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Issue 13, 2014
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Syntheses, crystal structures and magnetic properties of five new manganese(II) complexes: influence of the conformation of different alkyl/aryl substituted malonate ligands on the crystal packing

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Abstract

Five new manganese(II)-based complexes of general formula [Mn(Rmal)(H2O)]n with Rmal = methylmalonate (Memal) (1), dimethylmalonate (Me2mal) (2), diethylmalonate (Et2mal) (3), butylmalonate (Butmal) (4) and benzylmalonate (Bzmal) (5) were synthesized and their structures characterized by single crystal X-ray diffraction. 1 and 2 are three-dimensional compounds whereas 3–5 exhibit two-dimensional networks. The structure of 1 consists of chains of μ-κO:κO bridged aquamanganese(II) ions which are interlinked through antianti carboxylate bridges. The structure of 2 is built by double μ-κO:κO bridged bis[aquamanganese(II)] entities which are linked to six other dimanganese(II) units through oxo- and antisyn carboxylate bridges. These dinuclear entities also occur in 4 and 5. They are interconnected by antianti and antisyn carboxylate bridges to four other units, leading to neutral layered structures. Finally, compound 3 consists of aqua-bridged chains of manganese(II) ions connected through tetrakis(monodentate) Et2mal ligands leading to a sheet-like structure. The topological representation of the crystal structures shows the of four different nets: (10,3)-d utp (1), 6-connected crs (2), gek2 (3) and the square-grid sql topology (4–5). The magnetic properties of 1–5 were investigated in the temperature range 2.0–300 K. Overall antiferromagnetic behavior occurs in 1, 2, 4 and 5 with susceptibility maxima in the range 3.6–17.0 K. Compound 3 exhibits an overall antiferromagnetic behaviour in the high temperature range with a weak spin canting in the low temperature domain and magnetic ordering below ca. 32 K.

Graphical abstract: Syntheses, crystal structures and magnetic properties of five new manganese(ii) complexes: influence of the conformation of different alkyl/aryl substituted malonate ligands on the crystal packing

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Publication details

The article was received on 15 Oct 2013, accepted on 17 Jan 2014 and first published on 20 Jan 2014


Article type: Paper
DOI: 10.1039/C3CE42086H
Citation: CrystEngComm, 2014,16, 2766-2778
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    Syntheses, crystal structures and magnetic properties of five new manganese(II) complexes: influence of the conformation of different alkyl/aryl substituted malonate ligands on the crystal packing

    M. Déniz, I. Hernández-Rodríguez, J. Pasán, O. Fabelo, L. Cañadillas-Delgado, J. Vallejo, M. Julve, F. Lloret and C. Ruiz-Pérez, CrystEngComm, 2014, 16, 2766
    DOI: 10.1039/C3CE42086H

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