Half-sandwich molybdenum(III) compounds containing diazadiene ligands and their use in the controlled radical polymerization of styrene - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Organometallic Chemistry Année : 2002

Half-sandwich molybdenum(III) compounds containing diazadiene ligands and their use in the controlled radical polymerization of styrene

Résumé

The reaction of CpMoCl2 with diazadiene ligands RN=CH-CH=NR (R2-dad) affords the corresponding paramagnetic complexes CpMoCl2(R2-dad) (R = Ph, 1; p-Tol, 2; C6H3Pri2-2,6, 3; and Pri, 4). All compounds have been characterized by EPR spectroscopy and have been investigated by cyclic voltammetry. They display one-electron oxidation and reduction processes, these being reversible or irreversible depending on the nature of R. The irreversibility of the reduction wave is due to a chemical follow-up process which consists of chloride loss from the reduced product. This phenomenon is suppressed ion the presence of excess chloride in solution. An X-ray structure of 3 verifies the mononuclear natureof the compound and the chelating mode of the dad ligand, the MoN2C2 ring being essentially planar. The N-C and C-C bond distance pattern suggests the important contribution of an enediamido Mo(V) limiting form. In the presence of 1-bromoethylbenzene, complexes 1-4 catalyze the controlled/”living” radical polymerization of styrene. Complex 3 also leads to a controlled/”living” radical polymerization of styrene in the presence of AIBN as a radical generator. Therefore, this is the second example of a compound which is capable of controlling the styrene radical polymerization under both ATRP and SFRP conditions.
Fichier principal
Vignette du fichier
175-10.1016-S0022-328X(02)01878-8-Accepted.pdf (862.58 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03283779 , version 1 (19-07-2021)

Identifiants

Citer

François Stoffelbach, Rinaldo Poli, Philippe Richard. Half-sandwich molybdenum(III) compounds containing diazadiene ligands and their use in the controlled radical polymerization of styrene. Journal of Organometallic Chemistry, 2002, 663 (1-2), pp.269-276. ⟨10.1016/S0022-328X(02)01878-8⟩. ⟨hal-03283779⟩
12 Consultations
47 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More