Vanadium(Iv) complexes with methyl-substituted 8-hydroxyquinolines: Catalytic potential in the oxidation of hydrocarbons and alcohols with peroxides and biological activity

Joanna Palion-Gazda, André Luz, Luis R. Raposo, Katarzyna Choroba, Jacek E. Nycz, Alina Bieńko, Agnieszka Lewińska, Karol Erfurt, Pedro V. Baptista, Barbara Machura, Alexandra R. Fernandes, Lidia S. Shul’pina, Nikolay S. Ikonnikov, Georgiy B. Shul’pin

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Abstract

Methyl-substituted 8-hydroxyquinolines (Hquin) were successfully used to synthetize five-coordinated oxovanadium(IV) complexes: [VO(2,6-(Me)2-quin)2 ] (1), [VO(2,5-(Me)2-quin)2 ] (2) and [VO(2-Me-quin)2 ] (3). Complexes 1–3 demonstrated high catalytic activity in the oxidation of hydrocarbons with H2 O2 in acetonitrile at 50 C, in the presence of 2-pyrazinecarboxylic acid (PCA) as a cocatalyst. The maximum yield of cyclohexane oxidation products attained was 48%, which is high in the case of the oxidation of saturated hydrocarbons. The reaction leads to the formation of a mixture of cyclohexyl hydroperoxide, cyclohexanol and cyclohexanone. When triphenylphosphine is added, cyclohexyl hydroperoxide is completely converted to cyclohexanol. Consideration of the regioand bond-selectivity in the oxidation of n-heptane and methylcyclohexane, respectively, indicates that the oxidation proceeds with the participation of free hydroxyl radicals. The complexes show moderate activity in the oxidation of alcohols. Complexes 1 and 2 reduce the viability of colorectal (HCT116) and ovarian (A2780) carcinoma cell lines and of normal dermal fibroblasts without showing a specific selectivity for cancer cell lines. Complex 3 on the other hand, shows a higher cytotoxicity in a colorectal carcinoma cell line (HCT116), a lower cytotoxicity towards normal dermal fibroblasts and no effect in an ovarian carcinoma cell line (order of magnitude HCT116 > fibroblasts > A2780).

Original languageEnglish
Article number6364
JournalMolecules
Volume26
Issue number21
DOIs
Publication statusPublished - 1 Nov 2021

Keywords

  • 8-hydroxyquinoline
  • Biological activity
  • Catalytic properties
  • Cytotoxicity studies
  • Vanadium(IV) complexes

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