Work

The Role of Ligand Exchange in Salen Cobalt Complexes in the Alternating Copolymerization of Propylene Oxide and Carbon Dioxide

Year: 2024

Type: article

Abstract: A comparative study of the copolymerization of racemic propylene oxide (PO) with CO2 catalyzed by racemic (salcy)CoX (salcy = N,N′-bis(3,5-di-tert-butylsalicylidene)-1,2-diaminocyclohexane; X = perfluorobenzoate (OBzF5) or 2,4-dinitrophenoxy (DNP)) in the presence of a [PPN]Cl ([PPN] = bis(triphenylphosphine)iminium) cocatalyst is performed in bulk at 21 °C and a 2.5 MPa pressure of CO2. The increase in the nucleophilicity of an attacking anion results in the increase in the copolymerization rate. Racemic (salcy)CoX provides a high selectivity of the copolymerization, which can be higher than 99%, and the living polymerization mechanism. Poly(propylene carbonate) (PPC) with bimodal molecular weight distribution (MWD) is formed throughout copolymerization. Both modes are living and are characterized by low dispersity, while their contribution to MWD depends on the nature of the attacking anion. The racemic (salcy)CoDNP/[PPN]DNP system is found to be preferable for the production of PPC with a high yield and selectivity.

Source: International Journal of Molecular Sciences

DOI: 10.3390/ijms252010946

Authors: Sergey A. Rzhevskiy, Olga V. Shurupova, Andrey F. Asachenko, Anna V. Plutalova, Elena V. Chernikova, Irina P. Beletskaya

Institutions: Russian Academy of Sciences, A.V. Topchiev Institute of Petrochemical Synthesis, Lomonosov Moscow State University

Language: English

Topic: Carbon dioxide utilization in catalysis

Subfield: Process Chemistry and Technology

Field: Chemical Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,296

Funder: Lomonosov Moscow State University