bluuebunny/crossref_metadata_2025_split huggingface dataset:
X-Ray Structural Analyses of Rare Earth Trifluoromethanesulfonate Complexes Bearing Urea Derivatives
Authors: Nishiura Masayoshi , Okano Naoko , Imamoto Tsuneo 
Published: November 2004

Abstract
X-Ray structural analyses of the rare earth(III) trifluoromethanesulfonates (triflates) with urea derivatives are described. The reactions of anhydrous rare earth triflates with 8 equiv of tetrahydro-2-pyrimidinone (trimethyleneurea (PU)) in methanol give [M(pu)8](OTf)3 (OTf = triflate) (M = Sm: 1a; M = Y: 1b; M = Nd: 1c; M = Eu: 1d; M = Gd: 1e; M = Tb: 1f; M = Dy: 1g; M = Ho: 1h; M = Yb: 1i), and [Sc(pu)6](OTf)3 (2). X-Ray crystallographic analyses of these complexes indicate that a pair of PU ligands are interacting with each other through the hydrogen bonds. The reaction of anhydrous samarium(III) triflate with 6 equiv of 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone (1,3-dimethyltrimethyleneurea (DMPU)) in tetrahydrofuran (THF) affords [Sm(dmpu)6](OTf)3 (3) which has a hexa-coordinated octahedral structure. Anhydrous samarium(III) triflate reacts with 5 equiv of 1,3-dimethyl-2-imidazolidinone (DMI) to give [Sm(Otf)2(dmi)5]OTf (4) which has a hepta-coordinated pentagonal bipyramidal structure. Five DMI ligands in 4 coordinate to the samarium atom in a propeller-like fashion.
Computational Studies on Chiral Discrimination Mechanism of Phenylcarbamate Derivatives of Cellulose
Authors: Yamamoto Chiyo , Yashima Eiji , Okamoto Yoshio 
Published: November 2004

Abstract
The calculations of interaction energies between cellulose tris(phenylcarbamate) (CTPC) or cellulose tris(3,5-dimethylphenylcarbamate) (CDMPC) and trans-stilbene oxide (1) or benzoin (2) were performed by various methods. The purpose was to gain insight into the mechanism for the chiral recognition on phenylcarbamate derivatives of cellulose which are useful chiral stationary phases for HPLC. The calculations were roughly divided into two methods: 1) Enantiomers were generated around the NH proton and the C=O oxygen of the carbamoyl group of CTPC and CDMPC which are considered to be the most important adsorption sites, and then the interaction energy was calculated. 2) Enantiomers were randomly generated by the Monte Carlo method on the surface of CTPC and CDMPC, and then the interaction energy was calculated. The results of both calculations were in good agreement with the results in the chromatographic resolution of 1 and 2 by CTPC and CDMPC.
Rotational Isomerization of (E)-(2-Anthryl)ethenes. A Consideration Why Are the s-cis Rotamers More Stable than the s-trans Rotamers in the Excited State and Less Stable in the Ground State?
Authors: Karatsu Takashi , Itoh Hajime , Yoshikawa Nobuko , Kitamura Akihide , Tokumaru Katsumi 
Published: November 2004

Abstract
Rotational isomerism between s-cis and s-trans rotamers of (E)-1-(2-anthryl)-2-phenylethene (E-2APE) and (E)-1-(2-anthryl)-3,3-dimethyl-1-butene (E-2ADB) were investigated by comparing the absorption, emission and transient absorption spectra with those of the model compounds. The s-trans isomer is more stable than the s-cis rotamer in the ground state; however, the s-cis isomer is more stable than the s-trans rotamer in the excited state (the lowest singlet and triplet excited state). In the triplet excited state, s–trans → s–cis one-way rotational isomerization is observed with activation energies of 30 and 18 kJ mol−1 for E-2APE and E-2ADB, respectively. Explanations of why the s-cis rotamer is more stable than the s-trans rotamer in the excited state and less stable in the ground state are proposed using the HOMO and LUMO coefficients estimated by a MOPAC93 (PM3) calculation.
Synthesis of 13C-Labeled Biosynthetic Precursor of Lipid A and Its Analogue with Shorter Acyl Chains
Authors: Oikawa Masato , Shintaku Tetsuya , Sekljic Harald , Fukase Koichi , Kusumoto Shoichi 
Published: November 2004

Abstract
The synthesis of regiospecifically 13C-labeled compounds of a biosynthetic precursor of lipid A and its analogue with shorter acyl chains is described. d-(6-13C)Glucose was converted into a suitably protected glucosamine derivative via 1,6-anhydro-β-d-(6-13C)glucose. After coupling with glycosyl donors, the desired compounds were synthesized through a 6-step reaction sequence. The total yields were 1.7% for the biosynthetic precursor, and 6.4% for the short acyl analogue, respectively, for a total of 18 steps from d-(6-13C)glucose.
Preparation of Primary Amines by the Alkylation of O-Sulfonyloximes of Benzophenone Derivatives with Grignard Reagents
Authors: Tsutsui Hironori , Ichikawa Tomoko , Narasaka Koichi 
Published: November 2004

Abstract
Primary amines are prepared by the electrophilic amination of Grignard reagents with benzophenone O-sulfonyloxime derivatives. 4,4′-Bis(trifluoromethyl)benzophenone O-sulfonyloximes react with alkyl Grignard reagents in the presence of a catalytic amount of CuCN in tetrahydrofuran-hexamethylphosphoric triamide to give N-alkylimines, which are readily hydrolyzed to primary amines. 3,3′,5,5′-Tetrakis(trifluoromethyl)benzophenone O-p-tolylsulfonyloxime is arylated to the corresponding N-arylimines with aryl Grignard reagents in ether–toluene, and hydrolysis of the resulting imines gives aniline derivatives.
Effects of Substitution of Hydrophobic Amino Acids by Tryptophan on Receptor Binding and Biological Activity of Neuropeptide Nociceptin
Authors: Okada Kazushi , Sujaku Tetsujo , Nakashima Rie , Nose Takeru , Yamada Yoshinari , Yokoyama Masayuki , Nagahisa Atushi , Shimohigashi Yasuyuki 
Published: November 2004

Abstract
Nociceptin is a neuropeptide that binds to and activates the opioid receptor-like ORL1 receptor. In order to explore the structural elements necessary for receptor recognition and activation, we designed and synthesized a series of nociceptin analogues, in which nonpolar amino acid residues such as Gly6, Ala7, Ala11, Leu14, and Ala15were substituted respectively by Trp. [Trp6]- and [Trp7]nociceptins exhibited rather weak activities (5—15% of nociceptin), and [Trp11]- and [Trp15]nociceptins also showed reduced activities (40—50%). These results suggested that the space available for these particular residues are relatively restricted. By contrast, the Trp/Leu-substitution at position 14 retained full receptor binding activity, and the resulting [Trp14]nociceptin exhibited an increased biological activity in the functional assay using [35S]GTPγS. This suggested that the receptor residue interacting with nociceptin-Leu14 is the aromatic amino acid.
Asymmetric Hydroformylation of Olefins in Highly Crosslinked Polymer Matrixes
Authors: Nozaki Kyoko , Shibahara Fumitoshi , Itoi Yohei , Shirakawa Eiji , Ohta Tetsuo , Takaya Hidemasa , Hiyama Tamejiro 
Published: November 2004

Abstract
When polymer-immobilized chiral phosphine-phosphite–Rh(I) complexes were used, the asymmetric hydroformylation of styrene gave 2- and 3-phenylpropanals with a substrate/catalyst ratio of 2000, iso/normal ratios of 84/16 to 89/11, and 89% R enantiomeric excess of 2-phenylpropanal; these results were at the highest level in catalytic activity, regio-, and enantioselectivities. Recovery-reuse of the catalyst was examined. Asymmetric hydroformylation of vinyl acetate, (Z)-2-butene, and 3,3,3-trifluoropropene was also successfully performed with the polymer-supported catalysts.
Carbonylation of Formaldehyde with Carbon Monoxide over Cation-Exchange Resin Catalysts
Authors: Wang Zheng Bao , Shimada Takashi , Takagi Hiroyuki , Ahn Cheol-Hee , Sano Tsuneji , Soga Kazuo , Takahashi Ikuo , Masuda Takashi 
Published: November 2004

Abstract
The carbonylation of formaldehyde with carbon monoxide was carried out over two kinds of cation-exchange resins as solid acid catalysts. Effects of reaction conditions on the catalytic performance were studied. From 1H NMR, 13C NMR, IR, and GC-MS analyses of the products obtained, it was found that 1,3-dioxolan-4-one (1,3-DOX-4) is selectively produced over the cation-exchange resins. The carbonylation of formaldehyde with carbon monoxide over the cation-exchange resins proceeds under milder reaction conditions, as compared with HZSM-5 zeolite.
Synthesis and Characterization of a Novel Green Photoluminescent Silicon-Containing Poly(p-phenylenevinylene)
Authors: Chen Zhi-Kuan , Wang Lian-Hui , Kang En-Tang , Lai Yee-Hing , Huang Wei 
Published: November 2004

Abstract
A novel solution processable photoluminescent polymer containing silyl groups has been successfully synthesized through a polycondensation reaction. The polymer was characterized through FT-IR, NMR, UV-vis spectroscopy, photoluminescent spectroscopy (PL), elemental analysis and cyclic voltammetry (CV). A TGA analysis shows that the polymer is stable up to 300 °C both in air and in nitrogen. The UV-vis absorption spectra for both the solution and film samples are very similar. The band gap obtained from the optical spectra is 2.53 eV. The maximum emissions of photoluminescence are at 494 and 507 nm for the solution and film samples, respectively. The UV-vis spectrum of its polymer film also shows a very small temperature dependence. A cyclic voltammogram illustrates that the polymer can be reversibly n-doped and dedoped in a negative sweep and irreversibly p-doped during a positive sweep. All of the results demonstrate that the obtained polymer is a promising green-light emission material for PLED applications.
Preparation and Properties of a New Hard Material of Composition C3N3.6-4.5O1.1-1.2H4.1-4.2
Authors: Kawaguchi Masayuki , Tokimatsu Yasuyo , Nozaki Koji , Kaburagi Yutaka , Hishiyama Yoshihiro 
Published: November 2004

Abstract
A new material of composition C3N3.6–4.5O1.1–1.2H4.1–4.2, which is harder than a quartz glass plate and shows ferromagnetism at room temperature, has been prepared by the reaction of C3N3Cl3 with Li3N at 220 °C.
Generation, Characterization and Some Reactions of 1,1-Ethylene-1H-azulenium Ion
Authors: Oda Mitsunori , Kajioka Takanori , Okujima Tetsuo , Itoh Shunji , Morita Noboru , Miyatake Ryuta , Kuroda Shigeyasu 
Published: November 2004

Abstract
The title carbocation, generated from 1,1-ethylene-1,6-dihydroazulene and trityl tetrafluoroborate in deuterated acetonitrile at −20 °C, was characterized by means of low temperature NMR spectroscopy, and was found to undergo expansion of the cyclopropane ring at elevated temperature and to react with nucleophiles to give the addition products at the cyclopropane methylene carbon.
Crystal Structure and Electrical Conducting Properties of [BEDT-BDTBT]3[ReO4]2, an Organic Conductor Based on a Novel Benzo[c]thiophene-Extended Donor
Authors: Ise Toshihiro , Mori Takehiko , Takahashi Kazuko 
Published: November 2004

Abstract
Conducting behavior and X-ray crystal structure of ReO4 salt of a new benzo[c]thiophene-extended donor have been investigated, revealing that the packing mode as well as the donor to anion ratio varies distinctly by changing the central hetero atom.
Novel Concurrent Formation of Mo–Si and Si–C Bonds by the Reaction between [MoH4(Ph2PCH2CH2PPh2)2] and PhSiH3
Authors: Zhou Da-Yang , Minato Makoto , Ito Takashi , Yamasaki Mikio 
Published: November 2004

Abstract
Reaction of [MoH4(Ph2PCH2CH2PPh2)2] with PhSiH3 in refluxing toluene yielded doubly chelated novel complexes with the Si–C–C–P–Mo framework as a result of the oxidative addition involving Si–H bond cleavage concurrent with the selective activation of the ortho C–H bonds of the dppe ligands.
Synthesis, Extraction and Enrichment of Dy Endohedral Fullerenes
Authors: Takabayashi Yasuhiro , Kubozono Yoshihiro , Hiraoka Koji , Inoue Takashi , Mimura Kazue , Maeda Hironobu , Kashino Setsuo 
Published: November 2004

Abstract
The Dy endohedral C60 (Dy@C60) was extracted with aniline under ultrasonic irradiation from the soot prepared by arc-heating of Dy2O3/graphite composite rod under He pressure of 80 Torr. The purification of Dy@C60 was performed by using high performance liquid chromatography (HPLC) technique. Furthermore, the Dy endohedral C82 (Dy@C82) was effectively extracted from the soot with N,N-dimethylformamide (DMF).
Fluorescence Properties of BDD Molecules Doped in Si-Ti Binary Oxide Systems by the Sol-Gel Method
Authors: Zhang Jinlong , Yamashita Hiromi , Anpo Masakazu 
Published: November 2004

Abstract
The characteristics of the fluorescence spectra of 2,5-bis(4-diethyl-aminophenyl)-1,3,4-oxadiazole(BDD) doped in Si-Ti binary oxides by the sol-gel method were investigated as a function of time in its transitions from sol to gel to xerogel. The characteristic BDD excimer fluorescence was observed during the transition from gel to xerogel only in a mixture of TEOS and TPOT but not in pure TEOS, indicating that the presence of a tetrahedrally coordinated titanium ion species plays a significant role in the formation of the excimer.
Ultrafast Photoluminescence Dynamics in a Quasi-one-dimentional Halogen-bridged Mixed-valence Complex [Pt(en)2][Pt(en)2Cl2](ClO4)4
Authors: Kobayashi Takayoshi , Sekikawa Taro , Yamashita Masahiro 
Published: November 2004

Abstract
Ultrafast dynamics of luminescence from the unrelaxed self-trapped excitons in a quasi-one-dimensional halogen-bridged mixed-valence complex [Pt(en)2][Pt(en)2Cl2](ClO4)4 (en = ethylenediamine) has been investigated for the first time by femtosecond up-conversion method. The photoluminescence lifetime increases from 270 fs to 1.2 ps with wavelength from 570 nm to 660 nm. At longer wavelengths than 660 nm a component with a much longer lifetime than 10 ps was also observed.
Differences between Spontaneous Assemblage and Concentration-Induced Assemblage of Peptide-Containing Molecules in Organic Media
Authors: Yamada Norihiro , Matsubara Kazuhiro , Koyama Emiko , Fujioka Maki 
Published: November 2004

Abstract
Assemblages of tripeptide-containing molecules in organic media were divided into the self-assemblage which was formed at a low concentration and the concentration-induced assemblage which was unstable upon heating.
A Highly Diastereoselective Synthesis of α-Substituted-β-hydroxy Compounds from Corresponding β-Stannyl Compounds
Authors: Yamamoto Makoto , Itoh Kiyoshi , Kishikawa Keiki , Kohmoto Shigeo 
Published: November 2004

Abstract
Anti-β-stannyl-α-substituted carbonyl compounds were completely converted to its syn-analogues, and each diastereomer was oxidized to its β-hydroxylated analogues with retention of the stereochemistry.
Novel Copolyamides Containing [60]Fullerene in the Main Chain
Authors: Li Jing , Yoshizawa Toshiyuki , Ikuta Mari , Ozawa Masaki , Nakahara Kentaro , Hasegawa Tetsuya , Kitazawa Koichi , Hayashi Minoru , Kinbara Kazushi , Nohara Masao , Saigo Kazuhiko 
Published: November 2004

Abstract
Novel copolymers, poly(1,4-oxybisphenylene fullerenobisacetamide-co-1,4-oxybisphenylene isophthalamide)s, which contained [60]fullerene in the main chain, were synthesized by the direct copolycondensation of a mixture of [60]fullerenobisacetic acid and isophthalic acid with 4,4′-diaminodiphenyl ether in the presence of triphenylphosphite and pyridine. Light scattering measurements for the copolymers showed a weight-average molecular weight Mw of about 5-6 × 104. The UV-visible spectra of the copolymers exhibited the characteristics of the parent fullerene derivative. The absorption edge red-shifted from 370 nm for poly(1,4-oxybisphenylene isophthalamide) to about 700 nm for the copolymers.
Stability of Amino Acids in Simulated Hydrothermal Vent Environments
Authors: Kohara Masanori , Gamo Toshitaka , Yanagawa Hiroshi , Kobayashi Kensei 
Published: November 2004

Abstract
Stability and reactions of amino acids in submarine hydrothermal vent environments were examined. The decomposition rate was much slower in high hydrogen fugacity environments like the submarine hydrothermal vent systems than in usual laboratory conditions.
First Observation of Photosensitized Luminescence of Nd3+ in Organic Solution
Authors: Iwamuro Mitsunori , Hasegawa Yasuchika , Wada Yuji , Murakoshi Kei , Kitamura Takayuki , Nakashima Nobuaki , Yamanaka Tatsuhiko , Yanagida Shozo 
Published: November 2004

Abstract
Photosensitized luminescence of Nd3+ in solution was successfully observed for the first time by coordinating the metal cation with deuterated 4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-pentadecafluoro-1-pentafluorophenyl-1,3-decanedione as a ligand with a low vibrational chromophore.
A Novel Fluorogenic Substrate for Horseradish Peroxidase: Efficient Detection of Membrane-Bound Nucleic Acids and Simultaneous Detection of DNAs
Authors: Fujita Satoshi , Toru Takeshi , Kondoh Yasumitu , Kagiyama Naoto , Momiyama Masayoshi 
Published: November 2004

Abstract
Aniline derivatives were found to be trasformed to fluorescent compounds on treatment with horseradish peroxidase/H2O2. DNA was detectable with high resolution in the horseradish peroxidase-linked immunosobent fluorescence assay of the membrane-bound DNA using one of the aniline derivatives. A new method for a simultaneous detection of two different DNA sequences was also achieved.
Design and Characterization of Polymer Matrix Anchored to Gold Thin Layer for the Effective Usage of Evanescent Field in SPR-based Immunosensor
Authors: Toyama Shigeru , Ikariyama Yoshihito 
Published: November 2004

Abstract
A remarkably stable antigen immobilization on gold thin layer deposited on a glass using aminoethanethiol and oxidized dextran hydrosulfate matrix is reported. The polymer was thus covalently bound onto the gold thin layer, and human serum albumin (HSA) as an antigen was covalently bound on the polymer matrix. The association and the dissociation of anti-HSA (aHSA) with the bound HSA were repeatedly observed by surface plasmon resonance (SPR) measurement. The SPR signal vs. concentration of aHSA has a good experimental agreement with the Langmuir adsorption isotherm equation of the aHSA binding with HSA.
Synthesis and Diastereoselective Structural Change of a Photochromic Transition Metal Complex, (η6-Spirobenzopyran)(tricarbonyl)chromium
Authors: Miyashita Akira , Iwamoto Atsushi , Kuwayama Tomoya , Shitara Hiroaki , Aoki Yoshio , Hirano Masafumi , Nohira Hiroyuki 
Published: November 2004

Abstract
Photochromic transition metal complexes, (η6-spirobenzopyran)Cr(CO)3, were synthesized and the structure was determined by an X-ray crystallographic and 1H NMR measurements. The ring formation during its synthesis and ring-closing reaction during and after UV irradiation proceeded diastereselectively to let chromium atom and oxygen atom of the pyran ring locate on the same side of the indoline ring.
An Efficient Method for Catalytic and Stereoselective Synthesis of 2-Deoxy-α-d-glucopyranosides from 3,4,6,-Tri-O-benzyl-2-deoxy-d-glucopyranose and Several Alcoholic Nucleophiles
Authors: Takeuchi Kazuya , Higuchi Satoshi , Mukaiyama Teruaki 
Published: November 2004

Abstract
Several 2-deoxy-α-d-glucopyranosides are stereoselectively synthesized in high yields by glycosylation of various alcoholic nucleophiles with 3,4,6-tri-O-benzyl-2-deoxy-glucopyranose using a catalytic amount of trityl tetrakis(pentafluorophenyl)borate.
A New Class of Bridged Diiron(III) Complex with a Schiff-base Bridge: Structure and Magnetic Properties of Di-N,N′-trimethylene bissalicylidenimine(bis-N-N′-trimethylenebissalicylideniminato)iron(III)
Authors: Babu N K Chandra , Nair Balachandran Unni , Ramasami T , Yamasaki Mikio , Shibahara Takashi 
Published: November 2004

Abstract
Schiff base, salprn has been shown to bridge two Fe(III) ions and give rise to a diiron(III) complexes with practically no magnetic coupling between the two iron(III) centres.
Mutual Diffusion Coefficients for Zwitterionic and Ionic Mixed Micellar Systems: A Novel Concentration Dependence
Authors: Tominaga Toshihiro , Nakamura Tomoyo , Saiki Hiroyasu 
Published: November 2004

Abstract
Mutual diffusion coefficients, Dm, have been measured for aqueous solutions containing N-tetradecyl-N,N-dimethyl-3-ammonio-1-propanesulfonate (C14DAPS) and sodium octadecane sulfonate (C18SO3Na) at 298.2 K. For a fixed concentration of C14DAPS, Dm values increase with increasing amounts of C18SO3Na. For a fixed ratio of C18SO3Na to C14DAPS, Dm values do not increase with total surfactant concentration. This is in marked contrast with the results obtained for one-component ionic micellar systems.
Formation of Molecularly Ordered Domain of 1-Decanethiol in the Mixed Self-Assembled Monolayer with Bis(4-pyridyl)disulfide - A Scanning Tunneling Microscopy Observation
Authors: Sato Yukari , Yamada Ryo , Mizutani Fumio , Uosaki Kohei 
Published: November 2004

Abstract
Scanning tunneling microscopy (STM) of self-assembled monolayers (SAMs) on Au(111) prepared from mixtures of bis(4-pyridyl) disulfide and 1-decanethiol revealed that patched domains of each organosulfur compound were formed.
Photoreduction of Carbon Dioxide with Methane over ZrO2
Authors: Kohno Yoshiumi , tanaka Tsunehiro , Funabiki Takuzo , Yoshida Satohiro 
Published: November 2004

Abstract
Over zirconium oxide, carbon dioxide is reduced to carbon monoxide selectively by methane at room temperature under photoirradiation. From temperature programmed desorption experiments, this reaction is expected to proceed via stable surface intermediates. The carbon atom of evolved CO derives from carbon dioxide only.
Facile Fabrication Procedure for C60-Doped Silicon Oxide Thin Films
Authors: Hasegawa Isao , Shibusa Koji , Kobayashi Satoshi , Nonomura Shuichi , Nitta Shoji 
Published: November 2004

Abstract
C60-doped silicon oxide thin films can be prepared easily by sol-gel processing using a mixture of phenyltriethoxysilane and tetraethoxysilane as the silicon oxide sources. Preparation of C60-dissolved single-phase starting solutions is practicable by employing phenyltriethoxysilane which acts as a solubilization agent of C60 as well as the silicon oxide source.
An ESR Study of γ-Irradiated P4VP Polymers : Dose-Effect Relationships
Authors: Draye M , Favre-Réguillon A , Foos J , Guy A 
Published: November 2004

Abstract
The behavior of poly(vinylpyridine) with a gamma ray source has been studied. In the present work, samples were irradiated in air with a 60Co or 137Cs gamma cell source (absorbed dose 10 Gy to 14400 kGy). All tested samples show well defined ESR signals whose amplitude increases with time. The behavior at room temperature and dose–effect relationships were investigated.
A New Synthetic Method for Poly(arylene)s Using Bis(pinacolato)diboron as a Condensation Reagent
Authors: Izumi Atsushi , Nomura Ryoji , Masuda Toshio 
Published: November 2004

Abstract
We have developed a new convenient synthetic method for poly(arylene)s via dehalogenative coupling of dihaloarenes using bis(pinacolato)diboron as a condensation reagent. With this method, a variety of dihaloarenes including dihalobenzenes, dihaloazobenzenes, and dihalothiophenes were polymerized to give the corresponding poly(arylene)s.
pH-Dependent Water Structure at a Quartz Surface Modified with an Amino-Terminated Monolayer Studied by Sum Frequency Generation (SFG)
Authors: Ye Shen , Nihonyanagi Satoshi , Uosaki Kohei 
Published: November 2004

Abstract
The structures of water at the interfaces between a fused quartz surface modified by a self-assembled monolayer (SAM) of an amino-terminated silane molecule and electrolyte solutions of various pHs were investigated using sum frequency generation (SFG) vibrational spectroscopy. The structure of the interfacial water significantly depended on the solution pH. The effect of the electric double layer generated by the protonation of the amino groups in the SAM and unreacted silanol groups on the quartz substrate is considered to be responsible for the pH-dependence.
Chirality Effects on Energy Transfer from Polypyridyl Ru(II) to Os(II) Complexes in Langmuir-Blodgett Films
Authors: Okamoto Kentaro , Takahashi Masayuki , Taniguchi Masahiro , Yamagishi Akihiko 
Published: November 2004

Abstract
Energy transfer rate (k2) from optically active tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) (denoted by Ru(II)) to Os(II) has been studied in Langmuir–Blodgett (LB) films; k2 is found to be larger for Λ-Ru(II)/Δ-Os(II) than for Λ-Ru(II)/Δ-Os(II) in a Y-type mixed film of Ru(II) and Os(II), while streoselectivity is reversed in an alternatively layered Y-type LB film of Ru(II) and Os(II).