Spectroscopic studies on isomerisation of coordinated polyfunctional dihydrazone in going from monometallic to bimetallic complexes: Zinc(II), copper(II) and dioxouranium(VI) complexes of bis(2- hydroxy-1-naphthaldehyde )oxaloyldihydrazone

Abstract

The monometallic complexes of the type [Zn₂(H₄L)₂(SO₄]₂ (<b style="mso-bidi-font-weight:normal">1</b>), [Zn₂(H₂L)₂(H₂O₂] (<b style="mso-bidi-font-weight:normal">2</b>), K₂ [Zn₂(H₂L)₂F₂] (<b style="mso-bidi-font-weight:normal">2a</b>), and the heterobimetallic complexes of the type [(UO₂)₂Zn₂(L)₂₍H₂O)₆] (<b style="mso-bidi-font-weight:normal">3</b>), K₄ [(UO₂)₂Zn₂ (L)₂F₄(H₂O)₂] (<b style="mso-bidi-font-weight:normal">3a</b>), [Cu₂Zn₂(L)₂H₂O)₄] (<b style="mso-bidi-font-weight:normal">4</b>) and K₄[Cu₂Zn₂(L)₂F₄(H₂O)₂]

(<b style="mso-bidi-font-weight:normal">4a</b>) have been synthesized and characterized by analytical, molar conductance, and magnetic data and electronic, EPR, IR and ¹H NMR spectroscopic studies. Monometallic complexes have been shown to contain the coordinated dihydrazone in syn-<i style="mso-bidi-font-style:normal">c</i><i style="mso-bidi-font-style:normal">is</i>-configuration while the heterobimetallic complexes contain the coordinated dihydrazone in the anti-<i style="mso-bidi-font-style:normal">cis</i>-configuration.