Abstract
The title compoud, [TlMe 2(HL)(H 2O)] (HL = monoanion of pyridoxal thiosemicarbazone), crystallizers in the triclinic space group P 1 (C 1, 1 , No. 2). The HL −anion coordinates to the thallium atom, in an unusual mode through the S atom ( Tl-S = 2.832(1) A ̊ ), and also forms a weak bond with the metal atom of a neighbouring molecule to make an asymmetric bridge ( Tl′…S = 3.190(1) A ̊ ). The acidic proton retained in the thiosemicarbazonato anion is located on the oxygen of the phenolic hydroxyl group. The water molecule is only 2.630(4) Å from the metal, suggesting a rather strong bond that contrasts with the long distance between the thallium and the phenolic oxygen ( Tl…O(1)′ = 3.124(4) A ̊ ). If both strong and weak intermolecular interactions are taken in account, the metal has distorted octahedral coordination with the methyl groups in apical positions. The solid state IR spectrum and 1H, 13C and 205Tl NMR spectra in DMSO solution are also discussed.
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