Structural and spectroscopic characterization of two new thallium(I)/thiosaccharinate complexes

The crystal structures of [Tl(tsac)] (1) and [Tl(tsac)(ophen)] (2) (tsac = anion of thiosaccharin; ophen = 1,10 phenanthroline) have been determined at 116 K by single crystal X-ray diffractometry. Complex I crystallizes in the monoclinic space group P2(1)/a with Z 4 and complex 2 in the monoclinic space group C2/c with Z 8. In both complexes T-I is coordinated to a thiosaccharinate anion through its sulphur and nitrogen atoms. A distorted eight fold coordination sphere around the cation in complex I is completed with two other longer Tl-S bonds and four Tl...O contacts with five symmetry related neighbouring thiosaccharinate anions. A phenanthroline molecule acting as a bidentate ligand through its nitrogen atoms completes a four-fold coordination around the metal atom in complex 2. The infrared spectra of both complexes were also recorded and their most important features discussed on the basis of its structural peculiarities.