Synthesis, characterization, and heterobimetallic cooperation in a titanium-chromium catalyst for highly branched polyethylenes

Shaofeng Liu; Alessandro Motta; Massimiliano Delferro; Tobin J. Marks

doi:10.1021/ja4039505

Synthesis, characterization, and heterobimetallic cooperation in a titanium-chromium catalyst for highly branched polyethylenes

Shaofeng Liu, Alessandro Motta, Massimiliano Delferro^*, Tobin J. Marks

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

90 Scopus citations

Abstract

A heterobimetallic catalyst, {Ti - Cr}, consisting of a constrained-geometry titanium olefin polymerization center (CGC^EtTi) covalently linked to a chromium bis(thioether)amine ethylene trimerization center (SNSCr) was synthesized and fully characterized. In ethylene homopolymerizations it affords linear low-density polyethylene with molecular weights as high as 460 kg·mol^-1 and exclusively n-butyl branches in conversion-insensitive densities of ∼18 branches/1000 carbon atoms, which are ∼17 and ∼3 times (conversion-dependent), respectively, those achieved by tandem mononuclear CGC^EtTi and SNSCr catalysts under identical reaction conditions.

Original language	English (US)
Pages (from-to)	8830-8833
Number of pages	4
Journal	Journal of the American Chemical Society
Volume	135
Issue number	24
DOIs	https://doi.org/10.1021/ja4039505
State	Published - Jun 19 2013

ASJC Scopus subject areas

General Chemistry
Biochemistry
Catalysis
Colloid and Surface Chemistry

Access to Document

10.1021/ja4039505

Cite this

@article{c3531f1204864dd4b3162c6a1bd982a7,

title = "Synthesis, characterization, and heterobimetallic cooperation in a titanium-chromium catalyst for highly branched polyethylenes",

abstract = "A heterobimetallic catalyst, {Ti - Cr}, consisting of a constrained-geometry titanium olefin polymerization center (CGCEtTi) covalently linked to a chromium bis(thioether)amine ethylene trimerization center (SNSCr) was synthesized and fully characterized. In ethylene homopolymerizations it affords linear low-density polyethylene with molecular weights as high as 460 kg·mol-1 and exclusively n-butyl branches in conversion-insensitive densities of ∼18 branches/1000 carbon atoms, which are ∼17 and ∼3 times (conversion-dependent), respectively, those achieved by tandem mononuclear CGCEtTi and SNSCr catalysts under identical reaction conditions.",

author = "Shaofeng Liu and Alessandro Motta and Massimiliano Delferro and Marks, {Tobin J.}",

year = "2013",

month = jun,

day = "19",

doi = "10.1021/ja4039505",

language = "English (US)",

volume = "135",

pages = "8830--8833",

journal = "Journal of the American Chemical Society",

issn = "0002-7863",

publisher = "American Chemical Society",

number = "24",

}

TY - JOUR

T1 - Synthesis, characterization, and heterobimetallic cooperation in a titanium-chromium catalyst for highly branched polyethylenes

AU - Liu, Shaofeng

AU - Motta, Alessandro

AU - Delferro, Massimiliano

AU - Marks, Tobin J.

PY - 2013/6/19

Y1 - 2013/6/19

N2 - A heterobimetallic catalyst, {Ti - Cr}, consisting of a constrained-geometry titanium olefin polymerization center (CGCEtTi) covalently linked to a chromium bis(thioether)amine ethylene trimerization center (SNSCr) was synthesized and fully characterized. In ethylene homopolymerizations it affords linear low-density polyethylene with molecular weights as high as 460 kg·mol-1 and exclusively n-butyl branches in conversion-insensitive densities of ∼18 branches/1000 carbon atoms, which are ∼17 and ∼3 times (conversion-dependent), respectively, those achieved by tandem mononuclear CGCEtTi and SNSCr catalysts under identical reaction conditions.

AB - A heterobimetallic catalyst, {Ti - Cr}, consisting of a constrained-geometry titanium olefin polymerization center (CGCEtTi) covalently linked to a chromium bis(thioether)amine ethylene trimerization center (SNSCr) was synthesized and fully characterized. In ethylene homopolymerizations it affords linear low-density polyethylene with molecular weights as high as 460 kg·mol-1 and exclusively n-butyl branches in conversion-insensitive densities of ∼18 branches/1000 carbon atoms, which are ∼17 and ∼3 times (conversion-dependent), respectively, those achieved by tandem mononuclear CGCEtTi and SNSCr catalysts under identical reaction conditions.

UR - http://www.scopus.com/inward/record.url?scp=84879390989&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84879390989&partnerID=8YFLogxK

U2 - 10.1021/ja4039505

DO - 10.1021/ja4039505

M3 - Article

C2 - 23734980

AN - SCOPUS:84879390989

SN - 0002-7863

VL - 135

SP - 8830

EP - 8833

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

IS - 24

ER -

Synthesis, characterization, and heterobimetallic cooperation in a titanium-chromium catalyst for highly branched polyethylenes

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

CCDC 954833: Experimental Crystal Structure Determination

Cite this

Synthesis, characterization, and heterobimetallic cooperation in a titanium-chromium catalyst for highly branched polyethylenes

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Datasets

CCDC 954833: Experimental Crystal Structure Determination

Cite this