Reactivity of 1,4-Diaza-1,3-Butadienes towards Cu(II) Pivalate: A Rare Case of Polymeric Structure Formed by Bridging Diazabutadiene Ligands.

The reaction of copper(II) trimethylacetate, [Cu(Piv)2]n (Piv = (Me)3CCOO−), with 1,4-bis(R)-1,4-diaza-1,3-butadienes (R-DAD, R = 2,4,6-trimethylphenyl, Mes, or 2,6-diisopropylphenyl, dpp) in tetrahydrofuran afforded the coordination polymers [Cu2(Piv)4(Mes-DAD)]n (I) and [Cu2(Piv)4(dpp-DAD)]n (II). The structure of complexes in the crystal was determined by X-ray diffraction (CCDC nos. 2205866, 2205867). The products were shown to be 1D coordination polymers in which the binuclear {Cu2(Piv)4} moieties are linked into chains owing to the bridging function of 1,4-diaza-1,3-butadienes, which is unusual for this type of ligands. [ABSTRACT FROM AUTHOR]