Synthesis and characterisation of transition metal complexes of schiff bases derived from dithiocarbazate and application of these complexes as cyclohexane oxidation catalysts

Schiff bases and their complexes are excellent applicants’ compounds that are synthesized by the condensation of a primary amino compound with either ketones or aldehydes for a variety of industrial applications. They can act as catalysts for the catalytic oxidation of organic compounds. In recent y...

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主要作者:	Alshaheri, Ali Ahmed Qaid
格式:	Thesis
語言:	English
出版:	2019
主題:	Transition metal complexes Schiff bases
在線閱讀:	http://psasir.upm.edu.my/id/eprint/83185/1/FS%202019%2047%20ir.pdf
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spelling	my-upm-ir.831852022-01-10T03:24:32Z Synthesis and characterisation of transition metal complexes of schiff bases derived from dithiocarbazate and application of these complexes as cyclohexane oxidation catalysts 2019-06 Alshaheri, Ali Ahmed Qaid Schiff bases and their complexes are excellent applicants’ compounds that are synthesized by the condensation of a primary amino compound with either ketones or aldehydes for a variety of industrial applications. They can act as catalysts for the catalytic oxidation of organic compounds. In recent years, most of the researches in oxidation catalysis focused on how to employ the metal complexes-catalyzed oxidation of organic compounds. Schiff base complexes of transition metals can be used for catalytic oxidation of hydrocarbons in the presence of tert‑butyl hydroperoxide (TBHP) and hydrogen peroxide. The oxidation of cyclohexane is an important oxidation reaction for industrial applications as their products, cyclohexanone and cyclohexanol, also known as K-A oil, are very important to produce nylon 6,6 and nylon-6 polymers, plastics, lubricant additives, fibers and are intermediate for pharmaceuticals. In this work, dithiocarbazate Schiff bases derived from the condensation of S-methyldithiocabazate (SMDTC) and S-benzyldithiocarbazate (SBDTC) with 2,6-diacetylpyridine (diAP) and 1,3-diacetylbenzene (diAC), and their Ni(II), Cu(II), Fe(II), Co(II), Mn(II) and Zn(II) complexes have been successfully synthesized in ethanol and characterized using several physico-chemical techniques. The oxidation of cyclohexane by the prepared metal complexes as catalysts has been investigated in the presence of tert‑butylhydroperoxide (TBHP) and hydrogen peroxide as the oxidative source under mild conditions at 4h, 70°C, 0.09 mmol catalyst and 20 mmol oxidant. The product was analyzed using gas chromatography and it was found that cyclohexanol and cyclohexanone are the main products for the oxidation reaction. All the transition metal complexes of the Schiff bases showed activity toward oxidation of cyclohexane. Time of the reaction, temperature, and the concentration of TBHP and catalyst influenced the selectivity and conversion of the cyclohexane oxidation. The complex, [CuSBdiAC], was found to be the most active catalyst with ~50% conversion. Transition metal complexes Schiff bases 2019-06 Thesis http://psasir.upm.edu.my/id/eprint/83185/ http://psasir.upm.edu.my/id/eprint/83185/1/FS%202019%2047%20ir.pdf text en public doctoral Universiti Putra Malaysia Transition metal complexes Schiff bases Mohamed Tahir, Mohamed Ibrahim
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
advisor	Mohamed Tahir, Mohamed Ibrahim
topic	Transition metal complexes Schiff bases
spellingShingle	Transition metal complexes Schiff bases Alshaheri, Ali Ahmed Qaid Synthesis and characterisation of transition metal complexes of schiff bases derived from dithiocarbazate and application of these complexes as cyclohexane oxidation catalysts
description	Schiff bases and their complexes are excellent applicants’ compounds that are synthesized by the condensation of a primary amino compound with either ketones or aldehydes for a variety of industrial applications. They can act as catalysts for the catalytic oxidation of organic compounds. In recent years, most of the researches in oxidation catalysis focused on how to employ the metal complexes-catalyzed oxidation of organic compounds. Schiff base complexes of transition metals can be used for catalytic oxidation of hydrocarbons in the presence of tert‑butyl hydroperoxide (TBHP) and hydrogen peroxide. The oxidation of cyclohexane is an important oxidation reaction for industrial applications as their products, cyclohexanone and cyclohexanol, also known as K-A oil, are very important to produce nylon 6,6 and nylon-6 polymers, plastics, lubricant additives, fibers and are intermediate for pharmaceuticals. In this work, dithiocarbazate Schiff bases derived from the condensation of S-methyldithiocabazate (SMDTC) and S-benzyldithiocarbazate (SBDTC) with 2,6-diacetylpyridine (diAP) and 1,3-diacetylbenzene (diAC), and their Ni(II), Cu(II), Fe(II), Co(II), Mn(II) and Zn(II) complexes have been successfully synthesized in ethanol and characterized using several physico-chemical techniques. The oxidation of cyclohexane by the prepared metal complexes as catalysts has been investigated in the presence of tert‑butylhydroperoxide (TBHP) and hydrogen peroxide as the oxidative source under mild conditions at 4h, 70°C, 0.09 mmol catalyst and 20 mmol oxidant. The product was analyzed using gas chromatography and it was found that cyclohexanol and cyclohexanone are the main products for the oxidation reaction. All the transition metal complexes of the Schiff bases showed activity toward oxidation of cyclohexane. Time of the reaction, temperature, and the concentration of TBHP and catalyst influenced the selectivity and conversion of the cyclohexane oxidation. The complex, [CuSBdiAC], was found to be the most active catalyst with ~50% conversion.
format	Thesis
qualification_level	Doctorate
author	Alshaheri, Ali Ahmed Qaid
author_facet	Alshaheri, Ali Ahmed Qaid
author_sort	Alshaheri, Ali Ahmed Qaid
title	Synthesis and characterisation of transition metal complexes of schiff bases derived from dithiocarbazate and application of these complexes as cyclohexane oxidation catalysts
title_short	Synthesis and characterisation of transition metal complexes of schiff bases derived from dithiocarbazate and application of these complexes as cyclohexane oxidation catalysts
title_full	Synthesis and characterisation of transition metal complexes of schiff bases derived from dithiocarbazate and application of these complexes as cyclohexane oxidation catalysts
title_fullStr	Synthesis and characterisation of transition metal complexes of schiff bases derived from dithiocarbazate and application of these complexes as cyclohexane oxidation catalysts
title_full_unstemmed	Synthesis and characterisation of transition metal complexes of schiff bases derived from dithiocarbazate and application of these complexes as cyclohexane oxidation catalysts
title_sort	synthesis and characterisation of transition metal complexes of schiff bases derived from dithiocarbazate and application of these complexes as cyclohexane oxidation catalysts
granting_institution	Universiti Putra Malaysia
publishDate	2019
url	http://psasir.upm.edu.my/id/eprint/83185/1/FS%202019%2047%20ir.pdf
_version_	1747813356363841536

Synthesis and characterisation of transition metal complexes of schiff bases derived from dithiocarbazate and application of these complexes as cyclohexane oxidation catalysts

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