trans-difluorosilicon(IV) complexes of tetra-p-tolylporphyrin and tetrakis(p-(trifluoromethyl)phenyl)porphyrin: crystal structures and unprecedented reactivity of hexacoordinate difluorosilanes

The X-ray crystal structures of the difluoro(porphyrinato)silicon(IV) complexes of tetra-p-tolylporphyrin were analyzed to determine their reactivity with hexacoordinate difluorosilanes. The (Por)SiF2 (Por = TTP, TTFP) exhibited Si-F bond lengths that were similar to cis- and trans-difluorosilanes. Furthermore, (TPP)SiF2 exhibited nucleophilic substitution due to the trans geometry of its fluoride units.