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Vol. 79, No. 12 (December, 2006)
[PDF version]
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Web Release Date:
December 13, 2006
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1799-1819
Universality and Specificity of Polymer Gels Viewed by Scattering Methods
M. Shibayama
[Full Text PDF(J-STAGE)] Free Access Article
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Light scattering from polymer gels consists of homodyne and heterodyne components due to mobile chains and immobile cross-links. As a result, a speckle pattern appears at the sol–gel transition. This can be used for detection of gelation threshold.
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| Web Release Date:
December 13, 2006
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1820-1833
Tuning of Electronic Structures of Quasi-One-Dimensional Halogen-Bridged Ni–Pd Mixed-Metal Complexes, [Ni1−xPdx(chxn)2X]X2 (X = Cl, Br) with Strong Electron Correlation
M. Yamashita* and S. Takaishi
[Full Text PDF(J-STAGE)] Free Access Article
The tuning of electronic structures has been accomplished in a series of Ni–Pd mixed metal halogen-bridged complexes [Ni1−xPdx(chxn)2X]X2 (X = Cl, Br). The physical properties of these complexes have been measured by means of various techniques, such as optical reflectively, IR and ESR spectra, electrical conductivity as well as STM. Competition between NiIII–NiIII Mott–Hubbard and PdII–PdIV charge-density-wave states was observed. This can be clearly explained by the competition of electron-correlation (U) and electron–phonon interaction (S).
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| Web Release Date:
December 13, 2006
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1834-1851
A Biomimetic Approach for Hierarchically Structured Inorganic Crystals through Self-Organization
H. Imai,* Y. Oaki, and A. Kotachi
[Full Text PDF(J-STAGE)] Free Access Article
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Hierarchical architectures composed of bridged nanocrystals were observed in various biominerals and inorganic crystals produced through a biomimetic pathway. Versatile morphogenesis was achieved with the construction of bridged nanocrystals through self-organization by controlling growth with polymeric molecules.
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| Web Release Date:
December 13, 2006
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1852-1859
Experimental and Computational Study on the Thermochemistry of Bromoanilines
M. A. V. Ribeiro da Silva,* A. I. M. C. L. Ferreira, and J. R. B. Gomes
[Full Text PDF(J-STAGE)] [Supporting Information] Free Access Article
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A combined experimental and computational study on the gas-phase thermochemistry of a few bromoanilines is presented. Thermodynamic data is consistent with intramolecular N–H···Br hydrogen bonding.
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| Web Release Date:
December 13, 2006
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1860-1868
Photoinduced Charge-Separation and Charge-Recombination Processes of Oligo(thienyleneethynyl)–Fullerene Dyad Molecules
M. Fujitsuka, T. Makinoshima, A. Takamizawa, Y. Araki, O. Ito,* Y. Obara, Y. Aso, and T. Otsubo*
[Full Text PDF(J-STAGE)]
Photoinduced charge-separation and -recombination processes in two series of oligo(thienyleneethynyl) (nTE)–C60 dyads, in which nTE-moiety has a linear or zigzag structure, were investigated. It was revealed that the charge-separation rate is limited by solvent motion and recombination rates of the linear dyads are faster that of the zigzag dyad.
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| Web Release Date:
December 13, 2006
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| 1869-1875
Geometrical Isomerism and Stability of Mono- and Dichalcogenide Analogs of Carbamic Acid H2NC(=X)YH (X, Y = O, S, Se)
D. Kaur,* R. P. Kaur, and P. Kaur
[Full Text PDF(J-STAGE)] [Supporting Information]
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Geometrical isomerism of mono- and dichalcogenide analogs of carbamic acid NH2C(=X)YH (X, Y = O, S, Se) have been analyzed. Three decomposition pathways, unimolecular, bimolecular, and two-step proton-catalyzed pathways have been studied.
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| Web Release Date:
December 13, 2006
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| 1876-1880
Millimeter-Wave Rotational Spectrum of CF3CCD in the Ground and Excited Vibrational States v10 = 1
M. Motamedi* and A. Haseli
[Full Text PDF(J-STAGE)]
Millimeter-wave rotational spectra of the symmetric top molecule CF3CCD have been measured in its ground and excited vibrational states, v10 = 1. The analysis of spectra in ground and v10 = 1 states gives rotational parameters. In v10 = 1 state the, ℓ = +1, −1 series have been assigned.
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| Web Release Date:
December 13, 2006
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| 1881-1888
Preparations, Structures, and Properties of Sulfato-Bridged Dinuclear and Tetranuclear Vanadium(III) Complexes with a Dinucleating Ligand, 2-Oxo-N,N ′-bis(2-pyridylmethyl)-1,3-propanediamine-N,N ′-diacetate
K. Kanamori,* N. Matsui, K. Takagi, Y. Miyashita, and K. Okamoto
[Full Text PDF(J-STAGE)] Open Access Article
We synthesized dinuclear and tetranuclear vanadium(III) complexes containing an alkoxo-bridging dinucleating ligand, 2-oxo-N,N ′-bis(2-pyridylmethyl)-1,3-propanediamine-N,N ′-diacetate (hpnbpda), and a sulfato group, and determined their structures by X-ray crystallography.
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| Web Release Date:
December 13, 2006
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| 1889-1893
Effects of Micelles on the Complex Formation of [PtCl(dien)]+ with Biologically Relevant Ligands
T. Soldatović, V. Vasić, and Ž. D. Bugarčić*
[Full Text PDF(J-STAGE)] [Supporting Information]
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Substitution reactions of the [PtCl(dien)]+ complex with L-methionine, glutathione, and guanosine 5′-monophosphate, were studied in aqueous 0.10, 0.05, and 0.01 M NaClO4 solutions at pH 2.5 using UV–vis spectrophotometry. The presence of anionic micelles caused an acceleration in the complex-formation reaction.
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| Web Release Date:
December 13, 2006
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| 1894-1896
Bond Length Contraction in Zinc-Triad Complexes Ligated by Hydrotris(pyrazolyl)borate: [M(Cl){HB(3,5-iPr2pz)3}] (M = ZnII, CdII, and HgII)
K. Fujisawa,* Y. Matsunaga, N. Ibi, N. Amir, Y. Miyashita, and K. Okamoto
[Full Text PDF(J-STAGE)] [Supporting Information]
Bond length contraction in zinc-triad chloro complexes ligated by hydrotris(pyrazolyl)borate was directly observed. The Hg–Cl distance is much shorter than the Cd–Cl one by 0.031(3) Å.
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| Web Release Date:
December 13, 2006
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| 1897-1899
Sulfur-Bonded 2-Methylthiopyridine (2-MeSpy) Complex of Iridium(III). Crystal Structure of [Cp*IrI2(2-MeSpy-κS)] (Cp* = η5-C5Me5)
Y. Sekioka and T. Suzuki*
[Full Text PDF(J-STAGE)] [Supporting Information]
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A reaction of azido(pentamethylcyclopentadienyl)(2-pyridinethiolato)iridium(III), [Cp*Ir(2-Spy)(N3)], with two equivalent amounts of methyl iodide afforded the diiodo(2-methylthiopyridine) complex [Cp*IrI2(2-MeSpy)], in which 2-MeSpy coordinated via the S atom.
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| Web Release Date:
December 13, 2006
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| 1900-1905
Briaexcavatins G and H, Two New Briaranes from the Octocoral Briareum excavatum
Y.-P. Chen, S.-L. Wu, J.-H. Su, M.-R. Lin, W.-P. Hu, T.-L. Hwang, J.-H. Sheu, T.-Y. Fan, L.-S. Fang, and P.-J. Sung*
[Full Text PDF(J-STAGE)]
Two new briarane diterpenoids, briaexcavatins G (1) and H (2), were isolated from the octocoral Briareum excavatum. The structures of these two new metabolites were established by spectroscopy and chemical methods. Briarane 1 showed weak inhibitory effects on human neutrophil elastase release.
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| Web Release Date:
December 13, 2006
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| 1906-1912
syn-Selective Direct Catalytic Asymmetric Mannich-Type Reactions of Aromatic and Heteroaromatic Hydroxy Ketones Promoted by Y[N(SiMe3)2]3/Linked-BINOL Complexes
S. Matsunaga,* M. Sugita, N. Yamagiwa, S. Handa, A. Yamaguchi, and M. Shibasaki*
[Full Text PDF(J-STAGE)] [Supporting Information]
Chiral Y[N(SiMe3)2]3/linked-BINOL catalyst generated Y-enolate in situ from hydroxy ketones (R2 = aryl and heteroaryl). β-Amino-α-hydroxy ketones (R1 = aryl, heteroaryl, and alkenyl) were obtained syn-selectively in high ee and good yield.
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| Web Release Date:
December 13, 2006
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| 1913-1925
Synthesis and Oxidative Ring Contraction of 1,5,3,7-Dichalcogenadiazocanes. Novel Formation of 1,2,4-Diselenazolidines, 1,2,4-Ditellurazolidines, and 1,2,3,4,5,7-Pentathiazocanes
Y. Takikawa, Y. Koyama, T. Yoshida, K. Makino, H. Shibuya, K. Sato, T. Otsuka, Y. Shibata, Y. Onuma, S. Aoyagi, K. Shimada,* and C. Kabuto
[Full Text PDF(J-STAGE)]
Oxidation of 1,5,3,7-dichalcogenadiazocanes A (X = S, Se, and Te) afforded novel cyclic polychalcogenides, 1,2,3,4,5,7-pentathiazocanes C and 1,2,4-dichalcogenazolidines D (X = Se and Te), through a pathway involving in situ generation of bicyclic dichalcogena dications B.
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| Web Release Date:
December 13, 2006
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| 1926-1940
Functionalized Calix[4]resorcinarene Cavitands. Versatile Platforms for the Modular Construction of Extended Molecular Switches
V. A. Azov, A. Schlegel, and F. Diederich*
[Full Text PDF(J-STAGE)]
Dynamic calix[4]resorcinarene-derived cavitands with terminal iodo- or ethynyl residues attached to the cavity walls are versatile platforms for the modular construction of functional architectures which can switch between two highly restricted conformations and can undergo geometrically defined expansions/contractions on the multi-nanometer scale. This is illustrated by the construction of a giant molecular switch in which the distance between donor and acceptor BODIPY dyes can be reversibly changed from ca. 0.8 nm in the contracted vase form to ca. 7 nm in the kite form.
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| Web Release Date:
December 13, 2006
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| 1941-1949
Facile Three-Component Synthesis of Substituted Quinolines Catalyzed by Iridium(III) Complex
T. Nakajima, T. Inada, T. Igarashi, T. Sekioka, and I. Shimizu*
[Full Text PDF(J-STAGE)]
A convenient and efficient synthesis of substituted quinolines via a simple one-pot reaction of an aniline, an aromatic aldehyde, and an aliphatic aldehyde in the presence of the iridium catalyst [IrCl2H(cod)]2 under oxygen, as an oxidant, was developed.
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| Web Release Date:
December 13, 2006
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| 1950-1954
Exciplex Formation of Intermolecularly Hydrogen-Bonded System between Anthracene and N,N-Dimethylaniline Derivatives
I. Ohshiro, M. Ikegami, Y. Nishimura, and T. Arai*
[Full Text PDF(J-STAGE)]
2-Ureido-4(1H)-pyrimidinone (UPy) derivatives bearing anthracene (AN) and N,N-dimethylaniline (DMA) have been synthesized, which can form quadruple hydrogen bonding and exhibit exciplex emission originating from electron-transfer quenching of singlet excited AN by DMA. The results suggest that the DMA locate near a UPy part by a weak interaction.
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| Web Release Date:
December 13, 2006
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| 1955-1962
Preparation of Seven-Membered Carbocycles Using Ring-Closing Metathesis Reaction and Application to Syntheses of Tormesol and Cyathane Skeleton
K. Nakashima, N. Fujisaki, K. Inoue, A. Minami, C. Nagaya, M. Sono, and M. Tori*
[Full Text PDF(J-STAGE)] [Supporting Information]
Various precursors were synthesized and were reacted with the Grubbs reagent as well as the second generation Grubbs reagent to cyclize them into seven-membered carbocycles with di- or tri-substituted double bonds. These reactions were used to synthesize (−)-tormesol, which is an enantiomer of sphenolobane-type diterpene that was isolated from Halimium viscosum, and a basic skeleton of cyathane-type diterpene.
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| Web Release Date:
December 13, 2006
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| 1963-1976
Ruthenium-Catalyzed Addition of Terminal Alkynes to Alkynylstannanes with Migration of the Stannyl Group
E. Shirakawa,* K. Nakayama, R. Morita, T. Tsuchimoto, Y. Kawakami, and T. Matsubara*
[Full Text PDF(J-STAGE)] [Supporting Information]
Alkynes, one of the most common substrates that accept addition of organometallic compounds, cause the stannyl group of alkynylstannanes to migrate from C1 to C2 positions, adding to them with the terminal C–H bond.
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| Web Release Date:
December 13, 2006
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| 1977-1979
Synthesis of 4-Aryl-2-sulfenyl-2H-1-benzothiopyran Derivatives by Cyclization of [2-(1-Aryl-2-methoxyvinyl)phenylthio][methyl(or phenyl)thio]methyllithiums
K. Kobayashi,* M. Horiuchi, K. Miyamoto, O. Morikawa, and H. Konishi
[Full Text PDF(J-STAGE)]
1-(1-Aryl-2-methoxyethenyl)-2-{[methyl(or phenyl)thiomethyl]thio}benzenes were treated with two molar amounts of butyllithium to give 4-aryl-2-methyl(or phenyl)thio-2H-1-benzothiopyrans in fair yields through lithiation of the carbon atom between the two sulfur atoms, followed by intramolecular cyclization with loss of lithium methoxide.
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| Web Release Date:
December 13, 2006
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| 1980-1982
Aromatic C–H Borylation Catalyzed by Hydrotris(pyrazolyl)borate Complexes of Rhodium and Iridium
M. Murata,* H. Odajima, S. Watanabe, and Y. Masuda
[Full Text PDF(J-STAGE)]
Dehydrogenative coupling of pinacolborane with arenes occurred in good yield in the presence of a catalytic amount of [Rh(TpMe2)(cod)], [Ir(Tp)(cod)], and related (pyrazolyl)borate complexes.
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| Web Release Date:
December 13, 2006
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| 1983-1987
Fabrication and Photocatalytic Activity of Fullerodendron/CaCO3 Composites
B. Talukdar, Y. Takaguchi,* Y. Yanagimoto, S. Tsuboi, M. Ichihara, and K. Ohta
[Full Text PDF(J-STAGE)]
Novel composite materials consisting of fullerodendrons and CaCO3 particles were fabricated to have better efficiency as photosensitizers in singlet photooxygenation reactions compared to pristine fullerodendrons. Moreover, fullerodendrons in composites demonstrated the ability to control CaCO3 polymorphism through formation of their thermodynamically least stable form: vaterite.
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| Web Release Date:
December 13, 2006
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| 1988-1990
Controlled Particle Size and Size Distribution of Co–Al Layered Double Hydroxide via the Hydrothermal Urea Method in Aqueous Alcohols
M. Kayano and M. Ogawa*
[Full Text PDF(J-STAGE)]
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Hexagonal platy particles of CoII and AlIII layered double hydroxide with very narrow particle size distribution were obtained from homogeneous water/ethylene glycol or glycerol mixtures via urea hydrolysis under hydrothermal condition.
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