bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Reaction of 2-Ethoxy-1,3-oxathiolane with Carbonyl Compounds in the Presence of ZnCl2 or HgCl2
Authors: Tanimoto Shigeo , Jo Shigeo , Sugimoto Toyonari , Okano Masaya 
Published: July 2006

Abstract
In the reaction of 2-ethoxy-1,3-oxathiolane with carbonyl compounds in the presence of ZnCl2 or HgCl2, it has been found that only the breaking of the endocyclic bond (C–O or C–S bond) occurs, while the breaking of the exocyclic C–O bond to give the 1,3-oxathiolan-2-ium ion is unfavorable. This behavior is different from that of 2-ethoxy-1,3-dithiolane, in which the breaking of the endocyclic C–S bond occurs by means of HgCl2 and the exocyclic C–O bond, by means of ZnCl2.
“Anomalous” Raman Polarization as Observed in Anthracene Anion
Authors: Fujimoto Etsuko , Kamisuki Toshio , Maeda Shiro 
Published: July 2006

Abstract
An example of “anomalous” Raman polarization is presented by measuring the polarization dispersion of a resonant depolarized line of anthracene anion near the first absorption band. The molecular origin of the asymmetric Raman tensor is discussed on the basis of a vibronic effect associated with the resonant electronic level.
Kinetic Study of the Penetration of an Anthraquinoid Acidic Dye into Cationic Micelles
Authors: Miyashita Yuuji , Hayano Shigeo 
Published: July 2006

Abstract
The penetration of an anthraquinoid acidic dye into the micelle of a cationic surfactant, hexadecyltrimethylammonium bromide (HTAB), was studied kinetically by the stopped-flow method. The rate-determining step of this process was considered to be the dye reorientation from the micelle surface to its core. The apparent rate constants, kapp, of the dye penetration were determined by the first-order kinetics. The kapp values were a function of the surfactant micellar concentration. Above a certain micellar concentration (CMC) the kapp values become constant. The constant kapp was about 0.37–0.38 s−1 regardless of the total dye concentration. In the lower micellar concentration, there was a linear relationship between the kapp value and the number of the dye molecules which penetrated into a single micelle, n. This n was one of the factors which governed the dye penetration process.
Theoretical Treatment of Solvent Effects on the Frequency Shifts of Electronic Spectra of Anions
Authors: Abe Takehiro 
Published: July 2006

Abstract
A theoretical expression for the spectral solvent shifts of an anion has been presented by assuming the system to consist of a large anion, its counter cations, and numerous solvent molecules. In the zeroth-order all the component particles in the system do not interact with one another. The interaction energy among the particles for the ith-excited state of the system, in which only the anion is in the ith-excited state, is calculated by the second-order perturbation treatment as the sum of electrostatic interaction energies between pairs of particles. The expression derived from the difference between the interaction energies of the ground and excited states of the system contains the dipole-dipole and dipole-induced dipole interaction terms and the dispersion force terms and is somewhat different from the previous results for neutral solutes (Bull. Chem. Soc. Jpn., 38, 1314 (1965)). Effects of the counter cations are discussed. This expression is applied to the spectral shifts of an Eosin-Y2− anion, a Meisenheimer complex, and Janovsky complexes.
The Formation and Electronic Relaxation of Intermolecular Exciplex in the Vapor Phase
Authors: Hanashima Yukio , Itoh Michiya 
Published: July 2006

Abstract
The intermolecular exciplex formation and electronic relaxation of 1,4-dicyanonaphthalene (DCN) with pentamethylbenzene (PMB) in the vapor phase have been studied by means of nanosecond fluorescence spectroscopy. The exciplex formation and decay-rate constants were independent of the excitation energy, while the decay-rate constants of DCN fluorescence was dependent on the excitation energy. The rate constants of the exciplex formation and decay kinetics were discussed in comparison with the collisional relaxation rate of the upper vibrational states.
Magnetic Circular Dichroism Studies of 4,4′-Disubstituted Biphenyls
Authors: Uchimura Hiroyuki , Tajiri Akio , Hatano Masahiro 
Published: July 2006

Abstract
The magnetic circular dichroism (MCD) and ultraviolet (UV) absorption spectra of 4,4′-disubstituted biphenyls were measured. The MCD spectra showed diverse spectral patterns reflecting the natures of the substituent groups. These observed MCD spectra were reproduced by the theoretical calculations based on the Pariser-Parr-Pople-SCF-CI method. The dihedral angles of 4,4′-disubstituted biphenyls were estimated to be about 20° by comparing the observed MCD spectra with the calculated ones. The assignments for the MCD bands of 4,4′-disubstituted biphenyls were given on the basis of these calculations. The substituent effects of biphenyls were interpreted by the use of the coefficients of the configuration interactions.
Asymmetric Transformation of N-Acyl-Dl-amino Acids
Authors: Hongo Chikara , Yamada Shigeki , Chibata Ichiro 
Published: July 2006

Abstract
The asymmetric transformation which converted N-acyl-Dl-amino acids to the desired optically active isomers was studied. N-Acylamino acids such as N-butyrylproline, N-acetylleucine, and N-benzoylphenylglycine were easily racemized in the presence of a catalytic amount of acetic anhydride in melted states or in acetic acid or chloroform solutions. The racemic modification of these N-acylamino acids crystallized as a true racemic mixture suitable for optical resolution by a preferential crystallization procedure under the conditions of racemization. By combining preferential crystallization of the desired enantiomer by seeding from a supercooled melt or a supersaturated solution of a racemic modification and simultaneous racemization of the opposite isomer, N-acyl-Dl-amino acid was partially converted to an optically active isomer and the whole reaction mixture became optically active (10–40% enantiomeric excess).
Use of Propagators in the Hückel Model. IV. Chemical Reactivity in Radiation Field
Authors: Ohmae Takayuki , Nishikawa Kiyoshi , Deguchi Kisaburo , Aono Shigeyuki 
Published: July 2006

Abstract
The propagator approach is applied to chemical reactivity in the presence of radiation field. The Woodward-Hoffmann’s rule in photochemical reactions is generally derived. As an illustrative example, the ring closure or ring opening reactions are discussed.
The Formation Constants and Configurations of the Complexes of Cr(II), Mn(II), Fe(II), Co(II), Cu(II), and Zn(II) with 2,2′-Bipyridine and of Co(II) with 2,2′:6′,2″-Terpyridine in Hexamethylphosphoric Triamide
Authors: Abe Yuriko , Wada Goro 
Published: July 2006

Abstract
The absorption spectra and the first formation constants, K19 of complexes [M(bpy)]2+ (M(II)=Cr(II), Mn(II), Fe(II), Co(II), Cu(II), and Zn(II), bpy=2,2′-bipyridine) were determined spectrophotometrically in hexamethylphosphoric triamide(HMPA). The values of log K1 obtained were 4.61±0.02, 3.10±0.12, 4.82±0.04, 5.84±0.07, 7.33±0.02, and 1.77±0.07 for respective metal ions. The configurations of complexes [M(bpy)]2+ were discussed on the basis of these data. The K1 values of [Cr(bpy)]2+, [Mn(bpy)]2+, [Fe(bpy)]2+, and [Co(bpy)]2+ in HMPA are slightly larger than those in H2O, indicating that their configurations are tetrahedral, whereas the value of [Cu(bpy)]2+ in HMPA is slightly smaller than that in H2O, indicating that its configuration in HMPA is either square planar or tetragonal. It seems that [Zn(bpy)]2+ is octahedral in HMPA, because its K1 value is smaller about three orders of magnitude than that in H2O. In addition, the second formation constant, K2, of complex [Co(bpy)2]2+, and the first and second formation constants of complexes [Co(terpy)]2+ and [Co(terpy)2]2+ (terpy=2,2′:6′,2″-terpyridine) were also determined to be logK2=3.59±0.03 for the bpy complex, and logK1=4.87±0.01 and logK2=3.35±0.01 for the terpy complexes, respectively. These three complexes are concluded to be octahedral.
The Kinetics and Mechanisms of the Racemization of Tris(N,N′-dimethylethanediimine)iron(II)
Authors: Tachiyashiki Satoshi , Yamatera Hideo 
Published: July 2006

Abstract
Tris(N,N′-dimethylethanediimine)iron(II) (trivial name: tris(glyoxal-bis-N-methylimine)iron(II)1)), [Fe(gmi)3]2+, has been resolved for the first time, and its racemization mechanism has been investigated in acid solutions. A mechanism similar to that for tris(2,2′-bipyridine)iron(II) was verified from the acid dependence of the racemization rate. At 69.4 °C, 30% of the racemization proceeded by means of an intramolecular bondrupture mechanism and the remainder by means of an intramolecular twist mechanism. The activation enthalpy and the activation entropy for the twist path were 148(ΔH\eweq⁄kJ mol−1) and 110(ΔS\eweq⁄J K−1 mol−1) respectively. These values were compared with 127 and 114 for [Fe(bpy)3]2+ (bpy=2,2′-bipyridine) and with 119 and 91 for [Fe(phen)3]2+ (phen=1,10-phenanthroline). The racemization rate was larger in organic solvents, increasing in the order water&lt;nitromethane&lt;formamide&lt;dimethyl sulfoxide, which is the same as the order for the bpy and phen complexes. The rate was less dependent on the solvent in the order [Fe(phen)3]2+&gt;[Fe(bpy)3]2+&gt;[Fe(gmi)3]2+. A salt effect on the racemization rates was also observed.
The Solvent Extraction of Np(III) by Means of Bis(2-ethyhexyl)hydrogenphosphate in an Octane Solution and the Absorption Spectrum of the Organic Phase
Authors: Kawasuji Isamu , Satô Akiko , Suzuki Shin 
Published: July 2006

Abstract
Tervalent neptunium in an HClO4 solution was extracted by means of bis(2-ethylhexyl)hydrogenphosphate, HDEHP, in an octane solution. The oxidation state of neptunium in the organic phase was determined by spectrophotometry. The intense peak in the absorption spectrum of tervalent neptunium was found at 348 nm, this peak was attributed to the f→d transition. The oxidation rate of the Np(III)–HDEHP complex in an oxygen-free octane solution was about 10%/h.
Kinetics of the Oxidation of N-(2-Hydroxyethyl)ethylenediamine-N,N′,N′-triacetate Complex of Di-μ-oxo-bis[oxomolybdenum(V)] with Hexachloroiridate(IV) and μ-Hyperoxo-bis[pentaamminecobalt(III)] Ions in Aqueous Media
Authors: Sasaki Yoichi , Kawamura Reiko 
Published: July 2006

Abstract
Kinetics of outer-sphere oxidations of [Mo2vO4(hedta)(H2O)]− (1) (H3hedta=N-(2-hydroxyethyl)ethylenediamine-N,N′,N′-triacetic acid) with [IrIVCl6]2− ([H+]=10−5.8–0.10 M (1 M=1 mol dm−3); ionic strength, I=0.1 M (adjusted with LiClO4); 25–45 °C) and with [(NH3)5CoIII(μ-O2(−))CoIII(NH3)5]5+ ([H+]=0.01–0.30 M; I=0.1 and 2.0 M; 10–30 °C), were studied under pseudo-first-order conditions (the reductant in large excess). The following reaction scheme is consistent with the observed rate laws:
1\oversetKa\ightleftharpoons[Mo2vO4(hedta)(OH)]2− (2)+H+
1+[IrIVCl6]2−\xrightarrowk(a)(MovMoVI)+[IrIIICl6]3−
2+[IrIVCl6]2−\xrightarrowk(b)(MoVMoVI)+[IrIIICl6]3−
1+[μ−O2−]5+\oversetKIP(a)\ightleftharpoonsIP(a)(ion-pair)
2+[μ−O2(−)]5+\oversetKIP(b)\ightleftharpoons+IP(b)(ion-pair)
IP(b)\xrightarrowke(b)(MoVMoVI)+[μ−O2(2−)]4+
(MoVMOVI)+oxidant\xrightarrowfast2(Mo(VI)).
At 25 °C and I=0.1 M, Ka, k(a), k(b), kIP(a), KIP(b), and ke(b) are 7.9×10−4 M, 23 M−1 s−1, 1.11×104 M−1 s−1, 40.5 M−1, 1046 M−1, and 2.56 s−1, respectively. Activation parameters for the k(b) path are ΔH\eweq=38±8 kJ mol−1 and ΔS\eweq=−25±29 J K−1 mol−1. The product ke(b)KIP(b)Ka is 7.35×10−2 s−1 at 25 °C and I=2.0 M, and the corresponding activation parameters are ΔH\eweq=67±8 kJ mol−1 and ΔS\eweq=−34±29 J K−1 mol−1. The oxidation of 2 is ca. 104 times as fast as that of 1. The results are compared with the oxidation reactions of other Mo2VO42+-complexes.
Studies on Electronic Spectrum and Electron Spin Resonance of Vanadium(IV) Complexes with Organophosphorus Compounds and High Molecular Weight Amines
Authors: Sato Taichi , Nakamura Takato 
Published: July 2006

Abstract
In the extraction of vanadium(IV) from aqueous solutions containing hydrochloric acid and/or a mixture of hydrochloric acid and lithium chloride by bis(2-ethylhexyl) hydrogenphosphate (DEHPA; HX), trioctylmethylammonium chloride (Aliquat-336), trioctylamine (TOA), trioctylphosphine oxide (TOPO) and tributyl phosphate (TBP), the complexes formed in the organic phases have been examined by spectrophotometry and electron spin resonance spectroscopy. It is found that in the extraction by DEHPA, the vanadium in the organic phase exists as the monomeric species, VO(X2H)2, or the polymeric one, (VOX2)n, and that in the extractions by Aliquat-336, TOA, TOPO, and TBP, tetravalent vanadium complexes are stable in the organic phases extracted from a mixed solution of hydrochloric acid and lithium chloride, while complexes containing pentavalent vanadium and VOV4+ ions are formed in the organic phases extracted from hydrochloric acid solutions.
Synthesis and Magnetic Properties of Octaethylporphyrinatoiron(III) Perchlorate and Its Mono(amine) Adduct. Intermediate-spin State (S=3/2) Model for Ferricytochrome c′
Authors: Ogoshi Hisanobu , Sugimoto Hiroshi , Watanabe Ei-ichi , Yoshida Zen-ichi , Maeda Yutaka , Sakai Hiroshi 
Published: July 2006

Abstract
Octaethylporphyrinatoiron(III) perchlorate, its mono(pyridine) and mono(4-substituted pyridine) adducts and bis(tetrahydrofuran)octaethylporphyrinatoiron(III) perchlorate were prepared to mimic the ferricytochrome c′. Magnetic susceptibilities, M\ddotossbauer spectra, and ESR spectra have been measured. Magnetic properties in the crystalline state revealed; (i) Octaethylporphyrinatoiron(III) perchlorate, OEPFeIIIClO4 and bis(tetrahydrofuran)octaethylporphyrinatoiron(III) perchlorate, OEPFeIII(THF)2ClO4 are of intermediate-spin state (S=3/2). (ii) Magnetic susceptibilities and M\ddotossbauer parameters of mono (pyridine) and mono(4-substituted pyridine)octaethylporphyrinatoiron(III) perchlorate, OEPFeIII(4-X-py)ClO4 [X=CHO, X=CN, and X=H] are rather similar to those of the low-spin(S= 1/2) states. Absorption spectra showed that octaethylporphyrinatoiron(III) perchlorate is of intermediate-spin state in dichloromethane solution, but of high spin state in acetone solution. Close spectral resemblance of these complexes to the ferricytochrome c′ at physiological pH suggests that the latter is in intermediate-spin state.
Preparation and Physicochemical Properties of Tervalent Cobalt Complexes of Porphyrins
Authors: Sugimoto Hiroshi , Ueda Nobuhiro , Mori Masayasu 
Published: July 2006

Abstract
Tervalent cobalt complexes of octaethylporphyrin (OEP) and tetraphenylporphyrin (TPP), [CoIII(OEP)(H2O)2]X (X=ClO4, BF4), [CoIII(OEP)(THF)2]ClO4, [CoIII(TPP)(H2O)2]X (X=ClO4), and [CoIII(TPP)(H2O)Y] (Y=Cl, Br, SCN, N3) were synthesized. Molecular weight measurements indicate that only [CoIII(TPP)(H2O)2]BF4 and [CoIII(TPP)(H2O)2]ClO4 aggregate at higher concentrations in chloroform. In polar solvents such as methanol, all are monomeric. In nonpolar solvents, all the complexes show Soret bands at shorter wavelengths and somewhat paramagnetic 1H NMR spectra; these anomalies are absent in polar solvents. Tetrafluoroborates and perchlorates react with ethyl vinyl ether smoothly to form 2,2-diethoxyethylcobalt(III) complexes which are easily converted to formylmethylcobalt(III) complexes. 1H NMR and absorption spectra of the amine adducts prepared in this study, [CoIII(OEP)(L)2]ClO4 (L=pyridine, 2-methylimidazole) and [CoIII(TPP)(L′)2]ClO4 (L′=pyridine, 4-cyanopyridine, 4-methylpyridine), indicate that the two amine molecules coordinate to the central cobalt atom. As regards redox potentials for the Co(III)/Co(II) couple as measured by cyclic voltammetry, the cobalt(III) porphyrins are categorized into three groups: (i) BF4 and ClO4 salts with redox potentials at about 0.7 V; (ii) halides and pseudohalides with those at 0.2–0.3 V; and (iii) bis(amine) adducts with those at −0.3–+0.1 V. In polar solvents, however, the redox potentials of (i) and (ii) are very similar to one another.
Neighboring Effect of Mercapto Group in the Silver Ion-promoted Aminolysis of S-Monoacyldihydrolipoamide
Authors: Nambu Yoko , Endo Takeshi , Okawara Makoto 
Published: July 2006

Abstract
The aminolysis of N-benzyl-8-S-(p-nitrobenzoyl)dihydrolipoamide has been enhanced remarkably with excess silver perchlorate compared with that of N-benzyl-S,S′-bis(p-nitrobenzoyl)dihydrolipoamide. From the results of kinetics and complex formation followed by UV and IR spectra, the large enhancement in the reaction has been concluded to be derived from the activation of acyl group through the binding of two equivalents of silver ion to the neighboring mercapto group.
Electrochemical Conjugate Additions of the Allyl Groups in Substituted Allyl Halides to α,β-Unsaturated Esters
Authors: Satoh Shohei , Suginome Hiroshi , Tokuda Masao 
Published: July 2006

Abstract
Electrolysis of allyl halides and diethyl fumarate (2) in N,N′-dimethylformamide containing 0.2 M† tetraethylammonium tosylate gave a conjugate addition product, ethyl 3-(ethoxycarbonyl)-5-hexenoate, in a moderate yield. The electrochemical reaction of 1-chloro-3-methyl-2-butene (4) with 2, that of allyl chloride 4 with methyl crotonate (6), and that of methyl 4-halo-2-butenoate with 2 likewise gave the corresponding conjugate addition products, ethyl 3-(ethoxycarbonyl)-6-methyl-5-heptenoate, methyl 3,4,4-trimethyl-5-hexenoate, and ethyl 3-(ethoxycarbonyl)-4-(methoxycarbonyl)-5-hexenoate, respectively. The addition reaction of 4 to 2 takes place at the α-carbon terminus of 4 exclusively, whereas the addition of 4 to 6 at the γ-carbon terminus of 4. These regioselectivities of the additions and pathways of the reactions are discussed.
Reduction by a Model of NAD(P)H. 35. Spectroscopic Detection of Charge-transfer Intermediate
Authors: Ohno Atsuyoshi , Yamamoto Hiroyuki , Oka Shinzaburo 
Published: July 2006

Abstract
4,4-Disubstituted 1,4-dihydropyridine derivatives are employed as models of NAD(P)H. Electronic and ESR spectroscopies have proved that these models form charge-transfer complexes with certain substrates, which supports a mechanism of the reduction with 1,4-dihydronicotinamide derivatives to be initiated by initial electron-transfer.
Synthesis and Kinetic Investigation of the Atropisomerization of meso-Tetra(2-cyanophenyl)porphine
Authors: Hatano Keiichiro , Anzai Kazunori , Kubo Tadashi , Tamai Shoko 
Published: July 2006

Abstract
Tetra(2-cyanophenyl)porphine (ToCNPP) has been synthesized and isolated into the four respective atropisomers. The rotation of a cyanophenyl ring about the bond to the methine carbon of the porphyrin leads to interconversion reactions among the isomers. The isomerization reactions have been studied kinetically by the separation and quantitative measurement of each isomer on thin layer chromatography plates. The results show that the free energy of activation for the hindered rotation is an average of ΔG*=110 kJ/mol at 50 °C. This is the highest barrier ever measured in similar porphyrin atropisomers. The apparent interaction between adjacent cyano groups is observed. The energy of interaction is estimated to be about 2.0 kJ per mole unit of interaction.
Asymmetric Synthesis of Axially Dissymmetric 1,1′-Binaphthyls via an Intramolecular Ullmann Coupling Reaction of (R)- and (S)-2,2′-Bis(1-bromo-2-naphthylcarbonyloxy)-1,1′-binaphthyl
Authors: Miyano Sotaro , Tobita Masayuki , Hashimoto Harukichi 
Published: July 2006

Abstract
An Ullmann reaction of the chiral bifunctional substrate containing two 1-bromo-2-naphthyl moieties, (S)-2,2′-bis(1-bromo-2-naphthylcarbonyloxy)-1,1′-binaphthyl, gives an intramolecularly coupled 12-membered cyclic diester in a 36% isolated yield. The intramolecular coupling reaction proceeds with virtually complete dia-stereoselectivity to induce S-chirality into the newly formed bond between the two naphthyl units.
The Biotransformation of Foreign Substrates by Tissue Cultures. I. The Hydroxylation of Linalool and Its Related Compounds with the Suspension Cells of Nicotiana tabacum
Authors: Hirata Toshifumi , Aoki Tadashi , Hirano Yoshio , Ito Takashi , Suga Takayuki 
Published: July 2006

Abstract
It was found that the tissue cultures of Nicotiana tabacum “Bright Yellow” possess the ability to transform selectively the trans-methyl group in the 3-methyl-2-butenyl group of such foreign substrates as linalool and the related compounds into the hydroxymethyl group. Also, the cultures were found to have the ability to hydrolize the acetoxyl group of their acetates.
Muramyl Dipeptide Derivatives with Multiprenylacetyl Group. Synthesis and Immunological Activities
Authors: Fukuda Tsunehiko , Kobayashi Shigeru , Yukimasa Hidefumi , Terao Shinji , Fujino Masahiko , Shiba Tetsuo , Saiki Ikuo , Azuma Ichiro , Yamamura Yuichi 
Published: July 2006

Abstract
Several linear and branched all-trans-multiprenylacetic acids were synthesised, and introduced to the 6 position of the sugar moiety of muramyl dipeptide and its analog, via an amino acid as a linking unit. Compared with the saturated stearoyl derivative, all the compounds having a multiprenylacetyl group exhibited more potent adjuvant activity on the induction of delayed-type hypersensitivity to N-acetyl-3-(4-arsonophenylazo)-l-tyrosine. The derivatives with larger branched side chains tended to have increased activity.
Neighboring Group Participation in Solvolysis. XIII. Kinetic Isotope Effects in Solvolysis of 2-Arylethyl p-Nitrobenzenesulfonates
Authors: Yukawa Yasuhide , Ando Takashi , Token Katsuo , Kawada Mitsuru , Matsuda Kenichi , Kim Seung-Geon , Yamataka Hiroshi 
Published: July 2006

Abstract
Carbon-14 kinetic isotope effects (k12⁄k14) were determined for the solvolysis of phenethyl (1a) and 2-(p-methoxyphenyl)ethyl (1b) p-nitrobenzenesulfonates in acetic, formic, and trifluoroacetic acids. Phenyl-1 carbon effects were all in the range of 1.02–1.04 except for the acetolysis of 1a (k12⁄k14=1.005), which has been proved to proceed mainly via the aryl unassisted (ks) pathway. In all other reactions, which proceed mainly via the aryl assisted (kΔ) pathway, the phenyl-1 carbon apparently changes its bonding in the transition states. A large α-carbon effect (1.131) and a small β-carbon effect (1.013) as well as a medium phenyl-1 effect (1.022) were observed for the formolysis of 1b, whose mechanism is thought to be exclusive kΔ without troublesome ion-pair return. These observations, together with α- and β-deuterium effects reported already, enabled us to describe the qualitative nature of the bridged transition-state structure of the kΔ pathway, i.e., advanced Cα–O bond rupture, slight Cα–CPh−1 bond formation, Cα–Cβ double bond formation, slight Cβ–CPh−1 bond rupture, and breakdown of aromaticity at the phenyl-1 position. These characteristics are very similar to those of the phe-nonium ion.
Circular Dichroism of Chromium(III) Complexes. VII. Circular Dichroism in the Spin-forbidden Transitions of cis-[Cr(N2)(O)4] Type Complexes with Ethylenediaminetetraacetate Analogues
Authors: Kaizaki Sumio , Mori Hisako 
Published: July 2006

Abstract
Potassium (2S,4S)-2,4-pentanediaminetetraacetatochromate(III) monohydrate was newly prepared and was found to be formed stereospecifically with a Λ(ΛΔΛ) absolute configuration as has been revealed for the corresponding Co(III) complex. The circular dichroism spectra in the spin-forbidden transitions of this new complex along with the known analogues, (−)589-ethylenediamine-N,N′-diacetato-N,N′-dipropionatochromate(III) and (+)589-(S,S)-2,2′-(ethylenediimino)disuccinatochromate(III) complexes, were measured and discussed in comparison with those in the first spin-allowed transitions on the basis of the theoretical relations between the rotational strengths for the spin-forbidden and the spin-allowed transitions in trigonal and tetragonal fields.