Electrochemical Evidence of the Reorientation of Alkynes on Trimetallic Clusters during a Two-Electron Reduction

Domenico Osella, Lubomir Pospisil, Jan Fiedler

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Abstract

The electrochemical two-electron reduction of isoelectronic and isostructural alkyne clusters of iron and osmium has been investigated by fast-scan cyclic voltammetry. Both Fe3(CO)9(EtCCEt) and Os3(CO)7(Ph2PCH2PPh2) (PhCCPh) undergo a two-electron reduction. While Fe3(CO)9(EtCCEt) is reduced in two separate one-electron waves, Os3(CO)7(Ph2PCH2PPh2)(PhCCPh) displays a single two-electron wave. Fast-scan voltammetry detects one additional adsorption post-peak for the iron cluster which, under certain experimental conditions, gives rise to apparent anomalous shapes of voltammograms. Differences in electrochemical pattern of iron and osmium title compounds are interpreted on the basis of follow-up and concomitant isomerization reactions with respect to the first electron transfer, respectively.

Lingua originaleInglese
pagine (da-a)3140-3144
Numero di pagine5
RivistaOrganometallics
Volume12
Numero di pubblicazione8
DOI
Stato di pubblicazionePubblicato - 1993
Pubblicato esternamente

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