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An unusual base-controlled equilibrium between monomeric and dimeric nickel(IV)–dimethylglyoxime complexes

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Abstract

Ionic nickel(IV)–dimethylglyoxime complexes have been prepared by oxidation of nickel(II)–dimethylglyoxime in alkaline solutions with ferricyanide. A novel base-controlled equilibrium is demonstrated between the monomeric and dimeric nickel(IV)–dimethylglyoxime complexes in solution. The oxidation state of nickel as +4 is confirmed by titration with hydroxylamine salt. The results obtained from the UV/VIS spectrophotometry, titrimetry, infrared and NMR studies are discussed.

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Acknowledgements

We (ASRK and UMK) thank UGC (India) for the financial assistance, and Andhra University and University of Cape Town for the facilities.

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Authors and Affiliations

  1. Department of Engineering Chemistry, College of Engineering, Andhra University, Visakhapatnam, 530 003, AP, India

    Akella Sivaramakrishna, Vepa Jagannadha Rao & Upadhyayula Muralikrishna

  2. Department of Chemistry, University of Cape Town, 7701, Rondebosch, Cape Town, South Africa

    Akella Sivaramakrishna & John R. Moss

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  1. Akella Sivaramakrishna
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  2. Vepa Jagannadha Rao
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  3. Upadhyayula Muralikrishna
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Correspondence to Akella Sivaramakrishna.

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Sivaramakrishna, A., Rao, V.J., Muralikrishna, U. et al. An unusual base-controlled equilibrium between monomeric and dimeric nickel(IV)–dimethylglyoxime complexes. Transition Met Chem 33, 475–479 (2008). https://doi.org/10.1007/s11243-008-9067-x

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