Lewis acid-base
The Lewis acid-base theory expands the definition of acids and bases beyond the traditional Brønsted-Lowry concept. In this framework, a Lewis acid is defined as a substance that can accept an electron pair, while a Lewis base is a substance that can donate an electron pair. This interaction forms a coordinate covalent bond, allowing for a broader range of chemical reactions.
This theory is particularly useful in explaining reactions that do not involve protons, such as those in coordination chemistry and organic chemistry. By focusing on electron pair transfer, the Lewis acid-base concept helps to understand various chemical processes and mechanisms.