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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
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Green colorants based on energetic azole borates
Johann Glück1, Thomas M Klapötke, Magdalena Rusan
1Department of Chemistry, Ludwig-Maximilian University of Munich, Butenandtstrasse 5-13 (D), 81377 Munich (Germany), Fax: +(49) 89-2180 77492.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 7, 2014
Summary
Green-burning boron compounds offer a safer alternative to barium nitrate in pyrotechnics. These novel, metal-free salts were synthesized and tested in various formulations, showing promising results for eco-friendly green colorants.
Area of Science:
- Pyrotechnic chemistry
- Inorganic synthesis
- Materials science
Background:
- Barium nitrate is a common pyrotechnic colorant but poses health and environmental risks.
- There is a need for safer, greener alternatives to traditional colorants in pyrotechnic formulations.
Purpose of the Study:
- To synthesize and characterize novel metal-free, nitrogen-rich boron-based compounds.
- To evaluate these compounds as green colorants in pyrotechnic compositions.
- To investigate the thermal, energetic, and colorimetric properties of the developed pyrotechnic formulations.
Main Methods:
- Synthesis of dihydrobis(5-aminotetrazolyl)borate and dihydrobis(1,3,4-triazolyl)borate salts.
- Characterization using NMR spectroscopy, elemental analysis, mass spectrometry, and vibrational spectroscopy.
- Testing of pyrotechnic compositions containing the azolyl borate salts with ammonium dinitramide/nitrate oxidizers and boron/magnesium fuels.
Main Results:
- Successful synthesis and characterization of novel boron-based compounds.
- Demonstrated potential of these compounds as green colorants in pyrotechnic formulations.
- Measured properties include burn time, dominant wavelength, spectral purity, luminous intensity, luminous efficiency, and thermal/energetic characteristics.
Conclusions:
- Metal-free, nitrogen-rich azolyl borate salts are viable alternatives to barium nitrate for green pyrotechnic colorants.
- The synthesized compounds exhibit favorable thermal and energetic properties for pyrotechnic applications.
- Further research into these boron-based compounds can lead to safer and more environmentally friendly pyrotechnic technologies.
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