1. A three-dimensional manganese(II) coordination polymer: synthesis, structure and catecholase activity.
- Author
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Bhattacherjee, Prama, Mitra, Partha, Sarkar, Prasenjit, and John, Rohith P.
- Subjects
COORDINATION polymers synthesis ,COORDINATION polymers ,MANGANESE ,ELECTRON paramagnetic resonance ,ELECTRON paramagnetic resonance spectroscopy ,ULTRAVIOLET-visible spectroscopy - Abstract
A manganese-based coordination polymer, [Mn
2 L2 (µ-MeOH)2 ]n (H2 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 (L2− ) is bound via ONO donor sites to manganese(II). Two such [ML] fragments are connected by µ2 -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 [Mn2 L2 (µ-MeOH)2 ]n . 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 MnIII /MnII 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 (kcat ) 27.22 h−1 . [ABSTRACT FROM AUTHOR]- Published
- 2020
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