1.6 - β-Diketones and Related Ligands

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  • Selection of a suitable ligand for the supercritical extraction of gold from a low-grade refractory tailing

    2022, Journal of Supercritical Fluids
    Citation Excerpt :

    A β-diketone is a molecule containing two ketones separated by one carbon atom. The most common, simple β-diketone is acetylacetone and most of the derivatives of β-diketones are based on substituting methyl groups with different functional groups on it [15]. Fluorinated β-diketones have been used in conjunction with organophosphorus ligands in synergistic leaching.

  • Coordination chemistry of pyrazolone-based ligands and applications of their metal complexes

    2019, Coordination Chemistry Reviews
    Citation Excerpt :

    There exist several variants of pyrazolone-based ligands, but here we will address those with the azomethine C = N-R fragment on C4. Acylpyrazolones, with two O donor atoms in the chelating moiety, have been extensively reviewed by us [44–46] and will not be considered here. We will also avoid the exploration of similar ligands based on antipyrine, where the N2 atom of the pyrazolone ring is substituted, as an extensive review on such molecules has been previously reported [47].

  • Ni(II), Pd(II) and Pt(II) complexes with SacNac tridentate ligand

    2019, Polyhedron
    Citation Excerpt :

    Particularly, Acac’s ligands are well known in coordination chemistry. Their homoleptic complexes had been described for almost all the transition elements [7]. Additionality, derivatives of the β-diketonate compounds tuning either one or two of the oxygens by the less hard N, P and S atoms (AcNac, NacNac, SacNac, SacSac and AcPac) have been described in the bibliography [8–11].

  • Recent advances in acylpyrazolone metal complexes and their potential applications

    2015, Coordination Chemistry Reviews
    Citation Excerpt :

    But transition- and lanthanide-metal derivatives also display interesting catalytic features, where the β-diketonates are important spectator donors for metal-intermediate species involved in a number of organic reactions, and find increasing interest as supramolecular assemblies in material chemistry. Besides classical β-diketones, an interesting functionalization has been the fusion of a pyrazole ring to the chelating arm, affording a novel family of enolizable ligands, named 4-acyl-5-pyrazolones, the first synthesis of such molecules being reported at the end of the XIX century [3], even if only in 1959 Jensen published an advantageous method of preparation of 1-phenyl-3-methyl-4-acylpyrazol-5-ones [4]. These ligands have been used for a long time as convenient metal extractants or chelating reagents in the spectroscopic determination of metals in traces, largely used in analytical chemistry for determination and isolation of almost all metal ions, due to high extracting ability of acylpyrazolonates, lower pKa values in comparison with conventional β-dicarbonyl compounds, great separation power, intense color of the complex extracts and low-solubility of the complexes in some solvents [5].

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