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Dimethylthallium( III ) and methylmercury( II ) derivatives of pyridine-2-carbaldehyde thiosemicarbazone: synthesis and structure

1993; Royal Society of Chemistry; Issue: 8 Linguagem: Inglês

10.1039/dt9930001253

2050-5671

José S. Casas, Marı́a V. Castaño, M.C. Rodríguez-Argüelles, A. Sánchez, J. Sordo,

Lanthanide and Transition Metal Complexes

The reaction of dimethylthallium(III) hydroxide and methylmercury(II) chloride with pyridine-2-carbaldehyde thiosemicarbazone (HL) and its sodium salt, respectively, afforded [TlMe2(L)] and [HgMe(L)]. The thallium complex crystallizes in the triclinic space group P(no. 2) with a= 11.005(2), b= 12.153(2), c= 10.822(1)Å, α= 110.18(1), β= 99.79(1), γ= 70.39(1)°, and Z= 4 (R= 0.031, R′= 0.035). The unit cell has two independent molecules in each asymmetric unit, both containing an N,N′,S-tridentate ligand but with significant differences in bond distances and angles. The 1H NMR spectrum of [TlMe2(L)] in CDCl3 indicates that the bonding scheme observed in the solid state is retained in solution. Infrared data for [HgMe(L)] in the solid state suggest that the metal is N(hydrazinic), S-co-ordinated; in solution in chloroform, [HgMe(L)] consists of a mixture of (E) and (Z) isomers.