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Related Concept Videos

Crystal Field Theory - Octahedral Complexes02:58

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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.
CFT focuses on...
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Polar Covalent Bonds02:24

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Covalent bonds are formed between two atoms when both have similar tendencies to attract electrons to themselves (i.e., when both atoms have identical or fairly similar ionization energies and electron affinities). Nonmetal atoms frequently form covalent bonds with other nonmetal atoms. For example, the hydrogen molecule, H2, contains a covalent bond between its two hydrogen atoms. When two separate hydrogen atoms with a particular potential energy approach each other, their valence orbitals...
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Metal-Ligand Bonds02:51

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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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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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Electronegativity02:54

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Whether a bond is nonpolar or polar covalent is determined by a property of the bonding atoms called electronegativity. 
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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Covalent Fragment Screening Using the Quantitative Irreversible Tethering Assay
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Normalizing Covalent Potency for Electrophilicity with Ligand Reactivity Efficiency.

Benjamin D Horning1, Cian Kingston1, Gabriel M Simon1

  • 1Vividion Therapeutics, Inc., San Diego, California 92121, United States.

Journal of Medicinal Chemistry
|March 17, 2026
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Summary
This summary is machine-generated.

Medicinal chemists can now better design covalent drugs. A new metric, ligand reactivity efficiency (LRE), uses glutathione consumption to assess drug potency and electrophilicity more efficiently.

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Area of Science:

  • Medicinal Chemistry
  • Drug Discovery
  • Chemical Biology

Background:

  • Covalent drugs are crucial for targeting difficult disease targets.
  • Traditional methods for assessing covalent drug reactivity (k_inact, K_I) are time-consuming and potentially misleading.
  • A "covalent-first" strategy has successfully advanced drug discovery.

Purpose of the Study:

  • To introduce a novel method for normalizing covalent drug potency against electrophilicity.
  • To present a new metric, ligand reactivity efficiency (LRE), for rational covalent drug design.
  • To provide a more practical and informative approach to assessing covalent warhead reactivity.

Main Methods:

  • Utilized glutathione (GSH) consumption data to quantify electrophilicity.
  • Developed a method to normalize drug potency based on GSH consumption.
  • Calculated target-specific improvements in potency to derive LRE.

Main Results:

  • Presented a new metric, ligand reactivity efficiency (LRE), for evaluating covalent drugs.
  • Demonstrated an alternative to traditional k_inact and K_I measurements.
  • Provided a more efficient way to assess and compare covalent drug reactivity.

Conclusions:

  • Ligand reactivity efficiency (LRE) offers a simplified and more accurate approach to covalent drug design.
  • This metric aids in the rational design of covalent drugs by normalizing potency for electrophilicity.
  • The proposed method aims to benefit medicinal chemists in drug discovery endeavors.