Silicon containing new salicylaldimine Pd(II) and Co(II) metal complexes as efficient catalysts in transformation of carbon dioxide (CO2) to cyclic carbonates
| Autor: | Mahmut Ulusoy, Bekir Çetinkaya, Ahmet Kilic, Zeynep Tasci, Mustafa Durgun |
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| Rok vydání: | 2011 |
| Předmět: |
Chemistry
Aryl Organic Chemistry Inorganic chemistry Substituent Tetrahedral molecular geometry Biochemistry Magnetic susceptibility Catalysis Inorganic Chemistry Solvent Metal chemistry.chemical_compound visual_art Polymer chemistry Materials Chemistry visual_art.visual_art_medium Proton NMR Physical and Theoretical Chemistry |
| Zdroj: | Journal of Organometallic Chemistry. 696:1372-1379 |
| ISSN: | 0022-328X |
| DOI: | 10.1016/j.jorganchem.2011.01.005 |
| Popis: | 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, 1 H 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(L 3 ) 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(L 3 ) 2 ] and [Co(L 3 ) 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(L 3 ) 2 ] can be reused more than eight times with a minimal loss of its original catalytic activities. |
| Databáze: | OpenAIRE |
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