Catalytic activity of a new dioxidomolybdenum() complex with a bipodal NO-donor ligand in sulfur compound oxidation

• Published in: New journal of chemistry Vol. 47; no. 3; pp. 14123 - 14133
• Main Authors: Machado, Paula M. A, Barreto, Juliana M, Motta, Ramon da S, Rodrigues, José Guilherme A, de Souza, Wladmir F, Maldonado, Igor A. V, Allão Cassaro, Rafael A, dos Santos, Gustavo R. C, Carneiro, Gabriel R. A, Pereira, Henrique M. G, D'Elia, Eliane, Horn, Adolfo, Lachter, Elizabeth Roditi
• Format: Journal Article
• Published: 31.07.2023
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/d2nj06227e

A new dinuclear dioxidomolybdenum( vi ) complex [(MoO 2 ) 2 (BPA) 2 (μ-O)] was synthesized by the reaction between the tridentate N 2 O-donor ligand N -(2-hydroxybenzyl)- N -(pyridin-2-ylmethyl)amine (HBPA) and molybdenum trioxide (MoO 3 ). This complex was analyzed by FT-IR, UV-visible, ESI-MS, elemental (CHN), thermogravimetric and electrochemical analyses. The crystal structure was solved by single crystal X-ray diffraction, which shows two non-equivalent molybdenum( vi ) ions bridge-coordinated by an oxido ligand. The complex was studied using DFT calculations, resulting in a molecular structure with a geometry similar to the one obtained by X-ray diffraction. The dinuclear dioxidomolybdenum( vi ) complex [(MoO 2 ) 2 (BPA) 2 (μ-O)] was evaluated as a catalyst in the reaction involving the oxidation of sulfur compounds, at 25 and 50 °C, using hydrogen peroxide as an oxidant and acetonitrile as a solvent. The catalyst is able to oxidize thioanisole, diphenyl sulfide and dibenzothiophene producing sulfoxide and sulfone with conversions of 94%, 76% and 27%, respectively. A new dinuclear dioxidomolybdenum( vi ) complex [(MoO 2 ) 2 (BPA) 2 (μ-O)] was synthesized and evaluated as a catalyst in the reaction involving the oxidation of sulfur compounds.