Synthesis, characterisation, and X-ray structures of zinc(II) complexes bearing camphor-based ethyleneamineimines as pre-catalysts for heterotactic-enriched polylactide from rac-lactide

Synthesis and Characterization of Zinc(II), Cadmium(II), and Palladium(II) Complexes with the Thiophene-Derived Schiff Base Ligand

“…The geometry of the M­(II) complex might have steered the hetereotacticity of PLA in the studied complexes. However, the final heterotacticities are comparable to the ones previously reported for diisopropoxide-Zn­(II) complexes . Additionally, the PDIs of the observed PLA was also not affected by the metal center variation.…”

“…Schiff base ligands have gained superior attention owing to their extraordinary synthetic and structural properties, fine tunability, and chemical selectivity of the central metal atom. , Schiff bases are considered the most promising ligands, due to their exceptional chelating properties with diverse geometries, ranging from N , N ′-bidentate to N , N ′,X-tridentate and N , N ′, N ,X′-tetradentate. − The azomethine group in these Schiff bases controls the central ion performance in a wide range of promising catalytic reactions like olefin hydrogenation, cyclic olefin ring-opening polymerization (ROP), photochromic properties, pharmacological and biological applications. − Several transition metal complexes supported by Schiff base ligands with thiophene as a structural fragment were studied using a combined experimental and theoretical approach , and it was found that ab initio density functional theory (DFT) calculations reproduce the atomic and electronic structure and spectra of the complexes with high accuracy.…”

“… 3 − 6 The azomethine group in these Schiff bases controls the central ion performance in a wide range of promising catalytic reactions like olefin hydrogenation, cyclic olefin ring-opening polymerization (ROP), photochromic properties, pharmacological and biological applications. 5 − 11 Several transition metal complexes supported by Schiff base ligands with thiophene as a structural fragment were studied using a combined experimental and theoretical approach 12 , 13 and it was found that ab initio density functional theory (DFT) calculations reproduce the atomic and electronic structure and spectra of the complexes with high accuracy.…”

Synthesis, structures, and catalytic efficiency in ring opening polymerization of rac-lactide with tridentate vs. bidentate cobalt(ii), zinc(ii), and cadmium(ii) complexes containing N-substituted N,N-bis((3,5-dimethyl-1H-pyrazol-1-yl)methyl)amine ligands

“…25 The architecture of the ligand coordinating the metal center is one of the key factors determining the catalyst's ability to control the stereochemistry and properties of the resultant polymer, 26,27 alongside the identity of the metal center and the temperature at which the polymerization reaction is conducted. The prevalent ligand architectures, including diketiminate, 28,29 Schiff bases, 30,31 bis(phenolate), 32,33 salen, [34][35][36] iminomethylpyridines, 37 (benzoimidazolylmethyl)amine, 38 and (pyrazolylmethyl)pyridine/amine, [39][40][41] have been widely modied to control their stereo-electronic properties, which in turn affect the activity and stereoselectivity of ROP initiators. Thus, choosing carefully the architecture of the ligand is a N-substituted bis(pyrazolyl)amine have been attracting particular interest as nitrogen donor ligands, because the pyrazole nitrogen is a weaker d-donor than imine and pyridine nitrogens, and it affords complexes comprising highly electrophilic M(II) centers.…”

Diverse coordination geometry of cobalt (II), zinc (II), and cadmium (II) complexes comprising N,N‐bis(1H‐pyrazol‐1‐yl)methyl)amines derivatives: Synthesis, structures, and ring opening polymerization of rac‐lactide

“…The ancillary-ligand architecture that was coordinated with the metal complexes was key to controlling the stereochemistry of the resultant polymer. [29] Prevalent ligand architectures, such as diketiminate, [30] salen, [31][32][33] iminomethylpyridines, [34] Schiff bases, [35,36] bis (phenolate), [37,38] (pyrazolylmethyl)pyridine/amine, [39][40][41] and (benzoimidazolylmethyl)amine, [42] have been extensively modified to control the stereo-electronic properties, thus affecting the activity of the ROP catalyst. Recently, our group focused on fine-tuning of N,N-bis(1H-pyrazol-1-yl) methyl)amine framework by employing various with different amine substituents and investigated their catalytic behaviors in ROP of rac-LA.…”