Abstract
Nowadays, studies are carried out on the design and synthesis of new catalysts for olefin oligomerization and polymerization, which would contain non-toxic metals and at the same time show high catalytic activities. Complex compounds of transition metal ions such as Fe(II), Cr(III) and Zr(II) containing pyridine or quinoline as ligands show at least moderate catalytic activity in ethylene and propylene polymerizations. To investigate the catalytic activity of the complex containing pyridine ligands and quinoline derivatives, here we have synthesized the crystals of new bis(5-chloroquinolin-8-olato)-bis(pyridine)-cobalt(II) solvate. The synthesized cobalt(II) complex compound was tested in reactions of 2-chloro-2-propen-1-ol and norbornene oligomerizations. Our studies showed that bis(5-chloroquinolin-8-olato)-bis(pyridine)-cobalt(II) after activation by MMAO-12 catalyzes the formation of oligomers in nitrogen atmosphere, under atmospheric pressure and at room temperature. Bis(5-chloroquinolin-8-olato)-bis(pyridine)-cobalt(II) possesses moderate catalytic activity in the formation of norbornene oligomers process and low catalytic activity in 2-chloro-2-propen-1-ol oligomerization.
Highlights
Polymer materials are produced in the global industry by the free radical polymerization method or with the use of a catalyst containing a metal atom or cation[1,2]
The complex compound bis(5-chloroquinolin-8-olato)-bis(pyridine)-cobalt is known in the literature[10], but its polymorphic form has been synthesized by our group and its physicochemical and catalytic properties have been described in this report
It is the same chemical substance—one cobalt(II) cation bonded with two pyridine molecules and two 5-chloro-8-hydroxyquinoline anions but this complex occurs as different crystallographic form
Summary
Polymer materials are produced in the global industry by the free radical polymerization method or with the use of a catalyst containing a metal atom or cation[1,2]. The new generation of catalysts replacing Ziegler–Natta catalysts was metallocene compounds They were metallocene complex compounds of transition metal atoms or cations, usually containing cyclopentadienyl and its derivatives as ligands[5]. The search for more sustainable catalysts than metallocene compounds resulted in the discovery of post-metallocene catalysts These are complex compounds of transition metal ions, which catalyze oligomerization and polymerization reactions under low-pressure conditions[6]. Recent developments in post-metallocene catalysts have led to explore the complex compounds of transition metal ions such as Fe(II), Cr(III) and Zr(II) containing pyridine or quinoline as ligands, showing at least moderate catalytic activity in ethylene and propylene polymerizations[7,8,9]. The catalytic activity of bis(5-chloroquinolin-8-olato)-bis(pyridine)-cobalt(II) has been determined
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