Germanium and Tin Precursors for Chalcogenide Materials Containing N-Alkoxy Thioamide Ligands

This study describes the synthesis of germanium and tin complexes Ge(mdpaS)(2) (1), Ge(edpaS)(2) (2), Ge(bdpaS)(2) (3), Ge(empaS)(2) (4), Sn(mdpaS)(2) (5), Sn(edpaS)(2) (6), Sn(bdpaS)(2) (7), and Sn(empaS)(2) (8) (mdpaSH = (Z)-N-methoxy-2,2-dimethylpropanimidothioic acid; edpaSH = (Z)-N-ethoxy-2,2-dimethylpropanimidothioic acid; bdpaSH = (Z)-N-(tert-butoxy)-2,2-dimethylpropanimidothioic acid; empaSH = (Z)-N-ethoxy-2-methylpropanimidothioic acid), using newly designed N-alkoxy thioamide ligands as precursors for metal chalcogenide materials. All complexes were characterized using various analytical techniques, and the single-crystal structures of complexes 5 and 7 revealed a distorted seesaw geometry in the monomeric SnL2 form. Thermogravimetric (TG) curves showed differences between Ge compounds, which exhibited single-step weight losses, and Sn compounds, which exhibited multistep weight losses. As a result, we suggest that the synthesized complexes 1-8 are potential precursors for group IV metal chalcogenide materials.