A New Molecular Adduct For The Preparation Of TiClx/MgCl2 Catalyst ...

MgCl2·4((CH3)2CHCH2OH): A new molecular adduct for the preparation of TiClx/MgCl2catalyst for olefinpolymerization

K. S. Thushara,a Edwin S. Gnanakumar,a Renny Mathew,b T. G. Ajithkumar,b P. R. Rajamohanan,b Sumit Bhaduri*c and Chinnakonda S. Gopinath*ad Author affiliations

* Corresponding authors

a Catalysis Division, CSIR – National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411 008, India E-mail: [email protected] Fax: +0091-20-25902633

b Central NMR Facility, CSIR – National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411 008, India

c Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai 400 071, India E-mail: [email protected]

d Centre of Excellence on Surface Science, CSIR – National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411 008, India

Abstract

A new molecular adduct of MgCl2 with isobutanol, namely MgCl2·4((CH3)2CHCH2OH) (MgiBOH), has been prepared as a precursor to the supporting material for an olefin polymerization catalyst. The MgiBOH adduct and final titanated Ziegler–Natta catalysts have been thoroughly characterized by powder XRD, thermal analysis, Raman spectroscopy and solid-state NMR for structural and spectroscopy aspects. A peak observed at 712 cm−1 in the Raman spectra of MgiBOH indicates the characteristic Mg–O6 breathing mode and the formation of the adduct. The diffraction feature at 2θ = 7.8° (d = 11.223 Å) in the XRD confirms the adduct formation and the layered structure. The aim of the present article is to study how the insertion of a bulky isobutanol moiety affects the structural and electronic properties of the MgCl2·isobutanol molecular adduct. Indeed, the focus of the present study is to explore how the presence of isobutanol, in the initial molecular adduct, influences the final Z–N catalyst properties and its activity.

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