ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
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Dicobaloxime/organodicobaloximes bridged by different axial groups: synthesis, characterization, spectroscopy, and catalysis

Ahmet Kilic, Hamza Fırat, Emine Aytar, Mustafa Durgun, Aysegul Kutluay Baytak, Mehmet Aslanoglu, and Mahmut Ulusoy

Department of Chemistry, Faculty of Arts and Sciences, Harran University, Şanlıurfa, Turkey

 

E-mail: kilica63@harran.edu.tr

Abstract: In this study, the various ligands axially coordinated to two cobalt center bound to the N4-oxime core in 12 new dicobaloxime/organodicobaloxime (1–12) complexes have been synthesized and characterized by NMR (1H and 13C), UV–Visible, FT-IR, LC–MS, molar conductivity analysis, melting point, and magnetic susceptibility experiments with elemental analysis. These spectroscopic results indicate that the formation of new dicobaloxime/organodicobaloxime (112) complexes. The (C=N–OH) peaks disappeared in the 1H-NMR spectrum of dicobaloxime/organodicobaloxime (112) complexes, while new peaks were observed at range 20.18–18.33 ppm, indicating that the groups of ligands have been transformed to intramolecular H-bridge (O–H⋯O). The dicobaloxime (16) species give a better cyclic voltammogram as compared to its organodicobaloxime derivatives (712) due to cyclic voltammograms of the organodicobaloximes (712) were poor. This is possibly due to the enhanced σ donation by R groups in the organocobaloximes which are substantially stabilized. The organodicobaloxime (10) showed much better catalytic activity compared to the other cobaoxime complexes.

Keywords: Co(III) complexes; Dicobaloxime; Organodicobaloxime; Cyclic voltammetry; Cyclic carbonates; CO2 fixation; Reaction parameters

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-017-0165-0

 

Chemical Papers 71 (9) 1705–1720 (2017)

Friday, September 18, 2020

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