Ligand centered radical pathway in catechol oxidase activity with a trinuclear zinc-based model: synthesis, structural characterization and luminescence properties

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Sukanta PalBhaskar Biswas

Abstract

A new trinuclear zinc(II) complex, [Zn3(L)(NCS)2](NO3)2·CH3OH·H2O (1), of a (N,O)-donor compartmental Schiff base ligand (H2L=N,N'-bis(3-methoxysalicylidene)-1,3-diamino-2-propanol), has been synthesized in crystalline phase. The zinc(II) complex has been characterized by elemental analysis, IR spectroscopy, UV-Vis spectroscopy, powder X-ray diffraction study (PXRD), (1)H NMR, EI mass spectrometry and thermogravimetric analysis. PXRD revealed that 1 crystallizes in P-1 space group with a=9.218 Å, b=10.849 Å, c=18.339 Å, with unit cell volume is 2179.713(Å)(3). Fluorescence spectra in methanolic solution reflect that intensity of emission for 1 is much higher compared to H2L and both the compounds exhibit good fluorescence properties. The complex 1 exhibits significant catalytic activities of biological relevance, viz. catechol oxidase. In methanol, it efficiently catalyzes the oxidation of 3,5-di-tert-butylcatechol (3,5-DTBC) to corresponding quinone via formation of a dinuclear species as [Zn2(L)(3,5-DTBC)]. Electron Paramagnetic Resonance (EPR) experiment suggests generation of radicals in the presence of 3,5-DTBC and it may be proposed that the radical pathway is probably responsible for conversion of 3,5-DTBC to 3,5-DTBQ pr...Continue Reading

References

Nov 7, 1996·Chemical Reviews·William N. Lipscomb, Norbert Sträter
Oct 25, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Totan GhoshDebasis Das

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Citations

Oct 31, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Barnali NaskarSanchita Goswami
Oct 15, 2018·Photochemistry and Photobiology·Christopher GriecoBern Kohler
Feb 7, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Tonmoy ChakrabortyDebasis Das

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