Building from Ga‐Porphyrins: Synthesis of Ga‐Acetylide Complexes Using Acetylenes and Polyynes.

Multidimensional, conjugated building blocks have been formed through the axial coordination of polyynes to the central Ga atom of tetraarylporphyrins. Electron deficient pentafluorophenyl substituents in the meso‐positions provide more stable σ‐acetylide complexes to Ga than analogous structures with tert‐butylphenyl groups. Mono‐, di‐, and triynes have been used, including a pyridyl endcapped diyne that allows for formation of porphyrin triads through coordination of the pyridyl ligand to a Ru porphyrin. Hierarchical assembly: σ‐Acetylide complexes derived from mono‐, di‐, and triynes have been efficiently appended to the central metal of Ga‐porphyrins. Terminal functionalization of an acetylide with a metal‐coordinating pyridyl end‐group allows construction of a new class of bimetallic porphyrin triads through self‐assembly. [ABSTRACT FROM AUTHOR]