ELECTROCHEMICAL EVIDENCE OF THE REORIENTATION OF ALKYNES ON TRIMETALLIC CLUSTERS DURING A 2-ELECTRON REDUCTION

Citation
D. Osella et al., ELECTROCHEMICAL EVIDENCE OF THE REORIENTATION OF ALKYNES ON TRIMETALLIC CLUSTERS DURING A 2-ELECTRON REDUCTION, Organometallics, 12(8), 1993, pp. 3140-3144
Citations number
29
Categorie Soggetti
Chemistry Inorganic & Nuclear","Chemistry Inorganic & Nuclear
Journal title
ISSN journal
02767333
Volume
12
Issue
8
Year of publication
1993
Pages
3140 - 3144
Database
ISI
SICI code
0276-7333(1993)12:8<3140:EEOTRO>2.0.ZU;2-F
Abstract
The electrochemical two-electron reduction of isoelectronic and isostr uctural alkyne clusters of iron and osmium has been investigated by fa st-scan cyclic voltammetry. Both Fe3(CO)9-(EtC=CEt) and OS3(CO)7(Ph2PC H2PPh2)(PhC=CPh) undergo a two-electron reduction. While Fe3(CO)9(EtC= CEt) is reduced in two separate one-electron waves, OS3(CO)7(Ph2PCH2PP h2)(PhC=CPh) displays a single two-electron wave. Fast-scan voltammetr y detects one additional adsorption post-peak for the iron cluster whi ch, under certain experimental conditions, gives rise to apparent anom alous shapes of voltammograms. Differences in electrochemical pattern of iron and osmium title compounds are interpreted on the basis of fol low-up and concomitant isomerization reactions with respect to the fir st electron transfer, respectively.