scholarly journals Synthesis and optical properties of poly(N-octyl-m-benzamide)s bearing an oligothiophene chromophore on the benzene ring

2016 ◽  
Vol 48 (5) ◽  
pp. 605-610 ◽  
Author(s):  
Koji Takagi ◽  
Yuma Nishikawa ◽  
Kana Shimizu ◽  
Ryohei Yamakado ◽  
Shinri Sugimoto ◽  
...  
Keyword(s):  
Optical Properties ◽  
Benzene Ring

2-[(E)-2-(3-Hydroxy-4-methoxyphenyl)ethenyl]-1-methylquinolinium 4-chlorobenzenesulfonate

2006 ◽  
Vol 62 (5) ◽  
pp. o1802-o1804 ◽  
Author(s):  
Suchada Chantrapromma ◽  
Boonwasana Jindawong ◽  
Hoong-Kun Fun ◽  
P. S. Patil ◽  
Chatchanok Karalai
Keyword(s):  
Optical Properties ◽  
Benzene Ring ◽  
Title Compound ◽  
Dihedral Angles ◽  
Compound C ◽  
Non Linear ◽  
Linear Optical Properties ◽  
The Mean ◽  
Linear Optical ◽  
A Chain

The title compound, C19H18NO2 +·C6H4ClO3S−, exhibits non-linear optical properties. The cation is almost planar and the benzene ring of the anion makes dihedral angles of 48.97 (6) and 51.63 (7)° with the mean planes through the quinolinium system and the benzene ring of the cation, respectively. The anions are linked by C—H...O interactions, forming a chain along the a axis, while the cations are stacked along the a axis. The anionic chains and the cationic stacks are alternately arranged.

Optical characteristics of injection-molded fluorene polymers

2013 ◽  
Vol 33 (6) ◽  
pp. 557-563 ◽  
Author(s):  
Mariko Kato ◽  
Hiroshi Ito
Keyword(s):  
Optical Properties ◽  
Temperature Dependence ◽  
Benzene Ring ◽  
Flow Characteristics ◽  
High Refractive Index ◽  
Digital Cameras ◽  
Optical Retardation ◽  
Injection Molded ◽  
The Difference ◽  
Aspheric Lenses

Abstract Digital cameras are small, but they must be able to take images with numerous pixels. To use few lenses in devices, aspheric lenses have been used. Fluorene-based polymers (FBPs) have a high refractive index and low birefringence. Because optical lenses must be manufactured as designed with low optical retardation, FBP optical lenses are widely used. This study assessed optical and flow characteristics of polycarbonate (PC) and two kinds of FBP. Molded specimen characteristics of PC and two FBPs revealed these properties of the FBPs. The results show that the unique structure of FBPs eliminated birefringence, because of the cardo structure part, including the fluorene ring. Differences in optical properties are attributable to structural differences of the part which is polymerized with the fluorene structure (the X part). The temperature dependence of FBPs in the flow characteristics and optical properties was smaller than that of PC; the slight temperature dependence is particularly obvious above the glass transition temperature (Tg). The benzene ring content of FBP affects the resin optical and physical properties. The influence of the difference between the fluorene polyester structure and the PC structure was greater than that of the benzene ring content in the X part, in the molecular structure of FBP.

scholarly journals Electron-electron interactions, topological phase, and optical properties of a charged artificial benzene ring

2015 ◽  
Vol 92 (24) ◽  
Author(s):  
Isil Ozfidan ◽  
Milos Vladisavljevic ◽  
Marek Korkusinski ◽  
Pawel Hawrylak
Keyword(s):  
Optical Properties ◽  
Benzene Ring ◽  
Topological Phase ◽  
Electron Interactions

Conjugated push-pull salts derived from linear benzobisthiazole: preparation and optical properties

2013 ◽  
Vol 67 (1) ◽  
Author(s):  
Alexandra Čibová ◽  
Peter Magdolen ◽  
Andrea Fülöpová ◽  
Pavol Zahradník
Keyword(s):  
Optical Properties ◽  
Benzene Ring ◽  
Quantum Chemical ◽  
Optical Materials ◽  
Chemical Structure ◽  
Non Linear ◽  
Linear Optical Properties ◽  
Linear Optical ◽  
New Compounds ◽  
Semi Empirical

AbstractA series of novel monomethylated salts derived from linear benzobisthiazole was prepared. The push-pull attributes of these new compounds are represented by a quaternised azolium cycle as the acceptor part at one end of the structure and the dialkylamino- or diarylamino-substituted benzene ring as the donor part at the opposite end. Both moieties are connected by a conjugated linker consisting of one or two double bonds. Such dipolar structures are promising candidates for non-linear optical materials. The quantum-chemical indices describing linear and non-linear optical properties were obtained from semi-empirical calculations. The relationships between the chemical structure and non-linear optical properties of the cations studied were obtained. Effective conjugation was confirmed by measuring the optical properties in the UV-VIS region.

scholarly journals Ultrafast broadband nonlinear optical properties and excited-state dynamics of two bis-chalcone derivatives

RSC Advances ◽  
2020 ◽  
Vol 10 (26) ◽  
pp. 15199-15205
Author(s):  
Lei Shen ◽  
Zhongguo Li ◽  
Xingzhi Wu ◽  
Wenfa Zhou ◽  
Junyi Yang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Excited State ◽  
Benzene Ring ◽  
Absorption Spectra ◽  
Nonlinear Optical ◽  
Excited State Absorption ◽  
Nonlinear Optical Properties ◽  
Excited State Dynamics ◽  
Chalcone Derivatives

The introduction of a benzene ring largely affects the excited-state absorption spectra and dynamics of these chromophores.

scholarly journals Investigation of Optical Properties for N and F Doped Triangular Shaped Carbon Molecules 

2021 ◽  
Author(s):  
Shuhong Xu ◽  
Linfeng Tan ◽  
Fan Liu ◽  
Yiping Cui ◽  
Chunlei Wang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Hydrogen Atom ◽  
Benzene Ring ◽  
Absorption Spectra ◽  
Optical Rotation ◽  
Carbon Doping ◽  
Pure Carbon ◽  
N Doping ◽  
Carbon Molecules ◽  
Carbon Molecule

Abstract Optical properties of N and F doping triangular shaped carbon molecules have been investigated in theory and experiment. The theoretical results showed that carbon molecules with impurity F and Cl have the same characters with pure carbon. Doping N into pure carbon molecule would change the optical rotation at 589nm. For doping N replacing hydrogen atom structures (N-doping 1 and N-doping 2 molecules), the absorption spectra of them are similar to pure carbon molecule. However, for molecules with impurity N atom in benzene ring (N-doping 3 and N-doping 4 molecules), the peaks of wavelength of absorption spectra shift to long wavelength compared to that of pure carbon molecule. Moreover, the delocalization of molecular orbital (MO) is different from pure carbon molecule, which is caused by the impurity N changing the electrons distribution of benzene ring. We have calculated 3 without H and 4 without H molecules which are removing hydrogen atom in nitrogen atom from N-doping 3 and 4. 3 without H and 4 without H molecules have similar optical properties with pure carbon molecule. The results testified that the impurity N and F would not change the optical properties of carbon molecule if impurity did not change the delocalization of all benzene rings.

Design of objective lens for 200-kV high-resolution electron microscopes

1983 ◽  
Vol 41 ◽  
pp. 314-315
Author(s):  
K. Tsuno ◽  
T. Honda ◽  
Y. Harada ◽  
M. Naruse
Keyword(s):  
Optical Properties ◽  
Computer Technology ◽  
Axial Magnetic Field ◽  
Chromatic Aberration ◽  
Objective Lens ◽  
Resolution Electron ◽  
Correction Of Astigmatism ◽  
Three Stages ◽  
Electron Microscopes ◽  
Stage 1

Developement of computer technology provides much improvements on electron microscopy, such as simulation of images, reconstruction of images and automatic controll of microscopes (auto-focussing and auto-correction of astigmatism) and design of electron microscope lenses by using a finite element method (FEM). In this investigation, procedures for simulating the optical properties of objective lenses of HREM and the characteristics of the new lens for HREM at 200 kV are described.The process for designing the objective lens is divided into three stages. Stage 1 is the process for estimating the optical properties of the lens. Firstly, calculation by FEM is made for simulating the axial magnetic field distributions Bzc of the lens. Secondly, electron ray trajectory is numerically calculated by using Bzc. And lastly, using Bzc and ray trajectory, spherical and chromatic aberration coefficients Cs and Cc are numerically calculated. Above calculations are repeated by changing the shape of lens until! to find an optimum aberration coefficients.

Electron Microscopic and Isozyme Study of a Case of Ochronosis

1972 ◽  
Vol 30 ◽  
pp. 88-89
Author(s):  
Jay W. Cha ◽  
Perry J. Melnick
Keyword(s):  
Benzene Ring ◽  
Enzyme System ◽  
Homogentisic Acid ◽  
Degenerative Changes ◽  
Acid Oxidase ◽  
Electron Microscopic ◽  
Tyrosine Metabolism ◽  
Collagenous Tissues

Hereditary ochronosis in very few cases has been examined electron microscopically or histochemically. In this disease homogentisic acid, a normal intermediary of tyrosine metabolism, forms in excessive amounts. This is believed to be due to absence or defective activity of homogentisic acid oxidase, an enzyme system necessary to break the benzene ring and to further break it down to fumaric and acetoacetic acids. Ochronotic pigment, a polymerized form of homogentisic acid, deposits mainly in mesenchymal tissues. There has been a question whether the pigment originates from the collagenous tissues, or deposits passively, where in contrast to melanin it induces degenerative changes.

Optical Properties of HVEM Accelerators

1975 ◽  
Vol 33 ◽  
pp. 180-181
Author(s):  
A. Strojnik ◽  
J.W. Scholl ◽  
V. Bevc
Keyword(s):  
Optical Properties ◽  
Electron Accelerator ◽  
Systematic Investigation ◽  
Electron Source ◽  
High Brightness ◽  
The Past ◽  
Wide Range ◽  
Optical Behavior

The electron accelerator, as inserted between the electron source (injector) and the imaging column of the HVEM, is usually a strong lens and should be optimized in order to ensure high brightness over a wide range of accelerating voltages and illuminating conditions. This is especially true in the case of the STEM where the brightness directly determines the highest resolution attainable. In the past, the optical behavior of accelerators was usually determined for a particular configuration. During the development of the accelerator for the Arizona 1 MEV STEM, systematic investigation was made of the major optical properties for a variety of electrode configurations, number of stages N, accelerating voltages, 1 and 10 MEV, and a range of injection voltages ϕ0 = 1, 3, 10, 30, 100, 300 kV).

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