Synthesis and crystal structure determination of Mn(II) Schiff base complexes and their performance in ethene polymerization

Sood, Anjali; Räisänen, Minna T.; Aitola, Erkki; Sibaouih, Ahlam; Colacio, Enrique; Ahlgrén, Markku; Nieger, Martin; Repo, Timo; Leskelä, Markku

doi:10.1016/j.poly.2013.03.063

Cited by 10 publications

(3 citation statements)

References 37 publications

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“…The molecular structures of six‐coordinated [(L‐b) 2 MX 2 ] (M = Zn; X = Cl; M = Cd; X = Br) complexes revealed an octahedral geometry around Zn and Cd centers through 2‐equivalents ligands ([L‐b]), included two N atoms of pyridine moieties, two N atoms of 4‐methoxyaniline moieties and two halogen ligands, resulting in the formation of two five‐membered rings (Figures and ) . The bond lengths of M‐N pyridine and M‐N amine in [(L‐b) 2 MX 2 ] (M = Zn; X = Cl; M = Cd; X = Br) were similar to the M‐N bond length of octahedral M (II) complexes.…”

Section: Resultsmentioning

confidence: 99%

“…Transition metal complexes containing ligands with pyridinylmethanimine, pyridinylmethanamine and N ‐methyl‐1‐(pyridin‐2‐yl) methanamine moieties have been broadly researched owing to their diverse coordination geometries ranging from bidentate to polydentate coordination modes . In addition, the steric and electronic properties can be easily modified by appropriate variation on N ‐donors of pyridinylmethanimine moiety, and resulted in stable complexes with a variety of transition or inner transition metals .…”

Section: Introductionmentioning

confidence: 99%

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Zinc (II), palladium (II) and cadmium (II) complexes containing 4‐methoxy‐N‐(pyridin‐2‐ylmethylene) aniline derivatives: Synthesis, characterization and methyl methacrylate polymerization

Park

Lee

et al. 2019

Applied Organom Chemis

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A series of Zn (II), Pd (II) and Cd (II) complexes, [(L)nMX2]m (L = L‐a–L‐c; M = Zn, Pd; X = Cl; M = Cd; X = Br; n, m = 1 or 2), containing 4‐methoxy‐N‐(pyridin‐2‐ylmethylene) aniline (L‐a), 4‐methoxy‐N‐(pyridin‐2‐ylmethyl) aniline (L‐b) and 4‐methoxy‐N‐methyl‐N‐(pyridin‐2‐ylmethyl) aniline (L‐c) have been synthesized and characterized. The X‐ray crystal structures of Pd (II) complexes [L1PdCl2] (L = L‐b and L‐c) revealed distorted square planar geometries obtained via coordinative interaction of the nitrogen atoms of pyridine and amine moieties and two chloro ligands. The geometry around Zn (II) center in [(L‐a)ZnCl2] and [(L‐c)ZnCl2] can be best described as distorted tetrahedral, whereas [(L‐b)2ZnCl2] and [(L‐b)2CdBr2] achieved 6‐coordinated octahedral geometries around Zn and Cd centers through 2‐equivalent ligands, respectively. In addition, a dimeric [(L‐c)Cd(μ‐Br)Br]2 complex exhibited typical 5‐coordinated trigonal bipyramidal geometry around Cd center. The polymerization of methyl methacrylate in the presence of modified methylaluminoxane was evaluated by all the synthesized complexes at 60°C. Among these complexes, [(L‐b)PdCl2] showed the highest catalytic activity [3.80 × 104 g poly (methyl methacrylate) (PMMA)/mol Pd hr−1], yielding high molecular weight (9.12 × 105 g mol−1) PMMA. Syndio‐enriched PMMA (characterized using 1H‐NMR spectroscopy) of about 0.68 was obtained with Tg in the range 120–128°C. Unlike imine and amine moieties, the introduction of N‐methyl moiety has an adverse effect on the catalytic activity, but the syndiotacticity remained unaffected.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Zinc (II), palladium (II) and cadmium (II) complexes containing 4‐methoxy‐N‐(pyridin‐2‐ylmethylene) aniline derivatives: Synthesis, characterization and methyl methacrylate polymerization

Park

Lee

et al. 2019

Applied Organom Chemis

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“…These complexes showed various coordination modes up to the tetradentate . Their structural stability and catalytic efficiency made them useful mainly in the area of structural studies, photoluminescence, spectroscopy, transfer hydrogenation reactions, biological applications, oxidation catalyst, catalysts for alkene polymerization, epoxidation, olefin and MMA polymerizations…”

Section: Introductionmentioning

confidence: 99%

Five‐coordinate dinuclar cobalt (II), copper (II), zinc (II) and cadmium (II) complexes with 4‐bromo‐N‐(2‐pyridinylmethylene)benzenamine: Synthesis, characterisation and methyl methacrylate polymerization

Park

Lee

et al. 2018

Applied Organom Chemis

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A series of late transition metal complexes, [(bpma)Co(μ–Cl)Cl]2, [(bpma)Cu(μ–Cl)Cl]2, [(bpma)Zn(μ–Cl)Cl]2 and [(bpma)Cd(μ–Br)Br]2 (where bpma is 4‐bromo‐N‐((pyridin‐2‐yl)methylene)benzenamine) have been synthesized and structurally characterized. The X‐ray structures of dimeric complexes [(bpma)M(μ–X)X]2 (M = Co, Cu and Zn, X = Cl; M = Cd, X = Br) showed a distorted 5‐coordinate trigonal bipyramidal geometry involving two nitrogen atoms of N,N‐bidentate ligand, two bridged and one terminal halogen atoms. The complex [(bpma)Cu(μ–Cl)Cl]2 revealed the highest catalytic activity for the polymerisation of methyl methacrylate in the presence of modified methylaluminoxane with an activity of 9.14 × 104 g PMMA/mol·Cu·h at 60 °C and afforded syndiotactic poly (methylmethacrylate) (rr = 0.69).

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3‐(Pyridin‐2‐yl)imidazo[1,5‐a]pyridine (Pyridylindolizine) as Ligand in Complexes of Transition and Main‐Group Metals

et al. 2015

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Keywords: Chelate complexes / N ligands / Ligand effects / Ligand design / D-block metalsThe coordination of the easily prepared 3-(pyridin-2-yl)imidazo[1,5-a]pyridine (pyridylindolizine, Py-indz) ligand to several metal moieties was studied, and its electronic properties, similar to those of the classical ligands 2,2Ј-bipyridine (bipy) and 1,10-phenanthroline (phen), are reported. The new complexes were prepared and fully characterized by Xray crystallography and other typical spectroscopic methods if possible. Paramagnetic complexes [Ni(S 2 X) 2 (Py-indz)] X = P(OEt) 2 (1), COEt (2) (7) have the magnetic moment expected for a metallic cation with two or five unpaired electrons. Diamagnetic complexes show NMR spectra with similar patterns with small differences depending on the com-

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Synthesis and crystal structure determination of Mn(II) Schiff base complexes and their performance in ethene polymerization

Cited by 10 publications

References 37 publications

Zinc (II), palladium (II) and cadmium (II) complexes containing 4‐methoxy‐N‐(pyridin‐2‐ylmethylene) aniline derivatives: Synthesis, characterization and methyl methacrylate polymerization

Zinc (II), palladium (II) and cadmium (II) complexes containing 4‐methoxy‐N‐(pyridin‐2‐ylmethylene) aniline derivatives: Synthesis, characterization and methyl methacrylate polymerization

Five‐coordinate dinuclar cobalt (II), copper (II), zinc (II) and cadmium (II) complexes with 4‐bromo‐N‐(2‐pyridinylmethylene)benzenamine: Synthesis, characterisation and methyl methacrylate polymerization

3‐(Pyridin‐2‐yl)imidazo[1,5‐a]pyridine (Pyridylindolizine) as Ligand in Complexes of Transition and Main‐Group Metals

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