Crystallographic Determination of Three Ni-α-Hydroxyoxime-Carboxylic Acid Synergist Complexes
Open accessAbstract
X-ray crystal structures of three dicarboxylato-bis-α-hydroxyoximenickel(II) complexes have been obtained. These contain a short chained (C8) analogue of LIX®63 hydroxyoxime, along with either benzoate, isobutyrate or propionate. All have pseudo-octahedral structures with monodentate carboxylate anions located cis to one another and neutral, chelating α-hydroxyoxime ligands. Intra-molecular hydrogen bonding between each anionic acid's carboxylate group and an adjacent oxime hydroxyl group is evident. Inter-molecular hydrogen bonding is also observed. These provide the first definitive structural elucidation of the types of nickel complexes that could be formed during synergistic extraction by LIX®63 and carboxylic acids.
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X-ray structure determinations of Ni(II) complexes formed by model carboxylic acids and α-hydroxyoximes with aromatic or shorter aliphatic groups support structures in which the carboxylic acid rather than the oxime is deprotonated to balance the charge on the nickel dication.
“X-ray structure determinations of Ni(II) complexes formed by model carboxylic acids and a-hydroxyoximes that have aromatic or shorter aliphatic groups to enhance the formation of crystalline forms, support structures in which it is the carboxylic acid rather than the oxime that is deprotonated to balance the charge on the nickel dication (Fig. 15).43”
From Solvent extraction: the coordination chemistry behind extractive metallurgy (2014) · cites this paper as [43]
Inter-ligand hydrogen bonding generates meridional tridentate [NO2]- donor sets with 5- and 7-membered chelate rings resulting from the N-OH group of the oxime acting as hydrogen bond donor to the uncoordinated oxygen atom of the carboxylate.
“Inter-ligand hydrogen bonding generates meridional tridentate [NO 2 ] À donor sets with 5-and 7-membered chelate rings resulting from the N-OH group of the oxime unit acting as the hydrogen bond donor to the uncoordinated oxygen atom of the carboxylate.”
From Solvent extraction: the coordination chemistry behind extractive metallurgy (2014) · cites this paper as [43]
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Solvent extraction: the coordination chemistry behind extractive metallurgy
Wilson, A. M., Bailey, P. J., Tasker, P. A., Turkington, J. R., Grant, R. A., & Love, J. B. (2014) · Chem. Soc. Rev. · doi:10.1039/c3cs60275c · Cited by 561 · see citing works
Exploiting outer-sphere interactions to enhance metal recovery by solvent extraction
Turkington, J. R., Bailey, P. J., Love, J. B., Wilson, A. M., & Tasker, P. A. (2013) · Chemical Communications · doi:10.1039/c2cc37874d · Cited by 63 · see citing works
- Authors
- Barnard, K. R., Nealon, G. L., Ogden, M. I., & Skelton, B. W.
- Affiliations
- Commonwealth Scientific and Industrial Research Organisation (AU)
- Curtin University (AU)
- The University of Western Australia (AU)
- Corresponding author
- Barnard, Keith R.
- Venue
- Solvent Extraction and Ion Exchange
- Publisher
- Informa UK Limited
- Published
- 2010-10-29
- Volume
- 28
- Issue
- 6
- Pages
- 778-792
- ISSN
- 0736-6299 (ISSN-L)
- 1532-2262
- OpenAlex
- W2075189801
- Cited by
- 35
- References
- 0
- Citations by year
- 2024: 1 · 2023: 2 · 2021: 2 · 2020: 1 · 2019: 3 · 2018: 3 · 2017: 4 · 2016: 3 · 2015: 2 · 2014: 4 · 2013: 4 · 2012: 3
- FWCI
- 1.96
- Type
- journal article
- Language
- en
- Open access
- green
- hdl.handle.net
- Locations
- Solvent Extraction and Ion Exchange (publishedVersion)
- eSpace (Curtin University) (submittedVersion)
- UWA Profiles and Research Repository (UWA) (submittedVersion)
- Funders
- Australian Government
- Topics
- Physical Sciences › Chemistry › Inorganic Chemistry › Crystal structures of chemical compounds
- Physical Sciences › Engineering › Mechanical Engineering › Extraction and Separation Processes
- Physical Sciences › Chemistry › Organic Chemistry › Supramolecular Chemistry and Complexes
- Keywords
- nickel(II) complexes, LIX 63, synergistic extraction, carboxylate ligands, benzoate, isobutyrate, propionate, pseudo-octahedral coordination, hydrogen bonding, crystal structure, solvent extraction
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