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Author

Lah, Myoung Soo
Nanoporous Materials Lab
Research Interests
  • Metal-Organic Frameworks (MOFs)

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Structure and Heme-Independent Peroxidase Activity of a Fully-Coordinated Mononuclear Mn(II) Complex with a Schiff-Base Tripodal Ligand Containing Three Imidazole Groups

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Title
Structure and Heme-Independent Peroxidase Activity of a Fully-Coordinated Mononuclear Mn(II) Complex with a Schiff-Base Tripodal Ligand Containing Three Imidazole Groups
Author
Sarkar, ShuranjanMoon, DohyunLah, Myoung SooLee, Hong-In
Keywords
Antioxidant; Complex 1; Complex ions; Crystallographic studies; EPR spectroscopy; Imidazolate; Imidazole group; Imidazolyl; Octahedral geometry; Peroxidase activities; Schiff bases; Schiff-base; Seven coordination; Sulfonic acid; Tertiary amine; Tripodal ligands; Two layers
Issue Date
201011
Publisher
KOREAN CHEMICAL SOC
Citation
BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.31, no.11, pp.3173 - 3179
Abstract
New complex [Mn(II)H-1 L-5](2)[Mn(II)H3L](2)(ClO4)(5) 3H(2)O (1), where H3L is tris{2-(4-imidazolyl)methyliminoethyl} amine (imtren), has been prepared by reacting manganese(II) perchlorate hexahydrate with the imtren ligand in methanol X-ray crystallographic study revealed that the imtren ligand hexadentately binds to Mn(II) ion through the three Schiff-base imine N atoms and three imidazole N atoms with a distorted octahedral geometry and the apical tertiary amine N atom of the ligand pseudo-coordinates to Mn(II), forming overall a pseudo-seven coordination environment The hydrogen-bonds between imidazole and imidazolate of [Mn(II)H-1 L-5] (0 5+) complex ions are extended to build a 2D puckered network with trigonal voids [Mn(II)H3L](2+) complex ions constitutes another extended 2D puckered layer without hydrogen bonds Two layers are wedged each other to constitute overall stack of the crystal Peroxidase activity of complex 1 was examined by observing the oxidation of 2,2'-azinobis(3-ethyl-benzothiazoline)-6-sulfonic acid (ABTS) with hydrogen peroxide in the presence of complex 1 Generation of ABTS(+) was observed by UV-vis and EPR spectroscopies indicating that the complex 1, a fully-coordinated mononuclear Mn(II) complex with nitrogen-only ligand, has a heme-independent peroxidase activity.
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DOI
http://dx.doi.org/10.5012/bkcs.2010.31.11.3173
ISSN
0253-2964
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