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Valence directed binding mode of [2 × 2] iron grids of an unsymmetrical picolinic hydrazone based ligand

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Abstract

A new unsymmetrical ditopic ligand H2L was used to synthesize two [2 × 2] grid type tetranuclear trivalent and mixed-valent FeIII4, FeII2FeIII2 complexes, respectively. Both complexes [FeIII4(L′)4] (1) and [FeII2FeIII2(L)4](BF4)2·2CH3CN (2) have been X-ray structurally characterized. The magnetic properties of complexes 1 and 2 show dominant antiferromagnetic coupling. Mössbauer studies were carried out to confirm the electronic states of the iron centres. The structural properties of the two complexes are diverse though they have been synthesized from the same ligand but under different conditions. In 1, all the Fe(III) metal centres are coordinated by two pairs of parallel but oppositely aligned ligand strands arranged in a ‘head-to-tail’ fashion, whereas in 2, Fe(II) and Fe(III) metal centres are coordinated by two pairs of parallel aligned ligand strands arranged in a ‘head-to-head’ fashion.

Graphical abstract: Valence directed binding mode of [2 × 2] iron grids of an unsymmetrical picolinic hydrazone based ligand

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Publication details

The article was received on 05 Jul 2017, accepted on 23 Aug 2017 and first published on 24 Aug 2017


Article type: Paper
DOI: 10.1039/C7DT02433A
Citation: Dalton Trans., 2017, Advance Article
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    Valence directed binding mode of [2 × 2] iron grids of an unsymmetrical picolinic hydrazone based ligand

    S. M. Hossain, A. Lakma, R. N. Pradhan, S. Demeshko and A. K. Singh, Dalton Trans., 2017, Advance Article , DOI: 10.1039/C7DT02433A

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