Tetranuclear [Mn 2 Co 2 ], [Mn 2 Fe 2 ], and [Mn 2 Mn 2 ] Complexes with Defective Double‐Cubane Cores and Phenoxo and Oxo Bridges: Syntheses, Crystal Structures, and Electronic Properties

Autor: Babulal Das, Brian Moulton, Koushik Pramanik, Jean-Pierre Costes, Michael J. Zaworotko, Jean-Pierre Tuchagues, Swapan K. Chandra, Pijush Malpaharia
Rok vydání: 2014
Předmět:
Zdroj: European Journal of Inorganic Chemistry. 2014:3527-3535
ISSN: 1099-0682
1434-1948
Popis: Three new tetranuclear complexes [MnIII2CoIII2O2(L)2][ClO4]2 (1), [MnIII2FeIII2O2(L)2][ClO4]2 (2), and [MnIII2MnIII2O2(L)2][MnII(NCS)4] (3) have been synthesized through reactions of the mononuclear [MnIIIL] precursor with the corresponding metal perchlorate under aerobic conditions [H3L = tris(2-salicylaldimine)amine, a condensation product between tris(2-aminoethyl)amine and salicylaldehyde in a 1:3 molar ratio]. These compounds have been characterized by spectroscopic and analytical techniques including single-crystal X-ray structure analysis, electron paramagnetic resonance (EPR) spectroscopy, Mossbauer spectroscopy, and magnetic measurements. The structure of 1 consists of oxo-/phenoxo-bridged CoIII and MnIII centers in a defective double-cubane topology. The molecules of 2 and 3 have similar structures with the CoIII centers changed to FeIII centers in 2 and to MnIII centers in 3. These isostructural complexes have been scrutinized with regard to changes in distortions (distances and angles) of the metal coordination spheres. Magnetic studies indicate that 1, 2, and 3 show predominant antiferromagnetic interactions. Changes in the electronic properties concomitant with changes in the distortions in 1, 2, and 3 are analyzed in terms of magnetostructural correlations.
Databáze: OpenAIRE
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