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3 results on '"Kolev, Tsonko"'

1. 2-Amino-4-nitroaniline, a known compound with unexpected properties

Author

Kolev, Tsonko, Koleva, Bojidarka B., Spiteller, Michael, Mayer-Figge, Heike, and Sheldrick, William S.

Subjects
Crystallization -- Observations, Aniline -- Research, Aniline -- Chemical properties, X-rays -- Diffraction, X-rays -- Usage, Chemicals, plastics and rubber industries
Abstract

2-Amino-4-nitroaniline crystallizes in a noncentrosymmetric space group giving it significant potential for second-order nonlinear optical properties (NLO) in the bulk. The theoretically predicted NLO properties at the molecular level are confirmed using various methods like X-ray diffraction, conventional and polarized IR spectroscopy, thermal and elemental analysis.

Published
2007

2. On the origin of the color in the solid state. Crystal structure and optical and magnetic properties of 4-cyanopyridinium hydrogensquarate monohydrate

Author

Koleva, Bojidarka B., Kolev, Tsonko, Seidel, Rudiger W., Mayer-Figge, Heike, Spiteller, Michael, and Sheldrick, William S.

Subjects
Charge transfer -- Analysis, Pyridinium compounds -- Structure, Pyridinium compounds -- Magnetic properties, Pyridinium compounds -- Optical properties, Crystals -- Structure, Crystals -- Analysis, X-rays -- Diffraction, X-rays -- Usage, Chemicals, plastics and rubber industries
Abstract

The crystal structure and optical and magnetic properties of the newly synthesized 4-cyanopyridinium hydrogensquarate monohydrate are analyzed by using single-crystal X-ray diffraction and other spectroscopic methods. The unusual red color of the compound in the solid state is shown to be due to a strong bathochromic shift of the charge transfer band within the stable layers formed by the (2HSq.2[H.sub.2]O) fragments.

Published
2008

3. 2-Amino-4-nitroaniline, a known compound with unexpected properties

Author

Kolev, Tsonko, Koleva, Bojidarka B., Spiteller, Michael, Mayer-Figge, Heike, and Sheldrick, William S.

Subjects
Aniline -- Structure, Aniline -- Optical properties, Aniline -- Spectra, Infrared spectroscopy -- Analysis, X-rays -- Diffraction, X-rays -- Analysis, Chemicals, plastics and rubber industries
Abstract

2-Amino-4-nitroaniline crystallizes in a noncentrosymmetric space group giving it significant potential for second-order nonlinear optical properties (NLO) in the bulk. The theoretically predicted NLO properties at the molecular level are confirmed using various methods like X-ray diffraction, conventional and polarized IR spectroscopy, thermal and elemental analysis.

Published
2007

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