Cover Feature: The Missing Parent Compound [(C5H5)Fe( 5-P5)]: Synthesis, Characterization, Coordination Behavior and Encapsulation (Chem. Eur. J. 27/2021) CuI halides, host-guest chemistry, parent pentaphosphaferrocene, phosphaferrocene, supramolecular chemistry Keywords: CuI halides; host-guest chemistry; parent pentaphosphaferrocene; phosphaferrocene; supramolecular chemistry EN CuI halides host-guest chemistry parent pentaphosphaferrocene phosphaferrocene supramolecular chemistry 7470 7470 1 05/17/21 20210512 NES 210512 B The discovery of parent pentaphosphaferrocene [CpFe( SP 5 sp -P SB 5 sb )] b has been achieved after more than 30 years, closing the gap within the large class of pentaphosphaferrocenes; the cover image depicts the parent compound taking its proper place on the family tree.