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Formation of Novel 1‐D Chains by μ‐Amido Bridging of Dinuclear Manganese( III )‐Schiff Base Complexes
Author(s) -
Bermejo Manuel R.,
GonzálezNoya Ana M.,
Abad Víctor,
Fernández M. Isabel,
Maneiro Marcelino,
Pedrido Rosa,
Vázquez Miguel
Publication year - 2004
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200400198
Subject(s) - chemistry , manganese , schiff base , amide , crystallography , infrared spectroscopy , stoichiometry , methanol , ligand (biochemistry) , nuclear magnetic resonance spectroscopy , spectroscopy , cyclic voltammetry , medicinal chemistry , stereochemistry , electrochemistry , organic chemistry , biochemistry , receptor , electrode , physics , quantum mechanics
Three novel neutral manganese( III ) complexes of stoichiometry Mn(R‐amsal‐3,5‐di‐ t Bu)(H 2 O) n [H 3 ‐R‐amsal‐3,5‐di‐ t Bu = 3‐aza‐4‐(2‐hydroxyphenyl)‐ N ‐(2‐hydroxyphenyl)but‐3‐enamide; (R = H, 4‐Me, 5‐ t Bu)] have been synthesised using potentially trianionic and pentadentate Schiff‐base ligands containing an amide group. Complexes were thoroughly characterised by elemental analysis, FAB mass spectrometry, infrared spectroscopy, magnetic susceptibility measurements and molar conductivities. Recrystallisation of these complexes from methanol yielded single crystals of [Mn 2 (amsal‐3,5‐di‐ t Bu) 2 (MeOH) 2 ] n 1 , [Mn 2 (4‐Me‐amsal‐3,5‐di‐ t Bu) 2 (MeOH) 2 ] n 2 and [Mn 2 (5‐ t Bu‐amsal‐3,5‐di‐ t Bu) 2 (MeOH) 2 ] n 3 with methanol as solvate. Their X‐ray characterisation shows that these complexes consist of infinite one‐dimensional chains with a repeating cyclic dimeric unit, where the amide oxygen atom is bridging two neighbouring manganese( III ) ions. Paramagnetic 1 H NMR spectroscopy confirmed the presence of Mn III in these complexes, while the cyclic voltammetry studies suggest the possibility of obtaining polynuclear Mn IV complexes with this kind of ligand. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)