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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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The electron transport chain (ETC) is a crucial metabolic pathway that facilitates energy conversion in prokaryotic and eukaryotic cells. In eukaryotes, the ETC comprises four membrane-associated protein complexes in the inner mitochondrial membrane. In prokaryotes, the ETC in the plasma membrane can vary in composition, with fewer or different complexes depending on the organism and environmental conditions. These complexes transfer electrons from electron donors, such as NADH and FADH2, to...
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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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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.
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Proton Transport in Metal-Organic Frameworks.

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Solid-state proton conductors (SSPCs) are crucial for fuel cells. Metal-organic frameworks (MOFs) show high proton conductivity and their mechanisms are now understood, advancing electrochemical device technology.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Solid-state proton conductors (SSPCs) are vital for fuel cell safety and efficiency.
  • Developing new SSPCs with high performance and understanding their conduction mechanisms are critical research areas.
  • Porous metal-organic frameworks (MOFs) are emerging as promising proton conductors due to their unique structural properties.

Purpose of the Study:

  • To review recent advances in proton-conductive MOFs.
  • To provide a comprehensive understanding of proton transport mechanisms in MOFs.
  • To discuss design strategies, characterization methods, and future directions for practical SSPCs.

Main Methods:

  • Literature review of recent studies on proton-conductive MOFs.
  • Analysis of synthetic strategies and their impact on proton conductivity.
  • Examination of characterization techniques (NMR, X-ray diffraction, neutron scattering) and computational studies.

Main Results:

  • Significant progress has been made in developing MOFs with high proton conductivity (>10⁻² S cm⁻¹).
  • Conduction mechanisms in MOFs have been elucidated through advanced analytical and computational tools.
  • MOFs offer tunable properties for adsorbing guest molecules essential for proton conduction.

Conclusions:

  • Proton-conductive MOFs represent a significant advancement in solid-state proton conduction.
  • Understanding the fundamental principles and design strategies is key to optimizing MOF performance.
  • Further research is needed to address challenges for the practical application of MOFs in SSPCs.