DARRIN S RICHESON
Articles written in Journal of Chemical Sciences
Volume 131 Issue 4 April 2019 Article ID 0032
Two novel tridentate SNS pincer type ligands, 2,6-bis[[(2'-methoxyphenyl)thio]methyl]pyridine (L1) and 2,6-bis[[(2'-chlorophenyl)thio]methyl]pyridine (L2), each possessing two sulfur and one nitrogen donor functionalities (SNS), based on 2,6-bis(thioether)pyridine ligands were prepared and metallised with CuCl2 · 2H2O and FeCl2 · 4H2O metal salts. Two new unanticipated complexes were obtained from the L,2 ligand, the dimeric bidentate Cu(I) complex [Cu2(κ2−L2)2Cl2] and tridentate Fe(II) complex [Fe(κ3−L2)Cl2] while two new tridentate pincer-type complexes M(κ3-L1)Cl2] (M = Cu, Fe) were formed from the L1 ligand It was observed that the structure of this Cu(I) complex has a tetrahedral geometry using single crystal Xray diffraction analysis. In addition, catalytic properties of metal complexes towards the formation of cyclic carbonates from CO2 and epoxides were investigated. The less sterically hindered Fe(II) complex with theL1 ligand [Fe(κ3−L1)Cl2] (2) showed the best catalytic activity. Several parameters including temperature, time, epoxide identity and CO2 pressure were investigated to find the optimum catalytic reaction conditions. Moreover, DFT studies of these compounds are presented in the study.
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