Bulk solvent-free melt ring-opening polymerization (ROP) of L-lactide catalyzed by Ni(II) and Ni(II)–Ln(III) complexes based on the acyclic Salen-type Schiff-base ligand

Effect of temperature and time for the production of polylactic acid without initiator catalyst from lactide synthesized from ZnO powder catalyst

“…The 13 C NMR spectrum of PLA signals visible for molecular structure of methyl carbon, carbon methane and carbon ester assigned at 16.75, 69.12 and 169.73 ppm, respectively. The resulting synthesized PLA was shown that PLA is formed in the present study for 13 C NMR evaluated similar to that reported by other works [3,14].…”

Synthesis of Biodegradable Polymers: A Review on the Use of Schiff-Base Metal Complexes as Catalysts for the Ring Opening Polymerization (ROP) of Cyclic Esters

“…In both cases, the catalyst efficiency decreased with the lengthening of the Ni‧‧‧Ln intramolecular distance, while the dependency on the lanthanide contraction was observed just for the latter set of complexes. In 2011, a series of heterobimetallic Ni-Ln(III) (Ln = lanthanide) complexes derived from the compounds 70 and 71 were reported by Bao, Lü et al (Figure 14) [59][60][61]. In terms of activity, the bimetallic species proved less performing than their monometallic analogues and required higher temperatures and/or longer reaction times to achieve moderate monomer conversions.…”

Synthesis, spectroscopic findings and crystal engineering of Pb(ii)–Salen coordination polymers, and supramolecular architectures engineered by σ-hole/spodium/tetrel bonds: a combined experimental and theoretical investigation

“… 13,14 The relevant categories of coordination complexes applications are mainly in bioinorganic chemistry, 15 separations and encapsulation, 16 and bio-relevant catalysis. 17 Also, hydrometallurgy, 18 metal clusters, 19 material science and magnetism, 20 and small molecules transport and activation. 21 Within the competence of crystal engineering, scientists are using various non-covalent intermolecular forces.…”