Silicon containing new salicylaldimine Pd(II) and Co(II) metal complexes as efficient catalysts in transformation of carbon dioxide (CO2) to cyclic carbonates |
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| Authors: | Mahmut Ulusoy Ahmet Kilic Mustafa Durgun Bekir Cetinkaya |
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| Affiliation: | a Department of Chemistry, University of Harran, 63190 Sanliurfa, Turkey
b Department of Chemistry, Ege University, 35100 Bornova, Izmir, Turkey |
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| Abstract: | A new series of metal complexes of salicyladimine ligands with Pd(II) and Co(II) have been prepared and characterized by different techniques (elemental analysis, UV-vis, FT-IR, 1H NMR spectra, magnetic susceptibility measurements). Electronic spectra and magnetic susceptibility measurements reveal square planar geometry for Pd(II) metal complex and tetrahedral geometry for Co(II) metal complex. The synthesized Pd(II) and Co(II) complexes were also tested as catalysts for the formation of cyclic organic carbonates from carbon dioxide and liquid epoxides which served as both reactant and solvent. The results showed that the [M(L3)2] (M = Pd or Co) complexes bearing 5-methyl substituent on the aryl ring are more efficient than the other Pd(II) and Co(II) metal complexes for the formation of cyclic organic carbonates from carbon dioxide. These catalysts, [Pd(L3)2] and [Co(L3)2] complexes and location (p-position of phenoxy) of electron donating methyl substituent in particular, effectively promote the of carbon dioxide activation with liquid epoxides under solvent-free homogeneous conditions. Furthermore, [Pd(L3)2] can be reused more than eight times with a minimal loss of its original catalytic activities. |
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| Keywords: | Pd(II) complex Catalyst Carbon dioxide Salicylaldimine Cyclic carbonate |
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