Cd(II) and Zn(II) Complexes Containing N,N'-Bidentate N-(Pyridin-2-ylmethylene)cyclopentanamine: Synthesis, Characterisation and Methyl Methacrylate Polymerisation

Abstract

The reaction between [CdBr 2 ·4H 2 O] and anhydrous [ZnCl 2 ] with N,N'-bidentate N-(pyridin-2-ylmethylene)-cyclopentanamine (impy) in ethanol yields dimeric [(impy)Cd(µ-Br)Br] 2 and monomeric [(impy)ZnCl 2 ] complexes, respectively. The X-ray crystal structure of Cd(II) and Zn(II) complexes revealed that the cadmium atom in [(impy)Cd(µ-Br)Br] 2 and zinc in [(impy)ZnCl 2 ] formed a distorted trigonal-bipyramidal and tetrahedral geometry, respectively. Both complexes showed moderate catalytic activity for the polymerisation of methyl methacrylate (MMA) in the presence of modified methylaluminoxane (MMAO), with polymethylmethacrylate (PMMA) syndiotacticity of about 0.70.

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

“…It is evident that using [(L) n MX 2 ] m (L = L‐a–L‐c; M = Zn, Pd; X = Cl; M = Cd; X = Br; n , m = 1 or 2) as a polymerization catalyst, [(L‐b)PdCl 2 ] exhibited the highest catalytic activity (3.80 × 10 4 g PMMA mol −1 Pd hr −1 ). The current results are consistent with our previously reported Zn (II), Pd (II) and Cd (II) initiators bearing N ‐substituted 2‐iminoalkylpyridines for MMA polymerization, where the iminopyridine effectively creates electron‐rich clouds around the palladium metal but does not affect Cd (II) and Zn (II) complexes …”

“…Recently, we have studied Zn (II), Cd (II), Co (II), Pt (II) and Pd (II) complexes with N , N ‐di(2‐picolyl) amine, 2‐iminomethylpyridine, N ‐methyl‐ N ‐((pyridin‐2‐yl)methyl) cyclohexanamine, N ‐(pyridin‐2‐ylmethyl) aniline and N , N ‐di(2‐picolyl) cycloalkylamine ligands in MMA polymerization with promising results, as a slight difference in ligand architecture is able to influence the stereoregular outcomes during polymerization reactions. Thus, suitable ligand architecture around the metal center is vital for achieving a high degree of polymerization as these complexes/initiators regulate various steps involved in polymerization .…”

Well-Controlled Emulsion Polymerization of Methyl Methacrylate Using (Hg,Cd)-Diphenylcarbazone Catalysts: An attempt to Create Hg-free, Nontoxic, γ-Radiation and thermal Stable Films

“…Organometallic compounds that comprise of IIB metals are amusing because they own interesting coordination forms and structural features which come from d 10 conformation [9]. Several Cd and Zn complexes have been investigated in the eld of MMA polymerization [10][11][12][13][14][15][16]. Previously the effectiveness of alkyl-and aryl-Zn and Cd compounds in polymerization of MMA was investigated [10].…”

“…Previously the effectiveness of alkyl-and aryl-Zn and Cd compounds in polymerization of MMA was investigated [10]. Recently, Cd and Zn complexes containing ancillary ligands, pyridyl-imines and N-substituted 2-iminoalkylpyridines have been applied for MMA polymerization [11][12][13][14][15][16]. N,N-di(2-picolyl) cyclohexylamine based Zn (II), and Cd(II) complexes were found to be active catalysts for the MMA polymerization to produce syndiotactic PMMA [11].…”

Stereoselective polymerization of methyl methacrylate and rac-lactide mediated by iminomethylpyridine based Cu(ii) complexes

“…These catalysts were effective and afforded high-molecularweight PLAs and PMMAs with mediocre to high syndiotacticities. [33][34][35][36][37][38] As an extension of our continuous interest in the stereoselective ROP of rac-LA and MMA polymerization, we synthesized Cu(II) complexes ligated to iminomethylpyridine derivatives and investigated their catalytic efficacy in MMA and rac-LA polymerization in this study.…”