bluuebunny/crossref_metadata_2025_split huggingface dataset:
Selective α-Monoalkylation of Phenylacetonitrile Using Alkali Metal Hydroxide Impregnated on Alumina
Authors: Sukata Kazuaki 
Published: July 2006

Abstract
In the alkylation of phenylacetonitrile with alkyl halides, alkali metal hydroxides impregnated on alumina act as efficient bases for selective α-monoalkylation in benzene. It is proposed that the reaction may take place exclusively in the pore. The selectivity for α-monoalkylation is explained in terms of steric hindrance.
Zeta Potentials of Metal Oxide Surfaces Modified with Silane Coupling Agents
Authors: Esumi Kunio , Meguro Kenjiro 
Published: July 2006

Abstract
The zeta potentials of metal oxide surfaces modified with silane coupling agents were measured as a function of pH in the suspensions. The methylations of the samples by methyltrimethoxysilane showed lower zeta potential values than those of the samples untreated. On the other hand, the treatment of the samples by two different amino silanes rendered the surfaces more cationic. The stability of the deposited silane layers was low; such a layer was easily removed from alumina and anatase-type titanium dioxide.
Studies on the β-Turn of Peptides. VII. Syntheses and Antibiotic Activities of Gramicidin S Analogs with l-Pro-l-Asn or l-Pro-d-Ala Sequence at the β-Turn Part
Authors: Sato Kazuki , Nagai Ukon 
Published: July 2006

Abstract
Two analogs of gramicidin S (GS), [l-Pro4,4′, l-Asn5,5′]-GS (10a) and [l-Pro4,4′, d-Ala5,5′]-GS were synthesized to investigate the possibility of replacing the β-turn part of GS by a different type of β-turn keeping the biological activity. For the synthesis of 10a, three procedures were examined and satisfactory results were obtained by the active ester method applied to cyclization of linear decapeptide with l-Pro at the C-terminus. Neither analog showed antibiotic activity indicating that the β-turn part of GS could not be replaced with l-Pro-l-Asn or l-Pro-d-Ala sequences without affecting on its activity. The CD and ORD spectra of the analogs and their 2,4-dinitrophenyl derivatives showed weaker Cotton effects than those of GS and its derivative, respectively. So, the analogs were considered not to take GS-like β-sheet conformation. The reason why the analogs did not take such conformations was investigated by the model tetrapeptides with chromophoric substituents.
Fluorescence as a Means for Kinetic Studies. II. Preparation and Reactions of Bifunctional Fluorescent Reagents as Kinetic Probes
Authors: Okamoto Akio , Toyoshima Kumiko , Mita Itaru 
Published: July 2006

Abstract
1,5-Naphthalenedisulfonyl dichloride was found to be useful as a bifunctional fluorescent probe for kinetic studies. Its reaction with butylamine in chloroform proceeds stepwise. The first reaction produces a nonfluorescent monosulfonamide and the second slow process forms a fluorescent disulfamide. Their rate constants were obtained. Another bifonunctional fluorescent probe was also examined briefly.
The Platinum Complex Catalyzed Reductive N-Carbonylation of Nitroarenes to the Carbamates
Authors: Watanabe Yoshihisa , Tsuji Yasushi , Takeuchi Ryo , Suzuki Naoki 
Published: July 2006

Abstract
The platium catalyst combined with triphenylphosphine, tin(IV) chloride, and triethylamine showed high activity for the reductive N-carbonylation of nitroarene in ethanol at 180 °C under carbon monoxide of 60 kg cm−2. From nitrobenzene, ethyl phenylcarbamate was obtained in 83% yield. Iron(III) chloride, aluminum chloride and titanium(IV) chloride could be used as Lewis acids in place of tin(IV) chloride. Various nitroarenes were transformed into corresponding carbamate in moderate to excellent yields with the platinum catalyst.
Mechanism of Quenching of SO2 \~{C}(1B2) by He, Ar, and N2
Authors: Oka Takefumi 
Published: July 2006

Abstract
Sulfur dioxide gas was excited to \~{C}(1B2) state by steady illumination and the total intensity and the spectrum of the fluorescence were measured in the SO2 pressure range of 0.1–1 Torr (1 Torr≈133.322 Pa) both in the absence and in the presence of He, Ar, and N2 up to 600 Torr. The observed fluorescence spectrum was broad but the wavelength of the maximum intensity was found to be dependent upon excitation wavelength in the range of 240–220 nm. Addition of foreign gases caused the blue shift of the fluorescence spectrum. The Stern-Volmer plots were nonlinear for quenching by the foreign gases but linear for self-quenching. It was suggested that the foreign gas molecules cause not only vibrational deactivation but also collision induced transition between 1B2 state and a nonemitting state and that the rate constants of the transition to the nonemitting state are larger from higher vibrational levels than from lower ones.
Structure of Liquid N,N-Dimethylformamide Studied by Means of X-Ray Diffraction
Authors: Ohtaki Hitoshi , Itoh Sumiko , Yamaguchi Toshio , Ishiguro Shin-ichi , Rode B M 
Published: July 2006

Abstract
The structure of N,N-dimethylformamide (DMF) was determined at 25 °C by means of X-ray diffraction using a θ-θ type X-ray diffractometer. The least-squares analysis of the reduced intensities results that a DMF molecule has a practically planar skeletal structure in the liquid state. Intramolecular structural parameters within a DMF molecule were determined as follows: C=O; 1.24 Å, N–C(CHO); 1.35 Å, and N–C(CH3); 1.45 Å. The bond lengths are not appreciably different from those found in the gas phase, except for the C=O length, which is slightly longer by 0.04 Å in the liquid state than in the gaseous one. The radial distribution curve of DMF shows that the intermolecular arrangement of DMF molecules is practically fully disordered and no evidence has been found for the cluster formation of DMF molecules in the liquid state. The experimental result for the weak intermolecular interactions between DMF molecules is supported by ab initio MO-SCF calculations.
Microwave Spectroscopy of Boron Chloride (BCl). The Chlorine Nuclear Quadrupole Coupling Constant
Authors: Endo Yasuki , Saito Shuji , Hirota Eizi 
Published: July 2006

Abstract
The pure rotational spectrum of an unstable diatomic molecule, boron chloride (BCl), has been observed in the millimeter wave region. The BCl molecule was directly generated in a 3.7-m long free space absorp-tion cell by a d.c. glow discharge in BCl3. Rotational transitions of 11B35Cl and 11B37Cl in the ground vibrational state, which are split into a few components by the nuclear electric quadrupole interactions, have been observed and analyzed to yield molecular constants including the chlorine nuclear quadrupole coupling constant with high accuracy. The eQq constant thus determined is discussed along with those of other diatomic chlorides, to obtain information on the electronic structure of the molecules.
The Syntheses and Decompositions of Strontium and Barium Tetraphosphates
Authors: Watanabe Makoto , Maeda Mioko , Yamada Tamotsu 
Published: July 2006

Abstract
Strontium and barium tetraphosphates were made by hydrolyzing cyclo-tetraphosphate in a 5 mol dm−3 solution of sodium hydroxide, neutralizing the phosphate solution with 1 mol dm−3 hydrochloric acid, and then adding an aqueous solution of strontium or barium chloride to the solution. The P/M (M: Sr or Ba) ratio of the tetraphosphates was 1.3. The strontium and barium tetraphosphates were X-ray diffractometrically amorphous and contained about 23–14 and 14–8% of bound water depending on the washing conditions. They decomposed to phosphates having shorter chain lengths with the bond water in air at 25–30 °C or at a higher temperature. The decomposed phosphates were polymerized again above 150 °C and the products were mixtures of diphosphate and other polyphosphates.
Preparation and Spectroscopic Characterization of Substituted Pentacyanoferrates(II) with Phosphine or Phosphite Ligands
Authors: Inoue Hidenari , Sasagawa Masahiro , Fluck Ekkehard , Shirai Tsuneo 
Published: July 2006

Abstract
Twenty-two substituted pentacyanoferrates(II) with the formula Na3[Fe(CN)5PX3]·2H2O (PX3=phosphine or phosphite) have been prepared by ligand substitution of sodium amminepentacyanoferrate(II). The phosphite complexes show smaller isomer shifts than the phosphine complexes. The phosphine complexes involving an aryl or bulky phosphine exhibit larger quadrupole splitting than the phosphite complexes. These tendencies in M\ddotossbauer parameters are discussed in terms of the π-acceptor capability of the phosphine and phosphite ligands. The linear dependence of the isomer shifts on both CN stretching frequencies and d-d transition energies is interpreted on the basis of the predominance of iron-to-phosphorus π back-donation.
A Complete Series of [Co(acac)x(en)y(dmpe)z] Complexes
Authors: Ohishi Tomoji , Kashiwabara Kazuo , Fujita Junnosuke 
Published: July 2006

Abstract
A complete series of [Co(acac)x(en)y(dmpe)z] complexes was obtained by preparing four new complexes, [Co(acac)(dmpe)2]2+, [Co(en)2(dmpe)]3+, [Co(en)(dmpe)2]3+, and [Co(acac)(en)(dmpe)]2+, where acac, en, and dmpe denote an acetylacetonate ion, ethylenediamine, and 1,2-bis(dimethylphosphino)ethane, respectively. Except for [Co(acac)(dmpe)2]2+, the three new complexes were resolved into optical isomers by SP-Sephadex column chromatography. Absorption and circular dichroism spectra of all the complexes were recorded and compared with one another.
The Synthesis of (+)-Coleon A
Authors: Matsumoto Takashi , Imai Sachihiko , Hirata Takashi , Fukuda Yutaka , Yamaguchi Tadashi , Inoue Kazuhiro 
Published: July 2006

Abstract
Partial methylation of (R)-6-hydroxy-3-(3-hydroxypropyl)-7-isopropyl-3,4-dimethylnaphtho[2,3-b]furan-2(3H)-one followed by benzylation afforded the 6-benzyloxy-3-(3-methoxypropyl) derivative, which was converted into the 9-acetyl derivative by the series of reactions; sodium borohydride reduction, acetylation, alkaline hydrolysis, and Jones oxidation. This was oxidized with m-chloroperbenzoic acid to give the 9-acetoxy-5,8-quinone derivative, which was further converted into the 5,6,8,9-tetraacetoxy-3-(3-hydroxypropyl) derivative by hydrogenolysis, reductive acetylation, and demethylation. The tetraacetate in pyridine was treated with o-nitrophenyl selenocyanate in the presence of tributylphosphine and the resulting selenide was oxidized with hydrogen peroxide to give the 3-allyl derivative. This was converted into (+)-coleon A lactone by alkaline hydrolysis and subsequent oxidation. Finally, (+)-coleon A lactone was reduced with sodium borohydride to give (+)-coleon A which was also obtained by lithium aluminium hydride reduction of the 3-allyl derivative.
Cyclic Phosphorylation Reaction of Diols with Tri(1-imidazolyl)phosphine
Authors: Shimidzu Takeo , Yamana Kazushige , Kanda Naoya , Kitagawa Susumu 
Published: July 2006

Abstract
Tri(1-imidazolyl)phosphine (1) gave the cyclic phosphite quantitatively in the reactions with the diols possessing favorably placed hydroxyl groups in which the distance between the two oxygen atoms is 2.7–3.0 Å. The both five- and six-membered cyclic phosphites were obtained quantitatively from the reactions of the diols possessing flexible chains with 1. The course of the selective formation of ribonucleoside 2′,3′-cyclic 1-imidazolylphosphonite was interpretated by the higher reactivity of 1 toward the 2′- or 3′-hydroxyl group than toward the 5′-hydroxyl group of ribonucleoside.
The Vibrational Spectra and Thermodynamic Functions of 2,3-Dichloropyridine
Authors: Medhi Kanak Chandra 
Published: July 2006

Abstract
The infrared spectrum in the vapor, liquid, solution, and solid phases and the laser Raman spectrum in the liquid state have been measured for 2,3-dichloropyridine. A complete vibrational assignment is given. Ideal gas state thermodynamic functions of the molecule are computed over the temperature range 200–1500 K.
The Wavelength Dependence of the Photochemical Reaction of 9-Anthracenecarbaldehyde with 2-Methyl-2-butene
Authors: Tanaka Fujio , Yamashita Shigeru 
Published: July 2006

Abstract
Photochemical reaction of 9-anthracenecarbaldehyde with 2-methyl-2-butene was studied under irradiation of &gt;410 and 366 nm. Oxetane formation is predominant in both the wavelength cases, as revealed through isolation of reaction products and examination of their NMR, mass, and UV spectra.
Chirality of Waugh-type Enneamolybdomanganate(IV) Heteropolyanion. Observation of a Pfeiffer Effect
Authors: Nomiya Kenji , Kobayashi Ryoichi , Miwa Makoto 
Published: July 2006

Abstract
Enneamolybdomanganate(IV), [MnIV-Mo9O32]6−, so-called Waugh-type heteropolyanion, has a chirality based on the D3 symmetry around an MnO6 octahedron. Attempts to resolve the racemic polyanion have been unsuccessful. A Pfeiffer effect was observed for the tetrabutylammonium salt in organic media containing l-brucine sulfate as an environment substance. This is the third example of heteropolyanions which show an optical activity.
The Reactivity of Radical Anions Generated by Electron-transfer Reaction of Allyl Acetates
Authors: Tsujimoto Kazuo , Kamiyama Yojiro , Furukawa Yuji , Ohashi Mamoru 
Published: July 2006

Abstract
Photoinduced electron-transfer reactions of 3-(2-naphthyl)-2-butenyl acetate gave the reduced products, while the electrochemical and Birch reduction of the acetate furnished (E)-2-(2-naphthyl)-2-butene as the sole product. One-electron reduction was suggested by mechanistic studies of the photoreaction on the basis of deuterium incorporation into the products. A similar mechanism can operate in the photoreduction of cinnamyl acetate.
The Crystal and Molecular Structure of trans(O)·mer(N)-(S-(2-Aminoethyl)-l-homocysteinato)(glycinato)cobalt(III) Perchlorate
Authors: Okamoto Ken-ichi , Suzuki Masutaro , Einaga Hisahiko , Hidaka Jinsai 
Published: July 2006

Abstract
The crystal and molecular structure of the title complex, trans(O)·mer(N)-[Co(l-aehc)(gly)]+, has been determined by the X-ray analysis. This isomer has Δ configuration. The sulfur donor atom of the coordinated l-aehc has R configuration and the six-membered N–S chelate ring takes a chair conformation.
Reaction of Bis(2-methyl-8-quinolinolato)cobalt(II) with Nitrogen Monoxide
Authors: Miki Eiichi , Saito Katsunori , Mizumachi Kunihiko , Ishimori Tatsujiro 
Published: July 2006

Abstract
[Co(C10H8NO)2]·H2O (C10H8NO−=2-methyl-8-quinolinolate ion) reacted with nitrogen monoxide in dichloromethane to give unstable compounds, [Co(C10H8NO)2(NO)2] and [NO]3[Co(C10H8NO)2(NO3)(NO2)] with liberation of dinitrogen oxide. The compounds were characterized by 15N-isotopic effect observed on the IR spectra.
A Photochemically Induced Novel Ring Enlargement Reaction. Reaction of Cation Radical Derived from 7,8-Bis(methoxycarbonyl)-9-(4-methoxyphenyl)-1-phenyl-3,4-benzo-9-azabicyclo[4.2.1]non-3-ene-2,5-dione
Authors: Maruyama Kazuhiro , Ogawa Takuji 
Published: July 2006

Abstract
By oxidation with molecular oxygen, photoadducts 2 of 1-(4-methoxyphenyl)-1a-phenyl-1a,7a-dihydro-1H-naphth[2,3-b]azirine-2,7-dione with olefins afforded cation radicals of 2 in acidic media such as CF3CO2H or HClO4. On irradiation, the cation radicals gave ring enlarged isomers 10,11-bis(methoxycarbonyl)-1-phenyl-3,4-benzo-7,8-(3′-methoxybenzo)-9-azabicyclo[4.3.2] undec-3,7-diene-2,5-dione (3).
Molecular Structure of 3,4,6-Tri-O-acetyl-1,2-O-[(1S)-1-(2-p-bromophenyl)-9H-imidazo[1,2-a]benzimidazol-3-yl]ethylidene]-α-d-glucopyranose Acetone Solvate
Authors: Takayanagi Hiroaki , Ogura Haruo , Tsuzuno Nobuyasu , Kubota Isao , Iitaka Yoichi 
Published: July 2006

Abstract
The structure of a product from a reaction mixture of 2-(p-bromophenyl)-9H-imidazo[1,2-a]benzimidazole and 2,3,4,6-tetra-O-acetyl-β-d-glucopyranosyl bromide in the presence of NaI, hexamethyldisilazane, and (NH4)2SO4 has been established as 3,4,6-tri-O-acetyl-1,2-O-[(1S)-1-[2-p-bromophenyl)-9H-imidazo[1,2-a]benzimidazol-3-yl]ethylidene]-α-d-glucopyranose by means of X-ray crystal structure analysis.
Convenient Preparation of Methylthiomethyl p-Tolyl Sulfone Starting from Dimethyl Sulfoxide
Authors: Ogura Katsuyuki , Yahata Nobuhiro , Watanabe Jun-ichi , Takahashi Kazumasa , Iida Hirotada 
Published: July 2006

Abstract
An efficient method for preparing methylthiomethyl p-tolyl sulfone was accomplished by the Pummerer reaction of dimethyl sulfoxide with acetic anhydride followed by treatment of the resulting acetoxymethyl methyl sulfide with sodium p-toluenesulfinate in the presence of sodium acetate in acetic acid.
A 1H and 31P NMR Study of Phenylphosphonous Dichloride Partially Oriented in a Nematic Phase
Authors: Saito Koji , Yoshino Akihiro , Yoshida Tadayoshi , Takahashi Kensuke 
Published: July 2006

Abstract
The 1H and 31P NMR spectra of phenylphosphonous dichloride dissolved in a nematic phase of N-(p-ethoxybenzylidene)-p-butylaniline (EBBA) have been analyzed, and the structure of the proton and phosphorus skeleton has been determined.
An X-Ray Diffraction Study on the Structures of Mono(glycinato)nickel(II) and Tris(glycinato)nickelate(II) Complexes in Aqueous Solution
Authors: Ozutsumi Kazuhiko , Ohtaki Hitoshi 
Published: July 2006

Abstract
The structures of mono(glycinato)nickel(II) and tris(glycinato)nickelate(II) complexes in aqueous solution were determined by the X-ray diffraction method. From the analysis of the radial distribution curve of solution A, in which the hexaaqua- and mono(glycinato)nickel(II) ions coexisted (the mole ratio Cgly/CNi=0.792, where Ci denotes the total concentration of species i), we found that the mono(glycinato)nickel(II) complex combined with four water molecules at the distance of (2.08±0.01) Å, the bond being longer than the Ni–OH2 bond (2.04 Å) within the [Ni(OH2)6]2+ ion. The Ni–O and Ni–N bond lengths within the mono(glycinato)nickel(II) complex were essentially the same and (2.09±0.02) Å. Therefore, the mono(glycinato)nickel(II) ion has a practically regular octahedral structure. The nonbonding Ni···C distance was also determined to be (2.87±0.02) Å. The X-ray scattering data of solutions having the Cgly/CNi mole ratio of 3.24 (solution B) and 3.94 (solution C), in both of which almost all nickel(II) ions formed the [Ni(gly)3]− complex, showed that the tris(glycinato)nickelate(II) complex had a slightly distorted octahedral structure with the Ni–O and Ni–N bond lengths of (2.03±？.01) Å and (2.14±？.01) Å, respectively. The nonbonding Ni···C(COO), Ni···C(CH2) and Ni···O(O=C) distances were (2.82±？.02) Å, (2.96±？.02) Å, and (4.07±？.03) Å, respectively.
Oxidized Rubredoxin Models. II. Iron(III) Complexes of Z-Cys-Pro-Leu-Cys-OMe and Z-Cys-Thr-Val-Cys-OMe
Authors: Nakata Michio , Ueyama Norikazu , Terakawa Toshitsugu , Nakamura Akira 
Published: July 2006

Abstract
Fe(III) complexes of cysteine-containing peptides such as Z–Cys–Pro–Leu–Cys–OMe and Z–Cys–Thr–Val–Cys–OMe corresponding to the Fe binding amino acid sequences in Cl. pasteurianum rubredoxin were prepared in solution and characterized by the absorption, circular dichroism (CD), and magnetic circular dichroism (MCD) spectra and were compared with those of the Fe(III) complexes of Z–Cys–Ala–Ala–Cys–OMe, Z–Ala–Cys–OMe, and Z–Cys–Ala–Cys–OMe. These model compelxes exhibited the existence of an electronic configuration and a core structure similar to that of native rubredoxin. The thermal stabilities of the Fe(III) pep tide complexes decrease in the following order, Z–Cys–Thr–Val–Cys–OMe&gt;Z–Cys–Ala–Ala–Cys–OMe&gt;Z–Cys–Pro–Leu–Cys–OMe\simeqZ–Ala–Cys–OMe&gt;&gt;Z–Cys–Ala–Cys–OMe.
Asymmetric Synthesis of α-Deuterated α-Amino Acids through Nonenzymatic Transamination Reaction and the Determination of Their Enantiomeric Excesses
Authors: Tachibana Yoji , Ando Makoto , Kuzuhara Hiroyoshi 
Published: July 2006

Abstract
Optically active α-deuterated α-amino acids were prepared in methano-d through Zn2+-catalyzed transamination reaction between the chiral pyridoxamine analogs, (R)- or (S)-15-aminomethyl-14-hydroxy-5,5-dimethyl-2,8-dithia[9] (2,5)pyridinophane and various α-keto acids with enantiomeric excesses ranging from 40 to 94%. Aliphatic α-keto acids gave α-deuterated α-amino acids, whereas aromatic ones possessing a methylene group between the carbonyl group (ketone) and the aromatic ring underwent concomitant deuterium substitution at the active methylene group to give the amino acids deuterated at both α- and β-positions of the carboxyl group. The use of the (S)-pyridoxamine analog gave the (R)-deuterated α-amino acids in excess and vice versa. The enatiomeric excesses of the amino acids were determined through the analyses of 1H NMR spectra of the Schiff bases produced by the condensation of the amino acids with the chiral pyridoxal analog, (R)- or (S)-15-formyl-14-hydroxy-2,8-dithia[9](2, 5)pyridinophane. The azomethine protons of the diastereomeric Schiff bases were clearly resolved in the spectrum and their intensities well reflected the amount of the diastereomers.
Photochemical Reactions of 2-(Dimethylcarbamoyl)quinolines
Authors: Ono Isao , Hata Norisuke 
Published: July 2006

Abstract
2-(Dimethylcarbamoyl)quinolines are converted into 2-(methylaminoacetyl)quinolines (2) and 2-methyl-1H-pyrrolo[3,4-b]quinolin-3(2H)-ones (3) by irradiation in a nitrogen atmosphere. The reaction was quite efficient in acetonitrile but inefficient in hydrocarbon solvents and ethanol. The introduction of a chlorine atom to the 4-position of a quinoline nucleus caused an increase of the yield of 3 in company with a decrease of the yield of 2. On the other hand, irradiation in an oxygen atmosphere afforded 2-(methylcarbamoyl)quinolines as a main product but 2 and 3 were minor products. The results of quenching and sensitization experiments confirmed that the triplet π,π* state was responsible for the formation of those products. It is suggested that the reaction involves zwitterionic intermediates formed via Type II hydrogen abstraction by the ring nitrogen from the N-methyl group.
Asymmetric Reduction with C1- and C2-Symmetric NADH Model Compounds Containing Chiral 1,1′-Binaphthyls
Authors: Amano Masaki , Watanabe Motoshi , Baba Naomichi , Oda Jun’ichi , Inouye Yuzo 
Published: July 2006

Abstract
The present study deals with Mg-catalyzed asymmetric reduction of ethyl benzoylformate by the use of C2-symmetric NADH model compounds in which axial dissymmetry (chiral 1, 1′-binaphthyl derivatives) was introduced as a chiral source for the first time and the results were compared with those obtained by the corresponding C1-symmetric models bearing the same chiral center. Better e.e.’s of the reduction product were obtained by the use of NADH models having C2-symmetry than does the corresponding C1 symmetric ones. Further, the kind of bonding as well as the distance between chiral binaphthyl and the reaction center affected the stereochemical course of hydrogen transfer.
The Base-catalyzed Condensation Reaction of Dimethyl Malonate with 5-Chloro-2-methoxytropone and 2,5-Dichlorotropone. On the Solvent Effect for the Sites of the Reaction
Authors: Nozoe Tetsuo , Takeshita Hitoshi , Tajiri Kozo 
Published: July 2006

Abstract
The sites of the nucleophilic attack of the base-catalyzed condensation of dimethyl malonate with 5-chloro-2-methoxytropone were solvent-dependent; the normal substitution product was predominant in benzene, but the ciné-substitution products were exclusive in methanol. With 2,5-dichlorotropone, the ciné-reaction products were exclusive in both solvents.
Vibrational Spectra of Organic Conductors. Charge Transfer Salts of TTF with Substituted p-Benzoquinones
Authors: Matsuzaki Susumu , Moriyama Toshiharu , Onomichi Mitsukazu , Toyoda Koichi 
Published: July 2006

Abstract
Charge transfer salts of tetrathiafulvalen (TTF) with five substituted p-benzoquinones (fluoranil, chloranil, bromanil, iodanil, and 2,3-dichloro-5,6-dicyano-p-benzoquinone) were prepared by diffusion and cooling methods. IR, Raman, and electronic spectra of these salts measured at room temperature showed that all except fluoranil salt formed two crystal phases, i.e., the diffusion and the cooling methods gave a mixed-valent and a monovalent ionic phases respectively. The degrees of charge transfer (ρ) of the mixed-valent salts were estimated from the Raman frequencies of ag ν3 of TTF, and nearly equal values (ca. 0.7) were obtained for all of them.