객체 분자에 의한 트리메틸아민 하이드레이트의 구조 변이 분석 연구
Guest-dependent Structural Transition of Trimethylamine Hydrate
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초록
이 연구에서는 객체 분자의 종류에 따라 발생한 트리메틸아민(TMA) 하이드레이트의 구조변이에 대한 결과 를 확인하였다. X선 회절분석을 통해 얻은 (TMA + H2) 하이드레이트의패턴은 육방정계 P6/mmm 하이드레이트 형성 을 나타냈으며, (TMA + CH4) 하이드레이트의 패턴은 입방정계 Fd3m 하이드레이트의 형성을 나타냈다. 가스가 포집 되지 않은 TMA 하이드레이트의 경우 육방정계의 구조를 나타내기 때문에, 메탄가스의 포집은 TMA 하이드레이트 의 구조 변이 혹은 준안정한 입방정계 구조의 형성을 의미한다고 볼 수 있다.이가능성을 확실하게 검증하기 위해 시 간에 따라 (TMA + CH4) 하이드레이트를 형성하여 X선 회절분석을 실시하였으며, 메탄가스의 포집에 따라 TMA 하 이드레이트는 육방정계로부터 입방정계로 구조 변이가 발생함을 확인하였다.
Abstract
This paper reports the structural transition of trimethylamine (TMA) hydrate induced bya type of guest molecule. Powder X-ray diffraction patterns of (TMA + H2) hydrates reveal the formation of hexagonal P6/mmm hydrate, but those of (TMA + CH4) hydratesindicate the formation of cubic Fd3m hydrate. Without the gaseous guest molecule, the crystal structure of pure TMA hydrate is identified as hexagonal P6/mmm. Therefore, inclusion of gaseous methane in TMA hydrate can induce a structural transition from hexagonal to cubic hydrate or the formation of a metastable cubic hydrate. To further clarify this possibility, we also check the time-dependent structural patterns of binary (TMA + CH4) hydrates for 1 - 14 days. The results show that the structural transitionof TMA hydrate from hexagonal P6/mmm to cubic Fd3m can occur during the methane inclusion process.
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