L-lactide polymerization utilizing a hydroxy-functionalized 3,6-Bis(2-pyridyl)pyridazine as supramolecular (co)initiator : construction of polymeric [2 x 2] grids

A hydroxy-functionalized 3,6-bis(2-pyridyl)pyridazine ligand was synthesized from 3,6-bis(2-pyridyl)tetrazine and 5-hexyn-1-ol. This ligand was subsequently polymd. with L-lactide utilizing a controlled aluminum alkoxide-based polymn. The resulting poly(L-lactide) macroligands were characterized with 1H NMR spectroscopy, IR spectroscopy, gel permeation chromatog., and MALDI-TOF-MS, revealing the successful incorporation of the ligand into the polymer chains. Complexation studies of both the hydroxy-functionalized ligand and the macroligands were performed by UV-vis spectroscopic investigations, demonstrating the exclusive formation of metallo-supramol. gridlike architectures. In addn., AFM measurements also revealed the existence of the defined polymeric species. [on SciFinder (R)]