Free radical scavenger capacity of 1,2,5-trihydroxyanthraquinone and 1,2,5-trihydroxythioxanthone: a theoretical comparative study

S. Jeremic, M. S. Pirkovic, Jelena Đorović Jovanović, Z. Marković
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Abstract

In this contribution are estimated and compared free radical scavenger capacity of 1,2,5- trihydroxyanthraquinone (AN) and 1,2,5-trihydroxythioxanthone (TX). For this purpose, $\mathbf{M06}-\mathbf{2X/6}-311++\mathbf{G}(\mathbf{d, p})$ method is used. Scavenger capacities of both molecules are determined in benzene and water. It is found that both antioxidants generate stable radicals in water following SPLET mechanism. On the other hand, the most plausible mechanism for that purpose in benzene is HAT. In the presence of three selected free radicals $(\mathbf{HO}^{\bullet},\mathbf{HOO}^{\bullet}\mathbf{and}\ \mathbf{CH_{3}OO}^{\bullet})$ these molecules manifest their scavenger capacity following HAT and SPLET competitively in both estimated environment conditions. The reactivity of observed molecules toward free radicals decreases following the order: $\mathbf{HO}^{\bullet}\gg\mathbf{HOO}^{\bullet}>\mathbf{CH_{3}OO}^{\bullet}$. Comparing thermodynamic parameters that describe homolytic O-H cleavage for estimated antioxidants, it is concluded that TX shows somewhat higher scavenger capacity.
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1,2,5-三羟基蒽醌与1,2,5-三羟基硫氧蒽酮自由基清除能力的理论比较研究
在此贡献估计和比较了1,2,5-三羟基蒽醌(AN)和1,2,5-三羟基硫氧蒽酮(TX)的自由基清除能力。为此,使用$\mathbf{M06}-\mathbf{2X/6}-311++\mathbf{G}(\mathbf{d, p})$方法。这两种分子在苯和水中的清除能力是确定的。研究发现,这两种抗氧化剂均通过SPLET机制在水中产生稳定的自由基。另一方面,在苯中达到这个目的的最合理的机制是HAT。在三个选定的自由基$(\mathbf{HO}^{\bullet},\mathbf{HOO}^{\bullet}\mathbf{和}\ \mathbf{CH_{3}OO}^{\bullet})$的存在下,这些分子在HAT和SPLET两种估计的环境条件下竞争性地表现出它们的清除能力。观察到的分子对自由基的反应活性依次递减:$\mathbf{HO}^{\bullet}\gg\mathbf{HOO}^{\bullet}>\mathbf{CH_{3}OO}^{\bullet}$。比较了描述氧化氢均裂的热力学参数,得出了TX具有较高的清除能力的结论。
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