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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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If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
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A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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Simultaneous Hydrogen Bonds with Different Binding Modes: The Acceptor "Rules" but the Donor "Chooses".

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  • 1School of Chemistry, Trinity College Dublin, The University of Dublin, 154-160 Pearse Street, Dublin, 2, Ireland.

Chemistry (Weinheim an Der Bergstrasse, Germany)
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Researchers visualized a "market" where hydrogen bond acceptors act as vendors and hydrogen bond donors act as customers. This analogy helps understand molecular interactions and binding preferences in chemistry.

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Area of Science:

  • Supramolecular Chemistry
  • Chemical Crystallography

Background:

  • Hydrogen bonding is a fundamental interaction in chemistry.
  • Understanding hydrogen bond donor-acceptor interactions is crucial for molecular recognition and self-assembly.

Purpose of the Study:

  • To visually represent and explain the concept of hydrogen bond interactions using an analogy.
  • To illustrate how hydrogen bond donors select specific binding modes with acceptors.

Main Methods:

  • Conceptualization of a molecular "market" analogy.
  • Graphical representation of hydrogen bond interactions.

Main Results:

  • The study presents a novel analogy of a market for hydrogen bonding.
  • Hydrogen bond donors are depicted as customers choosing "vegetables" (binding modes) from hydrogen bond acceptors (vendors).

Conclusions:

  • The market analogy provides an intuitive framework for understanding hydrogen bond selectivity.
  • This visualization aids in comprehending complex molecular interactions in supramolecular chemistry.