text: 2-Phenylpyridine is an organic compound with the formula CHCHN (or CHN). It is a colourless viscous liquid.  The compound and related derivatives have attracted interest as precursors to highly fluorescent metal complexes of possible value as organic light emitting diodes (OLEDs).
  The compound is prepared by the reaction of phenyl lithium with pyridine:
  :CHLi + CHN → CH-CHN + LiH
  The reaction of iridium trichloride with 2-phenylpyridine proceeds via cyclometallation to give the chloride-bridged complex:
  :4 CH-CHN + 2 IrCl(HO) → IrCl(CH-CHN) + 4 HCl
  This complex can be converted to the pictured tris(cyclometallated) derivative tris(2-phenylpyridine)iridium.