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相关概念视频

Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

Lewis Structures of Molecular Compounds and Polyatomic Ions

To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
Predicting Molecular Geometry02:27

Predicting Molecular Geometry

VSEPR Theory for Determination of Electron Pair Geometries
Weak Acid Solutions04:02

Weak Acid Solutions

Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Acidity and Basicity of Alcohols and Phenols02:36

Acidity and Basicity of Alcohols and Phenols

Like water, alcohols are weak acids and bases. This is attributed to the polarization of the O–H bond making the hydrogen partially positive. Moreover, the electron pairs on the oxygen atom of alcohol make it both basic and nucleophilic. Protonation of an alcohol converts hydroxide, a poor leaving group, into water—a good one. The two acid–base equilibria corresponding to ethanol are depicted below.

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对于光系II的进化氧复合体的二次二次分子模型. [MnIV4O5 ((terpy) 4 ((H2O) 2)) ((ClO4) 6) 的合成和特性

Hongyu Chen1, J W Faller, Robert H Crabtree

  • 1Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, USA.

Journal of the American Chemical Society
|June 10, 2004
PubMed
概括

研究人员合成了一种新型的复合物,即二进制的二进制体,模拟光系统II中的进化氧复合物. 这种模型化合物有助于理解光合作用过程中水氧化的复杂机制.

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科学领域:

  • 生物有机化学 生物有机化学
  • 光合作用研究研究 光合作用研究
  • 协调化学 协调化学

背景情况:

  • 光系统II中的氧进化复合体 (OEC) 对于光合作用至关重要,它分裂水以释放氧气.
  • 了解OEC的机制需要模拟其结构和反应性的模型化合物.
  • 基于的复合物是主要的目标,因为在OEC中起着核心作用.

研究的目的:

  • 合成和表征一种新型的二次数的复合物,作为OEC的模型.
  • 在不同的pH条件下研究复合物的反应性.
  • 阐明光系统II中水氧化中间体的潜在机制.

主要方法:

  • 目标复合物的合成: [[(H(2) O) ((terpy) Mn(IV) (((micro-O) ((2) Mn(IV) ((terpy))) ((2) ((micro-O))) ((ClO ((4)) ((6).
  • 使用X射线晶体学进行表征,以确定精确的分子结构.
  • 电子喷雾电离质谱仪 (ESI-MS) 用于分子量确认.

主要成果:

  • 成功制备和结构确定二次数的二次数复合物.
  • 对一个Mn(III/IV) 二次体与Mn(2+) 和一个Mn(IV/IV) 物种的pH依赖不成比例的观察.
  • 发现Mn ((IV/IV) 种类二元化,形成目标复合体.

结论:

  • 合成的复合物作为OEC中间体的有价值的结构和功能模型.
  • 建议微氧桥的质子化作为不成比例的初始步骤,类似于已知的系统.
  • 这项研究提供了有关光合作用过程中水氧化相关的氧化还原化学的见解.