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Cryo IR Spectroscopy of [Hemin]+ Complexes in Isolation
The Journal of Physical Chemistry A ( IF 2.7 ) Pub Date : 2017-09-13 00:00:00 , DOI: 10.1021/acs.jpca.7b08604
Sebastian Dillinger 1 , Johannes Lang 1 , Gereon Niedner-Schatteburg 1
Affiliation  

We present cryo IR spectra of isolated [Hemin]+ adducts with CO, N2, and O2 ([Hemin(CO)1]+, [Hemin(CO)2]+, [Hemin(14N2)]+, [Hemin(15N2)]+, and [Hemin(O2)]+). Well resolved bands allow for the elucidation of structure and spin multiplicity in conjunction with density functional (DFT) calculations. There is a quartet spin state for the N2 and CO adducts and a sextet spin state for the O2 adduct, where the O2 retains its triplet state. The double CO adsorption induces significant changes in the vibrational patterns of the IR spectra, which we take as strong evidence for a spin quenching into a doublet. Our study characterizes [Hemin]+, which is the Fe3+ oxidation product of heme that is of ubiquitous presence in hemeproteins.

中文翻译:

分离中[Hemin] +配合物的低温红外光谱

我们提供了分离的[Hemin] +与CO,N 2和O 2([Hemin(CO)1 ] +,[Hemin(CO)2 ] +,[Hemin(14 N 2)] +, [Hemin(15 N 2)] +和[Hemin(O 2)] +)。分辨良好的谱带可以结合密度泛函(DFT)计算来阐明结构和自旋多重性。N 2和CO加合物具有四重态自旋态,而O 2具有六重态自旋态加合物,其中O 2保持其三重态。双重CO吸附引起IR光谱振动模式的显着变化,我们将其作为自旋淬灭成双峰的有力证据。我们的研究表征[Hemin] +,它是血红素蛋白中普遍存在的血红素的Fe 3+氧化产物。
更新日期:2017-09-13
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