Ladder –like diferrocenyloxytetraalkyldistannoxanes

Publication date: 1 September 2018 Source:Journal of Organometallic Chemistry, Volume 870 Author(s): Peter Frenzel, Marcus Korb, Alexander Hildebrandt, Heinrich Lang Title compounds {[R2Sn(OFc)]2O}2 (3a, R =  n Bu; 3b, R = Me; Fc = Fe(ƞ5–C5H4) (ƞ5–C5H5)) are accessible by treatment of R2SnO (2a,b) with equimolar amounts of FcOH (1). The molecular structures of 3a,b in the solid state confirm their planar character, consisting of three, four–membered Sn2O2 rings with penta–coordinated Sn, tri–coordinated O atoms and the alkyl groups protruding above and below the Sn4O6 motif. Organometallic stannoxane 3a was subjected to electrochemical studies as cyclic voltammetry and square wave voltammetry, showing three reversible redox processes at E 1°' = −477 mV (ΔE p = 65 mV), E 2°' = −377 mV (ΔE p = 70 mV) and E 3°' = −87 mV (ΔE p = 90 mV) vs FcH/FcH+. The first two events are one–electron processes and can be assigned to the exocyclic Fc groups, while the oxidations of the two endocyclic FcO units occur in close proximity. UV–Vis/NIR spectroelectrochemical measurements confirmed that the redox splitting is caused by electrostatic interactions between the ferrocenium moieties as oxidation progresses. Graphical abstract

Source: Journal of Organometallic Chemistry - June 30, 2018 Category: Chemistry Source Type: research