J. Garcia-tojal et al., Biological activity of complexes derived from thiophene-2-carbaldehyde thiosemicarbazone. Crystal structure of [Ni(C6H6N3S2)(2)], J INORG BIO, 86(2-3), 2001, pp. 627-633
The crystal structure of [Ni(L-III)(2)] (1), where HLIII = thiophene-2-carb
aldehyde thiosemicarbazone, consists of monomeric entities where the nickel
(II) ions exhibit distorted square planar geometry. The two bidentate thios
emicarbazone ligands are centrosymmetric. (CS)-S-... van der Waals' links a
nd nonbonded intramolecular interactions are present in the structure. The
biological activity of 1 is compared to that of the free ligand, and the co
balt (III) (2) and copper(H) (3) derivatives. The observed order of cytotox
icity against melanoma B16F10 and Friend erythroleukemia. cells is: 1 less
than or equal to ligand <2 <3. A structure-activity correlation using Exten
ded-Huckel MO calculations is described. (C) 2001 Elsevier Science BY All r
ights reserved.