Highly Active Homoleptic Zinc and Magnesium Complexes Supported by Constrained Reduced Schiff Base Ligands for the Ring-Opening Polymerization of Lactide

2021 ◽  
Author(s):  
Tanyawan Pongpanit ◽  
Thonthun Saeteaw ◽  
Phongnarin Chumsaeng ◽  
Pongsakorn Chasing ◽  
Khamphee Phomphrai
Keyword(s):  
Schiff Base ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Schiff Base Ligands ◽  
Highly Active ◽  
Reduced Schiff Base ◽  
Magnesium Complexes ◽  
Reduced Schiff Base Ligands

scholarly journals Ni(II) Dimers of NNO Donor Tridentate Reduced Schiff Base Ligands as Alkali Metal Ion Capturing Agents: Syntheses, Crystal Structures and Magnetic Properties

2018 ◽  
Vol 4 (4) ◽  
pp. 51 ◽  
Author(s):  
Monotosh Mondal ◽  
Maharudra Chakraborty ◽  
Michael G. B. Drew ◽  
Ashutosh Ghosh
Keyword(s):  
Schiff Base ◽  
Metal Ion ◽  
Magnetic Measurements ◽  
Dft Method ◽  
Distorted Octahedral Geometry ◽  
Schiff Base Ligands ◽  
Reduced Schiff Base ◽  
Ferromagnetic Interactions ◽  
Experimental Values ◽  
Reduced Schiff Base Ligands

Three trinuclear Ni(II)-Na(I) complexes,[Ni2(L1)2NaCl3(H2O)]·H2O (1), [Ni2(L2)2NaCl3(H2O)] (2), and [Ni2(L3)2NaCl3(OC4H10)] (3) have been synthesized using three different NNO donor tridentate reduced Schiff base ligands, HL1= 2-[(3-methylamino-propylamino)-methyl]-phenol, HL2= 2-[(3-methylamino-propylamino)-methyl]-4-chloro-phenol, and HL3= 2-[(3-methylamino-propylamino)-methyl]-6-methoxy-phenol that had been structurally characterized. Among these complexes, 1 and 2 are isostructural in which dinuclearNi(II) units act as metalloligands to bind Na(I) ions via phenoxido and chlorido bridges. The Na(I) atom is five-coordinated, and the Ni(II) atom possesses hexacordinated distorted octahedral geometry. In contrast, in complex 3, two -OMe groups from the dinuclear Ni(II) unit also coordinate to Na(I) to make its geometry heptacordinated pentagonal bipyramidal. The magnetic measurements of complexes 1–3 indicate ferromagnetic interactions between dimeric Ni(II) units with J = 3.97 cm−1, 4.66 cm−1, and 5.50 cm−1for 1–3, respectively, as is expected from their low phenoxido bridging angles (89.32°, 89.39°, and 87.32° for 1–3, respectively). The J values have been calculated by broken symmetry DFT method and found to be in good agreement with the experimental values.

scholarly journals Enolic Schiff Base Zinc Amide Complexes: Highly Active Catalysts for Ring-Opening Polymerization of Lactide and ε-Caprolactone

2018 ◽  
Vol 36 (10) ◽  
pp. 1123-1128 ◽  
Author(s):  
Chen-Yang Hu ◽  
Ran-Long Duan ◽  
Jing-Wei Yang ◽  
Shu-Jun Dong ◽  
Zhi-Qiang Sun ◽  
...  
Keyword(s):  
Schiff Base ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Highly Active

Stereoselective ring-opening polymerization of D,L-lactide, initiated by aluminum isopropoxides bearing tridentate nonchiral schiff-base ligands

2011 ◽  
Vol 50 (5) ◽  
pp. 957-966 ◽  
Author(s):  
Kouki Matsubara ◽  
Chihiro Terata ◽  
Hiromichi Sekine ◽  
Kenji Yamatani ◽  
Tatsuo Harada ◽  
...  
Keyword(s):  
Schiff Base ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Schiff Base Ligands

Synthesis and antiradical activity of novel copper(II) complexes of long chain reduced Schiff base ligands

2018 ◽  
Vol 149 (5) ◽  
pp. 901-911 ◽  
Author(s):  
Lucia Lintnerová ◽  
Jindra Valentová ◽  
Peter Herich ◽  
Jozef Kožíšek ◽  
Ferdinand Devínsky
Keyword(s):  
Schiff Base ◽  
Antiradical Activity ◽  
Schiff Base Ligands ◽  
Reduced Schiff Base ◽  
Reduced Schiff Base Ligands ◽  
Long Chain
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