Synthesis of Fe and Cu metal complexes derived from 'SNS' Pincer type ligands and their efficient catalyst precursors for the chemical fixation of

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SOĞUKÖMEROĞULLARI H. G., YALÇIN Ş., CEYLAN Ü., AYTAR E., AYGÜN M., Richeson D. S., ...More

JOURNAL OF CHEMICAL SCIENCES, vol.131, no.4, 2019 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 131 Issue: 4
  • Publication Date: 2019
  • Doi Number: 10.1007/s12039-019-1609-6
  • Journal Name: JOURNAL OF CHEMICAL SCIENCES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: SNS pincer complexes, CO2, catalysts, single crystal X-ray diffraction, density Functional Theory, DENSITY-FUNCTIONAL THEORY, SPECTROSCOPIC FT-IR, CARBON-DIOXIDE, CYCLIC CARBONATES, COPPER(II) COMPLEXES, COBALOXIME/ORGANOCOBALOXIME CATALYSTS, STRUCTURAL MODEL, SALEN COMPLEXES, IONIC LIQUID, CO2
  • Dokuz Eylül University Affiliated: Yes

Abstract

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 and metal salts. Two new unanticipated complexes were obtained from the L2 ligand, the dimeric bidentate Cu(I) complex and tridentate Fe(II) complex while two new tridentate pincer-type complexes M(-L1)] () were formed from the L1 ligand. It was observed that the structure of this Cu(I) complex has a tetrahedral geometry using single crystal X-ray diffraction analysis. In addition, catalytic properties of metal complexes towards the formation of cyclic carbonates from and epoxides were investigated. The less sterically hindered Fe(II) complex with the L1 ligand (2) showed the best catalytic activity. Several parameters including temperature, time, epoxide identity and pressure were investigated to find the optimum catalytic reaction conditions. Moreover, DFT studies of these compounds are presented in the study.