Lewis Acid-base Adduct
Lewis Acid-base Adduct - Related Videos
02:33
Lewis Acids and Bases
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2020
In 1923, G. N. Lewis proposed a generalized definition of acid-base behavior in which acids and bases are identified by their ability to accept or to donate a pair of electrons and form a coordinate covalent bond. A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
02:16
Lewis Acids and Bases
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2023
This lesson delves into Lewis acids and bases in the context of the octet rule for electron-deficient compounds. Here, the concept is discussed, emphasizing the group 13 elements like boron or aluminium. Since group 13 elements possess three valence electrons, they form trivalent compounds with a sextet of electrons and a vacant orbital for the central atom. Consequently, these electron-deficient compounds accept electrons from other species to complete their octet in a chemical reaction. They...
09:00
Lewis Acid-Base Interaction in Ph3P-BH3
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2023
Source: Tamara M. Powers, Department of Chemistry, Texas A&M University One of the goals of chemistry is to use models that account for trends and provide insights into the properties of reactants that contribute to reactivity. Substances have been classified as acids and bases since the time of the ancient Greeks, but the definition of acids and bases has been modified and expanded over the years.1 The ancient Greeks would characterize substances by taste, and defined acids as those that...
02:36
Lewis Symbols and the Octet Rule
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2020
Chemical bonds are complex interactions between two or more atoms or ions, which reduce the potential energy of the molecule. Gilbert N. Lewis developed a model called the Lewis model that simplified the depiction of chemical bond formation and provided straightforward explanations for the chemical bonds seen in most common compounds. Lewis Model The Lewis model depicts chemical bond formation by the sharing or transfer of valence electrons, which helps to attain a stable electron...
07:52
Removal of Branched and Cyclic Compounds by Urea Adduction for Uk'37 Paleothermometry
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2023
Source: Laboratory of Jeff Salacup - University of Massachusetts Amherst As mentioned in previous videos, the product of an organic solvent extraction, a total lipid extract (TLE), is often a complex mixture of hundreds, if not thousands, of different compounds. The researcher is often only interested in a handful of compounds. In the case of our two organic paleothermometers (Uk'37 and MBT/CBT), the interest is in only 6 compounds (2 alkenones and 4 isoprenoidal glycerol dialkyl glycerol...
FAQs
Although the shared electron pair originates from the Lewis base, the resulting bond can become chemically equivalent to other covalent bonds in the structure. This distinction describes how the bond forms, not necessarily how it behaves afterward. Recognizing that equivalence helps connect electron-pair donation with the molecular structures and bonding patterns observed in products.
Adduct formation depends on complementary electronic roles: one reactant must provide an available electron pair, while the other must accept that pair. This framework allows Lewis acid-base chemistry to describe interactions beyond simple proton transfer. It also provides a way to analyze why particular molecular or ionic partners associate during chemical reactions.
The framework applies to both molecular and ionic species, so the overall adduct need not have a single structural form. Boron trifluoride with ammonia illustrates association between molecular partners, whereas metal ions with ligands represent ionic complex formation. This distinction broadens the concept from discrete molecules to charged coordination species.
Electron-pair donation and acceptance provide a direct way to track how interacting species associate during a reaction. The resulting adduct can clarify bonding changes and the relationships among reactants, intermediates, and products. Consequently, Lewis adducts serve as a general framework for interpreting reaction pathways in both inorganic and organic chemistry.
Metal ions can act as electron-pair acceptors, while ligands donate electron pairs to them, producing Lewis adducts associated with complex formation. This perspective identifies the bonding relationship between the central ion and surrounding ligands. It is especially useful for describing coordination-based species within the broader study of inorganic chemistry.
Adduct formation helps explain catalysis by showing how electron-pair donors and acceptors can associate within a reaction pathway. These associations provide a bonding-based description of interactions that may influence how chemical transformations proceed. The concept therefore links local electron-pair behavior with broader catalytic mechanisms across inorganic and organic chemistry.
The framework extends across inorganic and organic chemistry because it focuses on electron-pair donation and acceptance rather than on one particular class of substances. In addition to molecular pairs such as boron trifluoride and ammonia, it describes metal-ion and ligand interactions, complex formation, catalysis, molecular structure, and reaction pathways.