N-Alkoxy Carboxamide Stabilized Tin(II) and Germanium(II) Complexes for Thin-Film Applications

A new series of germanium (1–5) and tin (6–10) complexes were successfully synthesized by employing N-alkoxy-functionalized carboxamides as stabilizing ligands, and these complexes could potentially serve as precursors for thin-film applications. All of the complexes were characterized by FTIR and NMR spectroscopy as well as elemental and thermogravimetric (TG) analyses. The single-crystal X-ray diffraction studies of 5 and 10 revealed that they crystalize in the monoclinic space group P2(1)/c as monomers. The metal centers in these complexes are coordinated to four oxygen atoms and display distorted trigonal-bipyramidal geometries. The thermogravimetric analysis and volatility studies of the complexes demonstrated the good volatilities and stabilities of 2–4 and 6–9. Among these complexes, Ge(mdpa)₂(3, mdpaH = N-methoxy-2,2-dimethylpropanamide) and Sn(edpa)₂(9, edpaH = N-ethoxy-2,2-dimethylpropanamide) exhibited excellent physicochemical properties with clean single-step curves and low residual masses in their TG analyses.