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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Valence Bond Theory02:42

Valence Bond Theory

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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...
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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.1K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.1K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
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Spin crossover in metal-organic cages.

Zhen Shao1, Yin-Shan Meng1,2, Yuan-Yuan Zhu3

  • 1State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, No. 2 Linggong Road, Dalian, 116024, China. liutao@dlut.edu.cn.

Dalton Transactions (Cambridge, England : 2003)
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Spin-crossover metal-organic cages (SCO-MOCs) are novel molecular switches. Recent advances focus on optimizing SCO behavior via coordination engineering for smart materials and quantum technologies.

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Synthesis of a Water-soluble Metal&#8211;Organic Complex Array
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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Quantum Science

Background:

  • Spin-crossover (SCO) materials act as stimulus-responsive molecular switches, enabling applications in data storage and sensing.
  • SCO materials exhibit bistability, coupling magnetic properties with external stimuli like temperature, pressure, light, or electric fields.
  • Spin-crossover metal-organic cages (SCO-MOCs) integrate SCO properties with molecular functionality, offering tunable architectures and host-guest interactions.

Purpose of the Study:

  • To review recent advancements in Fe(II)/Fe(III)-based SCO-MOCs over the last decade.
  • To systematically overview strategies for optimizing SCO behavior in these systems.
  • To discuss potential applications and future research directions for SCO-MOCs.

Main Methods:

  • Coordination microenvironment engineering to tune SCO properties.
  • Supramolecular assembly strategies for creating SCO-MOCs.
  • Analysis of ligand field modulation and spatial confinement effects on SCO behavior.
  • Investigation of guest encapsulation mechanisms within SCO-MOCs.

Main Results:

  • Highlighting key strategies for enhancing SCO characteristics in coordination cages.
  • Demonstrating the impact of ligand design and structural confinement on SCO performance.
  • Identifying successful guest encapsulation methods within SCO-MOC frameworks.
  • Showcasing the potential of SCO-MOCs in drug delivery and sensing.

Conclusions:

  • SCO-MOCs represent a promising platform for next-generation smart materials.
  • Further research into ligand field modulation and supramolecular assembly will unlock advanced functionalities.
  • SCO-MOCs hold transformative potential for quantum-enabled technologies and advanced sensing applications.