Mononuclear zinc(II) Schiff base complexes as catalysts for the ring-opening polymerization of lactide

The synthesis of a Cu(ii) Schiff base complex using a bidentate N2O2 donor ligand: crystal structure, photophysical properties, and antibacterial activities

“…On the basis of the crystal data, E conguration with respect to the azomethine -CH]Nbond is exhibited in both the raw ligand and the complex. The distance of C (7)]N(1) in the Cu(II) complex (0.1292(2) nm) is a little longer than that of the HL ligand (0.1276(3) nm). The dihedral angle of two phenyl rings (ring A, C(1)-C(6); ring B, C(8)-C(13)) of the Cu(II) complex is 89.40 (5) , which is much larger than that of the HL ligand a Final weighting scheme:…”

“…In recent years, Schiff base complexes with d 10 metals have been extensively explored. [7][8][9] The copper ion has biological activity and it is an essential trace element in the human body; it plays critical and crucial roles in many biological processes and enzyme regulation as well as in the structural and functional enhancement of proteins. Copper complexes have medical applications, with some of them being used as model molecules for biological oxygen carrier systems 10 and some having applications in the eld of analytical chemistry.…”

Mono- and dimeric zinc(ii) complexes for PLA production and degradation into methyl lactate – a chemical recycling method

“…Catalysts that operate under industrially viable conditions are desirable since they remove the need for solvents, which are typically a significant source of waste. [45][46][47][48][49] The lactide monomer, rac-LA, was recrystallised from toluene once prior to use, and benzyl alcohol was employed as a co-initiator. Conversion was determined via analysis of the methine region (ca.…”

“…In summary, all Zn(II)-initiators exhibited high catalyst activity in the polymerisation of rac-LA, consistent with previous examples in the literature. 41,42,45,46,[50][51][52][53][54][55][56][57][58][59][60][61][62][63] Polymerisation kinetics Generally, Zn 2 (1-3) 2 Et 2 outperformed their monomeric counterparts under both melt and solution conditions. A mono-vs. dimeric system kinetic study was envisaged but not possible due to the extremely high activity of the latter.…”

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

“…Very recently, Zn complexes 116-119, bearing heteroatom-containing [N,O] ligands, were shown to be active in the ROP of L-lactide under industrially relevant conditions ( Figure 20) [76]. Conversions ranging between 56% and 66% were achieved with all catalysts within 1 h when using purified L-LA as monomer.…”