| Yazarlar |
Ahmet Kılıç
Harran Üniversitesi, Türkiye |
|
Mahmut Ulusoy
Türkiye |
|
Mustafa Durgun
Harran Üniversitesi, Türkiye |
|
Emine Aytar
Türkiye |
Öğr. Gör. Dr. Metin DAĞDEVİREN
Kastamonu Üniversitesi, Türkiye |
|
İsmail Yılmaz
İstanbul Teknik Üniversitesi, Türkiye |
| Özet |
| Herein we report the synthesis and characterization of a new series of synthesized mono- and trinuclear cobaloxime/organocobaloximes from ketone that act as catalysts for cyclic carbonate synthesis from CO2 and epoxides under appropriate conditions (2 h, 100 °C and 1.6 MPa pressure). These reactions were carried out with and without co-catalyst, namely, 4-dimethylaminopyridine (DMAP), pyridine (py), triethyl amine (NEt3) or triphenyl phosphine (PPh3). In the catalytic experiments, the 4-dimethylaminopyridine (DMAP) was used as co-catalyst, since the DMAP was a more active base with higher yield compared to other Lewis bases. In addition, various factors influencing the cycloaddition reaction, such as co-catalyst, temperature, CO2 pressure and reaction time, were investigated. A dioxime ligand (LH2) (1) was obtained in two steps from 4-methylpropiophenone as ketone. Reaction of CoCl2.6H2O with the dioxime ligand (LH2) (1) and 4-tertbutyl pyridine afforded six-coordinate mononuclear cobaloxime or organocobaloxime (2-3) complexes. The mononuclear cobaloxime or organocobaloxime (2-3) complexes were used as precursors for building trinuclear cobaloximes or organocobaloxime (4-11) complexes. All compounds were fully characterized by 1H and 13C NMR spectra, FT-IR spectra, UV-Vis spectra, molar conductivity measurements, melting point measurements, magnetic susceptibility measurements, and LC-MS spectroscopic studies as well as by cyclic voltammetry. © 2014 Elsevier B.V. All rights reserved. |
| Anahtar Kelimeler |
| Carbon dioxide | Cobaloxime | Cyclic carbonate | Electrochemistry | Spectroscopy |
| Makale Türü | Özgün Makale |
| Makale Alt Türü | SSCI, AHCI, SCI, SCI-Exp dergilerinde yayımlanan tam makale |
| Dergi Adı | JOURNAL OF ORGANOMETALLIC CHEMISTRY |
| Dergi ISSN | 0022-328X |
| Dergi Tarandığı Indeksler | SCI-Expanded |
| Makale Dili | Türkçe |
| Basım Tarihi | 09-2014 |
| Cilt No | 767 |
| Sayı | 1 |
| Sayfalar | 150 / 159 |
| Doi Numarası | 10.1016/j.jorganchem.2014.05.023 |
| Makale Linki | http://dx.doi.org/10.1016/j.jorganchem.2014.05.023 |
