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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >IR Spectroscopic Methods for the Investigation of the CO Release from CORMs
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IR Spectroscopic Methods for the Investigation of the CO Release from CORMs

机译:红外光谱法研究CORM中CO的释放

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Carbon monoxide (CO) is a toxic gas for mammals, and despite this fact, it is naturally produced in these organisms and has been proven to be beneficial in medical treatments, too. Therefore, CO-releasing molecules (CORMs) are intensively developed to administer and dose CO for physiological applications. Nearly all of these compounds are metal carbonyl complexes, which have been synthesized and investigated. However, for most of these CORMs, the exact reaction mechanisms of CO release is not completely elucidated, although it is of utmost importance. The widely used myoglobin assay for testing the CO release has several disadvantages, and therefore, different methods have to be applied to characterize CORMs. In this work, different setups of IR absorption spectroscopy are used to analyze and quantify the CO release during the decay of various CORMs: IR spectroscopy of the gas phase is applied to follow the CO liberation, and attenuated total reflection (ATR) IR spectroscopy is used to record the decay of the metal carbonyl. IR spectroscopy supported by DFT calculations yields valuable insights in the CO release reaction mechanism. The focus is set on two different CORMs: CORM-2 (Ru_2(CO)_6Cl_4) and on the photoactive CORM-S1 (photoCORM [Fe(CO)_2(SCH_2CH_2NH_2)_2]). Our results indicate that the CO liberation from CORM-2 strongly depends on sodium dithionite, which is required for the commonly applied myoglobin assay and that CORMS1 loses all its bound CO molecules upon irradiation with blue light.
机译:一氧化碳(CO)对哺乳动物而言是有毒气体,尽管存在这一事实,但它还是在这些生物体中自然产生的,并已被证明对医学治疗也是有益的。因此,集中释放CO的分子(CORM)以用于生理用途的CO的施用和给药。这些化合物几乎都是羰基金属配合物,已被合成和研究。但是,对于大多数CORM,尽管至关重要,但仍未完全阐明CO释放的确切反应机理。广泛使用的肌红蛋白测定法用于测试CO释放具有几个缺点,因此,必须采用不同的方法来表征CORM。在这项工作中,使用不同的红外吸收光谱设置来分析和量化各种CORM衰减过程中的CO释放:采用气相IR光谱跟随CO的释放,并采用衰减全反射(ATR)红外光谱。用于记录羰基金属的衰变。 DFT计算支持的红外光谱在CO释放反应机理中产生了有价值的见解。焦点设置在两个不同的CORM上:CORM-2(Ru_2(CO)_6Cl_4)和光敏CORM-S1(photoCORM [Fe(CO)_2(SCH_2CH_2NH_2)_2])。我们的结果表明,从CORM-2释放出的CO很大程度上取决于连二亚硫酸钠,这是常用的肌红蛋白测定所必需的,并且CORMS1在蓝光照射下会失去所有结合的CO分子。

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