Abstract
Complexes of Ni(II) and Co(II) of the formulae [Ni(H2O)4(pht)2] (1) and [Co(H2O)4(pht)2]·1,5NH3·H2O (2) (where pht = phenotoinate anion) were obtained and characterized physicochemically. [Ni(H2O)4(pht)2] (1) crystallizes in a monoclinic space group P21/c; a = 11.7358(8), b = 11,1250(8), 11.4182(7) Å; β = 97.076(5)°; V = 1479.41 Å3; Z = 2. The environment around the nickel and cobalt ions can be described as a distorted octahedron. The metal ion was found to bind to four water molecules and two nitrogen atoms derived from two anions of the monodentate phenytoinate. Four intramolecular hydrogen bonds designated as S(6) graph set are found in one [Ni(H2O)4(pht)2] (1) molecule. Two chain HB patterns, constructed by the [Ni(H2O)4(pht)2] molecules extending along the c and b axes, respectively, have been observed. The cobalt complex precipitates with the additional solvent molecules: one and a half of ammonia and one water. The results document the preferential binding of hydantoins to the metal ions through N(3) atom.
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Acknowledgements
The authors would like to thank M. Dembowa, K. Maliszewska and W. Kiełbus for their great help in the preparation of the complexes (M.D., K.M.), and the elemental analysis (W.K., K.M.). Ms. E. Mróź is acknowledged for recording the infrared spectra. This work was supported by a grant from the Wroclaw University of Technology (No. W3 343813).
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Dedicated to Professor Adam Bartecki on the occasion of his 90th birthday.
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Puszyńska-Tuszkanow, M., Daszkiewicz, M., Maciejewska, G. et al. Interaction of hydantoins with transition metal ions: synthesis, structural, spectroscopic, thermal and magnetic properties of [M(H2O)4(phenytoinate)2] M = Ni(II), Co(II). Struct Chem 21, 315–321 (2010). https://doi.org/10.1007/s11224-009-9533-x
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DOI: https://doi.org/10.1007/s11224-009-9533-x