Synthesis and crystal structures of bis-[1-oxopyridin-2-olato(1-)]bis-(penta-fluoro-phen-yl)silicon(IV)-tetra-hydro-furan-pentane (2/1/1), bis-[1-oxopyridin-2-olato(1-)]bis-(-tol-yl)silicon(IV), and dimesitylbis[1-oxopyridin-2-olato(1-)]silicon(IV).

The neutral organosilicon(IV) complex, (CF)Si(OPO) (OPO = 1-oxopyridin-2-one, CHNO), was synthesized from (CF)Si(OCH) and 2 equiv. of 1-hy-droxy-pyridin-2-one in tetra-hydro-furan (THF). Single crystals grown from the diffusion of -pentane into a THF solution were identified as a THF hemisolvate and an -pentane hemisolvate, (CF)Si(OPO)·0.5THF·0.5CH (). -Tol-ylSi(OPO) () and mesit-ylSi(OPO) () crystallized directly from reaction mixtures of 2 equiv. of MeSi(OPO) with -tol-ylSiCl and mesit-ylSiCl, respectively, in aceto-nitrile. The oxygen-bonded carbon and nitro-gen atoms of the OPO ligands in , , and were modeled as disordered indicating co-crystallization of up to three possible diastereomers in each. Solution NMR studies support the presence of exclusively the all- isomer in and multiple isomers in . Poor solubility of limited its characterization in solution.