Chemically reversible reactions of hydrogen sulfide with metal phthalocyanines.

Chemically reversible reactions of hydrogen sulfide with metal phthalocyanines.
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DOI:
10.1021/ic500664c
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发表时间:
2014-08-04
影响因子:
4.6
通讯作者:
Pluth MD
Pluth MD
中科院分区:
化学2区
文献类型:
--
作者:
Hartle MD;Sommer SK;Dietrich SR;Pluth MD

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硫化氢(H2S)是一种重要的信号分子,可作用于多种生物无机靶点。尽管这一点很重要,但很少有研究调查了生理上相关的H2S和HS -质子化态与金属配合物的差异反应性。在这里,我们报道了H2S和HS -与锌(II)和钴(II)酞菁(Pc)配合物的不同反应性,并强调了每种金属的化学可逆性和可循环性。ZnPc与HS -反应生成[ZnPc- sh]−,而不与H2S反应生成[ZnPc- sh]−,后者可通过质子化转化回ZnPc。CoPc与HS -反应,而不是与H2S反应,生成[CoIPc]−,可被空气再氧化为CoPc。综上所述,这些结果证明了HS -与金属酞菁配合物的化学可逆反应,并强调了H2S质子化状态对于理解H2S与生物相关金属支架的反应性特征的重要性。H2S的质子化状态影响其与不同金属酞菁配合物的反应性。ZnPc和CoPc与H2S均发生化学可逆反应,不氧化还原的ZnPc与HS -结合,而具有氧化还原活性的CoPc则进行还原。产物[ZnPc- sh]−可以通过质子化还原为ZnPc, [CoIPc]−可以在空气中氧化为CoPc。
Hydrogen sulfide (H2S) is an important signaling molecule that exerts action on various bioinorganic targets. Despite this importance, few studies have investigated the differential reactivity of the physiologically relevant H2S and HS– protonation states with metal complexes. Here we report the distinct reactivity of H2S and HS– with zinc(II) and cobalt(II) phthalocyanine (Pc) complexes and highlight the chemical reversibility and cyclability of each metal. ZnPc reacts with HS–, but not H2S, to generate [ZnPc-SH]−, which can be converted back to ZnPc by protonation. CoPc reacts with HS–, but not H2S, to form [CoIPc]−, which can be reoxidized to CoPc by air. Taken together, these results demonstrate the chemically reversible reaction of HS– with metal phthalocyanine complexes and highlight the importance of H2S protonation state in understanding the reactivity profile of H2S with biologically relevant metal scaffolds. The protonation state of H2S influences its reactivity with different metal phthalocyanine (Pc) complexes. Both ZnPc and CoPc react with H2S in a chemically reversible manner, with redox-inactive ZnPc binding HS− and redox-active CoPc undergoing reduction. The [ZnPc-SH]− product can be reverted to ZnPc by protonation, and [CoIPc]− can be redoxidized to CoPc with air.
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