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Two mononuclear cobalt(III) complexes exhibiting phenoxazinone synthase activity

Authors
  • Mahato, Mamata
  • Van Hecke, Kristof
  • Nayek, Hari Pada
Publication Date
Jan 01, 2018
Source
Ghent University Institutional Archive
Keywords
Language
English
License
Unknown
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Abstract

Two mononuclear cobalt(III) complexes, namely [LCo(tmtp)(H2O)]ClO4 center dot MeOH (1) (tmtp = tri(m-tolyl)phosphine) and [LCo(PPh3)(H2O)]PF6 (2), have been prepared from a polydentate ligand, N,N'-bis(3-methoxysalicylidehydene)cyclohexane-1,2-diamine (H2L). Standard analytical techniques such as elemental analysis and UV-visible and Fourier transform infrared spectroscopies were used to characterize both complexes. The solid-state molecular structures of both complexes were confirmed from single-crystal X-ray diffraction analysis. Structural analyses show that the Co(III) ion occupies the centre of a distorted octahedron in a complex cation: [LCo(tmtp) (H2O)](+) and [LCo(PPh3)(H2O)](+) for 1 and 2, respectively. Phenoxazinone synthase activities of both complexes were screened. Kinetic studies and other experimental observations reveal that the reaction follows rate saturation kinetics and proceeds through the formation of a catalyst (complex)-substrate adduct. The turnover number (K-cat) of complex 2 is 54.07 h(-1), exhibiting better catalytic activity compared to 1 (K-cat = 45.11 h(-1)).

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