Complexing Ability of Dimeric Zinc Octaalkylporphyrinates with a Poly(ethyleneoxy) Bridge toward 1,4-Diazabicyclo[2.2.2]Octane and 1,4-Diazine

摘要

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 spectropho-tometric titration and ~1H NMR spectroscopy in toluene-methanol (5 : 1). The reactions of dimeric porphy-rinates 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.