Synthesis and structures of copper(II) anion-bridged aggregates and chains: control over molecular shape

Abstract

Di-2-pyridyl ketone (dpk) can complex metal ions in its activated [(NC₅H₄)₂C(OR)(OH)] or non-activated form. In its activated form it displays a dinucleating behaviour as manifested by the compounds [{Cu₂[(NC₅H₄)₂C(OEt)O]Cl₃(EtOH)}₂] and [{Cu₂[(NC₅H₄)₂C(OMe)O]Cl₃}_∞](which also possess halide bridges). These compounds have been structurally characterised using single-crystal X-ray diffraction. In its non-activated form it acts as a simple bidentate chelate. The X-ray analysis of [{Cu(dpk)(NO₃)₂}_∞] revealed an anion-bridged structure where bridging nitrato groups link the copper centres. The π-stacking arrangements of these compounds are also considered.