Jump to main content
Jump to site search

Issue 36, 2013
Previous Article Next Article

Synthesis and characterization of Co(iii) amidoamine complexes: influence of substituents of the ligand on catalytic cyclic carbonate synthesis from epoxide and carbon dioxide

Author affiliations

Abstract

A series of amidoamine ligands (1) and their cobalt(III) complexes (2) were synthesized and characterized by various spectroscopic techniques including 1H-NMR and X-ray crystallographic techniques. X-ray crystallography shows that one of the complexes, 2a, forms a chiral coordination polymer due to bridge formation with Li+ associated with the complex, although the ligand is achiral. Complex 2 was employed for catalytic synthesis of cyclic carbonates from epoxides and carbon dioxide (CO2) in a solvent free condition. A strong influence of the substituents on the ligand 1 was revealed by the varied activity of complex 2. The presence of electron withdrawing groups such as chloro (2b) and nitro (2c) increases the Lewis acidity of the catalyst, which, in turn, enhances the catalytic activity of 2. An electron withdrawing group containing complexes (2b and 2c) showed exceptionally high catalytic activity with a turnover frequency (TOF) of 662 and 602 h−1 respectively at 130 °C and 300 psig CO2 pressure. On the other hand, our studies indicate that a catalyst with an electron releasing group (2d) showed relatively lower activity with a TOF of 488 h−1 under similar reaction conditions. Our results show that cobalt(III) complexes follow the reactivity order of 2d < 2a < 2c < 2b.

Graphical abstract: Synthesis and characterization of Co(iii) amidoamine complexes: influence of substituents of the ligand on catalytic cyclic carbonate synthesis from epoxide and carbon dioxide

Back to tab navigation

Supplementary files

Publication details

The article was received on 23 May 2013, accepted on 06 Jul 2013 and first published on 09 Jul 2013


Article type: Paper
DOI: 10.1039/C3DT51352A
Dalton Trans., 2013,42, 13151-13160

  •   Request permissions

    Synthesis and characterization of Co(III) amidoamine complexes: influence of substituents of the ligand on catalytic cyclic carbonate synthesis from epoxide and carbon dioxide

    P. Ramidi, N. Gerasimchuk, Y. Gartia, C. M. Felton and A. Ghosh, Dalton Trans., 2013, 42, 13151
    DOI: 10.1039/C3DT51352A

Search articles by author

Spotlight

Advertisements