Ladder–like diferrocenyloxytetraalkyldistannoxanes

Publication date: 1 September 2018Source: Journal of Organometallic Chemistry, Volume 870Author(s): Peter Frenzel, Marcus Korb, Alexander Hildebrandt, Heinrich LangAbstractTitle compounds {[R2Sn(OFc)]2O}2 (3a, R = nBu; 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 E1°' = −477 mV (ΔEp = 65 mV), E2°' = −377 mV (ΔEp = 70 mV) and E3°' = −87 mV (ΔEp = 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 abstractThe synthesis and molecular solid state structures of {[R2Sn(OFc)]2O}2 (Fc = Fe(ƞ5–C5H4) (ƞ5–C5H5); R = Me, nBu) are reported. (Spectro)electrochemical studies on {[nBu2Sn(OFc)]2O}2 c...

Source: Journal of Organometallic Chemistry - July 5, 2018 Category: Chemistry Source Type: research