报告题目：Combustion, respiration, ageing and magnetic properties of reactive oxygen species
报 告 人：Professor Boris F. Minaev 乌克兰赫梅利尼茨基国立大学
报告时间：2024年10月15日（周二）14:30
报告地点：Zoom Meeting https://us02web.zoom.us/j/88213314751?pwd=6PagbuKq5eEEu7vKFJThirlLwCZ4wG.1
会议号: 882 1331 4751 密码: 060577
唐敖庆楼C区532会议室(线下地点)
主持人：闫冰教授
主办单位：原子与分子物理研究所
报告人简介：
Boris F. Minaev is the head of Chemistry and Nanomaterial Science Department at the Bohdan Khmelnytsky National University in Cherkasy, Ukraine.He was awarded the Honored Worker of Science and Technology of Ukraine on 2012. He was awarded Life achievements award from American Biographic Institute for “The Singlet Oxygen Emission Theory”on 1999. He is the leader and coordinator of national research projects: a number of projects (five) in organic synthesis and electronic structure calculations for development of OLED technology (2008-2021) governed by Ministry of Education and Science in Ukraine.
摘要：
Molecular oxygen continues to challenge various branches of scientific research in physics, chemistry, biology and medicine, even though it has attracted the attention of all natural sciences for more than 250 years since the discoveries of Scheele and Lavoisier. It has long been known that oxygen from the air can be either chemically inert or extremely active, depending on the presence of radicals in the immediate environment. In various processes from combustion to respiration, this simple transparent gas can exhibit great chemical activity, while passively existing in the Earth's atmosphere for billions of years without visible changes in a huge gas ocean. The chemical reactivity of oxygen strongly depends on its spin properties. The 21st century gives us wonderful discoveries in the molecular sciences, but they pass over many secrets of the O2 molecule associated with the bioactivation of oxygen. The triplet O2 molecule exhibits sluggish chemical reactivity in the absence of paramagnetic metal ions or organic radicals in the immediate environment. The two parallel spins of the highest energy el3ctron pair in the O2 molecule on the doubly degenerate πg MO make oxygen very difficult to be reactive, despite its obvious thermodynamic strength and propensity to oxidize and burn everything around it. Our world has not yet burned up because of the spin prohibition of this electron pair. Nature has developed numerous enzymes to open these spin valves inside living matter. In this talk, we discuss a simple idea about the role of the internal magnetic interaction inside the open πg shell of oxygen, which regulates, via O2 reduction, the spin prohibition for dioxygen insertion into the substrate catalyzed by dioxygenases that do not contain any cofactor. The main goal of this study is the insertion of oxygen into the enolized form of ribulose 1,5-bisphosphate (RuBP) in a cofactor-less oxygenase called Rubisco.
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