Recent research has shown that the complexation of metals-organics plays an important role in atmospheric particulate matter, whose health effects should be taken into account. This work investigates the interactions between catechols (CAs), i.e., 4-nitrocatechol (4NC) and 4-methylcatechol (4MC), and transition metals (i.e., Fe) in the aqueous phase dark reaction. The formation of Fe/CAs complexes and secondary organics products are analyzed by UV–Vis spectroscopy, stopped-flow spectroscopy, high-resolution mass spectrometry and Raman spectroscopy, while the insoluble particulate matter formed from the CAs/Fe mixtures are characterized by the FTIR, X-ray photoelectron spectroscopy (XPS) and thermogravimetric-quadrupole-mass spectrometry (TG-Q-MS). On the basis of the density functional theory (DFT) calculation and experimental results, the possible formation pathways for the complexes of Fe(III) with 4NC (a proxy for organics) are proposed. The Fe/CAs complexes and organics products perhaps have significant sources of light absorption which play an important role in influencing the intensity of atmospheric radiation and particulate phase photochemistry. Besides, the cytotoxicity is tested as a function of concentrations for CAs/Fe mixtures in BEAS-2B cells. Our results show that CAs/Fe mixtures have strong association with cytotoxicity, indicating the mixtures have potential influence to human health.

最近的研究表明，金属有机物的络合在大气颗粒物中起着重要作用，应考虑其对健康的影响。这项工作研究了水相暗反应中邻苯二酚（CAs），即4-硝基邻苯二酚（4NC）和4-甲基邻苯二酚（4MC）与过渡金属（即Fe）之间的相互作用。通过UV-Vis光谱，停流光谱，高分辨率质谱和拉曼光谱分析Fe / CAs配合物和次要有机产物的形成，而通过FTIR表征由CAs / Fe混合物形成的不溶性颗粒物，X射线光电子能谱（XPS）和热重四极杆质谱（TG-Q-MS）。根据密度泛函理论（DFT）的计算和实验结果，提出了Fe（III）与4NC（有机物的替代物）的配合物的可能形成途径。Fe / CAs络合物和有机物可能具有大量的光吸收源，这些光吸收源在影响大气辐射强度和颗粒相光化学方面起着重要作用。此外，测试细胞毒性与BEAS-2B细胞中CAs / Fe混合物浓度的关系。我们的结果表明，CAs / Fe混合物与细胞毒性密切相关，表明该混合物对人体健康具有潜在影响。Fe / CAs络合物和有机物可能具有大量的光吸收源，这些光吸收源在影响大气辐射强度和颗粒相光化学方面起着重要作用。此外，测试细胞毒性与BEAS-2B细胞中CAs / Fe混合物浓度的关系。我们的结果表明，CAs / Fe混合物与细胞毒性密切相关，表明该混合物对人体健康具有潜在影响。Fe / CAs络合物和有机物可能具有重要的光吸收源，这些光吸收源在影响大气辐射强度和颗粒相光化学方面起着重要作用。此外，测试细胞毒性与BEAS-2B细胞中CAs / Fe混合物浓度的关系。我们的结果表明，CAs / Fe混合物与细胞毒性密切相关，表明该混合物对人体健康具有潜在影响。