Complexing ability of dimeric zinc octaalkylporphyrinates with a poly(ethyleneoxy) bridge toward 1,4-diazabicyclo[2.2.2]octane and 1,4-diazine

The formation of “guest-host” complexes from dimeric zinc octaalkylporphyrinates with a poly(ethyleneoxy) bridge and various bidentate ligands containing two N atoms was studied by spectrophotometric titration and ¹H NMR spectroscopy in toluene-methanol (5: 1). The reactions of dimeric porphyrinates with 1,4-diazabicyclo[2.2.2]octane and 1,4-diazine gave 1: 1 or 1: 2 complexes, depending on the molar ratio of metal porphyrin and the ligand. The stability constants of the complexes obtained and the concentration ranges for their formation were determined.