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Verfasst von:Kruck, Matthias [VerfasserIn]   i
 Sauer, Désirée C. [VerfasserIn]   i
 Enders, Markus [VerfasserIn]   i
 Wadepohl, Hubert [VerfasserIn]   i
 Gade, Lutz H. [VerfasserIn]   i
Titel:Bis(2-pyridylimino)isoindolato iron(II) and cobalt(II) complexes
Titelzusatz:Structural chemistry and paramagnetic NMR spectroscopy
Verf.angabe:Matthias Kruck, Désirée C. Sauer, Markus Enders, Hubert Wadepohl and Lutz H. Gade
E-Jahr:2011
Jahr:20 Jun 2011
Umfang:10 S.
Fussnoten:Gesehen am 11.07.2022
Titel Quelle:Enthalten in: Dalton transactions
Ort Quelle:London : Soc., 1972
Jahr Quelle:2011
Band/Heft Quelle:40(2011), 40, Seite 10406-10415
ISSN Quelle:1477-9234
Abstract:Condensation of phthalodinitrile and 2-amino-5,6,7,8-tetrahydroquinoline gave the bis(2-pyridylimino)isoindole protioligand 1 (thqbpiH) in high yield. Deprotonation of thqbpiH (1) using LDA in THF at −78 °C yields the corresponding lithium complex [Li(THF)(thqbpi)] (2) in which the lithium atom enforces almost planar arrangement of the tridentate ligand, with an additional molecule of THF coordinated to Li. Reaction of cobalt(II) chloride or iron(II) chloride with one equivalent of the lithium complex 2 in THF led to formation of the metal complexes [CoCl(THF)(thqbpi)] (3a) and [FeCl(THF)(thqbpi)] (3b). The paramagnetic susceptibility of 3a,b in solution was measured by the Evans method (3a: μeff = 4.17 μB; 3b: μeff = 5.57 μB). Stirring a solution of 1 and cobalt(II) acetate tetrahydrate in methanol yielded the cobalt(II) complex 4 which was also accessible by treatment of 3a with one equivalent of silver or thallium acetate in DMSO. Whereas 3a,b were found to be mononuclear in the solid state, the acetate complex 4 was found to be dinuclear, the two metal centres being linked by an almost symmetrically bridging acetate. For all transition metal complexes paramagnetic 1H as well as 13C NMR spectra were recorded at variable temperatures. The complete assignment of the paramagnetic NMR spectra was achieved by computation of the spin densities within the complexes using DFT. The proton NMR spectra of 3a and 3b displayed dynamic behaviour. This was attributed to the exchange of coordinating solvent molecules by an associative mechanism which was analysed using lineshape analysis (ΔS≠= −154 ± 25 J mol−1 K−1 for 3a and ΔS≠ = −168 ± 15 J mol−1 K−1 for 3b).
DOI:doi:10.1039/C1DT10617A
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext ; Verlag: https://doi.org/10.1039/C1DT10617A
 Volltext: https://pubs.rsc.org/en/content/articlelanding/2011/dt/c1dt10617a
 DOI: https://doi.org/10.1039/C1DT10617A
Datenträger:Online-Ressource
Sprache:eng
Bibliogr. Hinweis:Erscheint auch als : Druck-Ausgabe: Bis(2-pyridylimino)isoindolato iron(II) and cobalt(II) complexes. - 2011
K10plus-PPN:1809687535
Verknüpfungen:→ Zeitschrift

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