Synthesis, spectroscopic, and crystallographic characterizations of an antiferromagnetically coupled, oxobridged trinuclear manganese(IV) cluster [Mn3O4(H2O)2(phen)4] (NO3)4·3H2O [phen = 1,10-phenanthroline]

Bhaskar Biswas, Abhijit Pal, Partha Mitra, Floriana Tuna, Manabendra Mukherjee, Rajarshi Ghosh

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Design and synthesis of a triangular manganese compound, [Mn 3O4(H2O)2(phen)4] (NO3)4·3H2O (1) with mono-μ-oxo and di-μ-oxo, is described. The complex has been characterized by elemental analysis, spectroscopy, single crystal and powder diffraction measurements, thermogravimetric analysis, etc. Bond Valence Sum calculations and X-ray photoelectron spectroscopy reveal that each manganese at each vertex of the triangle is +IV oxidation state. Variable temperature magnetic measurements show strong antiferromagnetic coupling between metal ions with the following set of parameters: g=1.99, J1=-50.0 cm-1, and J2=-90.2 cm-1 (where J1 describes the interaction across the two mono-μ-oxo bridges and J2 is the exchange coupling across the di-μ-oxo bridge). The compound breaks down in three steps when heated from room temperature to 900°C. The final ash of the compound is confirmed by infrared spectrum with standard MnO2. © 2012 Taylor & Francis.
    Original languageEnglish
    Pages (from-to)4067-4076
    Number of pages9
    JournalJournal of Coordination Chemistry
    Volume65
    Issue number23
    DOIs
    Publication statusPublished - 2012

    Keywords

    • BVS calculation
    • Crystal structure
    • Magnetism
    • Synthesis
    • Thermal property
    • XPS

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