Metal derivatives of N1-substituted thiosemicarbazones with divalent metal ions (Ni, Cu): Synthesis and structures

Reactions of nickel(II) acetate with N1-substituted pyridine-2-carbaldehyde- and salicylaldehyde thiosemicarbazones, {R1(H)C2N3–N2(H)–C1(S)–N1HR2}, have formed complexes of stoichiometry: (i) [Ni(κ3-N4, N3, S-pytscN1-R2)2] {R1 = C5H5N, R2 = Me, 1; Et, 2; Ph, 3} and (ii) [Ni(κ3-O, N3, S-stscN1-R2)L] {R1 = 2-HOC6H4, R2, L: Me, PPh3, 4; Et, PPh3, 5, Me, py, 6; Ph, py, 7}. Likewise copper(II) has formed complexes of stoichiometry: [Cu(κ3-O, N3, S-stscN1-R2)py] {R1 = 2-HOC6H4, R2 = Me, 8; Ph, 9}. These complexes have been characterized with the help of analytical data, spectroscopic techniques {IR, 1H and 31P NMR, electronic absorption} and single crystal X-ray crystallography (1, 2, 4, 6 and 8). The complexes have either distorted octahedral (1–3) or square planar geometries (4–9). The magnetic susceptibility measurements revealed that complexes 1–3, 8 and 9 are paramagnetic.

N1-substituted thiosemicarbazones {R1(H)C2N3–N2(H)–C1(S)–N1HR2} with nickel(II) formed octahedral complexes with R1 = 2-pyridyl (1) and square planar complexes with R1 = 2-hydroxyphenyl (6).Figure optionsDownload as PowerPoint slide