Synthesis, crystal structure and magnetic characterization of a series of four phenoxo-bridged binuclear manganese(III) Schiff base complexes |
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Authors: | Santanu Mandal Michel Fleck Joan Ribas |
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Affiliation: | a Department of Chemistry, Bankura Christian College, Bankura, West Bengal, India b Department of Chemistry, Kalinga Institute of Industrial Technology, Bhubaneswar, Orissa, India c Institute of Mineralogy and Crystallography Geozentrum, University of Vienna, Althanstrasse 14 A-1090 Vienna, Austria d Laboratoire des Multi-matériaux et Interfaces, Groupe de Cristallographie et Ingénierie Moléculaire, UMR 5615 CNRS, Université Claude Bernard Lyon 1, Campus de la Doua, Bâtiment Raulin (rdc), France e Departament de Quimica Inorganica, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain |
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Abstract: | A family of four new phenoxo-bridged binuclear manganese(III) complexes of the general formula, [Mn(L)(X)]2 where L = [N,N′-bis(salicylidene)]propane-1,2-diamine and X = salicylaldehyde anion (sal−) (1); NCS− (2); NCO− (3) and [Mn(L′)(N3)]2·2C2H5OH (4) where L′ = [N,N′-bis(2-hydroxyacetophenylidene)]propane-1,2-diamine has been prepared. The syntheses have been achieved by reacting manganese perchlorate with 1,2-diaminopropane and salicylaldehyde (or 2-hydroxyacetophenone for 4) or along with the respective pseudohalides so that the tetradentate Schiff base H2L or H2L′ is obtained in situ to bind the Mn(III) ion. The complexes have been characterized by IR spectroscopy, elemental analysis, crystal structure analysis and variable-temperature magnetic susceptibility measurements. The single crystal X-ray diffraction studies show that the compounds are isostructural containing dimeric Mn(III) units with bridging phenolate oxygen atoms. Low temperature magnetic studies indicate that the complexes 1-3 exhibit intradimer ferromagnetic exchange as well as single-molecule magnet (SMM) behavior while complex 4 is found to undergo an intradimer antiferromagnetic coupling. |
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Keywords: | Manganese(III) Binuclear complex Schiff base Crystal structure Ferromagnetic exchange Single-molecule magnet |
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