Boron−Nitrogen Coordination Polymers Bearing Ferrocene in the Main Chain

The reaction of 1,1‘-fc(BMe2)2 (2) with pyrazine gives a novel poly(ferrocene) [2·pyz]n, which has been structurally characterized by X-ray crystallography [fc = (C5H4)2Fe; pyz = pyrazine]. The unusual dark green color of the solid material is indicative of charge-transfer interactions between the iron centers and the electron-poor pyrazine adduct bridges.