• Journal of the Korean Society of Propulsion Engineers
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• v.25 no.6
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• pp.66-73
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• 2021

The development of excellent high-energy materials has progressed in the direction of synthesizing compounds with high nitrogen content, ultimately oriented toward the form of polynitrogen. As cyclo-N₅^-, a type of polynitrogen, is synthesized as sodium pentazolate(NaN₅) and the results of various metal and non-metal compounds have been studied, the usage of polynitrogen compounds is attracting attention. However, since the known synthesis and purification method of NaN₅ are very extreme and complicated, it is essential to improve the process in order to increase the utility of the pentazolate compounds in the future. In this study, only a simple filtration method was applied to purify the NaN₅, and based on this, two non-metal pentazolate salt compounds were successfully synthesized.

• Journal of the Korea Institute of Military Science and Technology
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• v.19 no.3
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• pp.319-329
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• 2016

Current research trends of prediction of possible structures, synthesis and explosive characteristics of polynitrogen molecules(PNs) are reviewed. Theoretically PNs are composed only of nitrogen atoms, in which N-N bonds are either single or double bonds, and thus when these molecules decompose, release of enormous energy is accompanied. From the middle of 20th century energetic material chemists have been seeking possible structures and the methods of synthesis of these new materials. As a results, from $N_4$ to $N_{60}$ together with their ions are predicted, and experimental chemists have been trying to synthesize these materials with a few success, including the famous ${N_5}^+$ ion in 1999. Although experimental successes are very rare beyond $N_5$ until today, the author believes that renovative ideas together with sincere efforts will bring someday next generation of high energy materials such as nitrogen fullerene($N_{60}$) in reality.

• Journal of the Korea Institute of Military Science and Technology
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• v.6 no.3
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• pp.86-102
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• 2003

Polynitrogen molecules are of great interest as potential high energy-density materials, and hence such structures of various isomers of nitrogen clusters have been calculated using molecular modeling techniques by the researchers from various sectors of scientific institutions. In this article, the predicted meta-stable structures of these hypothetical molecules have been thoroughly reviewed.

• Proceeding of EDISON Challenge
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• 2015.03a
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• pp.147-150
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• 2015

Polynitrogen Compounds (PNC)는 질소만으로 이루어진 물질을 칭하며, 주로 질소간의 단일 결합과 이중결합으로 이루어져 있다. 질소 간 단일결합에너지 38.4kcal/mole에 비해 유난히 큰 229kcal/mole의 삼중결합 에너지 덕택에 PNC는 고에너지 물질로 큰 각광을 받고 있다. PNC는 합성과정이 큰 흡열반응으로 실험이 까다로워 이론적인 연구가 많이 진행되어왔다. 그 중에서 고리형태의 $N_5{^-}$가 안정할 것으로 예측되며, 실험적으로도 발견되었다. $N_5{^-}$를 안정화시키기 위해 많은 연구가 진행되었으며 그 중 하나가 금속과의 결합을 통한 화합물의 안정화이다. 본 연구에서는 $N_5{^-}$와 Cyclopentadienyl($C_5H_5{^-}$)이 전자구조나 기하학적 구조가 매우 유사함에 착안하여 이미 상대적으로 많은 합성이 보고되어 있는 $M(C_5H_5)_3$, $M(C_5H_5)_4$의 전이금속 M구조에 대하여 아직 발견되지 않은 $M(N_5)_3$, $M(N_5)_4$ 화합물의 구조와 열역학적 안정성을 알아보도록 한다. 본 연구에서 찾아진 $Zr(C_5H_5)_4$은 현재까지 실험적으로 보고된 $M(C_7H_7)(C_5H_5)$ 클러스터 구조에 비해 질소함유량이 약 67% 더 높다.