Electronic effects of aromatic rings on the catalytic activity of ‎dioxidomolybdenum(VI)-hydrazone complexes

Bikas, Rahman and Lippolis, Vito and Noshiranzadeh, Nader and Farzaneh-Bonab, Hossein and Blake, Alexander J. and Siczek, Milosz and Hosseini-Monfared, Hassan and Lis, Tadeusz (2016) Electronic effects of aromatic rings on the catalytic activity of ‎dioxidomolybdenum(VI)-hydrazone complexes. European Journal of Inorganic Chemistry . ISSN 1099-0682 (In Press)

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Abstract

Nine dioxidomolybdenum(VI) complexes were synthesized by the ‎reaction of MoO3 with tridentate hydrazone Schiff base ligands ‎obtained from the reaction of aromatic acid hydrazides (3-hydroxy-2-‎naphthoic acid hydrazide, 4-pyridine carboxylic acid hydrazide or 2-‎furane carboxylic acid hydrazide) and ortho-hydroxy aldehyde ‎derivatives (5-iodo-2-hydroxybenzaldehyde, 2-hydroxy-1-‎naphthaldehyde or 2-hydroxy-3-methoxybenzaldehyde). All ligands ‎and complexes were characterized by elemental analysis and ‎spectroscopic methods. The structures of seven complexes were ‎further elucidated by single-crystal X-ray diffraction analysis which ‎indicated a distorted octahedral geometry at the metal centre. ‎Spectroscopic and X-ray analyses indicated that the ligands are ‎coordinated to the molybdenum(VI) ion as dinegative ligands due to ‎deprotonation of phenolic OH and amidic NH groups upon ‎complexation. These complexes were used as catalyst in ‎the oxidation of cyclooctene and thioanisol in the presence of ‎hydrogen peroxide as environmental friendly oxidant. In order to ‎achieve the highest catalytic activity, the effects of important ‎parameters such as solvent, temperature and the molar ratio of ‎oxidant to substrate were optimized. The results indicate that ‎electron-withdrawing substituents on the ligands increase the ‎catalytic activity of dioxidomolybdenum(VI)-hydrazone complexes.‎

Item Type: Article
Additional Information: This is the peer reviewed version of the following article: Electronic effects of aromatic rings on the catalytic activity of ‎dioxidomolybdenum(VI)-hydrazone complexes / Rahman Bikas1, Vito Lippolis, Nader Noshiranzadeh, Hossein Farzaneh-Bonab‎, Alexander J. ‎ Blake, Milosz Siczek‎, Hassan Hosseini-Monfared‎ and Tadeusz Lis, which has been published in final form at http://dx.doi.org/10.1002/ejic.201601359. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Chemistry
Identification Number: https://doi.org/10.1002/ejic.201601359
Depositing User: Bramwell, Roseanna
Date Deposited: 16 Dec 2016 14:59
Last Modified: 18 Dec 2016 03:54
URI: http://eprints.nottingham.ac.uk/id/eprint/39391

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