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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 33, Number 1
JKCSEZ 33(1)
February 20, 1989 

 
Title
A Study on the Physical Properties of Compound of Pyrazine with Cromium Trioxide

Pyrazine 의 CrO3 화합물의 물성에 관한 연구
Author
Jung Sung Yang

양정성
Keywords
Abstract
피라지니움염인 피라지니움 크로로크로메이트와 디피라지니움 트리크로로메이트는 HCl용액과 CH2Cl2용액에 피라진을 각각 녹이고 거기에 CrO3를 가하므로 얻었다. 이들 화합물은 모두 비흡수성이나 물에 잘 녹었다. 이들 화합물의 물리적 특성으로 용해도, pH, 전기전도도, 용융점 등을 측정하였다. 이들 화합물은 전기 전도도 측정으로 C4H4N2H+, CrO3Cl-, Cr3O102- 이온 등으로 용액 내에 존재하는 것을 알 수 있었다. 또한 DTA에 의해 염의 첫번째 분해시에 CrO3가 분리되고 두번째 분해시에는 Cr2O3로 변해지고 이때 무게가 감소됨을 알 수 있었다. 특히 동일한 조건하에서 디피라지니움 염은 피리딘으로부터 얻어진 Cr2O72- 의 형태로 존재하리라 예측했던 것이 이소폴리의 형태로 존재함을 알 수 있었다.

Pyrazinium chlorochromate and dipyrazinium trichromate which are pyrazinium salts were prepared by the each reaction of pyrazine with chromium trioxide under the presence of HCl and CH2Cl2. These compounds wese nonhygroscopic and were solved in water very well. Physical properties such as solubility, pH, electrical conductivity, and melting point were measured. These compounds were considered to be ionic ; C4H4N2H+, CrO3Cl-, Cr3O102- by the measurement of electrical conductivity. It was found that CrO3 was formed in the first decomposition process of salts and it was changed into Cr2O3 in the second process as its weight is decreased. It was also found that especially under the same condition dipyrazinium salt was in the form of isopoly (Cr2O102-)anion which has been thought to be in the form of Cr2O72- obtained from pyridine.

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