无激活多点协同质子电子道
Miriam A Bowring1,2,3, Liam R Bradshaw2, Giovanny A Parada1
1Department of Chemistry , Yale University , New Haven , Connecticut 06520 , United States.
Journal of the American Chemical Society
|May 31, 2018
概括
研究人员设计了一个分子三合体, 这一过程通过量子道, 独立于温度, 提供了有效的能量转换的见解.
科学领域:
- 摄影化学
- 分子生物物理学
- 量子化学
背景情况:
- 质子和电子转移对于能量转换和储存过程至关重要.
- 了解和控制这些电荷转移机制对于人工光合作用和燃料电池等技术的发展至关重要.
研究的目的:
- 设计和研究一种新型分子系统,能够进行快速的光诱导多位点协同质子电子转移 (MS-CPET).
- 阐明MS-CPET过程的机制和温度依赖性,重点关注质子和电子道的作用.
主要方法:
- 甲--胺分子三元组的设计.
- 使用光火和短暂的吸收光谱.
- 在溶液和玻璃中进行广泛的温度范围 (5.5K到350K) 的实验.
主要成果:
- 设计的分子三元体表现出快速的MS-CPET,其速率常数为3.2 × 10^10 s^-1在298 K.
- 反应速率和动态同位素效应 (KIE) 是独立于温度的,从5.5K到90K,表示零阿雷尼乌斯激活能量.
- 从145K到350K观察到最小的温度依赖,这表明了一个主要的道机制.
结论:
- 观察到的MS-CPET反应主要是通过不同方向的质子和电子的量子道.
- 速率常数直接反映了同时发生质子和电子双道的概率.
- 这项研究提供了一个分子平台,用于探索与能源转换和储存相关的高效,热独立的电荷传输.
相关概念视频
Electron Transport Chains
112.7K
The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
The ETC is comprised of...
The ETC is comprised of...
112.7K
Electron Carriers
92.0K
Electron carriers can be thought of as electron shuttles. These compounds can easily accept electrons (i.e., be reduced) or lose them (i.e., be oxidized). They play an essential role in energy production because cellular respiration is contingent on the flow of electrons.
Over the many stages of cellular respiration, glucose breaks down into carbon dioxide and water. Electron carriers pick up electrons lost by glucose in these reactions, temporarily storing and releasing them into the electron...
Over the many stages of cellular respiration, glucose breaks down into carbon dioxide and water. Electron carriers pick up electrons lost by glucose in these reactions, temporarily storing and releasing them into the electron...
92.0K
Proton (¹H) NMR: Chemical Shift
3.5K
Organic molecules primarily contain carbon and hydrogen atoms. While all the hydrogen isotopes are NMR-active, protium or hydrogen-1 is the most abundant. It has a significant energy separation between its nuclear spin states due to its large gyromagnetic ratio. As per Boltzmann's distribution, an increase in the energy separation implies a greater excess population of nuclei available for excitation, resulting in a strong NMR absorption signal.
Absorption signals of all the protium nuclei...
Absorption signals of all the protium nuclei...
3.5K
Electron Affinity
43.5K
The electron affinity (EA) is the energy change for adding an electron to a gaseous atom to form an anion (negative ion).
43.5K
Electron Configuration of Multielectron Atoms
65.2K
The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
65.2K
Electron Behavior
109.2K
Overview
Electrons are negatively charged subatomic particles that are attracted to an orbit around the positively-charged nucleus of an atom. They reside in locations that are associated with energy levels called shells and are further organized into sub-shells and orbitals within each shell.
Electrons Orbit the Nucleus
Electrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the...
Electrons are negatively charged subatomic particles that are attracted to an orbit around the positively-charged nucleus of an atom. They reside in locations that are associated with energy levels called shells and are further organized into sub-shells and orbitals within each shell.
Electrons Orbit the Nucleus
Electrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the...
109.2K


