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Issue 22, 2013
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A new end-on azido bridged MnIII single-chain magnet and its dimeric single molecule magnet polymorph. Synthesis, structure and magnetic properties of [Mn(5-Clsalpn)N3]n and phenoxo bridged [Mn(5-Clsalpn)N3]2

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Abstract

An end-on azido bridged MnIII coordination chain polymer [Mn(5-Clsalpn)N3]n (complex 1) and its dimeric polymorph, [Mn(5-Clsalpn)N3]2 (complex 2), where 5-Clsalpn is N,N′-bis(5-chlorosalicylidene)-1,3-diaminopropane, were prepared. Complex 1, which is obtained as two concomitant polymorphs (1a and 1b) with nearly identical molecular structures but different crystal packing, has μ-1,1(end-on) azido bridges. This single atom bridge is unsymmetrical and leads to a −1 cm−1 antiferromagnetic interaction among MnIII centers of the one-dimensional coordination polymer. MnIII anisotropy is manifested through Jahn–Teller elongation along the N(azido)–Mn–N(azido) axis, and results in single-chain magnet behavior. The phenoxo-bridged dimer (complex 2) has terminal azido ligands and a ferromagnetic interaction is mediated by the unsymmetrical bis-phenoxo bridge. MnIII anisotropy is manifested through Jahn–Teller elongation along an N–Mn–O axis, and results in single molecule magnet behavior. The dimers are organized into a two-dimensional network structure via Cl⋯Cl and Cl⋯H-phenyl interactions which are also ferromagnetic.

Graphical abstract: A new end-on azido bridged MnIII single-chain magnet and its dimeric single molecule magnet polymorph. Synthesis, structure and magnetic properties of [Mn(5-Clsalpn)N3]n and phenoxo bridged [Mn(5-Clsalpn)N3]2

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Publication details

The article was received on 16 Mar 2013, accepted on 21 Mar 2013 and first published on 21 Mar 2013


Article type: Paper
DOI: 10.1039/C3DT31966K
Citation: Dalton Trans., 2013,42, 8113-8123
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    A new end-on azido bridged MnIII single-chain magnet and its dimeric single molecule magnet polymorph. Synthesis, structure and magnetic properties of [Mn(5-Clsalpn)N3]n and phenoxo bridged [Mn(5-Clsalpn)N3]2

    G. Bhargavi, M. V. Rajasekharan, J.-P. Costes and J.-P. Tuchagues, Dalton Trans., 2013, 42, 8113
    DOI: 10.1039/C3DT31966K

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