bluuebunny/crossref_metadata_2025_split huggingface dataset:
Hydroformylation of ω-Functionalized 1,1-Disubstituted Alkenes and Its Use Toward the Synthesis of (±)Muscone
Authors: Takahashi Takashi , Machida Kazuhiro , Kido Yoichi , Nagashima Kensuke , Ebata Satoshi , Doi Takayuki 
Published: May 2005

Abstract
The rhodium-catalyzed hydroformylation of ω-functionalized 1,1-disubstituted alkenes and the synthesis of (±)-muscone using this hydroformylation and cyanohydrin alkylation are described.
Resonance Raman Characterization of Antimony(III) Hyperporphyrin
Authors: Teraoka Junji , Ishimaru Hirohito 
Published: May 2005

Abstract
The resonance Raman spectra of a hyperporphyrin, (octaethylporphyrinato) antimony (III) chloride [Sb(OEP)]Cl, have been measured using excitations within a split Soret band in the near-UV and visible regions. No evidence could be found for a possibility that either of the Soret bands had a charge transfer character.
Structure and Stereodynamics of N-Ethyl-N-9-triptycylacetamide: Co-existence of Z- and E-Isomers in a Single Crystal and Pyramidal Amide Nitrogen Both in Crystal and in Solution
Authors: Yamamoto Gaku , Tsubai Natsuko , Murakami Hiroaki , Mazaki Yasuhiro 
Published: May 2005

Abstract
A single crystal of N-ethyl-N-9-triptycylacetamide contains the Z- and E-isomers in a ratio of 1 : 1. The amide nitrogen atom in either isomer is significantly pyramidalized. Either of the isomers in solution is shown to adopt a similar conformation with the pyramidal nitrogen as in the crystalline state.
Fabrication of Ordered Diamond/metal Nanocomposite Structures
Authors: Masuda Hideki , Yasui Kenji , Watanabe Mitsuo , Nishio Kazuyuki , Rao Tata N , Fujishima Akira 
Published: May 2005

Abstract
Highly ordered diamond/Au nanocomposite structures were fabricated by preparing a honeycomb structured diamond film and subsequent Au deposition into holes by vacuum deposition. The cross-sectional SEM image of the composite film showed Au nanodots at the bottom of the holes. The optical absorption spectrum of the composite film showed a characteristic absorption due to the surface plasmon resonance at the wavelength of ~520 nm, indicating the possible application of honeycomb diamond in optoelectronics.
Synthesis and Characterization of Bis(iminopyrrolyl)zirconium Complexes
Authors: Matsuo Yutaka , Mashima Kazushi , Tani Kazuhide 
Published: May 2005

Abstract
Diamido and dichloro zirconium complexes having two iminopyrrolyl ligands, Zr(Net2)2(pyr)2 (2a–e) (pyr = 2-(N-aryliminomethyl)pyrrolyl) and ZrCl2(pyr)2 (3a–e), were prepared. The cis-configuration of diamido and dichloro moieties was elucidated on the basis of NMR spectroscopy as well as by a crystallographic study for complex 3a. We demonstrated that these zirconium complexes became catalyst precursors for the polymerization of ethylene in the presence of excess amounts of methylaluminoxane.
Generation of Hydrogen from Methanol in a Dielectric-Barrier Discharge-Plasma System
Authors: Tanabe Shuji , Matsuguma Hiroshi , Okitsu Kenji , Matsumoto Hiroshige 
Published: May 2005

Abstract
The decomposition of CH3OH was investigated in a dielectric-barrier discharge-plasma induced by low power from 0.27 to 6.40 Wh(Ncm3)−1. The maximum CH3OH conversion of 80% into H2 was achieved with CO or CO2 being the other major product, respectively, in the absence or presence of water.
Effect of Preparation Conditions of Titanium Oxide on Dinitrogen Fixation to Ammonium Salt
Authors: Hoshino Katsuyoshi , Kitamura Takashi 
Published: May 2005

Abstract
Dinitrogen fixation to solid needles of ammonium perchlorate was found to occur upon white light irradiation to composite systems of poly(3-methylthiophene) and titanium oxides (native, thermally-grown, and sputtered oxides) under ambient conditions of temperature and pressure.
Synthesis and Curing of Crosslinkable Polyphenols from Urushiol Analogues
Authors: Tsujimoto Takashi , Ikeda Ryohei , Uyama Hiroshi , Kobayashi Shiro 
Published: May 2005

Abstract
New crosslinkable polyphenols were designed on the basis of model “urushi” and synthesized by oxidative polymerization of urushiol analogues, phenol derivatives bearing an unsaturated group. The polyphenols were readily cured to give crosslinked polymeric films with high gloss surface.
Sonochemical Reactions of Lead Tetraacetate with 4-Substituted Styrenes
Authors: Ando Takashi , Kimura Takahide , Levêque Jean-Marc , Fujita Mitsue , Luche Jean-Louis 
Published: May 2005

Abstract
A good linear free energy relationship was observed between the radical reactivity of the sonochemical reactions of 4-substituted styrenes with lead tetraacetate and the vapor pressure of the styrenes, indicating a probable control of the process by an intra-bubble activation.
New Treatment Methods for Waste Water Containing Chloride Ion Using Magnesium–Aluminum Oxide
Authors: Kameda Tomohito , Miyano Yoshinori , Yoshioka Toshiaki , Uchida Miho , Okuwaki Akitsugu 
Published: May 2005

Abstract
The removal of hydrochloric acid utilizing magnesium-aluminum oxide (Mg–Al oxide), as prepared by the thermal decomposition of hydrotalcite (HT), was investigated. Cl− in hydrochloric acid can be removed almost 100% by adding 1.75 times the stoichiometric quantity of Mg0.70Al0.20O at 60 °C for 1 h. Mg2+ and Al3+ in solution after the reaction were not recognized, because the solution was weakly alkaline.
Nonlinear Optical Response of Colloidal Gold Nanoparticles Studied by Hyper-Rayleigh Scattering Technique
Authors: Shen Yao-chun , Tang Zuming , Gui Minzhi , Cheng Jiqi , Wang Xing , Lu Zuhong 
Published: May 2005

Abstract
Hyper-Rayleigh scattering (HRS) technique is used to study the nonlinear optical response of nanocrystalline gold particle suspensions. The signal intensity measured at 400 nm has a cubic dependence on the pump laser energy at 1064 nm, indicating that the measured signal is due to a third-order nonlinear optical process, namely three-photon excited fluorescence (3PF). To the best of our knowledge, this is the first experimental observation of 3PF for colloidal gold nanoparticle suspensions.
Intercalation of Spirooxazine Induced by Zinc Cation Chelation in Montmorillonite and Its Photochromic Behavior
Authors: Nishikiori Hiromasa , Sasai Ryo , Arai Norio , Takagi Katsuhiko 
Published: May 2005

Abstract
Spirooxazine (SPO) was introduced into hydrophobically modified montmorillonite dispersed in acetone under UV illumination in the presence of zinc ions. The fluorescence spectra of the samples exhibited photochromic behavior arising from the photo-induced interconversion between the original species of SPO and the Zn-chelated complex of the SPO-derived merocyanine.
Synthesis of Microporous Silica in the Presence of Dodecyldimethylbenzylammonium Chloride Surfactant
Authors: Yuan Zhong-Yong , Zhou Wuzong , Peng Lian-Mao 
Published: May 2005

Abstract
Microporous silicas with pore sizes in the range intermediate between traditional microporous and mesoporous materials have been synthesized by using dodecyldimethylbenzylammonium chloride as a template. These microporous silicas can be synthesized by either acidic S+X−I+ or basic S+I− assembly pathways and consist of disordered channels with almost identical pore sizes of 12.2 Å in both cases. Their BET surface areas are larger than 1000 m2/g after being calcined in air.
A Novel Molecular System for Nitric Oxide Detection with High Sensitivity
Authors: Katayama Yoshiki , Soh Nobuaki , Koide Kazuhiro , Maeda Mizuo 
Published: May 2005

Abstract
A novel molecular switching system was developed for the direct detection of endogenous nitric oxide. The system is comprised from an Fe(II)–dithiocarbamate complex in which TEMPOL molecule coordinates to the centered iron through a redox interaction. Nitric oxide binds to the iron to liberate the TEMPOL. The system will be potentially useful for the monitoring of endogenous nitric oxide.
Electrochemical Behavior of Graphite Electrode for Lithium Ion Batteries in Mn and Co Additive Electrolytes
Authors: Kumagai Naoaki , Komaba Shinichi , Kataoka Yoichi , Koyanagi Makoto 
Published: May 2005

Abstract
Dissolution of Mn into an electrolyte from LiMn2O4 in Li ion cell is researched recently. To study an influence of the dissolved manganese species on performance of negative electrode, electrochemical behavior of graphite was investigated in LiClO4 solution containing Mn2+ by dissolving Mn(ClO4)2. During charging, manganese ions were firstly electroreduced on the electrode, followed by Li intercalation into graphite. Mn deposition was confirmed after charge-discharge test, furthermore, the reversible capacity of lithium intercalation was decreased. The results were compared to those in a cobalt additive electrolyte.
Polymeric and Monomeric Forms of a Schiff Base–Nitridomanganese(V) Complex. Synthesis and Crystal Structure
Authors: Tsuchimoto Masanobu , Iwamoto Hirofumi , Kojima Masaaki , Ohba Shigeru 
Published: May 2005

Abstract
A novel polymeric nitridomanganese(V) complex with a Schiff base ligand [MnN(salpn)] (H2(salpn): N,N′-disalicylidene-1,3-propanediamine) (1) was prepared by photolysis of the azidomanganese(III) complex, [MnN3(salpn)] in acetonitrile. The monomeric complex (2) was obtained by recrystallization of 1 from methanol. X-Ray crystal structure analyses of 1 and 2 were carried out. The brown complex 1 has a linear ···Mn≡N···Mn≡N··· chain structure.
Cherenkov Counting Efficiencies for β−-Emitters in Dry State in Glass Vials
Authors: Morita-Murase Yuko , Murakami Isao , Homma Yoshio 
Published: May 2005

Abstract
Cherenkov counting efficiencies for standardized β−-emitters in the dry state at the centre of air-filled glass vials were measured with a liquid scintillation spectrometer. Cherenkov counting efficiencies, which are plotted as a function of the average energy of β−-particles and the internal conversion electrons, give a straight line on log–log scale.
Selective Hydrogen Production from Cellulose at Low Temperature Catalyzed by Supported Group 10 Metal
Authors: Usui Yoko , Minowa Tomoaki , Inoue Seiichi , Ogi Tomoko 
Published: May 2005

Abstract
Cellulose, a major component of woody biomass, reacts in hot-compressed water at 350 °C and 160–200 atm in the presence of a supported group 10 metal catalyst (2 wt%) for 10 min to give gas, consisting of hydrogen, carbon dioxide, and methane. Hydrogen was produced in high yield (8.1 mmol/g cellulose) and high selectivity (H2/CH4 = ca. 6) catalyzed by a supported Ni, Pd, or Pt. Among them, Pd supported on Al2O3 particularly had highest catalytic activity for this gasification.
Tetrahedral Distortion in Copper(II) Complexes of (−)-Sparteine and Its Effect on the Oxygen Adduct Formation
Authors: Funahashi Yasuhiro , Nakaya Kaori , Hirota Shun , Yamauchi Osamu 
Published: May 2005

Abstract
The Cu(II) complexes of (−)-sparteine (Sp) have been revealed to have tetrahedrally distorted structures in both monomeric and hydroxo-bridged dimmeric forms due to the steric requirements of Sp. Resonance Raman and UV absorption spectra indicated that the Cu(I) complex of Sp reacted with O2 at −80 °C to form a distorted CuIII2(µ–O)2 structure.
First Asymmetric Photochemistry with Nucleosides and DNA: Enantiodifferentiating Z–E Photoisomerization of Cyclooctene
Authors: Wada Takehiko , Sugahara Norimitsu , Kawano Mahito , Inoue Yoshihisa 
Published: May 2005

Abstract
Thymidine and uridine, as well as calf thymus DNA (ctDNA), have been shown for the first time to function as chiral photosensitizers in aqueous solution, to effect the enantiodifferentiating photoisomerization of (Z)-cyclooctene, giving the chiral (E)-isomer in enantiomeric excesses of up to 15%.
Extremely High Enantiomer Recognition in HPLC Separation of Racemic 2-(Benzylsulfinyl)benzamide Using Cellulose Tris(3,5-dichlorophenylcarbamate) as a Chiral Stationary Phase
Authors: Chankvetadze Bezhan , Yamamoto Chiyo , Okamoto Yoshio 
Published: May 2005

Abstract
An extremely high enantioselectivity of cellulose tris(3,5-dichlorophenylcarbamate) was found when it was used as a chiral stationary phase (CSP) in high-performance liquid chromatography (HPLC). The enantioseparation factor (α = 112) reported in this system for 2-(benzylsulfinyl)benzamide seems to be the highest among many enantiomer-differentiating separations using polysaccharide derivatives as CSPs.
Effective Activation of ‘Armed’ Thioglycoside with a New Combination of Trityl Tetrakis(pentafluorophenyl)borate [TrB(C6F5)4] and N-(Ethylthio)phthalimide (PhthNSEt)
Authors: Jona Hideki , Takeuchi Kazuya , Saitoh Terunobu , Mukaiyama Teruaki 
Published: May 2005

Abstract
Glycosylation of the ‘armed’ thioglycoside with various glycosyl acceptors is promoted by using a combination of stoichiometoric amount of N-(ethylthio)phthalimide (PhthNSEt) and catalytic amount of trityl tetrakis(pentafluorophenyl)borate [TrB(C6F5)4], and is successfully applied to one-pot ‘armed–disarmed’ sequential synthesis of trisaccharides.
Facile Synthesis of Optically Active Tertiary Alcohol Building Blocks by Stereospecific C–H Insertion Reaction of Dichlorocarbene with Secondary Alcohol Derivatives
Authors: Masaki Yukio , Arasaki Hideki , Shiro Motoo 
Published: May 2005

Abstract
Stereospecific C–H insertion of dichlorocarbene generated from a system CHCl3/50%NaOH/cetyltrimethylammonium chloride (as a PTC) proceeded at the carbinol carbon in the reaction of chiral secondary alcohol derivatives to provide α-dichloromethylated tertiary alcohol derivatives with complete retention of configuration.
Homogeneous N,O-Acylation of Chitosan in Dimethyl Sulfoxide with Cyclic Acid Anhydrides
Authors: Sashiwa Hitoshi , Shigemasa Yoshihiro , Roy René 
Published: May 2005

Abstract
By using soluble chitosan (1R)-(−)-10-camphorsulfonate salt (chitosan-CSA), N,O-acylated chitosans were prepared in dimethyl sulfoxide (DMSO) with cyclic acid anhydride under homogeneous conditions.
Redox Behavior of Human Serum Albumin–Heme Hybrid on Graphite Electrode Modified with Didodecyldimethylammonium Bromide
Authors: Wu Yuping , Komatsu Teruyuki , Tsuchida Eishun 
Published: May 2005

Abstract
The redox behavior of a synthetic hemoprotein, the recombinant human serum albumin (rHSA), incorporating a tetraphenylporphinatoiron derivative (FeP) [rHSA-FeP] was first evaluated using a graphite electrode modified with didodecyldimethylammonium bromide as a promoter. Compared to that of the naked FeP, the redox potential of the Fe(III)/Fe(II) couple in rHSA-FeP shifts in the positive direction, indicating that the central ferrous ion of FeP becomes more difficult to be oxidized by incorporation into the albumin structure.
Indium-Mediated Facile Dehydration and Beckmann Rearrangement of Oximes
Authors: Barman Dhiren C , Thakur Ashim J , Prajapati Dipak , Sandhu Jagir S 
Published: May 2005

Abstract
Indium chloride has been developed as an efficient reagent for the conversion of aldoximes to nitriles and the Beckmann rearrangement of ketoximes to anilides.
Synthesis of Manganite Perovskites by Reverse Homogeneous Precipitation Method in the Presence of Alkylammonium Cations
Authors: Teraoka Yasutake , Nanri Shinichi , Moriguchi Isamu , Kagawa Shuichi , Shimanoe Kengo , Yamazoe Noboru 
Published: May 2005

Abstract
A single-phase LaMnO3+δ perovskite with high surface area could be synthesized after air-calcining the hydroxide precursor at 650 °C and above. The precursor was easily obtained by dropping a mixed aqueous solution of La and Mn nitrates into highly basic aq. NH3 with and without the presence of N(CH3)4Br. The addition of N(CH3)4Br was effective in increasing the specific surface area of the products as well as in stabilizing the colloidal solution of the hydroxide precursor.
Photocatalytic Water Splitting into H2 and O2 over K2LnTa5O15 Powder
Authors: Kudo Akihiko , Okutomi Hiroaki , Kato Hideki 
Published: May 2005

Abstract
K2LnTa5O15 (Ln = La, Pr, Nd, Sm, Gd, Tb, Dy, and Tm) loaded with NiO co-catalysts showed photocatalytic activities for water splitting into H2 and O2 in stoichiometric amounts under UV light irradiation (h&#957 &gt; 3.9-4.1 eV). The photocatalytic activities strongly depended on the lanthanide ions. Among them, K2PrTa5O15 and K2SmTa5O15 showed relatively high activities.
Artificial Urushi: Design, Synthesis, and Enzymatic Curing of New Urushiol Analogues
Authors: Kobayashi Shiro , Ikeda Ryohei , Oyabu Hiroshi , Tanaka Hozumi , Uyama Hiroshi 
Published: May 2005

Abstract
“Artificial urushi” was prepared by laccase-catalyzed curing of new urushiol analogues. The curing of the catechol derivative having a linolenoyl group proceeded in the presence of acetone powder, yielding the crosslinked film (artificial urushi) with high hardness and gloss surface, which are comparable with those of natural urushi coating.
Stereoselective Formation of Cyclopropylsilane through Intramolecular Rearrangement of [(Allyloxy)dimesitylsilyl]lithiums
Authors: Kawachi Atsushi , Maeda Hirofumi , Tamao Kohei 
Published: May 2005

Abstract
A [(sec-allyloxy)dimesitylsilyl]stannane bearing a phenyl group on the olefin part reacts with n-BuLi in THF to give a cyclopropylsilane as a single diastereomer, in contrast to the [2,3]-sila-Wittig rearrangement affording an allylsilane, previously observed for a substrate bearing an alkyl group on the olefin part. The striking substituent effect is revealed by ab initio calculations in terms of the regioselectivity in the reaction of silyllithiums with an olefin.
Removal of Palladium(II) from Aqueous and Organic Solutions by Polystyrene-bound Trimercaptotriazine
Authors: Ishihara Kazuaki , Nakayama Masaya , Kurihara Hideki , Itoh Akihide , Haraguchi Hiroki 
Published: May 2005

Abstract
Polystyrene-bound 2,4,6-trimercapto-s-triazine was prepared from 2,4,6-trimercapto-s-triazine (TMT) and Merrifield resin in a single step. Treatment with polymer-bound TMT was highly effective for reducing the concentration of residual Pd(II) in aqueous and organic solutions.
Electronic Structure and Chemical Bonding of Li and Protons in Spinel Type Manganese Oxides by Cluster Calculation
Authors: Kim Yang-Soo , Kanoh Hirofumi , Chitrakar Ramesh , Hirotsu Takahiro , Ooi Kenta 
Published: May 2005

Abstract
A study of the electronic structure and chemical bonding of the Li and proton exchange in spinel-type manganese oxides is performed by a first-principles molecular-orbital method using model clusters composing of 57 atoms. The discrete-variational (DV)-Xα method was employed and Mulliken’s population analyses were thoroughly conducted. We found that Li and proton in manganese oxides is highly ionized. Strong covalent interactions between Mn and O can be noted.
Ring Contraction of 1,2-Digermacyclohexa-3,5-dienes Initiated by Electron Transfer Reactions with TCNE
Authors: Mochida Kunio , Shimizu Hiromi , Nanjo Masato 
Published: May 2005

Abstract
The thermal reaction of 1,2-digermacyclohexa-3,5-dienes with tetracyanoethylene (TCNE) gave 1-germacyclopenta-2,4-diene as a germylene extrusion compound through a charge-transfer complex. The 1-germacyclopenta-2,4-diene was trapped with TCNE to give 5,5,6,6-tetracyano-7-germanorbornene.
Stereoselective (2π + 2π) Photocycloaddition of Arylalkenes to Chrysene
Authors: Maeda Hajime , Waseda Shigeyuki , Mizuno Kazuhiko 
Published: May 2005

Abstract
Photocycloaddition of electron-deficient arylalkenes to chrysene stereoselectively occurred at 5,6-position of chrysene ring to give two (2π + 2π) photocycloadducts through sandwich-type singlet exciplexes. Photocycloreversion took place via the excited singlet states of the photocycloadducts.
Infrared Photodissociation Spectra of Halomethane Halide Cluster Anions and Their Solvation Structures
Authors: Ichihashi Masahiko , Sadanaga Yasuhiro , Lisy James M , Kondow Tamotsu 
Published: May 2005

Abstract
Solvation structures of X−(CH3X)n (X = Cl and Br) were studied by use of infrared photodissociation spectroscopy (925–1090 cm−1) together with mass spectroscopy. The cluster anion, X−(CH3X)n (n ≥ 13) was found to have an absorption peak at a vibrational wavenumber, which is comparable to that of the X–C–H bending mode of a free CH3X molecule. On the other hand, X−(CH3X)12 did not exhibit any detectable absorption at the wavenumbers studied. It was concluded that the first solvation shell of the cluster anion is completed at n = 12 (icosahedral structure), and that with a sub-shell is completed at n = 18 (capped icosahedral structure).
Preparation of a New Class of Inner Salts by Formal Addition of Tosyl Nitrene to the Sulfur Atom of Inner Salts, α-Carbeniodithiocarboxylates
Authors: Nakayama Juzo , Zhao Liting , Otani Takashi , Sugihara Yoshiaki , Ishii Akihiko 
Published: May 2005

Abstract
2,2-Bis(diethylamino)-2-ethylium-1-dithiocarboxylate (1a) was S-iminated by [N-(p-tolylsulfonyl)imino]phenyliodinane to provide a novel inner salt (4a) that formally possesses a thione-S-imide structure (&gt;C=S=NR) as one of the canonical structures.
A New and One-Pot Synthesis of α,β-Unsaturated Ketones by Dehydrogenation of Various Ketones with N-tert-Butyl Phenylsulfinimidoyl Chloride
Authors: Mukaiyama Teruaki , Matsuo Jun-ichi , Kitagawa Hideo 
Published: May 2005

Abstract
α,β-Unsaturated ketones were synthesized by one-pot procedure from various ketones in good to excellent yields on treatment of their lithium enolates with N-tert-butyl phenylsulfinimidoyl chloride (1) under mild conditions.
Synthesis and Characterization of Amorphous Phosphorus Nitride
Authors: Meng Zhaoyu , Peng Yiya , Yang Zhiping , Qian Yitai 
Published: May 2005

Abstract
Amorphous phosphorus nitride (P3N5) has been synthesized from the reaction of PCl5 and NaN3 in an autoclave at 190–300 °C. XPS, IR and TEM revealed that the product was amorphous P3N5 with flake-like morphology. The influences of experimental conditions were discussed.
IR Evidence for the Generation of (C5H5)Mn(CO)2(N2O) in Near-Critical N2O at Room Temperature and in Polyethylene Matrices at Low Temperature
Authors: Molvinger Karine , Childs Gavin I , Jobling Margaret , Roper Mark , George Michael W , Poliakoff Martyn 
Published: May 2005

Abstract
UV photolysis of CpMn(CO)3 (Cp = C5H5) in near critical liquid N2O at room temperature in both static and flow reactors leads to the formation of CpMn(CO)2(N2O) identified via ν(C–O) and ν(N2O) IR bands, the latter being recorded in low temperature polyethylene (PE) experiments. CpMn(CO)2(N2O) has a lifetime of ca. 5 min at room temperature in near-critical N2O and appears to have two decay pathways one of which leads to CpMn(CO)2(N2), possibly via O-transfer.
Mordenite-Supported Noble Metal Catalysts for Selective Oxidation of Carbon Monoxide in a Reformed Gas
Authors: Igarashi Hiroshi , Uchida Hiroyuki , Watanabe Masahiro 
Published: May 2005

Abstract
Selective oxidation of carbon monoxide in high excess of H2 was examined on noble metal catalysts (Pt, Ru, Pd, Co, and Pt-Ru) supported on mordenite. Pt-Ru/mordenite exhibited fairly high selectivity over a wide flow rate condition even at 150 °C. Thus, it seems to be a promising catalyst for polymer electrolyte fuel cells operated with reformed gas.
Remarkable Temperature Dependence of Two-Photon Absorption Spectrum of Poly(dihexylsilylene) in Solution
Authors: Miyazawa Takashi , Saeki Titao , Liu Chengyou , Kira Mitsuo 
Published: May 2005

Abstract
The nonresonant two-photon absorption spectrum of poly(dihexylsilylene) (1) in 3-methylpentane solution showed an abrupt thermochromism with a similar transition temperature to the one-photon absorption spectrum of 1. The parallel temperature dependence between the one-photon and two-photon absorption spectra suggests that the two-photon excited state involves an important contribution of the σ–σ* excited electronic configurations.