Shoichiro Yamada

Nippon Paper Industries (Japan)

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Cobalt(III) Complexes with N,N′-Ethylene-bis(salicylideneaminate) and a Related Quadridentate Ligand

Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry (1983)

Shoichiro Yamada Hiroaki Nishikawa Emiko Ohno K. YAMANOUCHI

Abstract Numerous six-coordinate cobalt(III) complexes with N,N′-ethylene-bis(salicylideneaminate) and N,N′-ethylene-bis [2-hydroxynaphthyl (1) -methyleneaminate], abbreviated as salen and nalen, respectively, have been synthesized and characterized. The complexes prepared are of the types [Co(salen)L2]X, MI [CoX2(salen)], [CoX(salen)H2O], [Co(nalen)L2] and [CoX(nalen)L], where X and L denote a univalent anion and a neutral unidentate li-gand, respectively. All these complexes are diamagne-tic and trans-six-coordinate.

10.1080/00945718308059328

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Citations (3)

AN ALGORITHM FOR GATE MATRIX FOLDING

International Symposium on Circuits and Systems (1989)

Shunichi Nakayama Shoichiro Yamada

Folding (DSP implementation)

Algorithm design

Matrix (chemical analysis)

Source

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Citations (2)

Analysis of a heuristic algorithm for planar assignment problem

Electronics and Communications in Japan (Part I Communications) (1987)

Shoichiro Yamada Katsumi Harashima Tamotsu Kasai

Abstract This paper describes a theoretical analysis of the heuristic algorithm for the efficient solution of (the linear) assignment problem defined on a plane. The evaluation function, or assignment cost, in the assignment problem discussed in this paper is defined as the square‐sum of Euclidean distances between points included in the two point sets. A heuristic assignment algorithm, based on a vertical or horizontal partitioning of the given plane, is presented. Then the average‐case analysis is performed for the algorithm, assuming that the points are distributed uniformly on the unit square plane. Letting the size of the point set be n , the number of partitioned stages in the algorithm be h m and the average assignment cost for n → ∞ be Ǐ, it is seen as a result of analysis that the rate of increase of Ǐ in regard to n decreases monotonously with the increase of h m . It is also seen that when h m is maximum, Ǐ is (1/4) log 2 . n . The result of theoretical analysis is compared with the result of experiment.

Unit square

Square (algebra)

10.1002/ecja.4410700601

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Citations (1)

Crystal Structures of Bis[N-(3-methoxysalicylidene)isopropylaminato]nickel(II) (Brown Room Temperature Phase) and -cobalt(II)

Bulletin of the Chemical Society of Japan (1976)

Tamaichi Ashida S. Iwata Takashi Yamane Masao Kakudo A. Takeuchi

Abstract The crystal structures of two Schiff base complexes, bis[N-(3-methoxysalicylidene)isopropylaminato]nickel (II) and -cobalt(II), have been determined. Ni complex: brown, room temperature phase, monoclinic, P21/c, a=21.089, b=7.254, c=14.386 Å, β=98.40°, Z=4, final R=0.076. Co complex: red, triclinic, P\bar1, a=22.699, b=7.395, c=14.099 Å, α=107.78, β=99.03, γ=93.75°, Z=4, final R=0.13. In both crystals the metal ions have distorted tetrahedral coordinations. The two crystals are roughly isostructural, although appreciable differences exist in both of the molecular and crystal structures. The Co complex gives a unique example of the methoxy group which sticks out nearly perpendicularly from the phenyl plane.

Triclinic crystal system

Monoclinic crystal system

Isostructural

Crystal (programming language)

10.1246/bcsj.49.3502

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Citations (15)

Transfer functions of three‐phase induction motors under stator voltage control by symmetrically triggered thyristors

Electrical Engineering in Japan (1979)

Tomoo Fujii Shoichiro Yamada

10.1002/eej.4390990614

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Citations (1)

Structure of Cupric Salts with Mono-, Di- and Tri-chloroacetic Acids

Nature (1958)

Ryutaro Tsuchida Shoichiro Yamada Hiroji Nakamura

Anhydrous

Chloroacetic acid

Absorption band

10.1038/181479b0

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Citations (14)

Synthesis and Properties of Copper(II) Perchlorate Complexes with Imino Oximes

Bulletin of the Chemical Society of Japan (1989)

Songping Wan Wasuke Mori Shoichiro Yamada Shun‐Ichi Murahashi

Abstract Three types of imino oxime copper(II) complexes were obtained by the reactions of copper(II) perchlorate with imino oximes (3-[2-[(alkylamino)ethyl]imino]-2-butanone oximes or 3-[2-[(dialkylamino)ethyl]imino]-2-butanone oximes, abbreviated as Hdox-enRR′). One type contains the dinuclear complexes [Cu2(dox-enRR′)2]2+ and uncoordinated perchlorate anions. The magnetic susceptibilities measured over the temperature range 77–320 K indicate that there exists a strong antiferromagnetic spin coupling interaction through the N–O bridge in these complexes. The magnetic behavior can be explained by using the Bleaney–Bowers equation. Complexes of the second type probably contain a square-tetranuclear complex. The copper(II) ions assume a penta-coordinated configuration with perchlorate anion coordinated at the axial coordination site. It is assumed that the dinuclear and mononuclear magnetic units coexist in the complexes of the third type. The plot of the magnetic susceptibilities versus temperature is linear in the two temperature ranges (T>250 K, <100 K).

Perchlorate

10.1246/bcsj.62.1859

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Citations (1)

ChemInform Abstract: SYNTH. UND EIGENSCHAFTEN VON METALLKOMPLEXEN MIT EINER NEUEN VIELZAEHNIGEN AETHER‐SAUERSTOFF‐ATOME ENTHALTENDEN SCHIFFSCHEN BASE

Chemischer Informationsdienst (1972)

Ichiro Murase Kuniko Yamanouchi Shoichiro Yamada

Abstract Äthylenglykol‐bis‐[2‐aminophenyläther] und Salicylaldehyd in Äthanol reagieren unter Rückfluß quantitativ zu der neuen Verbindung (I).

10.1002/chin.197242395

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Spectrochemical Study of Microscopic Crystals. II. Dichroism of Cobalt (III)-Praseo Salts

Bulletin of the Chemical Society of Japan (1952)

Shoichiro Yamada Ryutaro Tsuchida

Abstract The dichroisms of 1,6-[Co(en)2Cl2]Cl·HCl·2H2O and of 1,6-[Co(en)2Cl2]NO3 have been measured by the microscopic method. From consideration of the results, it has been presumed that, in the crystal of the hydrochloride, the line connecting Co with two Cl atoms is almost parallel to the b -axis, that the plane containing one Co and four N atoms of two ethylene-diamine molecules around Co is almost parallel to the plane formed by the a- and the c-axis. The nature of absorption bands of metallic complexes has been discussed on the basis of dichroism for the single praseo-ion, which has been determined from the above assumption. Arrangement of the complex ions in the nitrate has been inferred from observations as to the nature of dichroism in several faces. From comparison of the crystal structures of the two compounds and consideration of other properties, it has been suggested that the HCl molecule of crystallization in the crystal of the hydrochloride plays an important part in holding the complex ions together so that all the complex ions take the same orientation.

Crystal (programming language)

Dichroism

Hydrochloride

10.1246/bcsj.25.127

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Citations (40)

Spectrochemical Study of Microscopic Crystals. XIII. The Structure of Wolffram’s Red Salt, Pt(NH₂·C₂H₅)₄Cl₃·2H₃O and a Related Compound

Bulletin of the Chemical Society of Japan (1956)

Shoichiro Yamada Ryutaro Tsuchida

Abstract Polarized absorption spectra of Wolffram’s red salt, Pt(EA)4Cl3·2H2O, and a related compound, Pt(EA)4Br3·2H2O, EA being ethylamine, have been determined by Tsuchida-Kobayashi’s microscopic method in the regions covering from 2400 to 7500 Å. Both the compounds, which are supposed to be formulated by [Pt(EA)4][Pt(EA)4X2]X4·4H2O, have been found to show an absorption band that has not been observed with either of the components alone. Moreover, this band is strongly polarized along the needle axis. These relationships may be understood on the assumption that the crystals of these compounds involve infinite chains of ---X—PtIV—X---PtII---X—PtIV—X--- along the needle axis, X being chlorine or bromine. The new absorption at the longer wavelength may be considered as a charge transfer band along the infinite chains as assumed above.

Absorption band

Ethylamine

10.1246/bcsj.29.894

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Citations (47)