A carboxylate-bridged Mn(II) compound with 6-methylanthranilate/bipy: oxidation of alcohols/alkenes and catalase-like activity

Kilic Y., Bolat S., KANİ İ.

JOURNAL OF COORDINATION CHEMISTRY, vol.71, no.15, pp.2293-2303, 2018 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 71 Issue: 15
  • Publication Date: 2018
  • Doi Number: 10.1080/00958972.2018.1469750
  • Journal Name: JOURNAL OF COORDINATION CHEMISTRY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2293-2303
  • Keywords: Manganese, complex, catalase, oxidation, catalysis, MANGANESE(II) COMPLEX, HYDROGEN-PEROXIDE, CATALYTIC-OXIDATION, EPOXIDATION, COPPER(II), MECHANISM, ALKENES, OLEFINS, ALKANES, MODELS
  • Anadolu University Affiliated: Yes

Abstract

A novel manganese compound, [Mn-2((1,3)-6-CH3-2-NH2C6H4COO)(2)(bipy)(4)](ClO4)(2) (bipy=2,2-bipyridine), was synthesized and used as a catalyst precursor in the oxidation of alkenes and primary alcohols to corresponding aldehydes, ketones, and acids. The six-coordinate compound has a binuclear structure in which two Mn(II) ions adopt a syn-anti (1,3)-bridging mode with two carboxylate groups and two chelated bipy ligands. The compound exhibits good activity in the oxidation of cyclohexene to 2-cyclohexene-1-one as the major product (93% conv. in 3h, 79.3% selectivity) and of cinnamyl alcohol to cinnamaldehyde as the major product with 46% selectivity (100% conv. in 1.5h) with tert-butyl hydroperoxide (TBHP) in acetonitrile at 70 degrees C. Furthermore, the catalase-like activity of the compound was studied in different solvents (acetonitrile, methanol, Tris-HCl buffer; TOF=29,910h(-1) in Tris-HCl buffer).