Transition metal complexes with thiosemicarbazide-based ligands. XV. A square-pyramidal NiII complex with an asymmetric coordination of 2, 6-diacetylpyridine bis(S-methylisothiosemicarbazone)
The title compound, [diacetylpyridine bis(S-methylisothiosemicarbazonato)]iodonickel(II), [Ni(C(13)H(18)N(7)S(2))I], is the first example of a complex involving the (2)N coordination of the isothiosemicarbazide moiety. 2,6-Diacetylpyridine bis(S-methylisothiosemicarbazone), as a potentially pentadentate ligand (N(5)), is coordinated as a tetradentate species, whereby one (deprotonated) isothiosemicarbazide moiety is coordinated in the usual way ((1)N(4)N), but the other (neutral) is bonded via the (2)N atom only, the fourth ligator being the pyridine nitrogen. The difference in coordination mode of the isothiosemicarbazide moiety is reflected in the (1)N-(2)N bond lengths of 1.359 (4) and 1.379 (3) A in the deprotonated and undeprotonated moieties, respectively. The structure contains three fused chelate rings in a 5:5:6 arrangement. The six-membered ring has a non-planar conformation.
Leovac
VM
Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovica 3, 21000 Novi Sad, Yugoslavia.
Bogdanovic
GA
Cesljevic
VI
Divjakovic
V