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Two mononuclear cobalt(III) complexes exhibiting phenoxazinone synthase activity

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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)).
Keywords
cobalt(III) complex, phenoxazinone synthase activity, Schiff base, single-crystal X-ray diffraction, turnover number, SCHIFF-BASE COMPLEXES, MIMICKING ACTIVITY, CRYSTAL-STRUCTURE, COORDINATION CHEMISTRY, BIOLOGICAL-ACTIVITIES, MAGNETIC-PROPERTIES, LIGANDS, SUBSTITUTION, LUMINESCENT, BEHAVIOR

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Citation

Please use this url to cite or link to this publication:

Chicago
Mahato, Mamata, Kristof Van Hecke, and Hari Pada Nayek. 2018. “Two Mononuclear cobalt(III) Complexes Exhibiting Phenoxazinone Synthase Activity.” Applied Organometallic Chemistry 32 (5).
APA
Mahato, M., Van Hecke, K., & Nayek, H. P. (2018). Two mononuclear cobalt(III) complexes exhibiting phenoxazinone synthase activity. APPLIED ORGANOMETALLIC CHEMISTRY, 32(5).
Vancouver
1.
Mahato M, Van Hecke K, Nayek HP. Two mononuclear cobalt(III) complexes exhibiting phenoxazinone synthase activity. APPLIED ORGANOMETALLIC CHEMISTRY. 2018;32(5).
MLA
Mahato, Mamata, Kristof Van Hecke, and Hari Pada Nayek. “Two Mononuclear cobalt(III) Complexes Exhibiting Phenoxazinone Synthase Activity.” APPLIED ORGANOMETALLIC CHEMISTRY 32.5 (2018): n. pag. Print.
@article{8581226,
  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)).},
  articleno    = {e4336},
  author       = {Mahato, Mamata and Van Hecke, Kristof and Nayek, Hari Pada},
  issn         = {0268-2605},
  journal      = {APPLIED ORGANOMETALLIC CHEMISTRY},
  keywords     = {cobalt(III) complex,phenoxazinone synthase activity,Schiff base,single-crystal X-ray diffraction,turnover number,SCHIFF-BASE COMPLEXES,MIMICKING ACTIVITY,CRYSTAL-STRUCTURE,COORDINATION CHEMISTRY,BIOLOGICAL-ACTIVITIES,MAGNETIC-PROPERTIES,LIGANDS,SUBSTITUTION,LUMINESCENT,BEHAVIOR},
  language     = {eng},
  number       = {5},
  pages        = {8},
  title        = {Two mononuclear cobalt(III) complexes exhibiting phenoxazinone synthase activity},
  url          = {http://dx.doi.org/10.1002/aoc.4336},
  volume       = {32},
  year         = {2018},
}

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