Aluminium complexes containing N,N '-chelating amino-amide hybrid ligands applicable for preparation of biodegradable polymers

作者：Kampova Hana; Riemlova Emilie; Klikarova Jitka; Pejchal Vladimir; Merna Jan; V****k Petr; Svec Petr; Ruzickova Zdenka; Ruzicka Ales^*

来源：Journal of Organometallic Chemistry, 2015, 778: 35-41.

DOI：10.1016/j.jorganchem.2014.12.010

• Poly(trimethylene carbonate)
• Polycaprolactone
• Lactide esterification
• Aluminium
• Amino-amide ligand

Five aluminium complexes containing N,N'-chelating ligands ([2-(Me2NCH2)C6H4N(R)](-); R = H, SiMe3 or benzyl (Bn)) were prepared and structurally characterized by NMR and crystallographic techniques. Aluminium atoms in all compounds are pseudotetrahedrally coordinated with extremely short intramolecular interaction of the pendant amino group (d(Al-N) = 1.96-2.00 angstrom). The catalytic performance of selected complexes (similar to 0.1-0.2 mol. %), either with or without an external co-initiator, in ring opening (co) polymerization of epsilon-caprolactone, L-lactide and trimethylene carbonate was tested yielding satisfactory to excellent amount of polymeric material with M-n similar to 15-70 kg/mol for e-caprolactone, and similar to 30 kg/mol for trimethylene carbonate with good degree of control over the molar mass distribution, initiation efficiency. An excellent conversion of L-lactide to methyl (S,S)-O-lactyllactate is observed upon catalysis by one of the complexes at room temperature.

• 出版日期2015-2-15