The asymmetric 3,5-disubstituted 1,2,4-triazole ligand HV (5-amino-3-picolinamido-1,2,4-triazole) by reaction with an excess of Cu(ii) perchlorate (Cu : HV being 12 : 1) has produced a novel hexanuclear {Cu(μ-O/H)(HV/V)} fragment, with one triangular Cu(μ-O/H) group connected to three peripheral single Cu(ii) ions through a -- bridging mode of the ligand, which is the building block of the three structures described here: one hexanuclear, [Cu(μ-O)(HV)(ClO)(HO)]·8HO (1), one dodecanuclear, [Cu(μ-O)(V)(ClO)(HO)](ClO)·6HO (2), and one tetradecanuclear 1D-polymer, {[Cu(μ-OH)(V)(HV)(ClO)(HO)](ClO)·14HO} (3), the last two containing hexanuclear subunits linked by perchlorato bridges. The Cu-Cu av. intra-triangle distance is 3.352(2) Å and the Cu(central)-Cu(bridged external) av. distance is 5.338(3) Å. The magnetic properties of the hexanuclear "CuO-3Cu" cluster have been studied, resulting as best fit parameters: = 2.18(1), (intra-triangle) = -247.0(1) cm and (central Cu - external Cu) = -5.15(2) cm.
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| http://dx.doi.org/10.1039/c9ra05922a | DOI Listing |
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