Syntheses and electrochemical characterization of heteroleptic cyclopentadienyl-bis(dithiolene) complexes of niobium and tantalum

Diamagnetic niobium and tantalum complexes of general formula [M(η 5 -C 5 Me 5 )(dithiolene) 2 ] have been prepared (M = Nb, dithiolene = dddt 2– (5,6-dihydro-1,4dithiine-2,3-dithiolate) ( 1 ); M = Ta, dithiolene = dddt 2– ( 2 ); M = Nb, dithiolene = dddt 2– and dmit 2– (1,3-dithiole-2-thione-4,5-di...

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Bibliographic Details
Published inCanadian journal of chemistry Vol. 78; no. 12; pp. 1570 - 1574
Main Authors Jourdain, I V, Guyon, F
Format Journal Article
LanguageEnglish
Published Ottawa, Canada NRC Research Press 01.12.2000
Natl Research Council Canada
Canadian Science Publishing NRC Research Press
Subjects
Chemical elements
Chemistry
Chemistry, Multidisciplinary
Electrochemistry
Heterocyclic compounds
Niobium
Organometallic compounds
Oxidation
Physical Sciences
Science & Technology
Tantalum
1,3-DITHIOLE-2-THIONE-4,5-DITHIOLATE DMIT
dithiolene
niobium
CHEMISTRY
voltammetry cyclic
tantalum
variable-temperature H-1 NMR
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Summary:Diamagnetic niobium and tantalum complexes of general formula [M(η 5 -C 5 Me 5 )(dithiolene) 2 ] have been prepared (M = Nb, dithiolene = dddt 2– (5,6-dihydro-1,4dithiine-2,3-dithiolate) ( 1 ); M = Ta, dithiolene = dddt 2– ( 2 ); M = Nb, dithiolene = dddt 2– and dmit 2– (1,3-dithiole-2-thione-4,5-dithiolate) ( 3 )). All these complexes exhibit temperature-dependent 1 H NMR spectra which result from a fluxional behavior of the dithiolene ligands. Their redox properties have been investigated by cyclic voltammetry and reversible oxidation processes involving the dithiolene ligands have been evidenced for the complexes 1 and 2 .Key words: niobium, tantalum, dithiolene, voltammetry cyclic, variable-temperature 1 H NMR.
ISSN:0008-4042
1480-3291
DOI:10.1139/v00-144