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Investigating the active species in a [(R‐SN(H)S‐R)CrCl 3 ] ethene trimerization system: Mononuclear or dinuclear?

DOI: 10.1002/cctc.201901640 DOI Help

Authors: Bas Venderbosch (University of Amsterdam) , Jean-Pierre H. Oudsen (University of Amsterdam) , David J. Martin (University of Amsterdam) , Bas Bruin (University of Amsterdam) , Ties J. Korstanje (University of Amsterdam) , Moniek Tromp (University of Amsterdam; University of Groningen)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chemcatchem , VOL 12 , PAGES 881 - 892

State: Published (Approved)
Published: October 2019
Diamond Proposal Number(s): 15305

Open Access Open Access

Abstract: Cr‐catalyzed ethene trimerization is an industrially important process to produce 1‐hexene. Despite its industrial relevance, the changing oxidation state and the structural rearrangements of the metal center during the catalytic cycle remain unclear. In this study, we have investigated the active species in a [(R‐SN(H)S−R)CrCl3] (R=C10H21) catalyzed ethene trimerization system using a combination of spectroscopic techniques (XAS, EPR and UV/VIS) and DFT calculations. Reaction of the octahedral CrIII complex with modified methylaluminoxane (MMAO) in absence of ethene gives rise to the formation of a square‐planar CrII complex. In the presence of ethene (1 bar), no coordination was observed, which we attribute to the endergonic nature of the coordination of the first ethene molecule. Employing an alkyne as a model for ethene coordination leads to the formation of a dinuclear cationic CrIII alkyne complex. DFT calculations show that a structurally related dinuclear cationic CrIII ethene complex could form under catalytic conditions. Comparing a mechanism proceeding via mononuclear cationic CrII/CrIV intermediates to that proceeding via dinuclear cationic CrII/CrIII intermediates demonstrates that only the mechanism involving mononuclear cationic CrII/CrIV intermediates can correctly explain the observed product selectivity.

Journal Keywords: EPR spectroscopy; XAS spectroscopy; trimerization; chromium; reaction mechanisms

Subject Areas: Chemistry

Instruments: B18-Core EXAFS

Other Facilities: Swiss Light Source

Added On: 04/03/2020 15:28


Discipline Tags:

Catalysis Molecular Complexes Organic Chemistry Physical Chemistry Chemistry

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS)