Fluorescence Anisotropy and Rotational Diffusion of Two Kinds of 4-n-alkyl-4’-cyanobiphenyls in Glycerol
スポンサーリンク
概要
- 論文の詳細を見る
Absorption and fluorescence spectra, fluorescence lifetimes, and steady-state and time-resolved fluorescence anisotropies were measured for 4-methyl-4’-cynanobiphenyl (1CB) and 4-hexyl-4’-cynanobiphenyl (6CB) in glycerol at various temperatures. The energies and intensities of the absorption and emission spectra for 1CB and 6CB were almost equally observed, and the fluorescence lifetimes around 1.0 ns were also almost equally obtained and did not depend on temperature. However, the time-resolved fluorescence anisotropies measured in glycerol solution indicated that the molecules of 1CB rotate more rapidly than those of 6CB: the rigid-sphere radii for 1CB and 6CB obtained by using the pulsed exciting light were evaluated as 1.3×10-10 m (1CB) and 1.8×10-10 m (6CB) in the low temperature region (2-10°C), whereas those evaluated in the high temperature regions (20-60°C for 1CB and 30-60 for 6CB) were 2.7×10-10 m (1CB) and 3.6×10-10 m (6CB). These radii evaluated in the high temperature region were in good agreement with those obtained by using steady-state exciting light, 2.9×10-10 m (1CB) and 3.4×10-10 m (6CB). It is noted that the increase of radius was observed across an intermediate temperature region (10-30°C for 1CB or 10-40°C for 6CB), and was more remarkable for 6CB than for 1CB. This implies that the movements of hexyl-chain are much more enhanced at high temperature, and are effectively reflected to the increase in radius of rotational diffusion. The changing phenomenon of movements of peripheral alkyl-chain in liquid-crystal molecules is important for the phase transition between liquid crystal and isotropic liquid phases: the changing to less vigorous movements of the alkyl-chain in 6CB is thought enough to contribute to the liquid-crystal formation of 6CB molecule.
- 日本油化学会の論文
著者
-
Iwahashi Makio
Department Of Chemistry Kitasato University
-
Matsuzawa Hideyo
Department Of Chemistry School Of Science Kitasato University
-
Watanabe Kentaro
Department Of Respirology (res) Fukuoka University Lung Transplantation Protocol
-
Watanabe Kentaro
Department Of Chemistry Graduate School Of Science Hiroshima University
-
Watanabe Kentaro
Department Of Basic Science Graduate School Of Arts And Sciences The University Of Tokyo
関連論文
- Neutrino Mass and End-Point Energy of ^3H β-Decay
- Preparation of Low-Energy Reference Electron Source with ^Yb : Nuclear Science, Plasmas and Electric Discharges
- Two-dimensional Thermodynamic Properties of Sterols
- LTC-3 Possible right single lung transplantation for a bronchiectasis patient with a prior left lower lobectomy : Is performing a completion pneumonectomy in advance for a potential transplant candidate ethically acceptable?(Lung Transplant Conference)
- Extended Operation for T4 Lung Carcinoma
- Epithelial-mesenchymal transition in human lungs with usual interstitial pneumonia : Quantitative immunohistochemistry
- Brewer's yeast cell wall affects microbiota composition and decreases Bacteroides fragilis populations in an anaerobic gut intestinal model(BREWING AND FOOD TECHNOLOGY)
- Thermodynamic Properties of Steroids: 5-cholesten-3β-ol, 5α-cholestan-3β-ol, and 5β-cholestan-3α-ol
- Fluorescence Anisotropy and Rotational Diffusion of Two Kinds of 4-n-alkyl-4’-cyanobiphenyls in Glycerol
- Comparison of Hydrogen Bonding for Chiral and Racemic 1-Monostearoylglycerols in Solvent
- Phase Diagram for Binary Mixture of Sterols: 5-cholesten-3β-ol, 5α-cholestan-3β-ol, 5β-cholestan-3α-ol and 5β-cholestan-3β-ol
- Synthesis of a New Tridentate Anthracene Ligand Bearing (i-Pr9_2P Group at 1,8-Positions: Facile Bond Switch on Tetracoordinate Boron Atom
- Transient Spectra and Photoreaction of 4-Methoxybenzoyloxyl Radical
- Liver Abscess and Aeromonas Bacteremia with Septic Pulmonary Embolism
- Development of Novel System Combining Scanning Tunneling Microscope-Based Cathodoluminescence and Electroluminescence Nanospectroscopies
- Temperature Dependence of Structure and Dynamic Properties of Oleic Acid γand α Phases Studied by FTIR Spectroscopy
- Relationship between diabetic retinopathy and vascular endothelial function in elderly type 2 diabetic Japanese patients without cardiovascular disease
- Profile measurement of a wide-area resist surface using a multi-ball cantilever system
- Hydrogen Generation Using a Photoinduced Electron-transport System with a Molecular Catalyst in Vesicles
- Elevated Serum Uric Acid in Patients with Severe Obstructive Sleep Apnea-Hypopnea Syndrome
- Nocturia in Male Patients with Obstructive Sleep Apnea : Efficacy of Medication for Benign Prostatic Hypertrophy
- Spectra and Mean Association Number of Porphyrin J Aggregate
- Local Optical Characterization Related to Si Cluster Concentration in GaAs Using Scanning Tunneling Microscope Cathodoluminescence Spectroscopy
- Identifying risk factors for refractory febrile neutropenia in patients with lung cancer
- The clinical efficacy and safety of a fluoroquinolone-containing regimen for pulmonary MAC disease
- First reported case of hemoglobin lansing in Asia detected by false low oxygen saturation on pulse oximetry
- Spectra and Mean Association Number of Porphyrin J Aggregate
- The clinical efficacy and safety of micafungin-itraconazole combination therapy in patients with pulmonary aspergilloma
- A method for preparing a large sized, uniform and stable built-up film of 109Cd icosanoate as a radioactive source by utilization of an extremely small amount of substrate solution.
- A new apparatus for surface pressure measurements.
- Hopping phenomena of [1-14C]octadecanoic acid molecules at the surface of the Langmuir-Blodgett film regarded as an extremely thin crystal.
- Dynamical structures of normal alkanes, alcohols, and fatty acids in the liquid state as determined by viscosity, self-diffusion coefficient, infrared spectra, and 13C NMR spin-lattice relaxation time measurements.
- The dynamical structure of normal alcohols in their liquids as determined by the viscosity and self-diffusion measurements.
- The meaning of the equilibrium spreading pressure of fatty acid being relatively soluble in an underlying subphase.
- Radiotracer Studies on Adsorption of Surface Active Substance at Aqueous Surface. IV. Direct Measurement of Adsorption of Tritiated Nonionic Surfactant
- Radiotracer Studies on Adsorption of Surface Active Substance at Aqueous Surface. V. Effects of Additives on the Adsorption of Tritiated Nonionic Surfactant