Тип публикации: статья из журнала

Год издания: 2023

Идентификатор DOI: 10.1021/acsomega.2c08001

Аннотация: Zn(II), Pd(II), and Cd(II) complexes, [LTHMCl2] (M = Zn, Pd; X = Br, Cl) and [LTHCd(μ-X)X]n (X = Cl, Br; n = n, 2), supported by the (E)-N1,N1-dimethyl-N2-(thiophen-2-ylmethylene)ethane-1,2-diamine (LTH ) ligand are synthesized and structurally characterized. Density functional theory (DFT) electronic structure calculations and varПоказать полностьюiable-temperature NMR support the presence of two conformers and a dynamic interconversion process of the minor conformer to the major one in solution. It is found that the existence of two relevant complex conformers and their respective ratios in solution depend on the central metal ions and counter ions, either Cl- or Br-. Among the two relevant conformers, a single conformer is crystallized and X-ray diffraction analysis revealed a distorted tetrahedral geometry for Zn(II) complexes, and a distorted square planar and square pyramidal geometry for Pd(II) and Cd(II) complexes, respectively. It is shown that [LTHMCl2]/LiOiPr (M = Zn, Pd) and [LTHCd(μ-Cl)Cl]n /LiOiPr can effectively catalyze the ring-opening polymerization (ROP) reaction of rac-lactide (rac-LA) with 94% conversion within 30 s with [LTHZnCl2]/LiOiPr at 0 °C. Overall, hetero-enriched poly(lactic acid)s (PLAs) were provided by these catalytic systems with [LTHZnCl2]/LiOiPr producing PLA with higher heterotactic bias (Pr up to 0.74 at 0 °C).

Журнал: ACS Omega

Выпуск журнала: Т. 8, № 6

Номера страниц: 6016-6029

ISSN журнала: 24701343

• Lee Jaegyeong (Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea)
• Melchakova Iuliia (Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea)
• Nayab Saira (Department of Chemistry, Shaheed Benazir Bhutto University (SBBU), Sheringal 18050, Upper Dir, Khyber Pakhtunkhwa, Islamic Republic of Pakistan)
• Kim Kyeonghun (Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea)
• Ko Young Ho (Center for Self-Assembly and Complexity (CSC), Institute for Basic Science (IBS), Pohang University of Science and Technology (POSTEC), Pohang 37673, Republic of Korea)
• Yoon Minyoung (Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea)
• Avramov Paul (Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea)
• Lee Hyosun (Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea)

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