Abstract
The synthesis, characterization and X-ray structures of two compounds with the general formula trans-M(biz)2(NCS)2 (in which biz = 2,2′-biimidazoline and M = Mn(II) for compound 1 and Ni(II) for compound 2) are reported. Both compounds crystallize in the triclinic space group P-1 with a = 8.393(5), b = 8.946(5), c = 7.659(5) Å, α = 104.440(5), β = 106.880(5), γ = 66.180(5)∘, V = 497.7(5) Å3, Z = 1 for compound 1 and a = 8.155(2), b = 8.8190(10), c = 7.480(2) Å, α = 102.259(15), β = 106.135(13), γ = 67.706(14)∘, V = 474.7(2) Å3, Z = 1 for compound 2.
Both metal ions show octahedral coordination with the four nitrogen atoms of two biz ligands in the equatorial plane and the two nitrogen atoms of two isothiocyanate anions in the axial positions. The M–N≡C angles are 166.5(2) and 167.7(2) for compounds 1 and 2, respectively. These values are in the usually obtained range for trans-isothiocyanate coordinated compounds. The sulfur atom of each isothiocyanate anion acts as acceptor for the hydrogen bond with the NH group of the biz ligands. In the IR spectrum the vibrations of the thiocyanate anion are observed at 2090 and 776 cm−1 for compound 1 and at 2108 and 778 cm−1 for compound 2, and these values are typical for linear-bond isothiocyanate complexes of transition metals.
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Albada, G.A.v., Mohamadou, A., Lanfredi, A.M.M. et al. Bis(2,2′-biimidazoline)bis(isothiocyanato)Metal(II) compounds. Synthesis, characterization and lattice hydrogen bonding for Metal = Mn(II) and Ni(II). J Chem Crystallogr 35, 541–546 (2005). https://doi.org/10.1007/s10870-005-2858-4
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DOI: https://doi.org/10.1007/s10870-005-2858-4