A unique tetramer of 4 ∶ 5 β-cyclodextrin–ferrocene in the solid state

Abstract

A single crystal of a unique 4 ∶ 5 inclusion complex between β-cyclodextrin and ferrocene was prepared and the structure was determined by X-ray crystallographic analysis, showing that four of the five ferrocenes were included in the cavities of four β-cyclodextrins along the axial orientation of the tetramer, while another was co-included between two β-cyclodextrins from the equatorial orientation.