Helicene Bis(pyrazol-1-yl)pyridine Ligands for Luminescent Transition-Metal Complexes - Université d'Angers Accéder directement au contenu
Article Dans Une Revue European Journal of Inorganic Chemistry Année : 2019

Helicene Bis(pyrazol-1-yl)pyridine Ligands for Luminescent Transition-Metal Complexes

Alexandre Abhervé
  • Fonction : Auteur
  • PersonId : 1064335
Kevin Martin
  • Fonction : Auteur
Narcis Avarvari

Résumé

We describe herein the synthesis of 2,6‐bis(pyrazol‐1‐yl)pyridine (1‐bpp) ligands substituted by helicene units in the 4‐position of the pyridine ring. The two‐step procedure afforded the molecules bpp[n]helicene (n = 4, 5 and 6) and methyl‐bpp[4]helicene, abbreviated as 4, 5, 6 and 4m respectively, with overall good yields. This series of ligands shows fluorescence in the violet region, with a red shift of the emission when increasing the number of aromatic rings in the helicene unit. The tridentate fluorophores have been reacted with Re(CO)5Cl and [Ru(terpy)Cl3] to prepare a series of transition metal complexes formulated as [ReI(n)(CO)3Cl] (n = 4 and 5) and [RuII(n)(terpy)](PF6)2 (n = 4, 4m, 5 and 6). The compounds [ReI(4)(CO)3Cl]·(CH2Cl2)0.5(H2O) and [RuII(4m)(terpy)](PF6)2 crystallized in the centrosymmetric space groups P21/n and P1 respectively, and thus present both M and P helicene units in their crystal structures. The absorption and emission properties of the complexes have been studied. All complexes show luminescence at 77 K in frozen DCM solution. The tricarbonyl complex [ReI(5)(CO)3Cl] shows a strong emission band with two peaks at 540 nm and 580 nm, which could be attributed to ligand‐localized π–π* phosphorescence due to the extended π system of the ligand. The heteroleptic RuII complexes show emission bands above 600 nm attributed to the terpyridine‐based 3MLCT state.
Fichier principal
Vignette du fichier
bpp-hel_EurJIC_revised.pdf (1.5 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-02469020 , version 1 (30-11-2020)

Identifiants

Citer

Alexandre Abhervé, Kevin Martin, Andreas Hauser, Narcis Avarvari. Helicene Bis(pyrazol-1-yl)pyridine Ligands for Luminescent Transition-Metal Complexes. European Journal of Inorganic Chemistry, 2019, 2019 (45), pp.4807-4814. ⟨10.1002/ejic.201900870⟩. ⟨hal-02469020⟩
38 Consultations
40 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More