Abstract
Bis( o-aminobenzaldehyde)thiocarbohydrazone (HL) forms with copper(II) nitrate a tetranuclear complex [Cu 2(L)(NO 3) 3] 2·2H 2O, in which two dinuclear units are joined by nitrate bridges. The dihydrazone ligand behaves ditopically, providing NNS and NNN binding sites, with the four coppers essentially in a square-pyramidal geometry. The tetranuclear molecule displays intramolecular magnetic interactions, with the antiferromagnetic exchange (−2 J = 210(1) cm −1) between the copper(II) ions within each dinuclear moiety dominant over weak interdimer ferromagnetic coupling.
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