窒素酸化物とチール基のペア
Zhuang Wu1, Changyun Chen1, Jie Liu1
1College of Chemistry, Chemical Engineering and Materials Science , Soochow University , Suzhou 215123 , China.
Journal of the American Chemical Society
|February 14, 2019
まとめ
研究者は,S-ニトロソチオール (RSNO) 分解から,難解なケージラジカルペアを特定しました. 赤光照射はこれらの基質ペアからRSNOをリフォームし,酸化窒素の放出機構の洞察を明らかにしました.
科学分野:
- 化学物理学
- 写真化学
- 生物物理化学
背景:
- S-ニトロシオール (RSNO) は,窒素酸化物 (NO) の源として機能する重要な生物学的分子です.
- RSNOにおけるS-N結合の容易な同解分裂は,NOの放出を促進する.
- RSNO分解の中間種を理解することは,NOシグナル伝達経路の解明に不可欠です.
研究 の 目的:
- S-ニトロシオール (RSNO) の低温での光分解を調査する.
- RSNO光分解で形成される難解なケージラジカルペアを特定し,特徴づけること.
- 逆転可能な形成と解離を 探求すること
主な方法:
- Ne,Ar,N2マトリクスを用いた冷凍温度 (<10K) のマトリックス分離スペクトロスコーピー (IRとUV/vis).
- 紫外線と可視光によるプロトタイプのRSNO (R=MeとEt) の光分解
- 分離エネルギーを決定する計算式化学計算 (CASPT2).
主要な成果:
- O··SとH··Nの相互作用によって安定した窒素酸化物 (NO•) とチールラジカル (RS•) を含むケージラジカルペアの識別
- 赤光照射によるケージラジカルペアの消失の観察.
- 赤い光に曝露したときに,ケージのラジカルペアから元のRSNOのリフォーム.
- 4. 7 kcal mol−1 でメチル基対 (MeS···ON) の解離エネルギー計算
結論:
- この研究は,RSNO光分解で一時的なケージラジカルペアを成功裏に特定した.
- 赤光照射は,リバーシブルな光化学的過程を示唆する,過激なペアからRSNOをリフォームするための経路を提供します.
- これらの発見は,S-ニトロシオールから窒素酸化物の放出のメカニズムについて重要な洞察を提供します.
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