The synthesis, characterization and optical properties of novel 1,3,4-oxadiazole-containing imidazo[1,5-a]pyridine derivatives

2011 ◽  
Vol 131 (5) ◽  
pp. 1070-1076 ◽  
Author(s):  
Yan Qing Ge ◽  
Ben Qian Hao ◽  
Gui Yun Duan ◽  
Jian Wu Wang
Keyword(s):  
Optical Properties ◽  
Pyridine Derivatives

scholarly journals Optical properties, spectral narrowing of photoluminescence and blue electroluminescence of poly(phenylene pyridine) derivatives

2000 ◽  
Vol 77 (5) ◽  
pp. 660-662 ◽  
Author(s):  
A. Fujii ◽  
R. Ootake ◽  
T. Fujisawa ◽  
M. Ozaki ◽  
Y. Ohmori ◽  
...  
Keyword(s):  
Optical Properties ◽  
Pyridine Derivatives ◽  
Spectral Narrowing

Synthesis, crystal structure, optical properties and antibacterial evaluation of novel imidazo[1, 5-a]pyridine derivatives bearing a hydrazone moiety

Luminescence ◽  
2013 ◽  
Vol 29 (3) ◽  
pp. 293-300 ◽  
Author(s):  
Yan Qing Ge ◽  
Fu Rong Li ◽  
Yu Juan Zhang ◽  
Yu Shui Bi ◽  
Xiao Qun Cao ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Pyridine Derivatives ◽  
Antibacterial Evaluation

Synthesis of 5-cyanopyrazolo[1,5-a]pyridine derivatives via tandem reaction and their optical properties

2015 ◽  
Vol 56 (2) ◽  
pp. 425-429 ◽  
Author(s):  
Bin Wang ◽  
Fan Su ◽  
Jiong Jia ◽  
Fan Wu ◽  
Shu-Yao Zhang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Tandem Reaction ◽  
Pyridine Derivatives

Synthesis and Optical Properties of some Novel Bis-1,3,4-Oxadiazoles

2015 ◽  
Vol 1104 ◽  
pp. 131-135
Author(s):  
Hua Liu ◽  
Lin Lu ◽  
Dun Jia Wang
Keyword(s):  
Optical Properties ◽  
Fluorescence Spectra ◽  
Fluorescence Emission ◽  
Chloroform Solution ◽  
Emission Spectra ◽  
Pyridine Derivatives ◽  
Fluorescence Emission Spectra ◽  
H Nmr ◽  
Uv Illumination ◽  
Oxadiazole Derivatives

Three 2,6-bis (1,3,4-oxadiazol-2-yl) pyridine derivatives were synthesized and their structures were conformed by1H NMR, FTIR, MS techniques and elemental analysis. The UV–Vis absorption and fluorescence emission spectra of these compounds were investigated in chloroform solution. The results showed that these bis-1,3,4-oxadiazole derivatives had broad and strong absorption at 278−302 nm in the UV–Vis spectra and exhibited fluorescence emission at 338 −367 nm under UV illumination in fluorescence spectra. It was found that the nature of the substituents at benzene ring in bis-1,3,4-oxadiazole derivatives had a significant impact on their photoluminescence behaviors.

One pot synthesis, X-ray crystal structure of 2-(2′-hydroxyphenyl)oxazolo[4,5-b]pyridine derivatives and studies of their optical properties

2018 ◽  
Vol 1157 ◽  
pp. 119-126 ◽  
Author(s):  
Horacio Briseño-Ortega ◽  
Lizbeth Juárez-Guerra ◽  
Susana Rojas-Lima ◽  
Luis Humberto Mendoza-Huizar ◽  
Rosa A. Vázquez-García ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Pyridine Derivatives ◽  
One Pot ◽  
X Ray ◽  
One Pot Synthesis

ChemInform Abstract: Synthesis of 5-Cyanopyrazolo[1,5-a]pyridine Derivatives via Tandem Reaction and Their Optical Properties.

ChemInform ◽  
2015 ◽  
Vol 46 (22) ◽  
pp. no-no
Author(s):  
Bin Wang ◽  
Fan Su ◽  
Jiong Jia ◽  
Fan Wu ◽  
Shu-Yao Zhang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Tandem Reaction ◽  
Pyridine Derivatives

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.

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).

Differential polarization imaging of sickled cells

1988 ◽  
Vol 46 ◽  
pp. 62-63
Author(s):  
Marcos F. Maestre
Keyword(s):  
Optical Properties ◽  
Theoretical Approach ◽  
Polarized Light ◽  
Polarization Microscopy ◽  
Spectroscopic Techniques ◽  
Polarization Imaging ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Microscopic Scale ◽  
Chiral Structures

Recently we have developed a form of polarization microscopy that forms images using optical properties that have previously been limited to macroscopic samples. This has given us a new window into the distribution of structure on a microscopic scale. We have coined the name differential polarization microscopy to identify the images obtained that are due to certain polarization dependent effects. Differential polarization microscopy has its origins in various spectroscopic techniques that have been used to study longer range structures in solution as well as solids. The differential scattering of circularly polarized light has been shown to be dependent on the long range chiral order, both theoretically and experimentally. The same theoretical approach was used to show that images due to differential scattering of circularly polarized light will give images dependent on chiral structures. With large helices (greater than the wavelength of light) the pitch and radius of the helix could be measured directly from these images.

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