Triphenyl lead, tin and germanium coordination compounds derived from 9H-3-thia-1,4a,9-triaza-fluorene-2,4-dithione

Reactions of potassium 4-thioxo-3-thia-1,4a,9-triaza-fluorene-2-thiolate with Ph3PbCl, Ph3SnCl and Ph3GeCl provided the corresponding metal pentacoordinated compounds 2–4. Addition of THF afforded their hexacoordinated derivatives (5–7). Adducts of 2 and 3 with DMSO (8, 10), pyridine (9, 11), Ph3PO (12, 14) CH3OH (13, 15), respectively were synthesized. Compound 2 afforded the H2O adduct (16). In all cases the metal atom is chelated by the ligand through a covalent bond with S2 and a coordination bond with N1 forming four membered rings. Compounds were identified by 1H, 13C, 15N, 119Sn and 207Pb. X-ray diffraction structures of 2, 3, 8, 9, 11, 14 and 16 were obtained.

Graphical abstractReactions of K 4-thioxo-3-thia-1,4a,9-triaza-fluorene-2-thiolate with Ph3MCl, (Ge, Sn and Pb) provided metal pentacoordinated compounds. Addition of THF, DMSO, pyridine, Ph3PO and CH3OH afforded hexacordinated Sn and Pb compounds. A H2O adduct was obtained for the Pb compound. In all cases the metal atom is chelated through S and N forming four membered rings. Compounds were identified by 1H, 13C, 15N, 119Sn, 207Pb NMR and by X-ray diffraction.Figure optionsDownload full-size imageDownload as PowerPoint slide