5,10,15,20-Tetrakis(o-pivalamidophenyl)porphyrins (TPVP) and their iron(II) derivatives bearing a proximal imidazole covalently bound at the 2-(β-pyrrolic) position have been synthesized. The visible absorption maxima (λmax) of the 2-substituted TPVP with an electron withdrawing group attached is shifted toward the red region (7-11 nm) compared with that of the original TPVP. The iron(II) complexes having an imidazolyl group at the β-pyrrolic position were five coordinated species with an intramolecularly bound base under argon and reversibly formed a stable dioxygen adduct in response to O2-pressure in toluene at 25 °C. These molecules act as efficient dioxygen carrying molecules. The kinetics of O 2 binding to the 2-substituted Fe(TPVP) complexes are described.
|Number of pages||7|
|Journal||Journal of the Chemical Society, Perkin Transactions 2|
|Publication status||Published - 1995|
ASJC Scopus subject areas