bluuebunny/crossref_metadata_2025_split huggingface dataset:
New Kemp’s Diacid Derivatives Give Efficient Transport and Modifiable Selectivity for Alkaline Earth and Transition Metal Ions
Authors: Baldwin Bruce W , Hirose Takuji , Wang Zhen-He , Uchimaru Tadafumi , Yliniemelä Ari 
Published: June 2006

Abstract
New derivatives of 1,3,5-trimethyl-r-1, c-3, c-5-cyclohexanetricarboxylic acid (Kemp’s triacid) showed high efficiency for alkaline earth and transition metal ion transport through a chloroform liquid membrane. Simple syntheses from Kemp’s triacid or its geometric isomer provided chelating agents with a tripodal binding site for metal cations. The tripodal binding site consisted of r-1, c-3-diaxial carboxyl group and a c-5-amide, ester, or C-methyl group. Alkaline earth metal transport was quite variable and sensitive to c-5-group changes. For transition metal transport, c-5-amide diacids gave high total transport efficiency. For c-5-ester or C-methyl diacids, complexation of smaller divalent cations was decreased, resulting in increased selectivity for large cations.
A Theoretical Study of Dioxygen Activation on the Dicopper Enzyme Model
Authors: Yoshizawa Kazunari , Ohta Takehiro , Yamabe Tokio 
Published: June 2006

Abstract
Dioxygen activation on the dicopper enzyme model was studied using fragment molecular orbital (FMO), Walsh-diagram, and molecular orbital overlap population (MOOP) analyses within the framework of the extended Hückel method. A dicopper peroxo model complex with a μ-η2 : η2-O2 binding mode is distorted to a corresponding dioxo complex with a Cu2(μ-O)2 diamond core along an assumed reaction coordinate describing O–O bond cleavage. FMO and Walsh-diagram analyses have clarified the bonding and orbital interactions between the dicopper active site and dioxygen. While the πg* orbitals of dioxygen begin with two electrons, in the early O2 binding stages two other electrons are effectively transferred from the copper d-block orbitals to O2. Qualitative calculations show that O–O bond cleavage should proceed with no cost of activation energy on the dicopper active site of actual enzyme systems.
Rearrangement Approaches to Cyclic Skeletons. XII. Acid-Catalyzed Isomerization of Bicyclo[3.2.1]oct-6-en-2-ones into Bicyclo[3.2.1]oct-3-en-2-ones without Racemization
Authors: Uyehara Tadao , Inayama Toshihiro , Kobari Takanobu , Kimura Yuuko , Yoneta Noriko 
Published: June 2006

Abstract
The treatment of a bicyclo[3.2.1]oct-6-en-2-one (3) with Amberlyst® (H-15) in boiling benzene gave a mixture of bicyclo[3.2.1]oct-3-en-2-one (5) and bicyclo[2.2.2]oct-5-en-2-one (6). The ratio of 5 to 6 was influenced by the substituent at the C-1 position of the ketone 3. Chiral ketones 3 were transformed into the chiral α,β-unsaturated ketones 5 without racemization.
Synthesis and Structure of [6](1,4)Naphthalenophane and [6](1,4)Anthracenophane and Their Peri-Substituted Derivatives
Authors: Tobe Yoshito , Saiki Shinji , Minami Hirokazu , Naemura Koichiro 
Published: June 2006

Abstract
[6](1,4)Naphthalenophane (1a), [6](1,4)anthracenophane (2a), and their peri-substituted derivatives 1b, 1c, and 2b were synthesized from 8-bromo[6]paracyclophane (4) by a benzoannelation method. The 1H NMR spectral properties of 1b, 1c, and 2b as well as the X-ray crystallographic structure analysis of 1b indicate that their bridged aromatic rings are more distorted than those of the corresponding parent systems, 1a and 2a. Thermally reversible photochemical isomerization of 1b and 2b took place readily, giving the corresponding Dewar valence isomers, 10b and 11b.
Syntheses and Structures of Synthetic Carboxylic Ionophores Containing 2,3-Naphthylene Groups
Authors: Chikaraishi-Kasuga Noriko , Onoue Ken-ichi , Osawa Yutaka , Nakahama Seiichi , Ohashi Yuji , Yamaguchi Kazuo 
Published: June 2006

Abstract
Two derivatives of ω-hydroxy carboxylic ionophore 2-[[2-[2-[2-[2-[2-[2-[2-(2-hydroxyethoxy)phenoxy]ethoxy]phenoxy]ethoxy]phenoxy]ethoxy]phenoxy]methyl]benzoic acid 1, 2-[[3-[2-[2-[2-[2-[2-[3-(2-hydroxyethoxy)-2-naphthyloxy]ethoxy]phenoxy]ethoxy]phenoxy]ethoxy]-2-naphthyloxy]methyl]benzoic acid 2 and 2-[[3-[2-[2-[2-[3-[2-[2-(2-hydroxyethoxy)phenoxy]ethoxy]-2-naphthyloxy]ethoxy]phenoxy]ethoxy]-2-naphthyloxy]methyl]benzoic acid 3, were prepared. Both compounds exhibited high K+ selectivity over Na+, as did 1. The structures of the Rb salt of 2 and the K salt of 3 were determined by single-crystal X-ray analyses. Both ionophores formed psuedocycles by a head-to-tail hydrogen bond between the hydroxy and carboxylato groups and enclosed each cation like the seam of a tennis ball to make lipophilic complexes. However, the three-dimensional structures of the two hydrophobic salts differed from each other in spite of the similarity of the primary structures, which might be due to the interaction of the aromatic rings.
Chiral Discrimination by 4-Chloro- and 4-Bromophenylcarbamates of Maltooligosaccharides in HPLC, NMR, and CD
Authors: Yashima Eiji , Sahavattanapong Pennapa , Yamamoto Chiyo , Okamoto Yoshio 
Published: June 2006

Abstract
4-Chloro- and 4-bromophenylcarbamates of maltooligosaccharides (n = 5, 6, and 7) were prepared and their chiral recognition abilities as a chiral stationary phase for HPLC were evaluated. The maltooligosaccharides carbamates exhibited a characteristic chiral recognition depending on the racemates and resolved several racemates in HPLC. The enantioselectivity as well as elution order of enantiomers on the maltooligosaccharide derivatives were similar to those on the corresponding amylose phenylcarbamte derivatives. The maltooligosaccharides also showed chiral discrimination for some racemates in NMR; the proton resonances of racemates, such as trans-stilbene oxide, benzoin, and 1,2,2,2-tetraphenylethanol were split into a pair of peaks due to the enantiomers. A good correlation between the NMR results and the chromatographic elution order was observed for most racemates. An enantiomeric guest, bilirubin, was also chirally discriminated by the maltooligosaccharides in chloroform to show an induced CD. The structures of the maltohexaose derivatives were examined by molecular mechanics and molecular dynamics simulations.
Formation of Glyoxylic Acid by Oxidative Dehydrogenation of Glycolic Acid
Authors: Ai Mamoru , Ohdan Kyoji 
Published: June 2006

Abstract
Iron phosphates with a P/Fe atomic ratio of 1.2 were found to be effective as catalysts for a vapor-phase oxidative dehydrogenation of glycolic acid to glyoxylic acid. The effects of the reaction variables on the conversion and selectivity were studied. The optimum reaction temperature was around 240 °C and the optimum feed rate of oxygen was in the range of 10 to 25 mmol h−1 when the feed rate of glycolic acid was 12.3 mmol h−1. The reaction was not affected by a variation in the feed rate of water vapor in the range of 86 to 480 mmol h−1. The selectivity to glyoxylic acid remained unchanged at 74 mol% with an increase in the conversion of glycolic acid up to 70%; the highest yield of glyoxylic acid was 56.5 mol% at the conversion of 80%.
Synthetic Studies on Polypropionate-Derived 4-Pyrone-Containing Marine Natural Products
Authors: Yamamura Shosuke , Nishiyama Shigeru 
Published: June 2006

Abstract
Synthesis of 4-pyrone derivatives by employing the mild cyclization is described. The DMSO–(COCl)2 and Ph3P–CCl4 conditions were appeared to accommodate a synthetic potential as proton equivalents. This study established the absolute configurations, and provided revisions of formerly proposed structures of highly oxygenated propionate derived 4-pyrones, such as ilikonapyrone, peroniatriols I and II, and onchitriols I and II.
The Mechanisms of Photochemical Reactions of o-Sulfobenzoic Imides
Authors: Ono Isao , Sato Shohei , Fukuda Kiyoshi , Inayoshi Tomoko 
Published: June 2006

Abstract
The photochemical processes of N-propyl-o-sulfobenzoic imide to the amides were investigated in ethanol and monocyclic aromatics, such as benzene, anisole, toluene, polymethylbenzenes, and benzonitrile. It was clarified that although both the S1 and T1 states took part in those photochemical reactions, the mechanisms were different in ethanol and those aromatics. The mechanism in ethanol is thought to involve hydrogen-atom abstraction from ethanol by a diradical formed after the extrusion of sulfur dioxide. The mechanism in aromatics involved an energy transfer from the singlet excited aromatic molecules to the sulfobenzoic imide and the addition of the resulting diradicals to the partner aromatics. Although the sulfobenzoic imide sensitized to a triplet state by acetophenone in benzene resulted as well in the formation of the arylated benzamide, this process was minor in comparison with the process via the S1 state. This was attributed to the triplet multiplicity of the diradical. The reactions of the sulfobenzoic imide with p-xylene and mesitylene were less predominant than those with toluene and anisole, which was attributable to a steric effect of plural methyl groups on the ring. The fact that no formation of the arylated benzamides took place in the case of benzonitrile could be explained by a strong inductitive effect of a cyano group of benzonitrile.
Ab Initio Study of the Isomers: HNNSi, HSiNN, and HNSiN
Authors: Ornellas Fernando R , Iwata Suehiro 
Published: June 2006

Abstract
We report on new structural, energetics, and vibrational frequency data for three isomers on the potential energy surface [H, Si, N, N] calculated at the UHF, MP2, and CCSD(T)/6-311G(2d) levels of theory. Similarly to SiNN, conventional methods fail to predict a thermodynamic stability for the isomer HSiNN. However, at the CCSD(T) level, the species HSiNN was found to lie 13.63 kcal mol−1 lower in energy than HNNSi; the isomer HNSiN was located 47.62 kcal mol−1 above the global minimum. After including the zero-point energy corrections, the isomer HSiNN becomes almost isoenergetic with its dissociation products HSi and N2; its detection might be likely only at low temperatures.
Semiconductor Photocatalysis. Part 22. Visible-Light Induced Photoreduction of CO2 with CdS Nanocrystallites — Importance of the Morphology and Surface Structures Controlled through Solvation by N,N-Dimethylformamide
Authors: Yanagida Shozo , Kanemoto Masashi , Ishihara Ken-ichi , Wada Yuji , Sakata Takao , Mori Hirotaro 
Published: June 2006

Abstract
Carbon dioxide (CO2) is reduced to CO on hexagonal CdS nanocrystallites (mean diameter of 4 nm) prepared in N,N-dimethylformamide (DMF) under visible-light irradiation with a quantum yield of 0.098 at λ = 405 nm in the presence of TEA as an electron donor. Solvation of the surface of CdS nanocrystallites by DMF or a related amide molecules should control the crystalline growth and stabilize the favorable morphology with a size quantization-effect. The effect of Cd2+ or H2S on CO production and the emission behavior, and the effect of electron donors suggest an important role of the surface structures of CdS–DMF for photo-induced electron transfer to CO2. The scope and limitation of the photoreduction of CO2 with semiconductor nanoparticles are discussed.
Structures of Tetrakis(t-butylammonium) Diperoxotetramolybdate(4−) and -tungstate(4−)
Authors: Ozeki Tomoji , Yamase Toshihiro 
Published: June 2006

Abstract
Hydrogen-bonded columnar structures have been observed in tetrakis(t-butylammonium) diperoxotetramolybdate(4−) (1) and -tungstate(4−) (2). 1, [(CH3)3CNH3]4[Mo4O12(O2)2], crystallizes in the tetragonal space group with a = 16.312(2), c = 6.352(1) Å, V = 1690.2(5) Å3, Z = 2. 2, [(CH3)3CNH3]4[W4O12(O2)2], crystallizes in the tetragonal form, , with a = 16.488(3), c = 6.349(2) Å, V = 1725.9(9) Å3, Z = 2. In each crystal, four t-butylammonium cations bridge two [M4O12(O2)2]4− (M = Mo, W) anions through hydrogen bonds to terminal and bridging oxo-ligands to make a columnar structure along the c axis.
Structure and NMR Behavior of Cobalt(III) Polyamine Complexes of α,ω-Alkylenediamine-N,N,N′,N′-tetramethylenetetraphosphonate in Aqueous Solution
Authors: Ichikawa Tomohide , Sawada Kiyoshi 
Published: June 2006

Abstract
The complex formation of α,ω-diaminopolyphosphonates (ethylenediamine- [H8edtmp], trimethylenediamine- [H8tdtmp] and hexamethylenediamine-N,N,N′,N′-tetramethylenetetraphosphonate [H8hdtmp]) with cobalt(III) polyamine complexes has been investigated by means of 31P NMR spectroscopy. The formation and protonation constants of the complexes and the 31P NMR chemical shifts of each protonated species were determined from the pH dependence of the 31P NMR signals. In any complexes, the nitrogen atom of the ligand is not coordinated to CoIII. The complex cis-[CoCl(en)2(NH3)]2+ forms a mononuclear O-monodentate complex and two types of binuclear bis(O-monodentate) complexes by a reaction with edtmp and tdtmp, and forms a mononuclear O-monodentate complex and a dinuclear bis(O-monodentate) complex with hdtmp. The complex cis-[CoCl2(en)2]+ forms a mononuclear O-monodentate complex and a mononuclear O,O-bidentate complex having an eight-membered chelate ring with edtmp and tdtmp, and forms a mononuclear O,O-bidentate complex and dinuclear bis(O-monodentate) complexes with hdtmp. In the case of the edtmp complexes, two iminodiphosphonate groups interact with each other: 1) an interaction between the nitrogen atoms of two imino fragments by a hydrogen bond (NH+···N) in a monoprotonated species and 2) an intramolecular interaction between the protonated nitrogen atom and phosphonate O− of another imino group (NH+···−OP) in triprotonated and tetraprotonated species.
Synthesis, Structure, and Properties of 2,2-Bis(2-pyrimidinylthio)-4,4,6,6-tetrachlorocyclotri(λ5-phosphazene)s. Insight into Bonding Mode
Authors: Jung Ok-Sang , Kim Yong Tae , Lee Hyun , Kim Kwan Mook , Chae Hee Kwon , Sohn Youn Soo 
Published: June 2006

Abstract
The reaction of hexachlorocyclotri(λ5-phosphazene), N3P3Cl6, with a series of pyrimidine-2-thiol in the presence of triethylamine in boiling tetrahydrofuran solution affords only a geminal isomer, N3P3(N–S)2Cl4 (N–S = 2-pyrimidinylthio (pms), 4,6-dimethyl-2-pyrimidinylthio (dmpms), and trifluoromethyl-2-pyrimidinylthio (fmpms)) in high yield. The molecular structures of N3P3(pms)2Cl4 (monoclinic P21/n, a = 7.686(2), b = 28.236(7), c = 8.760(2) Å, β = 99.87(2)°, V = 1873.2(8) Å3, Z = 4, R = 0.052) and N3P3(dmpms)2Cl4 (triclinic , a = 8.698(3), b = 9.630(3), c = 14.179(6) Å, α = 100.88(3), β = 92.83(3), γ = 103.84(3)°, V = 1126.9(7) Å3, Z = 2, R = 0.049) have been solved. The crystal structures disclose that the nitrogen atom of the 2-pyrimidinylthiol group significantly interacts with the phosphorus atom of the cyclotri(phosphazene) ring within the sum of the van der Waals radii (3.40 Å). The P…N intramolecular interaction of N3P3(dmpms)2Cl4 (P(1)–N(5), 3.109(4); P(1)–N(7), 3.126(4) Å) is considerably longer than that of N3P3(pms)2Cl4 (2.965(7), 2.986(7) Å). Although such a unique intramolecular interaction does not seem to be exactly retained in solution, the steric effects of the geminal bis-substituted ligands seem to hinder further substitution at other untouched phosphorus atoms. The formation of only a geminal isomer and its structure seem to be involved in the mechanism of the substitution reaction.
An Important Role of the One-Electron Reduction Nitrosyl Coordinated to Ruthenium. A Redox-Induced Oxygen Atom Transfer Reaction between the Nitrosyl and Adjacent Nitrite Moieties of {RuNO}7-Type Nitrosyl Complex
Authors: Ooyama Dai , Nagao Hirotaka , Ito Kyoko , Nagao Noriharu , Howell F Scott , Mukaida Masao 
Published: June 2006

Abstract
A facile redox-induced nitrito-to-nitro isomerization occurs in cis-[Ru(NO)(ONO)(bpy)2]2+ ({RuNO}6-type nitrosyl, bpy = 2,2′-bipyridine). At room temperature, the one-electron reduction species (cis-[Ru(NO·)(ONO)(bpy)2]+({RuNO}7)) changes immediately to cis-[Ru(NO·)(NO2)(bpy)2]+ ({RuNO}7), which can be converted to cis-[Ru(NO)(NO2)(bpy)2]2+ ({RuNO}6) by one-electron oxidation. The nitro species is an isomeric twin of the original nitrito species. A mechanistic investigation has established that, during the nitrito–nitro redox-induced rearrangement, an oxygen-atom transfer reaction proceeded between the nitrosyl and the adjacent nitrite ligands. Such a behavior could not be found in the thermally-induced nitrito–nitro rearrangement of the {RuNO}6-type nitrosyl complex mentioned above. The {RuNO}7-type nitrosyl complex appears to behave as a key intermediate species of the oxygen-atom transfer reaction.
Preparation, Characterization, and X-Ray Crystal Structures of μ-2,6-Dimethylpyridine-α,α′-diyl Iridium(III)–Rhodium(III) Complexes and the Structure of [Rh2Cl4(μ-CH2-py-CH2)(PPh3)2](CH2-py-CH2 = 2,6-Dimethylpyridine-α,α′-diyl) Reinvestigated
Authors: Yamasaki Kazuyuki , Saito Hiroaki , Tadokoro Makoto , Matsumoto Keiji , Miyajima Seiichi , Nakamura Yukio 
Published: June 2006

Abstract
2,6-Bis(chloromethyl)pyridine was oxidatively added to [IrCl(PPh3)3] to give cis(P,P)-[IrCl2(ClCH2-py-CH2-C,N)(PPh3)2] (ClCH2-py-CH2 = {2-(6-chloromethyl)pyridyl}methyl) (1a), of which the cycloiridated structure has been established by an X-ray analysis. Complex 1a further reacts with [RhCl(PPh3)3] to afford an Ir(III)–Rh(III) complex [IrRhCl2(μ-Cl)2(μ-CH2-py-CH2-C,N,C′)(PPh3)3](CH2-py-CH2 = 2,6-dimethylpyridine-α,α′-diyl) (3). Upon prolonged heating in toluene, 3 liberates one triphenylphosphine ligand and [IrRhCl2(μ-Cl)2(μ-CH2-py-CH2-C,N,C′)(PPh3)2] (4) is formed. X-Ray crystal structure determinations of 3 and 4 have revealed their dinuclear structures, in which the metals are connected by two Cl atoms and a CH2-py-CH2 group acting, in 3, as a κC (for Ir) : κC,κN (for Rh)-bridging ligand, while, in 4, as a κC (for Rh) : κC,κN (for Ir)-bridging ligand. The structure of the corresponding Rh(III)–Rh(III) complex, [Rh2Cl4(μ-CH2-py-CH2)(PPh3)2] (6), which was incorrectly assigned based on its NMR spectral data alone [Bull. Chem. Soc.Jpn., 68, 183 (1995)], has been revised by an X-ray analysis to be analogous to that of 4. Pseudooctahedral geometries at the κC-bonded Rh(III) centers of 4 and 6 are completed by unusually close Rh···HC(aryl) contacts of 2.79 and 2.75 Å, respectively. Complex 4 is static but 3 as well as 6 are fluxional in haloalkane solvents. Such a solution behavior of 3 is discussed in the light of the solid structures of 3 and 4.
Magneto-Structural Correlations in Phenoxo-Bridged Copper(II) Compounds
Authors: Emori Shuji , Orimoto Kenichi , Ohtsuka Yasunobu 
Published: June 2006

Abstract
The magnetic susceptibilities of compounds [Cu(4-XPhO)2(L)] (4-XPhOH = phenol, 4-nitrophenol, 4-chlorophenol; L = 1,2-diaminoethane, N,N,N′,N′-tetramethylethylenediamine) and [Cu(salaz)(RCOO)] (Hsalaz = 8-(2-hydroxyphenyl)-1,5- diazabicyclo[3.2.1]octane; R = CH3–, C2H5–, (CH3)3C–) were determined over the temperature range of 77—300 K, and compared with those for salicylideneaminato-bridged compounds. The correlation between their structures and exchange-coupling strength were formulated to indicate that the exchange couplings for phenoxo-bridged copper(II) systems were affected not only by the p character of the hybrid orbitals on the bridging oxygen atom, but also by the electronic effects of the substituents on the aromatic ring.
Additive Effect of Palladium on the Catalytic Activity of In/TiO2–ZrO2 for the Selective Reduction of Nitrogen Monoxide in the Presence of Water Vapor
Authors: Haneda Masaaki , Kintaichi Yoshiaki , Inaba Megumu , Hamada Hideaki 
Published: June 2006

Abstract
The additive effect of noble metals (Pt, Pd, Rh, and Ir) on the catalytic activity of In/TiO2–ZrO2 for the selective reduction of NO with propene in the presence of water vapor was investigated. Although NO reduction activity of In/TiO2–ZrO2 was inhibited drastically by coexisting water vapor, the addition of palladium was capable of depressing the retarding effect. The presence of both indium and palladium was necessary for the enhancement of NO reduction activity, and this was accounted for by a synergistic effect between palladium and indium. Optimum indium and palladium loadings were at 2—5 wt% and 0.005 wt%, respectively. It is suggested that the NO reduction on Pd/In/TiO2–ZrO2 by propene proceeds via the following consecutive steps: the formation of oxygenated intermediates by the reaction of propene with oxygen on palladium, a spillover of the intermediates from palladium to indium and reaction between the intermediates and NO2 to form N2 on indium.
Activation of a Gold Electrode for the Oxidation of l-Ascorbic Acid. Adsorbed Substrate as a Catalyst
Authors: Ando Isao , Chofuku Hiroshi , Ujimoto Kikujiro , Kurihara Hirondo 
Published: June 2006

Abstract
The simple electrochemical activation of a gold electrode for the oxidation of l-ascorbic acid was examined. A polycrystalline gold electrode was activated for the oxidation of l-ascorbic acid by positive sweeps within a narrow potential range in a sample solution. The activation mechanism was investigated by voltammetry and in situ electrochemical STM. The activation is ascribed to the coordinative adsorption of l-ascorbic acid on the gold electrode, where it behaves as a catalyst for the oxidation of l-ascorbic acid in bulk.
A Convenient Synthesis of 1,2-Dihydro-1,2,4-triazolo[3,2-b]quinazolin-9(1H)-ones and Their 1,2,4-Triazolo Derivatives
Authors: El-Hiti Gamal Abdel-Rahman 
Published: June 2006

Abstract
A range of 1,2-dihydro-1,2,4-triazolo[3,2-b]quinazolin-9(1H)-ones (3) has been synthesized in very good yields by the reaction of 3-amino-2-anilino-4(3H)-quinazolinone (1) with aromatics aldehydes in the presence of excess piperidine as a base. The 1,2,4-triazolo[3,2-b]quinazolin-9(1H)-ones could be obtained in very good yields by dehydrogenation of compounds 3 with thionyl chloride. Reaction of 1 with active methylene compounds (diethyl malonate and acetylacetone) resulted in the production of condensed products. These condensed products could be cyclized to 1,2,4-triazolo[3,2-b]quinazolin-9(1H)-one by heating above the melting point. Acetylation of 1 by acetic anhydride was found to be dependent on the reaction conditions. The acetyl derivative 3-acetamido-2-anilino-4(3H)-quinazolinone formed under mild conditions, while dimerization took place under strong conditions to give a pentacyclic compound in very good yield.
Laser Flash Photolysis in High Speed Photopolymer Coating Layers. II: Sensitization Mechanisms of Aminochalcone-Type Dyes with a Radical-Generating Reagent
Authors: Itoh Hiroki , Takada Akiomi , Kudo Hideaki , Yokoyama Hideki , Senda Yasuhisa , Urano Toshiyuki , Nagasaka Hideki 
Published: June 2006

Abstract
The sensitization mechanisms of three aminochalcone-type dyes with a radical-generating reagent: (E)-3-(9-Julolidinyl)-1-phenyl-2-propen-1-one (A), (E)-2-(9-julolidinyl)methylene-1-indanone (B), and (E)-2-(9-julolidinyl)methylene-1-tetralone (C) with 2,4,6-tris(trichloromethyl)-1,3,5-triazine (TRI), in poly(methyl methacrylate) film have been investigated by laser flash photolysis using a total reflection cell. The fluorescences of the dyes were efficiently quenched by TRI with static quenching distances, (RS)S, of 1.5, 1.4, and 1.3 nm for A, B, and C, respectively. The observed static quenching distances of the initial triplet absorptions of the dyes, (RS)T, were similar to those of the fluorescences. The values of (RS)T for A, B, and C, are 1.6, 1.6, and 1.5 nm, respectively. The triplet decay times of the dyes were inefficiently quenched with the rate, (kq)T, less than 106 mol−1 dm3 s−1. The results suggested that a static singlet sensitization is predominant in the photoinitiation systems.