Syntheses and crystal structures of ethyltin complexes with ferrocenecarboxylic acid

Abstract

Three new ethyltin complexes containing ferrocenecarboxylate, Et2Sn(OC(O)Fc)2 (1), [(Et2SnOC(O)Fc)2O]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 Sn⋯O 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.

Keywords

• organotin
• ferrocenecarboxylic acid
• crystal structure