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A three-dimensional manganese(II) coordination polymer: synthesis, structure and catecholase activity.
- Source :
- Journal of Coordination Chemistry; Feb2020, Vol. 73 Issue 3, p360-374, 15p, 4 Diagrams, 3 Charts, 5 Graphs
- Publication Year :
- 2020
-
Abstract
- A manganese-based coordination polymer, [Mn<subscript>2</subscript>L<subscript>2</subscript>(µ-MeOH)<subscript>2</subscript>]<subscript>n</subscript> (H<subscript>2</subscript>L = 2-hydroxy-1-naphthaldehyde isonicotinoylhydrazone) was obtained by self-assembly of 2-hydroxy-1-naphthaldehyde isonicotinoylhydrazone and manganese(II) acetate. The coordination polymer was characterized by IR, EPR and UV–Vis spectroscopy. The single-crystal X-ray diffraction study reveals that the dibasic tridentate ligand (L<superscript>2−</superscript>) is bound via ONO donor sites to manganese(II). Two such [ML] fragments are connected by µ<subscript>2</subscript>-bridged methanol (MeOH) to form a di-manganese species. The sixth site of each of the manganese is occupied by the pyridyl N atom of the isonicotinoyl group. This arrangement gives a polynuclear complex of the formula [Mn<subscript>2</subscript>L<subscript>2</subscript>(µ-MeOH)<subscript>2</subscript>]<subscript>n</subscript>. The coordination geometry of manganese is distorted octahedral. The X-band electron paramagnetic resonance (EPR) measurement of the complex at 77 K shows a six-line spectrum and a signal at the half field, with g = 4.88. The half-field signal indicates the dimeric nature of the complex in the solution state. The cyclic voltammetric measurement of the complex shows a reversible Mn<superscript>III</superscript>/Mn<superscript>II</superscript> redox couple. The complex catalyzes the conversion of 3,5-di-tert-butyl catechol to the corresponding o-quinone with a catalytic turnover rate of (k<subscript>cat</subscript>) 27.22 h<superscript>−1</superscript>. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00958972
- Volume :
- 73
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Journal of Coordination Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 142554723
- Full Text :
- https://doi.org/10.1080/00958972.2020.1740213