title: Yttrium and aluminium complexes bearing dithiodiolate ligands: synthesis and application in cyclic ester polymerization.
abstract: Yttrium and aluminium complexes of two dithiodiolate ligands that feature different bridges (CF3)2C(OH)CH2SRSCH2C(OH)(CF3)2 (L(1)-H2, R = CH2CH2 and L(2)-H2, R = C6H4) were synthesized in good yields by reacting tris(silylamide)yttrium or trimethylaluminium with one equivalent of the proligand. All complexes were characterized by NMR and elemental analysis, and single-crystal X-ray structural analysis was also performed for one of the yttrium complexes. The catalytic activities of the four complexes in the ring-opening polymerization of ε-caprolactone and rac-lactide have been investigated. Furthermore, DOSY experiment and DFT calculations have been carried out to determine the structure of the isopropoxo derivative of the complex L(2)Y amide.
authors.affiliation: Dipartimento di Chimica e Biologia, Università di Salerno, via Giovanni Paolo II 132, I-84084, Fisciano, Salerno, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Meduri
authors.forename: M
authors.initials: M
authors.lastname: Cozzolino
authors.forename: S
authors.initials: S
authors.lastname: Milione
authors.forename: K
authors.initials: K
authors.lastname: Press
authors.forename: E
authors.initials: E
authors.lastname: Sergeeva
authors.forename: C
authors.initials: C
authors.lastname: Tedesco
authors.forename: M
authors.initials: M
authors.lastname: Mazzeo
authors.forename: M
authors.initials: M
authors.lastname: Lamberti