Syntheses and crystal structures of ethyltin complexes with ferrocenecarboxylic acid

Three new ethyltin complexes containing ferrocenecarboxylate, Et2Sn(OC(O)Fc)(2) (1), [(Et2SnOC(O)Fc)(2)O](2) (2), and [EtSn(O)OC(O)Fc](6) (3) (Fc = C5H5FeC5H4), have been synthesized by the reaction of diethyltin dichloride with ferrocenecarboxylic acid in the presence of potassium hydroxide and characterized by means of elemental analysis, FT-IR, NMR spectroscopy, and X-ray single crystal diffraction. In solid state, 1 is a weak dimer possessing a cyclic Sn2O2 unit formed by the intermolecular SnMIDLINE HORIZONTAL ELLIPSISO interaction, and the tin atom has a distorted pentagonal bipyramid geometry. Compound 2 is a four-tin nuclear diethyltin complex with a ladder framework, and each tin atom adopts a distorted trigonal bipyramidal configuration in which two oxygen atoms occupy the axial positions. Compound 3 is a hexa-tin nuclear monoethyltin complex having a drum-shaped structure, and each of the tin atoms possesses a distorted octahedral geometry. The ferrocene units are attached to the tin atoms through the monodentate or bidentate coordinated carboxylates.

Automated summary

Three new ethyltin complexes containing ferrocenecarboxylate have been synthesized and characterized. They exhibit different geometric structures and coordination modes in the solid state.