Binuclear Fluoro-Bridged Zinc and Cadmium Complexes of a Schiff Base Expanded Porphyrin: Fluoride Abstraction from the Tetrafluoroborate Anion

Reactions of the Schiff base oligopyrrolic octaazamacrocycle 1
with BF4- salts of divalent zinc and cadmium result in fluoride
anion abstraction and the formation of difluoride-bridged metal
complexes. X-ray diffraction analyses provide support for the notion
that hydrogen-bonding interactions, involving the N−H groups of
the macrocycle and the coordinated fluoride ions, play an important
role in stabilizing these new complexes.