Benzilato(2−)- O1, O2]bis[1,3-diphenylpropane-1,3-dionato(1−)- O, O]silicon(IV): a neutral heteroleptic hexacoordinate silicon(IV) complex with an SiO 6 skeleton

Abstract

Reaction of tetramethoxysilane with 1,3-diphenylpropane-1,3-dione and benzilic acid (molar ratio 1:2:1) in tetrahydrofuran/ n-pentane yielded the neutral heteroleptic hexacoordinate silicon(IV) complex [benzilato(2−)- O 1, O 2]bis[1,3-diphenylpropane-1,3-dionato(1−)- O, O]silicon(IV) ( 5). Compound 5 was structurally characterized by single-crystal X-ray diffraction, solid-state VACP/MAS NMR spectroscopy ( 29Si), and solution NMR spectroscopy ( 1H, 13C, 29Si). The chiral silicon(IV) complex, with its octahedral SiO 6 coordination polyhedron, is configurationally stable in solution on the NMR time scale (solvent: CDCl 3; maximum temperature studied: 58 °C).