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Chelating behavior of 2-hydroxyacetophenone N(4)-disubstituted thiosemicarbazones: Facile formation of Mn(IV) complexes – X-ray structure, EPR and cyclic voltammetric studies
- Source :
-
Polyhedron . Mar2005, Vol. 24 Issue 5, p601-610. 10p. - Publication Year :
- 2005
-
Abstract
- Abstract: Reaction of tridentate ONS donor ligands H2L1, H2L2 and H2L3 (H2L1 =2-hydroxyacetophenone hexamethyleneimine-3-thiosemicarbazone; H2L2 =2-hydroxyacetophenone morpholine-3-thiosemicarbazone; H2L3 =2-hydroxyacetophenone N(4)-methyl, phenyl thiosemicarbazone) with Mn(OAc)2 ·4H2O afforded manganese(IV) complexes of the type [MnL2] in an ethanol–methanol mixture under air. The crystal structure of Mn(L2)2 ·0.25H2O reveals an octahedral geometry with the ligand coordinated in a meridional fashion. The molecule is packed in the crystal lattice with extended hydrogen bonding networks. EPR spectra of the complexes in frozen solution at 77K show a weak signal at g ≈4 and a strong sextet at g ≈2 consistent with manganese(IV) in an octahedral environment. Cyclic voltammetry in DMSO/ dichloromethane show quasi-reversible peaks corresponding to the Mn(IV)/Mn(III) redox couple. [Copyright &y& Elsevier]
- Subjects :
- *MANGANESE
*ELECTROCHEMICAL analysis
*ALCOHOL
*DICHLOROMETHANE
Subjects
Details
- Language :
- English
- ISSN :
- 02775387
- Volume :
- 24
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Polyhedron
- Publication Type :
- Academic Journal
- Accession number :
- 17576532
- Full Text :
- https://doi.org/10.1016/j.poly.2005.01.004