Antiferromagnetic coupling in copper(II)porphyrin dimers linked by copper(II) or palladium(II) ion

Mary-Ambre Carvalho (1) , Hervé Dekkiche (1) , Sébastien Richeter (2) , Corinne Bailly (1) , Lydia Karmazin (1) , Declan Mckearney (3) , Daniel Leznoff (3) , Guillaume Rogez (4) , Bertrand Vileno (1) , Sylvie Choua (1) , Romain Ruppert (1)

1 Institut de Chimie de Strasbourg
2 ICGM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier
3 SFU.ca - Simon Fraser University = Université Simon Fraser
4 IPCMS - Institut de Physique et Chimie des Matériaux de Strasbourg

The synthesis of porphyrin dimers linked by metal ions is described and the X-ray structure of two new dimers is presented. As previously shown for diamagnetic metal ions, strong electronic interactions between the individual subunits were observed. Antiferromagnetic coupling between copper(II) porphyrins linked by palladium(II) or copper(II) ion was studied by EPR and SQUID measurements. For the palladium(II) linked dimer, the very small antiferromagnetic coupling was estimated by EPR measurements (J <-1 cm-1). For the trinuclear copper(II) linked dimer, a large antiferromagnetic coupling between the copper(II) ions was measured. In this trinuclear compound, the linking copper(II) ion is used as a relay to increase the interaction between the two copper(II)porphyrins.

Mots clés: Porphyrinoids; copper(II)porphyrin; porphyrin dimers; magnetic interactions; antiferromagnetic coupling

Domaines: Chimie de coordination

Mary-Ambre Carvalho, Hervé Dekkiche, Sébastien Richeter, Corinne Bailly, Lydia Karmazin, et al.. Antiferromagnetic coupling in copper(II)porphyrin dimers linked by copper(II) or palladium(II) ion. Journal of Porphyrins and Phthalocyanines, 2020, 24 (01n03), pp.238-246. ⟨10.1142/S1088424619501037⟩. ⟨hal-02391346⟩