1,4,5,8-Tetraazaphenanthrene has been synthesized photochemically from dilute benzene solution of 1,2-bispyrazyl ethylene in the presence of oxygen as an oxidant.
The structure of this compound has been elucidated by nmr, IR, UV-VIS, and mass spectrometry as well as elements analysis.
The photocyclization yield of 1,2-bispyrazyl ethylene was about 90%, and quantum yield was $5.1×10^{-2}$.
Salt effect, solvent effect, quenching study, and triplet sensitizer effect on the photocyclization of 1,2-bispyrazyl ethylene and 2-styryl pyrazine have been studied.
It is concluded from these studies that the reactive state of photocyclization is $(N,\pi^{\ast})^1$ state.
1,4,5,8-tetraazaphenanthrene 을 1,2-bispyrazyl ethylene으로 부터 광화학적인 방법으로 합성하였고 u.v-vis, IR, NMR, mass Spectrometry 와 원소분석을 이용하여 그구조를 확인하였다.
1,2-bispyrazyl ethylene 으로 부터 1,4,5,8-tetraaza-phenanthrene 의 광화학적 합성 수득률은 약 90%나 되었으며 양자 수득률은 $5.1 × 10^{-2}$ 이었다. 1,2-bispyrazyl ethylene과 2-Styryl pyrazine 의 광고리화 반응이 어떤 mechanism으로 이루어지는지 알아보기 위해 양자수득률을 측정, triplet sensitizer quencher, 산, alkaline salt, 용매의 극성이 1,2-bispyrazyl ethylene 과 2-styryl pyrazine 의 광고리화 반응에 미치는 영향등을 연구하여 $(N,\pi^{\ast})^1$ 상태에서 이들의 광고리화 반응이 일어남을 알았다.
