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Title: Synthesis, crystal structure and fluorescence studies of two manganese(III) complexes of aminebis(phenolate) ligands
Authors: Maity, Dipankar
Sheldrick, W S
Mayer-Figge, H Mayer-Figge
Ali, Mahammad
Issue Date: Jul-2007
Publisher: CSIR
IPC CodeInt. Cl. ⁸ C07F13/00
Abstract: Two manganese(III) complexes, [Mnˡˡˡ(L¹)(N₃)(MeOH)] (1) and [Mnˡˡˡ(L²)(N₃)(MeOH)] (2) where, H₂L1 = N,N-bis(2-hydroxy-3-5-di-tert-butylbenzyl)-N′,N′-dimethyl ethylenediamine and H₂L² = N,N-bis(2-hydroxy-3-5-dimethylbenzyl)- N′,N′-dimethyl ethylenediamine have been synthesized and characterized by elemental analyses, IR, ESI mass spectroscopy and cyclic voltammetric studies. Single crystal X-ray study on 2 reveals that the manganese(III) atom is octahedrally coordinated under O₃N₃ donor environment with oxygen atom of coordinated methyl alcohol and nitrogen (N2) atom of (N′,N′-dimethyl) ethyl side arm of the ONNO donor ligand (H₂L²) occupying the axial sites while the two oxygen atoms (O1 and O2), tripodal nitrogen atom (N1) from bis(phenolate) ligand and one nitrogen atom (N3) from azide co-ligand occupying the equatorial plane. Both the complexes show irreversible cyclic voltammeric responses. Steady-state fluorescence studies on the ligands H₂L¹ and H₂L² and their corresponding complexes reveal significant differences in the fluorescence pattern (broadening of the band due to complexation) and in the fluorescence yield (at the same OD) establishing the complexation process.
Page(s): 1057-1062
ISSN: 0376-4710
Source:IJC-A Vol.46A(07) [July 2007]

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