In chemistry, pi stacking (also called π–π stacking) refers to attractive, noncovalent interactions between aromatic rings. These interactions are important in nucleobase stacking within DNA and RNA molecules, protein folding, template-directed synthesis, materials science, and molecular recognition, although new research suggests that pi stacking may not be operative in some of these applications. Despite intense experimental and theoretical interest, there is no unified description of the factors that contribute to pi stacking interactions
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“The Universal Soul, as it is called, has an interest in the stacking of hay, the foddering of cattle, and the draining of peat-meadows.”
—Henry David Thoreau (18171862)