the distance r between the molecular centers. This dependence is shown in graphs. A measure of the anisotropy of the potential depth is 0.72 for CO₂ 0.36 for D₂, and smaller than 0.27 for N₂ O₂ and F₂. The remarkable anisotropy for CO₂ and D₂ is due to strong electrostatic quadrupole interactions.     

Enantiomorphism in the super helices of poly-γ-benzyl-glutamate

Summary Aggregates of poly--benzyl-d (orl-glutamate were precipitated by mixing of its solution in dimethylformamide or dioxane with propionic acid. Electron micrographs showed that the aggregates were composed of well-developed helical fibrils. The sence of helix was right-handed for thed-isomer and left-handed for thel-isomer; an enantiomorphic relation was shown for the helical aggregate of optical active macromolecule. Two recent publications have given conflicting results for the helical sense of the aggregate. This seems to be ascribed to carelessness in determining the helical sense from the electron micrographs.

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Zusammenfassung Es wurden Aggregate von Poly--benzyl-d (oderl)-glutamat durch Mischung von deren Lösung in Dimethylformamid oder Dioxan mit Propionsäure ausgefällt. Die elektronenmikroskopischen Bilder zeigen, daß die Aggregate aus gut ausgebildeten Helixfibrillen bestehen. Der Drehsinn der Helix war rechtsläufig für dasd-Isomer und linksläufig für dasl-Isomer. Eine enantiomorphe Beziehung läßt sich für die Helix-Aggregate zu den optisch aktiven Strukturen der Makromoleküle zeigen. Zwei kürzliche Veröffentlichungen ergaben zu dem hier Festgestellten widersprüchliche Ergebnisse über den Schraubensinn der Helices der aggregate. Dies scheint der Sorglosigkeit bei der Bestimmung des Schraubensinns von elektronenmikroskopischen Bildern zuzuschreiben zu sein.

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Thermo-sensitive colloidal crystals of silica spheres in the presence of large spheres with poly (N-isopropyl acrylamide) shells

Thermo-sensitive colloidal crystals are prepared simply by mixing colloidal silica spheres and large thermo-sensitive gel spheres. The thermo-reversible change in the lattice spacing of colloidal crystals of monodisperse silica spheres (CS82, 103 nm in diameter) depends on the size of the admixed temperature-sensitive gel spheres. For spheres with sizes less and greater than that of the silica spheres, the lattice spacing upon temperature increase above the lower critical solution temperature of poly(N-isopropyl acrylamide) decreases (cf. Okubo et al. Langmuir 18:6783, 2002) and increases, respectively. A mechanism, which is able to explain these experimental findings, is proposed. Moreover, crystal growth rates and the rigidities of the thermo-sensitive colloidal crystals are studied.