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Issue 4, 2013
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Syntheses, structure, and magnetic properties of heteronuclear Cu(II)4Fe(III)4 cluster and Cu(II)8 bimetallacycles

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Abstract

The compartmental Schiff base ligands N,N′-ethylenebis(3-hydroxysalicylidene) (H4L) and N,N′-propylenebis(3-hydroxysalicylidene) (H4L′) have been employed in the synthesis of a cyclic tetranuclear Cu(II) complex [Cu4(L′)2(MeOH)3(H2O)]·[Cu4(L′)2(MeOH)3] (1), a novel octanuclear Cu(II) complex [Cu8(L–L)2(H2O)42-H2O)]·3DMF·3H2O (2) and a hetero-octanuclear Cu(II)–Fe(III) complex [Cu4Fe4(L)4(H2O)33-O)2]·3DMF·3H2O (3). During the formation of the Cu8 complex (2), a new bis-Schiff base ligand (L–L)8− forms via the orthopara C–C coupling of two H4L ligands. The bicyclic complex (2) is comprised of two cyclic Cu4 units that are similar to that of complex 1. In the Cu4 unit, the alternate Cu(II) ions are singly bridged by phenoxo groups. The three complexes display overall antiferromagnetic coupling, and the Cu(II)–Cu(II) magnetic coupling constant falls in the range −117.2 to −473.6 cm−1 for complexes 1 and 2 corresponding to the bridging Cu–Ophenoxide–Cu bond angles of 124.3–131.0°.

Graphical abstract: Syntheses, structure, and magnetic properties of heteronuclear Cu(ii)4Fe(iii)4 cluster and Cu(ii)8 bimetallacycles

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Publication details

The article was received on 28 Jul 2012, accepted on 04 Oct 2012 and first published on 09 Oct 2012


Article type: Paper
DOI: 10.1039/C2DT31708G
Citation: Dalton Trans., 2013,42, 1102-1108
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    Syntheses, structure, and magnetic properties of heteronuclear Cu(II)4Fe(III)4 cluster and Cu(II)8 bimetallacycles

    K. Hu, S. Wu, G. An, A. Cui and H. Kou, Dalton Trans., 2013, 42, 1102
    DOI: 10.1039/C2DT31708G

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