Bipyridine

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title: "Bipyridine" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["bipyridines", "chelating-agents", "ligands"] description: "Group of chemical compounds" topic_path: "general/bipyridines" source: "https://en.wikipedia.org/wiki/Bipyridine" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Group of chemical compounds ::

Bipyridines are a family of organic compounds with the formula (C5H4N)2, consisting of two pyridyl (C5H4N) rings. Pyridine is an aromatic nitrogen-containing heterocycle. The bipyridines are all colourless solids, which are soluble in organic solvents and slightly soluble in water. Bipyridines, especially the 4,4' isomer, are mainly of significance in pesticides.

::figure[src="https://upload.wikimedia.org/wikipedia/commons/b/b4/Bipyridine_Isomers.png" caption="The six possible regioisomers of bipyridine:"] ::

(1) 2,2′-bipyridine; (2) 2,3′-bipyridine; (3) 2,4′-bipyridine; (4) 3,3′-bipyridine; (5) 3,4′-bipyridine; (6) 4,4′-bipyridine]]

Six isomers of bipyridine exist, but two are prominent. 2,2′-bipyridine, also known as bipyridyl, dipyridyl, and dipyridine, is a popular ligand in coordination chemistry

2,2′-Bipyridine

Main article: 2,2'-Bipyridine{{!}}2,2′-Bipyridine

2,2′-Bipyridine (2,2′-bipy) is a chelating ligand that forms complexes with most transition metal ions that are of broad academic interest. Many of these complexes have distinctive optical properties, and some are of interest for analysis. Its complexes are used in studies of electron and energy transfer, supramolecular, and materials chemistry, and catalysis.

2,2′-Bipyridine is used in the manufacture of diquat.

4,4′-Bipyridine

Main article: 4,4'-Bipyridine{{!}}4,4′-Bipyridine

4,4′-Bipyridine (4,4′-bipy) is mainly used as a precursor to the N,N′-dimethyl-4,4′-bipyridinium dication commonly known as paraquat. This species is redox active, and its toxicity arises from its ability to interrupt biological electron transfer processes. Because of its structure, 4,4′-bipyridine can bridge between metal centres to give coordination polymers.

3,4′-Bipyridine

The 3,4′-bipyridine derivatives inamrinone and milrinone are used occasionally for short term treatment of congestive heart failure. They inhibit phosphodiesterase and thus increasing cAMP, exerting positive inotropy and causing vasodilation. Inamrinone causes thrombocytopenia. Milrinone decreases survival in heart failure.

References

References

1. {{Ullmann. (2000)
2. (2004). "Comprehensive Coordination Chemistry II: from Biology to Nanotechnology". Elsevier Pergamon.
3. (2000). "Bipyridine: The Most Widely Used Ligand. A Review of Molecules Comprising at Least Two 2,2'-Bipyridine Units". Chemical Reviews.

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