bluuebunny/crossref_metadata_2025_split huggingface dataset:
Translational Energy Distribution and Relative Emission Cross Section of Excited Hydrogen Atom Produced in Electron-chloroform Collisions
Authors: Ogawa Teiichiro , Miyoshi Fumihiro , Higo Morihide 
Published: July 2006

Abstract
Dissociative excitation of CHCl3 and CDCl3 has been investigated by means of the controlled electron impact and the high resolution emission spectroscopy. The emission spectrum shows such excited species as H, CH, CH+, Cl+, CCl, and HCl+. The excitation function of H* has two thresholds, 20.5 and 41.0 eV. The emission cross spections of H* and D* reveal an isotope effect, which is dependent on the excitation energy and the principal quantum number. Translational energy distributions of H* and D* have been determined from the Doppler line shape of the Balmer-β line, and average translational energies from the half-width of the Balmer-α, β, γ, and δ lines. There are no noticeable isotope effect for the translational energy; their major peaks lie at 0–1, 4, and 6–12 eV. These findings indicate that there are at least three major processes for the formation of the excited hydrogen atom. They are assigned to dissociative excitation through the Rydberg states converging to the (2a1)1 ionic states and through excited Rydberg states.
A Co-59 Nuclear Magnetic Resonance Study of the Interaction of Lanthanoid Shift Reagents with Tris(β-diketonato)cobalt(III) Complexes
Authors: Hirayama Masatoshi , Kawamata Yoshimichi , Fujii Yuki , Nakano Yoshiharu 
Published: July 2006

Abstract
Ln(fod)3 (Ln=La, Pr, Nd, Sm, and Eu)-induced 59Co shifts (δCo) for a series of tris(β-diketonato)Co(III) complexes were determined directly from separate observations of the free complexes and 1 : 1 adducts with Ln(fod)3 at room temperature (25 °C) in CHCl3; Ln(dpm)3-induced shifts were also observed in CCl4. Values of δCo corrected for the adduct-formation shifts (δ′Co) are separated into contact and pseudo-contact contributions by using the intercept and slope in a linear plot of δ′Co⁄&lt;Sz&gt; vs. D⁄&lt;Sz&gt;. It is suggested from the estimated hfs constant of 59Co (≈−0.2 G, 10−4T) that the spin polarization mechanism may be predominant for the electron spin transfer from Ln ion into Co ion.
X-Ray Structures of (−)589-Bis(isothiocyanato)bis(1,3-propanediamine)chromium(III) Bis[μ-(+)-tartrato(4−)]bis[antimonate(III)] Dihydrate and Its Cobalt(III) Analogue
Authors: Matsumoto Keiji , Ooi Shun’ichiro , Kawaguchi Hiroshi , Nakano Mamoru , Kawaguchi Shinichi 
Published: July 2006

Abstract
The crystal structures of (−)589-[Cr(NCS)2(tn)2]1/2[Sb2(+)-tart2]·2H2O (1) and (−)589-[Co(NCS)2(tn)2]1/2-[Sb2(+)-tart2]·2H2O (2) have been determined from the X-ray diffraction data. The structures were solved by the Patterson-Fourier method and refined by the least-squares method to R=0.043 (1) and 0.070 (2) for 2659 and 1826 reflections respectively. The two crystals are isomorphous with each other. The complex cations in 1 and 2 have a similar geometry. Their absolute configuration is Λ, and agrees with that assigned from the CD spectra in comparison with those in the first d-d band region of bis(ethylenediamine)cobalt(III) complexes. The six-membered chelate rings are of chair conformation. The chairs are flattened more than expected from the conformational analysis.
Photochemical Electron Transport from Water Layer to Organic Layer via Sodium Anthraquinone-2-sulfonate by Stepwise Two Photon Excitation
Authors: Inoue Haruo , Hida Mitsuhiko 
Published: July 2006

Abstract
Photochemical electron transport from hydroxide ion to organic acceptor molecule via an anthraquinone derivative as an electron carrier was investigated in homogeneous, cationic micellar, and cationic reversed micellar systems. In homogeneous alkaline aqueous ethanol, the photochemically generated radical anion of sodium anthraquinone-2-sulfonate (1) was stable against further irradiation with visible light (λ&gt;450 nm), while the dianion of 1 was reversibly converted to the radical anion by visible light irradiation. The reversible conversion was accelerated by the addition of an organic acceptor molecule such as 1,4-dicyanobenzene. In a cationic hexa-decyltrimethylammonium micellar system, an effective photoreduction of 1 by an electron transfer from hydroxide ion concentrated on the micellar surface to the excited 1 located in the surface area of the micelle was observed. In a reversed micellar system an electron was effectively transported from the water layer to the organic layer; an electron was transfered from hydroxide ion in the water layer incorporated in a benzylhexadecyldimethylammonium reversed micelle to 1 at the micellar surface by irradiation with light of λ=365 nm. Successive visible light irradiation (λ&gt;450 nm) caused an electron ejection from the radical anion of 1 to benzonitrile as a bulk phase solvent. The possibility of the incorporation of carbon dioxide into the acceptor cycle of the electron transport system was also examined. In pyridine solution, carbon dioxide caused the disappearance of the reduced species of 1 on visible light irradiation (λ&gt;450 nm). Trace amounts of dihydropyridinedicarboxylic acid derivatives were obtained.
Thermochemical Hydrogen Production by the Magnesium-Sulfur-Iodine Cycle
Authors: Mizuta Susumu , Kumagai Toshiya 
Published: July 2006

Abstract
A new thermochemical cycle, consisting of (i) redox reaction of sulfur dioxide and iodine with magnesium oxide in aqueous phase, (ii) hydrolysis of magnesium iodide, (iii) thermal decomposition of magnesium sulfate, and (iv) thermal dissociation of hydrogen iodide, is presented for hydrogen production. The key reactions (i) and (ii) are experimentally verified.
Acylthiocyclopropenium Ions
Authors: Yoshida Hiroshi , Nakajima Mikito , Ogata Tsuyoshi , Matsumoto Kiyoshi 
Published: July 2006

Abstract
On treatment with a mixture of thiocarboxylic acid and perchloric acid in acetic anhydride, cyclopropenone gave acylthiocyclopropenium perchlorate in a good yield. Bis(acylthio)cyclopropene also yielded the salt under similar reaction conditions. The salt was stable under nitrogen at low temperatures, but was easily hydrolyzed to yield the corresponding cyclopropenethione.
Synthesis and Alkali-cation Complexing Properties of 12-Crown-4 Derivatives
Authors: Miyazaki Takeshi , Yanagida Shozo , Itoh Akira , Okahara Mitsuo 
Published: July 2006

Abstract
Benzyloxymethyl-12-crown-4, a precursor of hydroxymethyl-12-crown-4, is prepared in an excellent yield by the reaction of 3-benzyloxy-1,2-propanediol with 1,8-dichloro-3,6-dioxaoctane in the heterogeneous t-BuOLi/t-BuOH/LiBr·2H2O reaction system. The hydrogenolysis in the presence of p-toluenesulfonic acid leads to a good yield of hydroxymethyl-12-crown-4. The sandwich-type 2:1 complexation with Na+ of 12-crown-4 and hydroxymethyl-12-crown-4 derivatives was discussed on the basis of the stability constants and the solvent extraction in the CH2Cl2–water system.
Photoreduction of Silver Ion in a Titanium Dioxide Suspension
Authors: Hada Hiroshi , Yonezawa Yoshiro , Saikawa Masahiko 
Published: July 2006

Abstract
Quantum yields ranging from 0.084 to 0.191 were obtained for the reduction of Ag+ by irradiation of light at 365 nm on a TiO2 surface in aqueous solutions containing 1×10−4 to 1×10−2 mol dm−3 AgClO4. Some features of the reduction were preliminarily examined with the aid of an electrochemical measurement of TiO2 sinter. It is proposed that some conduction-band electrons, produced in the TiO2 by irradiation, transfer to Ag+ adsorbed on the TiO2 surface and that positive holes react with water molecules. The photoreduction of Ag+ is optically sensitized by addition of Uranine. The apparent quantum yield (the number of reacted ions/the number of photons incident to the suspension) of the dye-sensitized photoreduction of Ag+ is 0.01.
Fourier Transform Infrared Photoacoustic Spectroscopy of Polymers
Authors: Teramae Norio , Hiroguchi Masayuki , Tanaka Shigeyuki 
Published: July 2006

Abstract
Fourier transform infrared photoacoustic spectroscopy (FTIR-PAS) was applied to the structural elucidation of several kinds of organic polymers. By using a photoacoustic detection, infrared spectra of textile fabrics and rubbers containing carbon black could be measured without destructive and troublesome sample preparations. Curing process of resol type phenolic resins was examined by FTIR-PAS and conventional KBr disk method. FTIR-PAS was found to be sensitive to the structural change of the surface of the cured resins. Helmholtz resonance effect of the photoacoustic cell and the effect of the thermal properties of samples in FTIR-PAS were also discussed.
The Crystal Structure of Na2H2[Co4I3O18(OH2)6][Co4I3O16(OH)2(OH2)6]·22H2O
Authors: Kondo Hidetaka , Kobayashi Akiko , Sasaki Yukiyoshi 
Published: July 2006

Abstract
The title compound has the analytical formula of Co4H36I3NaO35 and is seemingly well formulated as NaH2[Co4I3O18(OH2)6]·11H2O. But the structure determination revealed that the crystals contain non-protonated [Co4I3O18(OH2)6]3− and doubly protonated [Co4I3O16(OH)2(OH2)6]−. The anion itself has a new variation of the Anderson structure. The almost identical three pK’s of the acid, H3[Co4I3O18(OH2)6], explain the formation of the present crystals by co-precipitation of two forms of the anion with different degrees of protonation. Crystals are monoclinic, space group P2/c, with a=15.172(2), b=10.874(1), c=19.436(3) Å, β=116.58(1)°, U=2867.6(5) Å3, and Z=2. The final R factor was 0.036 for 7010 independent reflections.
Dehydrooligopeptides. III. Synthesis of (Z,Z)- and (Z,E)-Geometric Isomers of Dehydrodipeptides and Their Base-catalyzed Transformation to the Hydantoin Derivatives
Authors: Shin Chung-gi , Yonezawa Yasuchika , Yamada Toyofumi , Yoshimura Juji 
Published: July 2006

Abstract
N-Benzyloxycarbonyl (Cbz)-(Z,E)-dehydrodipeptides, comprised of both (Z)- and (E)-α-dehydroamino acid residues, were first synthesized by dehydrochlorination of Cbz-(Z)-dehydrodipeptides containing an erythro-3-chloro-2-aminobutanoate moiety. Base-catalyzed transformation of the individual Cbz-(Z, Z)- and (Z, E)-dehydrodipeptides was carried out to give the corresponding new hydantoin derivatives. The NMR spectroscopic differences between the geometric isomers of both dehydrodipeptides and their hydantoin derivatives were elucidated.
Rapid Peptide Synthesis in Liquid Phase. Preparation of Angiotensin II and Delta-sleep-inducing Peptide by the “Hold-in-Solution” Method
Authors: Nozaki Sukekatsu , Muramatsu Ichiro 
Published: July 2006

Abstract
A new technique for rapid peptide synthesis has been demonstrated by the preparation of a protected angiotensin II, Z–Asp(OBzl)–Arg(NO2)–Val–Tyr(Bzl)–Ile–His(Bzl)–Pro–Phe–OBzl (1), and a protected delta-sleep-inducing peptide, Z–Trp–Ala–Gly–Gly–Asp(OBzl)–Ala–Ser(Bzl)–Gly–Glu(OBzl)–OBzl (2). Elongation of the peptide chain was carried out in 1,2-dichloroethane by repeating the following series of operations: acylation of a benzyl ester of amino acid or peptide with Boc-amino acid by 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride and 1-hydroxybenzotriazole; washing of the organic layer; acidolysis of the α-amino protector; neutralization; and washing. Throughout the synthesis, the growing pep tides were held in the organic layer without being isolated. The protected peptides, 1 and 2, were obtained in overall yields of 78% and 53% based on their C-terminal amino acid esters, and were then hydrogenated to give angiotensin II and delta-sleep-inducing peptide, respectively, thus demonstrating the usefulness of this method for rapid peptide synthesis.
Nucleophilic Reaction upon Electron-deficient Pyridone Derivatives. IV. Ring Transformation of 1-Substituted 3,5-Dinitro-2-pyridones with Ketones in the Presence of Amines
Authors: Matsumura Eizo , Tohda Yasuo , Ariga Masahiro 
Published: July 2006

Abstract
Ring transformation of 1-substituted 3,5-dinitro-2-pyridones with 1,3-disubstituted acetones in the presence of secondary or primary amines gave p-nitroaniline derivatives and N-substituted 2-nitroacetamide. Two types of enamine intermediates, 2-azabicyclo[3.3.1]nonene derivatives and N-substituted 2-(5-amino-2-nitro-2,4-cyclo-hexadienyl)-2-nitroacetamides were isolated and characterized. The course of the base-catalyzed reaction is interpreted.
Studies on 2-Methyl- and 2-Phenyl-4-arylmethylene-2-imidazolin-5-ones and Related Compounds
Authors: Badr Mahmoud Zarif , El-Sherief Hassan Ahmed Hassan , Tadros Magda Ebeid 
Published: July 2006

Abstract
Compounds 4-arylmethylene-2-methyl-2-oxazolin-5-ones and 4-arylmethylene-2-styryl-2-oxazolin-5-ones react with primary aromatic amines in the presence of anhydrous zinc chloride to give the corresponding 4-arylmethylene-2-methyl-2-imidazolin-5-ones and 4-arylmethylene-2-styryl-2-imidazolin-5-ones (5) respectively. Treatment of 5 with phosphorus pentasulfide gives the corresponding 2-imidazoline-5-thiones. Reaction of 4-arylmethylene-2-phenyl-2-oxazolin-5-ones with hydroxylamine hydrochloride gives the corresponding imidazolinones which was reacted with alkyl halides and acid chlorides to give the corresponding ethers and esters respectively. Structures of the resulting products have been characterized on the basis of elemental analysis, IR, and UV data.
Translational Energy Distribution of the Excited Hydrogen Atom (n=3) Obtained by Controlled Electron Impact on CH4
Authors: Ogawa Teiichiro , Kurawaki Junichi 
Published: July 2006

Abstract
Dissociative excitation of CH4 has been investigated through the analysis of the high resolution spectra of the Balmer-α line. Translational energy distribution of H*(n=3) obtained in e-CH4 collisions has three distinct components and another indefinite component; their peaks lie at 3, 0–1 and 4, and 8–12 eV, respectively.
A Convenient Method for the Preparation of S-Esters of Thio Analogs of Malonic Acid
Authors: Imamoto Tsuneo , Kodera Masahito , Yokoyama Masataka 
Published: July 2006

Abstract
2-Carboxyethanethioic S-esters(RSCOCH2COOH) and propanebis(thioic) S,S′-diesters (RSCOCH2COSR) were easily prepared in high yields by the direct condensation of malonic acid with thiols in the presence of ethyl polyphosphate (PPE).
Preparations and Characterization of Some Carbonyl(1-cyanoethyl)ruthenium(II) Complexes
Authors: Hiraki Katsuma , Ochi Naoyuki , Kitamura Tsuneyuki , Sasada Yoko , Shinoda Sumio 
Published: July 2006

Abstract
A hydridoruthenium(II) complex [RuClH(CO)(PPh3)3] reacted easily with acrylonitrile and fumaronitrile to give chloro-bridged binuclear (1-cyanoethyl)ruthenium(II) complexes, [{Ru(MeCHCN)Cl(CO)(PPh3)2}2] (2) and [{Ru(NCCH2CHCN)Cl(CO)(PPh3)2}2], respectively. Complex 2 reacted with 4-picoline (pic), Na[BHPz3] (Pz=1-pyrazolyl), Na[BPz4], and Na[Et2NCS2]·3H2O to afford the corresponding (1-cyanoethyl)ruthenium(II) complexes, [{Ru(MeCHCN)Cl(CO)(pic)(PPh3)}2] (3), [Ru(MeCHCN)(BHPz3)(CO)(PPh3)] (accompanied by a small amount of [Ru2(MeCHCN)2Cl(BHPz3)(CO)2(PPh3)4]), [Ru2(MeCHCN)2Cl(BPz4)(CO)2(PPh3)2], and Na[Ru(MeCHCN)Cl(Et2NCS2)(CO)(PPh3)], respectively. Complex 3 reacted with thallium(I) acetylacetonate [Tl(acac)], resulting in the formation of [{Ru(MeCHCN)(acac)(CO)(PPh3)}2] and [Ru(MeCHCN)(acac)(CO)(pic)(PPh3)]. These new complexes were characterized by means of elemental analysis and spectroscopic data. The diastereoisomerism was also discussed as regards these (1-cyanoethyl)ruthenium(II) complexes.
Non–covalent Interactions in Metal Complexes. V. Stereoselectivity in Cobalt(III) Mixed-chelates with a Salen-like Schiff Base and 1-l-Menthyloxy-3-benzoylacetone
Authors: Nakamura Michio , Okawa Hisashi , Inazu Takahiko , Kida Sigeo 
Published: July 2006

Abstract
Cobalt(III) mixed-chelates, Co(SB)(l-moba), containing a salen-type Schiff base (SB) and 1-l-menthyloxy-3-benzoylacetone (H(l-moba)) have been synthesized, where H2salen stands for N,N′-disalicylideneethylenediamine. These complexes were shown to have a cis-β-octahedral structure, based on electronic and infrared spectra. They showed circular dichroism in the visible region, demonstrating an induction of an asymmetry around the metal ion. On the basis of NMR and CD spectra and in comparison with the CD spectrum of Λ-Co(sal-(S, S)-ch)(bazc), it was shown that the Co(SB) (l-moba) complexes prefer the Λ-cis-β1-configuration. The reaction of racemic N,N′-disalicylidene-trans-1,2-cyclohexanediaminatocobalt(II) (Co(salch)) and racemic N,N′-disalicylidene-1,2-propanediaminatocobalt(II) (Co(salpn)) with H(l-moba) in a 2 : 1 mole ratio yielded Λ-cis-β1-Co(sal-(S, S)-ch)(l-moba) and Λ-cis-β1-Co(sal-(R)-pn)(l-moba), respectively, as amain species. The stereoselectivity in the present complexes has been discussed in terms of the inter-ligand, hydrophobic CH/π-interaction which may occur between the l-menthyl group and an aromatic ring of the Schiff bases.
Synthesis and Characterization of Copper(II) and Nikel(II) Complexes of 1,5-Diamino-3-pentanol and Its Derivatives
Authors: Murase Ichiro , Hatano Masao , Tanaka Masahiko , Ueno Shigehiro , Okawa Hisashi , Kida Sigeo 
Published: July 2006

Abstract
Dihydrochloride of a binucleating ligand, 1,5-diamino-3-pentanol (Hdpl·2HCl) has been synthesized by a new method in a high yield (&gt;70%). This ligand forms 1 : 1 complexes with copper(II), Cu(dpl)X(X=BF4, ClO4, NO3, and Cl(H2O)). The cryomagnetic study of the copper complexes has shown that they are binuclear, and a strong antiferromagnetic interaction is operating between two copper ions. The binuclear structure seems to be quite stable even in aqueous solution. The 1 : 1 complex with nickel(II) was also isolated as tetraphenylborate, which was essentially diamagnetic. A planar binuclear structure similar to the copper complexes was assumed for this complex. Its absorption band at 29.8×103 cm−1 (ε=160) was attributed to the charge transfer transition from the bridging oxygen to the nickel similarly to the bands in the 25–29×103 cm−1 region usually observed for alkoxo-oxygen bridged binuclear copper(II) complexes. Some 2 : 1 copper(II)–dpl complexes have also been synthesized and characterized as binuclear complexes. 1,5-Bis(dimethylamino)-3-pentanol has been synthesized, and its 2 : 1 copper(II) complexes have been isolated.
Synthesis of Dihydrobenzofuran Derivatives from Substituted p-Benzoquinones
Authors: Kozuka Tadashi 
Published: July 2006

Abstract
A series of p-benzoquinones having an ester functional group in the α position of alkyl side chains was prepared. Irradiation of these quinones, except for methyl 3-methyl-2-(4-methyl-3,6-dioxo-1,4-cyclohexadienyl)-butyrate (3e), rapidly gave methyl 3-substituted 2,3-dihydro-5-hydroxybenzofuran-2-carboxylate in fairly good yields, and it was found that rearrangement of the side chain occurred concomitantly. Photolysis of quinone 3e afforded methyl 2-(2,5-dihydroxy-4-methylphenyl)-3-methyl-3-butenoate as the major product. An intermediate was postulated to account for the isolated photoproduct.
Intramolecular 1,3-Dipolar Cycloaddition of Nitrilimines Bearing Alkenyl Groups
Authors: Shimizu Tomio , Hayashi Yoshiyuki , Ishikawa Susumu , Teramura Kazuhiro 
Published: July 2006

Abstract
The reaction of the arylhydrazones of some 2-(alkenyloxy)benzaldehydes(or 1-naphthaldehydes) with Pb(OAc)4 leads, via the nitrilimine intermediates, to intramolecular 1,3-dipolar cycloadducts, 3-substituted 2-aryl-2,3,3a,4-tetrahydro[1]benzopyrano(or naphtho[1′,2′:5,6]pyrano)[4,3-c]pyrazoles, in 10–80% yields. In the presence of an excess of Pb(OAc)4, these cycloadducts were dehydrogenated to 3-substituted 2-aryl-2,4-dihydro[1]benzopyrano(or naphtho[1′,2′:5,6]pyrano)[4,3-c]pyrazoles. In the presence of a large excess of Pb(OAc)4, some of the pyrazoles were acetoxylated to give the corresponding 4-acetoxypyrazoles. The effect of substituents of the alkenyl group on reactivity of the reaction was interpreted in terms of the frontier molecular orbital (FMO) theory.
Syntheses and Properties of the Polymethylenebis(diphenylcyclopropenium) Dications
Authors: Komatsu Koichi , Masumoto Katsuhisa , Waki Yoshinori , Okamoto Kunio 
Published: July 2006

Abstract
A series of polymethylenebis(diphenylcyclopropenium) dications with the polymethylene chain of one to six carbons (4n=1–6) were synthesized and characterized by spectral and analytical means. Among the dications 4n=3–6 which were isolated as perchlorates, 4n=3 was shown by the pKR+ measurements to be destabilized by 1.3 pK units as compared with 4n=4–6. The values of reduction potential exhibited the same tendency. The chromium(II) ion reduction of 4n=6, a representative dication, afforded a polymeric material containing a hexylbenzene unit. The dication 4n=2 was isolable only as a complex salt with SbCl6− and Cl−: the conventional hydride abstraction from 1,2-dicyclopropenylethane using trityl perchlorate resulted in rearrangements affording 4,9,10-triphenylphenanthrene and the unknown monocation C32H25+ containing the tropylium ring. A possible mechanism for these rearrangements is presented. On the other hand, the dication 4n=1 was observable only in a highly acidic solution due to the ready deprotonation yielding a new fully conjugated monocation 17. This cation, characterized by remarkable stability (pKR+ 8.9 in 50% aq acetonitrile), is formally represented as a triafulvene with a cyclopropenium ring substituted at the 4-position, but is shown to have a partially polarized electronic structure by 13C NMR spectroscopy.
Characterization of Nitrogen-containing Active Carbon Catalysts for SO2 Removal
Authors: Nishijima Akio , Hagiwara Hiroyuki , Kurita Minoru , Ueno Akifumi , Sato Toshio , Kiyozumi Yoshimichi , Todo Naoyuki 
Published: July 2006

Abstract
Physical and chemical properties of nitrogen-containing active carbons (ACs), having a much higher activity and capacity for SO2 adsorption than commercial ACs, were investigated to define suitable properties for SO2 removal. The capacity of nitrogen-containing ACs for SO2 adsorption correlates with the amount of their surface basic groups. However, the amount of basic surface groups for the ACs is practically the same as that for commercial ACs, indicating that the ACs have another characteristic property effective for SO2 removal. A study on the chemical state of surface nitrogen atoms by means of an X-ray photoelectron spectrometer has revealed that surface nitrogen species are effective for SO2 adsorption.
The Effect of Ultraviolet Radiation on Wettability of Silane Coupling Agents Coated on Glass
Authors: Esumi Kunio , Meguro Kenjiro , Schwartz Anthony M , Zettlemoyer Albert C 
Published: July 2006

Abstract
The effect of ultraviolet irradiation on wettability of silane coupling agents coated on glass was studied by using contact angle measurements. The water contact angle for the silane coupling agents decreased due to photooxidation as the irradiation progressed. It was found that silane coupling agents which contain vinyl, allyl, or phenyl groups were easily photooxidated by the irradiation.
The Group Coordinate Force Field of Oxymethylene and Thiomethylene Chain Molecules
Authors: Matsuura Hiroatsu , Murata Hiromu 
Published: July 2006

Abstract
Force field was systematically determined in terms of the group symmetry coordinates for series of CH3-(OCH2)mOCH3 (m=1–3), the polymer (–OCH2–)n, and their deuterated derivatives, and of CH3(SCH2)mSCH3, (–SCH2–)n, and their deuterated derivatives. Twenty-five force constants for the oxymethylene molecules and twenty-two force constants for the thiomethylene molecules were adjusted by using 178 and 126 observed wave-numbers, respectively. The force constants obtained were compared with those for related molecules. The results of the normal coordinate treatment on the polymers were discussed in comparison with the results in previous works.