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2,2'-Bipyridine is a chemical compound with the formula (C5H4N)2. This colorless solid, commonly abbreviated bipy (pronounced "bip-ee"), is a widely used isomer of bipyridine. It is a bidentate chelating ligand, forming complexes with many transition metals. Ruthenium complex and platinum complexes of bipy exhibit intense luminescence, which may have practical applications.
Additional recommended knowledge
Preparation and general properties
It is prepared by the dehydrogenation of pyridine using Raney nickel. Reflecting the popularity of this ligand design, many substituted variants of bipy have been described.
Bipyridine complexes absorb intensely in the visible part of the spectrum. The electronic transitions are attributed to metal-to-ligand charge transfer (MLCT).
Illustrative bipy complexes
Tris(bipy) complexes have three bipyridine molecules are coordinated to a metal ion, written as [M(bipy)3]n+ (M = metal ion; Cr, Fe, Co, Ru, Rh and so on; bpy = 2,2'-bipyridine). These complexes have six-coordinated, octahedral structures and two enantiomers as follows:
These and other homoleptic tris-2,2'-bipy complexes of many transition metals are electroactive. Often, both the metal centred and ligand centred electrochemical reactions are reversible one-electron reactions that can be observed by cyclic voltammetry. Under strongly reducing conditions, most tris(bipy) complexes can be reduced to neutral derivatives containing bipy- ligands. Examples include M(bipy)3, where M = Al, Cr, Si.
Categories: Pyridines | Chelating agents
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "2,2'-Bipyridine". A list of authors is available in Wikipedia.|