Laddere-like diferrocenyloxytetraalkyldistannoxanes

Peter Frenzel, Marcus Korb, Alexander Hildebrandt, Heinrich Lang

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Abstract

Title compounds {[R2Sn(OFc)](2)O}(2) (3a, R = Bu-n; 3b, R = Me; Fc = Fe(eta(5)-C5H4) (eta(5)-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 degrees' = -477mV (Delta E-p = 65 mV), E2 degrees' = -377mV (Delta E-p = 70 mV) and E3 degrees' = -87 mV (Delta E-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. (C) 2018 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)104-109
Number of pages6
JournalJournal of Organometallic Chemistry
Volume870
DOIs
Publication statusPublished - 1 Sep 2018
Externally publishedYes

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