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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| Published in | Canadian journal of chemistry Vol. 78; no. 12; pp. 1570 - 1574 |
|---|---|
| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
Ottawa, Canada
NRC Research Press
01.12.2000
Natl Research Council Canada Canadian Science Publishing NRC Research Press |
| Subjects | |
| Online Access | Get full text |
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| Abstract | 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. |
|---|---|
| AbstractList | Diamagnetic niobium and tantalum complexes of general formula [M(eta5-C5Me5)(dithiolene)2] have been prepared (M = Nb, dithiolene - dddt2- (5,6-dihydro-1,4dithiine-2,3-dithiolate) (1); M = Ta, dithiolene - dddt2 (2); M = Nb, dithiolene = dddt 2- and dmit 2- ( 1, 3-dithiole-2-thione-4,5 -dithiol ate) (3)). All these complexes exhibit temperature-dependent 1H NMR spectra which result from a fluxional behavior of the dithiolene ligands. 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. 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. Diamagnetic niobium and tantalum complexes of general formula [M(eta (5)-C5Me5)(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 H-1 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. |
| Abstract_FL | On a préparé des complexes diamagnétiques du niobium et du tantale de formule générale [M(η
5
-C
5
Me
5
)(dithiolène)
2
] [M = Nb, dithiolène = dddt
2
(5,6-dihydro-1,4-dithiine-2,3-dithiolate) (
1
); M = Ta, dithiolène = dddt
2
(
2
); M = Nb, dithiolène = dddt
2
et dmit
2
(1,3-dithiole-2-thione-4,6-dithiolate) (
3
)]. Les spectres RMN
1
H de chacun de ces complexes varient avec la température en raison d'un comportement dynamique des ligands dithiolènes. Les propriétés redox ont été par voltampérométrie cyclique et, pour chacun des complexes
1
et
2
, a été mis mettre en évidence un processus d'oxydation réversibles impliquant les ligands dithiolènes.Mots clés : niobium, tantale, dithiolène, voltampérométrie cyclique, RMN
1
H à température variable.[Traduit par la Rédaction] |
| Author | Guyon, F Jourdain, I V |
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| DOI | 10.1139/v00-144 |
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| Issue | 12 |
| Keywords | 1,3-DITHIOLE-2-THIONE-4,5-DITHIOLATE DMIT dithiolene niobium CHEMISTRY voltammetry cyclic tantalum variable-temperature H-1 NMR |
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| Snippet | 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... Diamagnetic niobium and tantalum complexes of general formula [M(eta (5)-C5Me5)(dithiolene)(2)] have been prepared (M = Nb, dithiolene = dddt(2-)... Diamagnetic niobium and tantalum complexes of general formula [M(eta5-C5Me5)(dithiolene)2] have been prepared (M = Nb, dithiolene - dddt2-... |
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| SubjectTerms | Chemical elements Chemistry Chemistry, Multidisciplinary Electrochemistry Heterocyclic compounds Niobium Organometallic compounds Oxidation Physical Sciences Science & Technology Tantalum |
| Title | Syntheses and electrochemical characterization of heteroleptic cyclopentadienyl-bis(dithiolene) complexes of niobium and tantalum |
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