bluuebunny/crossref_metadata_2025_split huggingface dataset:
Crystal Structure and Photochemistry of Isopolymolybdates. I. The Crystal Structures of Hexakis(propylammonium)heptamolybdate(VI) Trihydrate and Hexakis(isopropylammonium)heptamolybdate(VI) Trihydrate
Authors: Ohashi Yuji , Yanagi Kazunori , Sasada Yoshio , Yamase Toshihiro 
Published: July 2006

Abstract
The crystal structures of (NH3CH2CH2CH3)6[Mo7O24]·3H2O and (NH3CH(CH3)2)6[Mo7O24]·3H2O have been determined by X-ray analysis. The crystal of the propylammonium salt is triclinic; the space group is P\bar1; Z=2, with a=14.118(2), b=15.977(2), c=11.368(1) Å, α=90.23(1), β=93.00(1), γ=111.79(1)°. That of the isopropylammonium salt is monoclinic; the space group is P2/n; Z=4, with a=23.904(6), b=10.504(1), c=20.652(9) Å, and β=115.40(2)°. The structures were deduced by the direct method and refined by the block-diagonal least-squares technique. The final R values were 0.035 for 8084 observed reflections of the former and 0.060 for 9934 of the latter. The heptamolybdate anion of the two crystals has an approximate 2mm symmetry and its structure is similar to that observed in the crystals of the ammonium, potassium and sodium salts. The propyl- and isopropylammonium cations form some hydrogen bonds to the bridging oxygens of the heptamolybdates. Such hydrogen bonds play an important role in the UV-induced photochromism of these crystals.
Structure and Properties of Diaquabis(ethylthioacetato)copper(II), [Cu(C4H7SO2)2(H2O)2]
Authors: Ogawa Takashi , Shimoi Mamoru , Ouchi Akira 
Published: July 2006

Abstract
The crystal and molecular structure of the title complex has been determined by the X-ray diffraction method. The crystal was triclinic, space group P\bar1, a=7.554(1), b=9.001(1), c=5.345(1) Å, α=104.83(1), β=99.20(1), γ=71.02(1)°, Z=1, DX=1.684(1), Dm=1.69(1) Mg m−3, μ(Mo Kα)=2.03 mm−1, and the final R value was 0.030 for 1818 reflections. The molecular arrangement has a center of symmetry and has a slightly distorted octahedral configuration around the central copper(II) atom; each ethylthioacetato ligand forms a chelate ring by coordinating through a sulfur atom and a carboxyl oxygen atom, and two water molecules are also coordinated to the central metal. The solid complex is deep green, different from the diaquabis(alkylthioacetato)copper(II) complexes of the higher alkyl groups (number of C≥3), and it is likely due to the CT band caused by the strong copper–sulfur bond in the complex.
Symmetrized Local Mode Analysis of CH2 Stretching Mode in 1,1-Dichloroethylene
Authors: Tamagake Keietsu , Hyodo Shi-aki , Fujiyama Tsunetake 
Published: July 2006

Abstract
A symmetrized local mode (SLM) model based on the two dimensional Morse oscillator was developed and applied to the analysis of the spectrum of the CH stretching modes in 1,1-dichloroethylene in the range of 3000–17000 cm−1. More than twelve absorption peaks were assigned in terms of the mixed SLM states. The calculated frequencies with finally determined parameters: ωe=3191.6 cm−1, ωeχe=57.63 cm−1, and f12=2170 cm−1 agreed well with the observed ones. The kinetic coupling was found to be more responsible for the mixings between SLM states than the potential coupling. The observed intensity data were analyzed by the use of the obtained mixing coefficients and the two dimensional dipole moment function parameters: M1, M2, M12, and θ. The finally determined dipole moment function parameters were: M1=−0.290 D Å−1, M2=−0.875 D Å−2, M12=−0.386 D Å−2, and θ=38.4°. Careful examination of the influence of M12 upon the integrated intensities clarified the validity of the one dimensional intensity analysis of our preceding work. An SLM representation was confirmed to be useful for the systematic analysis of the CH stretching spectrum through the fundamental and the high v local mode bands which include highly structured low v summation bands. An SLM representation was also found to be convenient for making a simple correlation between local mode and normal mode pictures.
Interaction between Ethidium Bromide and Various Polyelectrolytes and DNA with Emphasis on Spectral Characteristics and Binding Curves of the Bound Dye
Authors: Yamaoka Kiwamu , Matsuda Takumi , Shiba Daisuke , Takatsuki Mineo 
Published: July 2006

Abstract
Visible and ultraviolet absorption spectra of ethidium bromide (EB) were measured by the optical titration method in the presence of each of three synthetic polyelectrolytes—sodium salts of poly(p-styrenesulfonate) (NaPSS), polyphosphate (NaPP), and polyacrylate (NaPA)—and native and heat-denatured DNA at 25 °C. By use of the principal component analysis (PCA) method, the number of EB species present in each EB–polymer system was determined to be two, i.e., free and bound EB, in the range of the polymer residue-to-EB ratio between zero and about one. The spectrum and the fraction of EB species bound to each polymer were determined by the extended PCA method. The bound-EB spectra are bathochromic and hypochromic relative to the spectrum of free EB, but they show no metachromasy band. The apparent binding constants Ka for EB bound to polymers are in the order of NaPSS&gt;denatured DNA&gt;NaPP&gt;NaPA\fallingdotseqnative DNA.
Relation between Exchange Interaction and Crystal Structure of Verdazyl Radicals. As Studied by Means of McConnell’s Spin Density Hamiltonian
Authors: Azuma Nagao 
Published: July 2006

Abstract
The exchange interactions in four kinds of verdazyl crystals, 2,4,6-triphenylverdazyl (TPV), 2,4,6-triphenyl-3-methylverdazyl (MeTPV), 2,4,6-tri-p-tolylverdazyl (TTV), and 2,6-di-p-tolyl-4-phenylverdazyl (DTPV), have been studied by means of McConnell’s spin density Hamiltonian. The calculated exchange parameters, J, have been compared with the experimental values derived from the magnetic susceptibilities. The observed order of J’s J⁄k=−5.4 (TPV), −9.1 (MeTPV), −11.1 (DTPV), and 0–−0.3 K (TTV), can be qualitatively explained by the following equation:
J∝\undersetijΣ (−1⁄rij)ρilρjl+1,
where ρil and ρjl+1 are π-spin densities on atoms i and j of the l-th and (l+1)-th molecules in the crystallographic column and rij is the interatomic distance between atoms i and j. The magnetic susceptibility data of MeTPV and TTV between 1.6 and 300 K are presented and interpreted with the Heisenberg linear chain model. The susceptibility of DTPV is re-interpreted in the same framework as above.
Paramagnetic Cobalt(III) Complexes with Organic Ligands. VII. The Isolation and Properties of Paramagnetic Tetraammine(5-nitrososalicylato)cobalt(III) Complexes
Authors: Yamamoto Yoshihisa , Kudo Hiroko , Mori Masayasu , Konno Hidetaka 
Published: July 2006

Abstract
The title paramagnetic complexes, [Co(5-NOsal)(NH3)4]X2·nH2O (X2=Cl(NO3), Cl2·HCl, and Cl2), all brown in color, have been isolated and characterized by analytical, spectroscopic, and magnetic methods. The effective magnetic moments of the complexes are 1.6–1.8 BM, and the absorption spectra have two peaks, at 387 and 518 nm. In the XPS of the complex, the cobalt 2p peaks have satellites, and the peak of the nitrogen Is could be deconvoluted to that of NH3 nitrogen at 400.2 eV and to that of NO nitrogen at 402.2 eV. This binding energy of the NO nitrogen of the complex is different from that (405.6 eV) of the NO2 nitrogen of the green Paramagnetic tetraammine(5-nitrosalicylato)cobalt(III) complexes, [Co(5-NO2sal)(NH3)4]X2, and establishes the difference between these two series of complexes.
A Hypervirial Theorem Aspect of Koopmans’ Theorem
Authors: Isihara Makoto 
Published: July 2006

Abstract
Koopmans’ theorem is interpreted as a hypervirial theorem requirement; the implication of Koopmans’ theorem is thereby clarified. A hypervirial theorem standpoint gives a physically sound ground to a leading correction of Koopmans’ relation. Attention is paid to the orbital ambiguity associated with the correction, a possible utilization of the ambiguity being suggested.
Cobalt(III) Complexes with Tripodlike Quadridentate Ligands. II. Preparations, Absorption Spectra and Circular Dichroism of (Amino carboxylato or 1,2-diamine)[N,N-bis(2-aminoethyl)glycinato]cobalt(III) Complexes
Authors: Akamatsu Keiji , Komorita Takashi , Shimura Yoichi 
Published: July 2006

Abstract
Four glycinato, six l-alaninato, and three (R)-propylenediamine cobalt(III) complexes of a tripodlike quadridentate ligand, N,N-bis(2-aminoethyl)glycinate have been prepared. The geometrical configurations are assigned on the basis of their absorption and circular dichroism spectra, 1H-NMR spectra, the elution behavior in ion-exchanger column chromatography, and the optical resolution of chiral isomers. The absolute configurations of the chiral complexes are tentatively assigned and the characteristics of the tripodlike ligand are discussed.
Enthalpy of Oxidation-Reduction for the Ethylenediaminetetraacetatocobaltate(III/II) Couple Relative to the Hydrogen Ion Formation
Authors: Doi Kunio 
Published: July 2006

Abstract
Oxidation of ethylenediaminetetraacetatocobaltate(II) with permanganate ion has been studied spectrophotometrically. The first step in the oxidation is the rapid formation of [CoIII(edta)(H2O)]−, followed by the ring closure reaction of the complex to [CoIII(edta)]−. On the basis of the spectrophotometric result, the enthalpies of the reactions, [CoII(edta)]2−+1/5 MnO−4+8/5 H+→[CoIII(edta)(H2O)]−+1/5 Mn2++4/5 H2O and [CoIII(edta)(H2O)]−→[CoIII(edta)]−+H2O, have been determined at 25 °C and at an ionic strength of 0.1 by a direct thermometric titration procedure. The enthalpy of the reaction, [CoIII(edta)]−+1/2 H2\ightleftharpoons[CoII(edta)]2−+H+, has been calculated by combining them with some other calorimetric data. The thermodynamic functions for formation of the [CoIII(edta)]− complex are estimated from the values so far reported. At 25 °C and at an ionic strength of 0.1 ΔG=−242 kJ mol−1, ΔH=−101 kJ mol−1, and ΔS=474 J mol−1 K−1.
Solvent Extraction Study on the Hydrolysis of Tracer Concentrations of Bismuth(III) in Perchlorate and Nitrate Solutions
Authors: Hataye Itsuhachiro , Suganuma Hideo , Ikegami Hisashi , Kuchiki Takashi 
Published: July 2006

Abstract
The backward solvent extraction with dithizone-carbon tetrachloride solutions was used to examine the chemical species of Bi(III). A tracer concentration of Bi(III) (&lt;10−7 mol dm−3) was found to exist in the form of Bi3+, Bi(OH)2+, Bi(OH)2+, and Bi(OH)3 in 1.0 mol dm−3 (H,Na)ClO4, and Bi(NO3)n3−n, Bi(OH)(NO3)n2−n, Bi(OH)2(NO3)n1−n, and Bi(OH)3(NO3)nn− in 1.0 mol dm−3 (H,Na)NO3 solutions depending on the acidity of the solutions. The constants of successive hydrolysis, β1, β2, and β3, were calculated by using the distribution data. The resulting logβ1, logβ2, and logβ3 values were 12.0, 22.9, and 33.9 for 1.0 mol dm−3 (H,Na)ClO4 solution, and 11.9, 22.7, and 33.2 for 1.0 mol dm−3 (H,Na)NO3 solution, respectively. The chemical composition of the extracted species was most probably Bi(HDz)3.
The Reaction of Bis(dimethylglyoximato)(pyridine)cobalt(I), Cobaloxime(I), with 2-(Allyloxy)ethyl Halides and the Photolysis of the Resulting Organo-cobaloximes
Authors: Okabe Masami , Tada Masaru 
Published: July 2006

Abstract
The reactions of 2-(allyloxy)ethyl halides with cobaloxime(I) gave (tetrahydro-3-furanyl)methylcobaloximes via an electron transfer from cobaloxime(I) to the halides to give radical anions. The rupture of a halide ion to give an organic radical and the ring closure to give a (tetrahydro-3-furanyl)methyl radical are followed by the radical coupling between the organic radical and the cobaloxime(II). The structures of the organo-cobaloximes were determined by the analyses of the photolysis products under aerobic or anaerobic conditions.
An MO Theoretical Study of the Photochemical Reaction of Alkanenitronate Anions to Form Hydroxamic Acids
Authors: Kikuchi Osamu , Kanekiyo Takazumi , Tanaka Seiji , Naruchi Kiyoshi , Yamada Kazutoshi 
Published: July 2006

Abstract
The reaction mechanism of the photochemical reaction of alkanenitronate anions to form hydroxamic acids was explored on the basis of the potential energy curves obtained by means of MINDO/3 CI calculations. The O-oxaziridine was calculated to be not an intermediate, but an unstable transient species in this photoreaction. This is different from the photoisomerization of methyleneamine N-oxide derivatives into the corresponding amides, in which the oxaziridine is considered to be an intermediate. The proposed reaction mechanism elucidates well the regioselectivity observed in the photochemical formation of hydroxamic acids from nitronate anions.
Reactivities of Stable Rotamers. VIII. Difference in Reactivities of 1,2,3,4-Tetrachloro-9-(2-halo-1,1-dimethylethyl)triptycene Rotamers in Lewis Acid-catalyzed Reactions
Authors: Kikuchi Hiromi , Seki Shigetaka , Yamamoto Gaku , Mitsuhashi Tsutomu , Nakamura Nobuo , Oki Michinori 
Published: July 2006

Abstract
±sc-1,2,3,4-Tetrachloro-9-(2-chloro-1,1-dimethylethyl)triptycene was found to react in the presence of titanium(IV) chloride at room temperature to give an isomeric mixture of 1,2-dimethyl-7,8,9,10-tetrachloro-1,2,6,10b-tetrahydro-6,10b-o-benzenoaceanthrylenes. The structure of the latter was confirmed by independent syntheses. In contrast, the ap conformer of the former did not give any sign of the reaction under the same conditions but reacted when antimony(V) chloride was added to give the same mixture. Careful examination of the reaction mixture suggests that the starting material was rapidly converted to (E)-1,2,3,4-tetrachloro-9-(1-methyl-1-propenyl)triptycene and cyclization followed. Action of silver nitrate on ±sc-9-(2-bromo-1,1-dimethylethyl)-1,2,3,4-tetrachlorotriptycene afforded a mixture of the stereoisomers of the olefin while the ap form remained intact.
Reactivities of Stable Rotamers. IX. Ionizing Reactions of 9-(2-Bromomethyl-6-methylphenyl)fluorene Rotamers
Authors: Murata Shigeru , Kanno Seiichiro , Tanabe Yo , Nakamura Mikio , Oki Michinori 
Published: July 2006

Abstract
Ionizing reactions of ap-9-(2-bromomethyl-6-methylphenyl)fluorene in ionizing solvents afforded 12-methyl-8,12b-dihydrobenz[a]aceanthrylene and its dehydrogenated compound, whereas the sp isomer remained intact. Forced ionization of the sp isomer with silver salts afforded products originated from the corresponding cation and either the anion of the salt or the solvent, whereas the ap isomer gave cyclized product under the same conditions, if the nucleophilicity of the solvent was poor. The reaction of the sp isomer was faster than the ap in nucleophilic solvents, whereas the reverse was true for poorly nucleophilic solvents. Solvolysis of the rotamers in formic acid yielded the corresponding formates, the sp isomer reacting faster than the ap. The results are discussed on the basis that the solvation shell in the ap form is completed by the participation of the fluorene ring whereas in the sp form the shell is completed by the solvent molecules.
Oxidation of Lipids. I. Quantitative Determination of the Oxidation of Methyl Linoleate and Methyl Linolenate
Authors: Yamamoto Yorihiro , Niki Etsuo , Kamiya Yoshio 
Published: July 2006

Abstract
The extent of oxidation of methyl linoleate and methyl linolenate has been measured quantitatively by several methods such as oxygen uptake, substrate disappearance, and formation of conjugated diene, TBA-reactive material and of hydrocarbon gas. In the early stage of oxidation of methyl linoleate, oxygen uptake, substrate disappearance, peroxide and conjugated diene formation were all quantitative and their results agreed well each other. Little TBA-reactive material and hydrocarbons were observed. In the oxidation of methyl linolenate, however, no product was formed quantitatively, and the extent of oxidation estimated decreased in the order, oxygen uptake&gt;substrate disappearance&gt;peroxide&gt;conjugated diene&gt;TBA-reactive material.
The Solvent Extration of Amino Acids with Crown Ether
Authors: Noguchi Hideyuki , Nakamura Hiroyoshi , Nagamatsu Masatoshi , Yoshio Masaki 
Published: July 2006

Abstract
Protonated amino acids were extracted with crown ether and Metanil Yellow anion into 1,2-dichloroethane. The overall extraction constants (Kex) for the 1:1:1 complex, AHLIn, of 18-crown-6 (L) with protonated amino acid (AH+), and the Metanil Yellow anion (In−) between 1,2-dichloroethane and water have been determined at 25.0 °C. The values of the extraction constants (logKex) were found to be 5.2, 6.2, 6.4, 6.3, 5.5, 6.2, and 5.5 for l-α-alanine, l-valine, l-leucine, l-phenylalanine, β-alanine, l-lysine, and aspartic acid respectively at 25.0 °C. The dependence of the varieties of crown ether on the extractability of l-leucine has been investigated. The highest extractability was obtained when water-soluble crown ether was used.
Optical Resolution of 2-Amino-1,2-diphenylethanol by Preferential Crystallization and Its Utilization in Fractional Crystallization and Enantioselective Reduction of Prochiral Ketones
Authors: Saigo Kazuhiko , Ogawa Shigeo , Kikuchi Shigetoshi , Kasahara Atsushi , Nohira Hiroyuki 
Published: July 2006

Abstract
(±)-erythro-2-Amino-1,2-diphenylethanol prepared from benzoin oxime by catalytic reduction was successfully resolved into a pair of optically active forms by preferential crystallization. The optically active amino alcohol was found to be useful as a basic resolving agent for the optical resolution of tartaric acid, trans-2,3-oxiranedicarboxylic acid, 2-hydroxy-2-phenylpropionic acid, and 3-endo-benzamido-5-norbornene-2-endo-carboxylic acid. Chiral hydrides prepared from lithium aluminium hydride and optically active threo- or erythro-2-amino-1,2-diphenylethanol derivatives were applied to the enantioface differentiating reduction of prochiral ketones to give the corresponding optically active alcohols in 26–72% optical purities.
Synthetic Approach toward Antibiotic Tunicamycins. 3. Methyl 3,4,7,8-Tetra-O-acetyl-10-O-benzyl-2-benzyloxycarbonylamino-2,6-dideoxy-11,12-O-isopropylidene-β-l-dodecodialdo-(12R)-furanose-(12,9)-pyranosides-(1,5)
Authors: Fukuda Yoshimasa , Sasai Hiroaki , Suami Tetsuo 
Published: July 2006

Abstract
Higher carbon carbohydrates, dodecose derivatives have been synthesized by the base-catalyzed addition of nitro sugar to sugar aldehyde. The addition reaction of methyl 2-benzyloxycarbonylamino-2,6,7-trideoxy-3,4-O-isopropylidene-7-nitro-α-d-galacto-heptopyranoside to 3-O-benzyl-1,2-O-isopropylidene-α-d-ribodialdofuranose-(1,4) yielded nitro-dodecose derivatives. The nitro-dodecose derivatives were then converted into the corresponding hydroxy and acetoxy derivatives.
The Crystal Structure of o-Fluorobenzamide
Authors: Kato Yoshihiro , Sakurai Kiichi 
Published: July 2006

Abstract
The crystal of the title compound is monoclinic, with space group P21/a, a=12.695, b=20.534, c=5.133 Å, β=97.80°, Z=8. The molecules are connected by one pair of hydrogen bonds to form asymmetric dimers and these dimers are further linked by two kinds of hydrogen bonds into endless chains along the c axis.
Anomalous Crystallization Behavior in the Glass Forming Composition Region of the H2O–HNO3 System
Authors: Satoh Kenji , Kanno Hitoshi 
Published: July 2006

Abstract
Glass formation composition region of aqueous HNO3 solution is determined. Anomalous crystallization behavior was observed for the solution having the composition near HNO3·3H2O. From Tg data, Tg for a bulk glassy water is estimated to be −144±2 °C.
The Effect of Ultraviolet Radiation on Wettability of Polymer Surfaces
Authors: Esumi Kunio , Meguro Kenjiro , Schwartz A M , Zettlemoyer A C 
Published: July 2006

Abstract
The wettability of polystyrene and poly(methyl vinyl ketone) surface can be markedly changed by ultraviolet irradiation in air. The contact angle of water on both polymers decreases dramatically as a function of exposure time. This effect is mainly due to increase in the polar component of surface energy. The wettability of irradiated polymers goes back to near original values due to soluble photooxidation products into water after the water extraction.
A Mild Silver Salt-induced Oxidation of Dibromo-5-hydroxytropolones to Dibromo-p-tropoquinones
Authors: Takeshita Hitoshi , Kusaba Tomoyuki , Mori Akira 
Published: July 2006

Abstract
The treatment of 3,6-dibromo-, 3,7-dibromo, 4,6-dibromo-, and unsubstituted 5-hydroxytropolones with silver acetate in acetone gave the corresponding p-tropoquinones in good yields. When this reaction was carried out in protic solvents, some of these tropoquinones underwent further attack by solvent nucleophiles to give Michael-adducts or ring-contracted cyclohexadienones.
A Facile One-pot Synthesis of N-Substituted Phthalimides Using a Catalytic Amount of Crown Ether
Authors: Soai Kenso , Ookawa Atsuhiro , Kato Kyoko 
Published: July 2006

Abstract
N-Substituted phthalimides, intermediates of the Gabriel synthesis, were obtained in high yields (84–100%) by the addition of a catalytic amount of 18-crown-6 to the reaction of potassium phthalimide and alkyl halides in toluene.
Atropisomerism in Metal Chelates. The Crystal Structure and Absolute Configuration of (−)589-3-(2,4-Dinitro-1-naphthyl)-2,4-pentanedionato[tris(2-aminoethyl)amine]cobalt(III) Dibromide
Authors: Nakano Yoshiharu , Sato Shoichi 
Published: July 2006

Abstract
The crystal structure and the absolute configuration of (−)589-3-(2,4-dinitro-1-naphthyl)-2,4-pentanedionato[tris(2-aminoethyl)amine]cobalt(III) dibromide were determined by X-ray diffraction. The complex crystallizes as the orthorhombic space group P212121, with a=13.738(2), b=15.446(1), c=12.243(1) Å, and Z=4. The structure was solved by the Patterson-Fourier method and refined to a final R1 value of 0.038 for the 3347 observed reflections with |Fo|&gt;3σ(|Fo|). The acetylacetonate (acac) ring adopts a more deformed boat conformation than that in 3-(6-methyl-2,4-dinitrophenyl)-2,4-pentanedionato analogue. The three chelate rings of tris(2-aminoethyl)amine (tren) have envelope conformations and adopt λ, λ, and δ conformations. The absolute configuration of the title compound can be designated as R.
Photoelectrochemical Studies of MoS2 Electrode by Rotating Ring-disk Electrode Technique
Authors: Fujishima Akira , Noguchi Yoshikazu , Honda Kenichi , Loo Boon H 
Published: July 2006

Abstract
Photoelectrochemical processes at both n- and p-type MoS2 electrodes were studied by rotating ring-disk electrode technique. In comparison with other semiconductor photoelectrodes such as CdS, ZnO, and TiO2, the competitive oxidations of various reducing agents at n-MoS2 electrode were not clearly dependent on their redox potentials. The MoS2 photoanode was particularly stabilized in I− solutions, and this was attributed to the specific adsorption of I− ions on the electrode surface. Two step waves were observed in the photocurrent-potential curves of MoS2 photoanode in I− solutions. The first wave was controlled by the diffusion of I− ions from the bulk solution to the electrode surface, and the second wave at more anodic potential was dependent on the formation of the photogenerated holes.
Conformational Analysis of Stilbenes by Photoelectron Spectroscopy
Authors: Kobayashi Tsunetoshi , Suzuki Hiroshi , Ogawa Keiichiro 
Published: July 2006

Abstract
Conformations of (Z)-stilbene, (E)-stilbene, and various methyl-substituted (E)-stilbenes were discussed from the standpoint of photoelectron spectroscopy. Photoelectron spectral data of (Z)-stilbene and (E)-stilbene were found to be perfectly consistent with the results by the gas electron diffraction method concerning the twist angles of the phenyl groups. The twist angles of the phenyl groups in various methyl-substituted (E)-stilbenes were estimated using the photoelectron spectral data by the new method presented recently. These estimated values correspond well to those obtained from the standpoint absorption spectra.