硫二氧化物三重组国家有低氧气火率常数
Steffen Jockusch1, Elif Ozcelik Kazancioglu2, Nurcan Karaca2
1Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403, United States.
三重激发状态通常被氧气灭. 某些硫-9-one-10,10-二氧化物衍生物显示了降低的火率和高的单一氧气产量,支持现有模型.
科学领域:
- 摄影化学的使用.
- 有机化学 有机化学
- 物理化学 物理化学
背景情况:
- 有机分子的三重激发状态 (M) 通常被基态分子氧 (O) 灭,X-g) 具有高速率常数 (k) 10 9 M-1 s-1).
- 这种火可以使单元氧 (O2(a1Δg)) 的产生变得敏感,如果三元状态能量超过94kJ/mol.
- 火的效率和单点氧的产量受混合与分子氧电荷转移状态的影响.
研究的目的:
- 为了研究硫-9-one-10,10-二氧化物衍生物的三倍激发状态.
- 为了确定这些化合物的火速常数 (kq) 和单点氧量子产量.
- 探索分子特性和氧气火动态之间的关系.
主要方法:
- 硫-9-one-10,10-二氧化物衍生物的合成.
- 用分子氧测量三重状态火速常数 (kq) 的方法.
- 对于光敏感单片氧生产的量子产量的确定.
- 测量研究分子的氧化潜力.
主要成果:
- 几种硫-9-one-10,10-二氧化物衍生物表现出异常低的kq值 (低至1 × 108 M-1 s-1).
- 这些化合物实现了单片氧 (O2) 生产的近单位量子产量.
- 这些分子显示出高氧化潜力 (约为3.5V与SCE).
结论:
- 兴奋的三重体状态-氧气碰撞复合体中减少的电荷转移特征被提出来解释低的kq.
- 这种减少的电荷转移允许高效的单点氧气产生.
- 这些发现为有机分子激发状态被氧火的理论模型提供了实验验证.
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