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Issue 10, 2014
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Chiral [NaMnIIMnIII3] and [Na2MnII2MnIII6] clusters constructed by chiral multidentate Schiff-base ligands: synthesis, structures, CD spectra and magnetic properties

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Abstract

Two pairs of novel enantiomerically chiral clusters R/S-[NaMnIIMnIII3L33-O)] (R/S-1) and R/S-[Na2MnII2MnIII6L63-O)2] (R/S-2) have been obtained via the self-assembly of R/S-H2L Schiff base ligands and different auxiliary ligands (N3, dca) with divalent manganese salt in an air-exposed methanol–ethanol solution. The structures of R/S-1 and R/S-2 were characterized by single-crystal X-ray diffraction analysis and powder X-ray diffraction. When the dicyanamide anion serves as an auxiliary ligand in the assembling reaction system, a pair of enantiomeric clusters R/S-[NaMnIIMnIII3L33-O)] (R-1 and S-1) with a trigonal bipyramid configuration were obtained, while another pair of enantiomeric clusters R/S-[Na2MnII2MnIII6L63-O)2] (R-2 and S-2) were formed in the case of the azide. Interestingly, the skeleton configuration of R/S-2 can be described as a 3-fold EO-azide bridging double trigonal bipyramid of [NaMnIIMnIII3L33-O)]2via MnII vertices. Circular dichroism (CD) spectra demonstrated the enantiomeric nature of the two pairs of clusters. Detailed direct current (DC) magnetic susceptibility studies in the temperature range 2–300 K suggested that R-1 and R-2 showed predominantly antiferromagnetic interactions between the manganese centers.

Graphical abstract: Chiral [NaMnIIMnIII3] and [Na2MnII2MnIII6] clusters constructed by chiral multidentate Schiff-base ligands: synthesis, structures, CD spectra and magnetic properties

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Publication details

The article was received on 11 Jul 2013, accepted on 29 Nov 2013 and first published on 02 Dec 2013


Article type: Paper
DOI: 10.1039/C3DT51874D
Citation: Dalton Trans., 2014,43, 3880-3887
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    Chiral [NaMnIIMnIII3] and [Na2MnII2MnIII6] clusters constructed by chiral multidentate Schiff-base ligands: synthesis, structures, CD spectra and magnetic properties

    Y. Song, G. Zhang, X. Qin, Y. Gao, S. Ding, Y. Wang, C. Du and Z. Liu, Dalton Trans., 2014, 43, 3880
    DOI: 10.1039/C3DT51874D

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