Synthesis and structural characterization of complexes of Zn(II), Cd(II) and Hg(II) halides with 2-formylpyrrole thiosemicarbazone and 2-acetylpyrrole thiosemicarbazone

Reaction of 2-[1-(pyrrol-2-yl)methylidenelhidrazine carbothioamide (L-1) and 2-[1-(pyrrol-2-yl)ethylidene]hidrazine carbothioamide (L-2) with zinc(II) cadmium(II) and mercury(II) halides afforded complexes with formulae [M(L-1)(2)X-2] [M, X = Zn, Cl (I); Cd, Cl (4); Hg, CI (7); Hg, Br (8); Hg, I (9)], [M(L-1)(2)X-2] [M, X = Zn, Br (2); Zn, I (3); Cd, Br (5); Cd, I (6)], [M(L-2)X-2] [M, X = Cd, Cl (13); Hg, Cl (16); Hg, Br (17); Hg, I (18)] and [M(L-2)(2)X-2] [M, X = Zn, Cl (10); Zn, Br (11); Zn, I (12); Cd, Br (14); Cd, I (15)]. Crystals of 5, 18 and 15 . CH3CN were studied by X-ray diffractometry, and all the new compounds were characterized by elemental analysis, mass spectrometry, IR and H-1 and C-13 NMR spectroscopy and, when pertinent and allowed by the solubility of the compounds, Cd-113 or Hg-199 NMR spectroscopy. In these complexes, the metal atoms are tetra-coordinate and the ligands are neutral and S-monodentate. (C) 2001 Elsevier Science B.V. All rights reserved.