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Five coordination modes of 4-aminopyrimidine with N-hydroxy-ethylethylenediaminetriacetatoruthenate(II)

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Summary

The complex [RuII(hedta)(4NH2pym)]−, hedta3− = N-hydroxyethylethylenediaminetriacetate, 4NH2pym = 4-aminopyrimidine, exists at pH 7 as five different coordination isomers, which are most readily distinguished by their electrochemical waves in comparison with the 2-aminopyridine (2NH2py) complex. The 2NH2py complex exhibits N(1) (pyridine bound), exo-NH2 (amine bound) and N(1), NH2-chelated species. The 4NH2pym complex forms N(1), exo-amine and N(3), NH2-chelated isomers analogues to the 2NH2py species, but also engages in η2 (olefin bound) coordination of the dearomatized 4NH2pym ring in C(5)–C(6), and another η2 type of complex involving electron density between N(1) and N(3) of the ring (η3 form). N(1), η2 and η3 isomers have also been detected for unsubstituted pyrimidine (pym), 4-methylprimidine (4CH3pym) and 2-aminopyrimidine (2NH2pym). Electrochemical waves (V versus NHE) for the five isomers are assigned as follows: (RuII/III) exo-NH2 (0.06 V), N(1) (0.29 V), η2 (0.49 V); (RuII/III) η3 (0.76 V); N(3), NH2-chelated (1.09 V).

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Authors and Affiliations

  1. Department of Chemistry, University of Pittsburgh, 15260, Pittsburgh, PA, USA

    Rex E. Shepherd & Songsheng Zhang

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  1. Rex E. Shepherd
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  2. Songsheng Zhang
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Shepherd, R.E., Zhang, S. Five coordination modes of 4-aminopyrimidine with N-hydroxy-ethylethylenediaminetriacetatoruthenate(II). Transition Met Chem 19, 146–150 (1994). https://doi.org/10.1007/BF00161876

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  • DOI: https://doi.org/10.1007/BF00161876

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