-
Takashi Kato, Gohta Kondo, Kenji Hanabusa
1998 Volume 27 Issue 3 Pages
193-194
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A novel class of anisotropic gels has been obtained by the formation of a self-associated molecular network in a liquid crystal. The gels exhibit thermoreversible two gel states derived from liquid-crystalline and isotropic states of the mesogenic molecule.
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Yasuyuki Ura, Ryuichiro Hara, Tamotsu Takahashi
1998 Volume 27 Issue 3 Pages
195-196
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A zirconocene-ethylene complex Cp
2Zr(CH
2=CH
2)(PMe
3) reacted with R
3EX (E=Si, Ge, Sn; R=Ph or Bu; X=Cl, OEt, or OER
3) to give R
3EEt in high yields after hydrolysis. The reaction mixture of the ethylene complex with Bu
3SnCl further reacted with phenylacetylene to give homoallyltin compounds. When the reaction mixture was treated with Ph
3SnCl or Ph
3GeCl instead of phenylacetylene, Ph
3SnEt or Ph
3GeEt was obtained in high yields after hydrolysis via the replacement of the β-SnBu
3 moiety.
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Hideki Sugimoto, Yoichi Sasaki
1998 Volume 27 Issue 3 Pages
197-198
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A new mono-oxo rhenium(V) complex with a chelating ligand amidophenolate was synthesized and structurally characterized. Significance of the protonation at the amido nitrogen was demonstrated by the large positive shift of the redox potential of Re(IV/III) in the presence of weak proton donors in acetonitrile.
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Taka-aki Okamura, Nami Nishikawa, Norikazu Ueyama, Akira Nakamura
1998 Volume 27 Issue 3 Pages
199-200
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Gallium(III)-substituted P-450 models, [Ga(OEP)(SAr)] (OEP=octaethylporphinato; SAr=S-2-CF
3CONHC
6H
4, SPh), were synthesized and the structures were determined by X-ray analysis. The gallium(III) complexes were found to be excellent structural analogues having a diamagnetic metal center.
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Narumi Sakagami, Ken-ichi Okamoto
1998 Volume 27 Issue 3 Pages
201-202
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A novel chromium(III)-neodymium(III) heteronuclear complex has been obtained by utilizing unsym-cis-[Cr(eddp)(ox)]
− as a building block. From the X-ray analysis, it is revealed that this complex is tetranuclear in which the Nd(III) ion is bridged by three oxalates in the three Cr(III) units and three water molecules forming a nine-coordinate tricapped trigonal-prism geometry.
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Kimiko Hashimoto, Takuya Yoshioka, Chikanori Morita, Mitsuru Sakai, To ...
1998 Volume 27 Issue 3 Pages
203-204
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A photoaffinity-labeling analog of alternariolide (AM-toxin I) which contains L-2-amino-5-[4-(1-azi-2,2,2-trifluoro)ethylphenyl]pentanoic acid (10) was synthesized.
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Fei Feng, Atsushi Aoki, Tokuji Miyashita
1998 Volume 27 Issue 3 Pages
205-206
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A high quality polymer LB film was newly prepared from adamantylacrylamide polymer without usual long alkyl chain. The measurements with XRD and cyclic voltammetry suggest that the polymer LB film with a thickness of 1.1nm and well defined molecular orientation is fabricated.
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Wei Li, Balamurugan Dhandapani, S. Ted Oyama
1998 Volume 27 Issue 3 Pages
207-208
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A single phase molybdenum phosphide, MoP, with a moderate surface area was prepared using temperature programmed reduction of an amorphous phosphate precursor and the so-prepared sample was found to be a good catalyst for hydrodenitrogenation.
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Qingjie Ge, Youmei Huang, Shuben Li
1998 Volume 27 Issue 3 Pages
209-210
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The stability of Cu-ZnO/HZSM-5 and Cu-ZnO-ZrO
2/HZSM-5 catalysts for syngas conversion to dimethyl ether has been evaluated using a fixed-bed flow microreactor at 290 °C, 40 atm, 1500 h
−1. ZrO
2 addition showed a marked improvement in the stability of catalyst.
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Masako Yamami, Hideki Furutachi, Takushi Yokoyama, Hisashi Okawa
1998 Volume 27 Issue 3 Pages
211-212
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A Zn
IIPb
II complex ZnPb(L)(H
2O)
2(ClO
4)
2 of a macrocyclic compartmental ligand L
2− is converted under alkaline conditions into a hydroxo complex ZnPb(L)(OH)(H
2O)ClO
4 that hydrolyzes tris-p-nitrophenyl phosphate (TNP) to bis-p-nitrophenyl phosphate (BNP
−) forming a BNP-bridged complex [ZnPb(L)(BNP)]ClO
4.
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Soichi Sato, Hiroshi Arakawa, Ernst Horn, Naomichi Furukawa
1998 Volume 27 Issue 3 Pages
213-214
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Bis(2,2′-biphenylylene)selenurane (1; λ
4-selane) reacts with xenon difluoride to give bis(2,2′-biphenylylene)difluoroperselenurane, [12-Se-6(C4F2)] (2; λ
6-selane), which was analyzed by single crystal X-ray diffraction.
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Toshiaki Yonemura, Ryoko Nakayama, Narumi Sakagami, Ken-ichi Okamoto, ...
1998 Volume 27 Issue 3 Pages
215-216
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The [Cr(edda or eddp)(N-N)]-type complexes (edda=ethylenediamine-N,N′-diacetate; eddp=ethylenediamine-N,N′-dipropionate), trans(O)-[Cr(edda)(phen)]Cl and csi(O)-[Cr(eddp)(phen)]Cl, were first prepared stereoselectively and characterized by UV-Vis absorption and IR spectra and X-ray crystal analysis. The optically active (−)
CD510-[Cr(edda)(phen)]
+ was readily racemized even in an acidic aqueous solution within a period of several hours.
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Hideo Kogure, Yuko Hoshida, Ken-ichiro Watanabe, Mutsumi Kimura, Kenji ...
1998 Volume 27 Issue 3 Pages
217-218
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Photochromic behavior of organostannyl complexes was studied. The addition of 2-aminomethylpyridine to Sn(IV)R
nX
4-n(n=1∼3) resulted in a reddish purple coloration and it showed the character of photochromism.
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Hiroaki Noma, Yoshio Adachi, Yoshihisa Matsuda, Takushi Yokoyama
1998 Volume 27 Issue 3 Pages
219-220
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This is the first report to show that the two
29Si-NMR signals (−86.3, −87.1 ppm) of Q
2 of natural and synthetic xonotlites were clearly split, which is in accord with the crystal structure study of Kudoh et al.
1 The
1H-NMR spectra were deconvoluted into three lines at 2.19, 1.86 and 5.26 ppm and assigned to structural Ca-OH, Si-OH and molecular water, respectively. The signal intensities are in good agreement with the thermogravimetric analysis.
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Yoshio Moriya, Nobuaki Ogawa, Tomokazu Kumabe, Hitoshi Watarai
1998 Volume 27 Issue 3 Pages
221-222
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External reflection UV-vis spectra of the interfacially adsorbed species of protonated tetraphenylporphyrin at toluene/aqueous sulfuric acid interface were successfully observed with clear negative absorption bands and without overlapping by the spectrum of the organic phase.
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Yasumasa Tomita, Aya Fuji-i, Hiroshi Ohki, Koji Yamada, Tsutomu Okuda
1998 Volume 27 Issue 3 Pages
223-224
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Super ionic conductor Li
3InBr
6 (σ=10
−3Scm
−1 at 297 K) due to lithium ions was synthesized and characterized by temperature dependence of the
7Li NMR T
1. The substitution effect of the cation and the temperature behavior of T
1 suggested that the high ionic conductivity resulted from the considerably disordered state of the cationic sublattice.
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Zhongdang Xiao, Ninping Huang, Minhua Xu, Zuhong Lu, Yu Wei
1998 Volume 27 Issue 3 Pages
225-226
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Asymmetric liposomes whose inner and outer layer with different materials, which are very useful in liposome and membrane research, have been prepared layer by layer from reverse micelles. In general, the diameters of the liposomes ranged from 30 nm to 100 nm. Fluorescein quenching experiment showed that asymmetric liposomes with inner layer being lipid and outer single-chain [(bpy)
2Ru(diazafluorenone)(CH
2)
15CH
3](PF
6)
2 had been success-fully prepared. The half-life of flip-flop of bilayer is estimated for 17 days. The method present is of significance in liposome and membrane study.
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Kiyotsugu Asai, Yukio Onouchi, Shin-ichi Inoue, Hiroshi Okamoto
1998 Volume 27 Issue 3 Pages
227-228
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The reaction of polyureas, prepared from the conventional diisocyanates and the α,ω-diaminopolyoxyalkylenes, with pyromellitic dianhydride in N-methyl-2-pyrolidone (NMP) at 165 °C leads to the formation of polyimide elastomers. The polyimide elastomers exhibited excellent physical properties.
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Masanobu Matsuguchi, Jun-Ichi Miura, Yoshiro Sakai
1998 Volume 27 Issue 3 Pages
229-230
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Sorption behavior of CO
2 in the photocrosslinked poly(vinyl cinnamate) film was examined. The amount of sorbed CO
2 was enhanced with the degree of crosslinking, while the amount decreased beyond ca.95% crosslinking.
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Toshihiko Okumura, Takashi Ikagawa, Takuhiro Otsuka, Youkoh Kaizu
1998 Volume 27 Issue 3 Pages
231-232
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In the previous letter,
1 we have reported on the cell-expansion and contraction of platinum(II) complexes under light irradiation and discussed the results in the term of the molecular structures in the excited states. For tris(2,4-pentanedionato)chromium and -aluminum(abbreviated as Cr(acac)
3 and Al(acac)
3, respectively), we also found the cell-expansion under light irradiation. The X-ray powder patterns of these complexes were shifted to low reflect-angle than original one by light absorption of the complexes. The shift of X-ray powder pattern of Al(acac)
3 is due to thermal cell-expansion caused by internal conversion of the molecule under light irradiation. In case of Cr(acac)
3, however, the shifts are due to not only the thermal cell-expansion but also another reason concerned with the structures in the excited states.
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Agus Haryono, Kenichi Oyaizu, Kimihisa Yamamoto, Junichiro Natori, Eis ...
1998 Volume 27 Issue 3 Pages
233-234
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Electroreduction of an oxo-bridged iron(III) porphyrin dimer adsorbed on an electrode surface produced solid state, cofacially fixed two iron(II) porphyrin molecules when immersed in aqueous acid, allowing an efficient catalysis of the four-electron reduction of O
2 to H
2O.
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Takakazu Yamamoto, Dharma Komarudin, Kenji Kubota, Shintaro Sasaki
1998 Volume 27 Issue 3 Pages
235-236
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Regioregular poly(3-hexylthiophene-2,5-diyl) and poly(4-heptylthiazole-2,5-diyl) form colloidal solutions in CHCl
3-CH
3OH mixtures; light scattering analysis and filtration experiments reveal that about 10
3 molecules of stiff poly(3-hexylthiophene-2,5-diyl) aggregate in a side-to-side stacking mode. The two polymers and related polymers are stacked in an end-to-end or interdigitation mode in the solid.
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Sumikazu Ogata, Yoshiharu Tasaka, Hideyuki Tagaya, Jun-ichi Kadokawa, ...
1998 Volume 27 Issue 3 Pages
237-238
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Organic-inorganic layered nano-hybrids were prepared by the reactions of amorphous Zn(OH)
2 with organic oxychlorides and organic carboxylic acids, and fibrous layered compounds were obtained by the reaction with bulky organic compounds.
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Kuniyuki Kishikawa, Norihiro Tokitoh, Renji Okazaki
1998 Volume 27 Issue 3 Pages
239-240
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An extremely hindered digermene (E)-Tbt(Mes)Ge=Ge(Mes)Tbt (2; Tbt=2, 4, 6-tris[bis(trimethylsilyl)methyl]phenyl; Mes=mesityl) was synthesized. The temperature dependent change of UV-vis absorptions of 2 in solution indicated the quantitative interconversion between 2 and the corresponding germylene 3. The thermodynamic parameters (ΔH=14.7 ± 0.2 kcal mol
−1 and ΔS=42.4 ± 0.8 cal mol
−1 K
−1) (1cal=4.184 J) for the dissociation of digermene 2 to germylene 3 were obtained from temperature dependence of the absorptions of 2.
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Chikako Takayama, Keiko Takeuchi, Masatsugu Kajitani, Toru Sugiyama, A ...
1998 Volume 27 Issue 3 Pages
241-242
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The reactions of cobaltadithiolene complexes bearing phenyl or ester ligands with tetracyanoethylene oxide (TCNEO) result in the formation of dicyanomethylene-bridged complexes, via dicyanomethylide intermediates. Furthermore, the reaction of cobaltadithiolene complex bearing 4-pyridyl ligands produces pyridinium dicyanomethylide complexes in good yields.
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Vakhid A. Mamedov, Lucia Kh. Gazizova, Ilsiyar Z. Nurkhametova, Aidar ...
1998 Volume 27 Issue 3 Pages
243-244
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The reaction of ortho-di (2) and monochloroacetoxybenzaldehyde (1) with
tBuOK and/or NaN(SiMe
3)
2 under Darzens conden-sation conditions leads to 2,2-dichloro-3-(2-hydroxyphenyl)-3-(2-formylphenoxy) propionic acid (3) and 3-chlorocoumarin (8) depending on number of chlorine atoms in the starting aldehydes (1, 2).
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Jun Kawai, Kouichi Hayashi, Kazuaki Okuda, Atsushi Nisawa
1998 Volume 27 Issue 3 Pages
245-246
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Silicon K X-ray fluorescence spectra of Si and SiO
2 single crystals are measured using a wave dispersive X-ray fluorescence spectrometer. It is demonstrated that the fine structures in the line shape of the low energy tail of the Kα characteristic X-ray fluorescence spectra resemble those of the K X-ray absorption near edge structure(XANES).
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Koji Yamaguchi, Keiji Ueno, Hiroshi Ogino
1998 Volume 27 Issue 3 Pages
247-248
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Reactions of FpSiCl(cat)(1:Fp=(η
5-C
5H
5)Fe(CO)
2, cat=o-O
2C
6H
4) with lithium 2-(dimethylaminomethyl)phenoxide(LiOAr
N) afforded FpSi(cat)(OAr
N) (2), while that with acetylacetone resulted in the formation of a mixture of a hexacoordinate silicon compound Si(cat)(acac)
2 (acac=η
2-CH
3COCHCOCH
3) and FpH. Structural determination of 2 by X-ray crystallography revealed that there is no interaction between the silicon atom and the dimethylamino group.
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Yuji Koga, Toshitake Kobayashi, Koichi Narasaka
1998 Volume 27 Issue 3 Pages
249-250
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A rhodium dinuclear carbonyl complex, [RhCl(CO)
2]
2, serves as a catalyst of the intramolecular Pauson-Khand reaction. 1,6-Enynes are converted to cyclopentenone derivatives in high yield by heating in the presence of the catalyst under an atmospheric pressure of CO.
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Hiroyuki Fujii, Hirofumi Sato, Michitaka Ohtaki, Koichi Eguchi, Hiromi ...
1998 Volume 27 Issue 3 Pages
251-252
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The CO
2 evolution rate for photocatalytic mineralization of alkyltrimethylammonium chloride sharply decreased when the mineralization yield became nearly equal to the proportion of the long alkyl carbon to the total organic carbon, suggesting that the photodecomposition rate of the alkyl chains is much faster than that of the trimethylammonium group. Moreover, the presence of Br
− significantly suppressed the initial CO
2 evolution rate, and resulted in incompleted mineralization with the final mineralization yield virtually equal to the proportion of the carbon atoms not attaching to the quarternary nitrogen.
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Takehiko Mori, Minoru Ashizawa, Masanobu Aragaki, Kyoji Murata, Yohji ...
1998 Volume 27 Issue 3 Pages
253-254
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Selenium analogues of TMET-TTP (2-(4,5-bisthiomethyl-1,3-dithiol-2-ylidene)-5-(4,5-ethylenedithio-1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene) 1b-d have been synthesized. The iodine salt (1b)
4I
3 exhibits moderately high conductivity (σ
rt=13S cm
−1) with semiconducting temperature dependence, and the donor arrangement is θ-type. The present θ-type salt as well as TMET-TTP salts is located at the insulating limit in the universal phase diagram of θ-phases.
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Takanobu Sanji, Kenkichi Sakamoto, Hideki Sakurai
1998 Volume 27 Issue 3 Pages
255-256
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Kinetics of the conformational transition of polysilanes was studied by monitoring the time dependent changes in UV absorption. The conformational change is regarded as a process of the crystallization and its time evolution in conformity to the scaling law with three-dimensional growth of the transition.
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Mengsu Yang, Richard Y. C. Kong, Najam Kazmi, Andrew K. C. Leung
1998 Volume 27 Issue 3 Pages
257-258
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Glass slides and silicon chips were modified with aminosilane and various linker molecules to provide activated surfaces for covalent immobilization of oligonucleotides under ambient condition, and the surface-attached oligonucleotides remain active for solid-phase DNA hybridization and polymerase chain reaction.
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Makoto Onaka, Ryota Yamasaki
1998 Volume 27 Issue 3 Pages
259-260
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Zinc ion-exchanged mesoporous aluminosilicate has been designed specifically to accelerate the Diels-Alder reaction between cyclopentadiene and poor dienophiles such as methyl acrylate and methyl methacrylate. Catalysis on this aluminosilicate is more effective than on a K 10-based solid acid catalyst.
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Hiroaki Shitara, Yoshio Aoki, Takuji Hirose, Hiroyuki Nohira
1998 Volume 27 Issue 3 Pages
261-262
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Optically active 2-methylchroman-2-carboxylic acid derivatives as new chiral dopants for nematic liquid crystals were prepared from optically active 6-benzyloxy-2-methylchroman-2-carboxylic acid, which was newly synthesized and resolved by diastereomeric salt formation method. The helical twisting power of the dopants was determined and the relationship with their structures were studied.
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Kunio Mochida, Rieko Hata, Hiromi Chiba, Shuhei Seki, Yohichi Yoshida, ...
1998 Volume 27 Issue 3 Pages
263-264
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Radical anions of permethylated oligogermanes, Me(Me
2Ge)
nMe (n=2,3,5, and 10) by pulse radiolysis technique showed two transient absorption bands in the UV-Vis and NIR regions. Their absorption maxima shifted to longer wavelengths with increasing the Ge-Ge chain in the permethylated oligogermanes.
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Tadahiro Kurosaka, Hiromi Matsuhashi, Kazushi Arata
1998 Volume 27 Issue 3 Pages
265-266
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An active and stable catalyst of 3 wt% Pt-added sulfated-zirconia for the dehydrogenative coupling of methane is obtained by impregnating zirconia gel with 0.5 mol dm
−3 H
2SO
4 followed by drying, impregnating the sulfated gel with a solution of H
2PtCl
6, calcining in air at 600 °C, and finally reducing in H
2 at 500 °C; this catalyst gave 40% conversion of the equilibrium value with 100% selectivity at 500 °C.
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Akito Ishida, Yoshiteru Sakata, Tetsuro Majima
1998 Volume 27 Issue 3 Pages
267-268
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Photocurrent was generated by surface plasmon excitation upon a porphyrin-modified gold film electrode using p-polarized light at 632.8 nm light in which electron transfer occurred from the excited porphyrin linked covalently to the gold electrode to a quencher such as molecular oxygen and methyl viologen in an aqueous solution.
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Tohru Nishinaga, Yoshiteru Izukawa, Koichi Komatsu
1998 Volume 27 Issue 3 Pages
269-270
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The energy barrier for ring inversion of the silepin annelated with bicyclo[2.2.2]octene was found to decrease as the electro-negativity of substituents on silicon increases.
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Yun-Pu Wang, Yao-Nan Xiao, Rong-Min Wang, Ying Mao
1998 Volume 27 Issue 3 Pages
271-272
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The modes and activities of the interaction of DNA and water-soluble polymer bound Schiff base nickel complex, which has been prepared by polymer analogous reaction, have been discussed according to fluorescent probe method. It indicates that polymer matrix effect and increasing solubility in water can increase the interaction of this polymer complex with DNA.
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Hong Meng, Wang-Lin Yu, Hsing Hua Huang, Wei Huang
1998 Volume 27 Issue 3 Pages
273-274
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The spectroscopic properties of a new synthesized conjugated polymer constituted of 3,3′-didecyl-2,2′-bithiophene and 2,6-di-1,3,4-oxadiazole-toluene moieties in the mixed solvent system of chloroform (solvent for the polymer) and methanol (non-solvent for the polymer) were studied. An unusual solvatochromism either in absorption or in emission was observed for the first time on conjugated polymers containing oxadiazole.
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Zhong-Ning Chen, Hua-Xin Zhang, Kai-Bei Yu, Bei-Sheng Kang
1998 Volume 27 Issue 3 Pages
275-276
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The zig-zag coordination chains [Cu
2(trans-oxen)(N
3)(Br)]
n[H
2oxen=N,N′-bis(2-aminoethyl)oxamide] with alternating bridges of trans-oxamidate and azide in bis-terdentate and end-on mode, respectively, are held together via axial Cu-Br linkage in a unique fashion to form an extended structure.
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Takeaki Iwamoto, Mitsuo Kira
1998 Volume 27 Issue 3 Pages
277-278
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Thermal isomerization of hexakis(t-butyldimethylsilyl)tetrasilabicylo[1.1.0]butane (2) to the corresponding tetrasilacyclobutene (1) as well as photochemical isomerization of 1 to 2 was confirmed using substituent-labeling experiments to proceed via 1,2-silyl-migration instead of skeletal isomerization.
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Hitoshi Watarai, Takashi Sakamoto, Satoshi Tsukahara
1998 Volume 27 Issue 3 Pages
279-280
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In a microcell with a two-dimensional quadrupole microelectrode, polystyrene particles showed positive and negative dielectrophoresis (DEP) in lower (1 k-18 kHz) and higher (32 k-1 MHz) ac frequency regions, respectively, whereas only positive DEP was observed for carbon particles in a whole region of 1 k-1 MHz frequency. These findings were quantitatively explained by the difference in the conductivity of both particles. A DEP separation between the two kinds of particles was attained at a 1 MHz frequency.
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