Effect of Coordination Geometry on Magnetic Properties in a Series of Cobalt(II) Complexes and Structural Transformation in Mother Liquor - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Inorganic Chemistry Année : 2020

Effect of Coordination Geometry on Magnetic Properties in a Series of Cobalt(II) Complexes and Structural Transformation in Mother Liquor

Résumé

The three Co(II) complexes [Co(bbp) 2 ][Co(NCS) 4 ]•4DMF (1), [Co(bbp)(NCS) 2 (DMF)]•2DMF (2), and [Co(bbp)(NCS) 2 ] (3) have been synthesized and characterized by single-crystal X-ray diffraction, magnetic, and various spectroscopic techniques. Complexes 1 and 3 are obtained by the reaction of Co(NCS) 2 with 2,6-bis(1H-benzo[d]imidazol-2yl)pyridine (bbp), and complex 1 undergoes a structural transformation to form complex 2. A single-crystal X-ray study revealed that complex 1 is comprised of two Co(II) centers, a cationic octahedral Co(II) unit and an anionic tetrahedral Co(II) unit, while the Co(II) ion is in a distorted-octahedral environment in 2. Moreover, in complex 3, the Co(II) ion is in a distorted-square-pyramidal geometry. The effect of coordination geometry on the magnetic properties was studied by both static and dynamic magnetic measurements. Direct current (dc) magnetic susceptibility measurements showed that all of the Co(II) ions are in high-spin state in these complexes. Alternating current (ac) magnetic susceptibility measurements indicated that complexes 2 and 3 display slow relaxation of magnetization in an external dc magnetic field, while complex 1 displayed no such property. EPR experiments and theoretical calculations were consistent with the above findings.

Domaines

Matériaux
Fichier principal
Vignette du fichier
HALnorgchem.0c00538_Noname.pdf (6.44 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03086324 , version 1 (22-12-2020)

Identifiants

Citer

Subrata Ghosh, Sujit Kamilya, Mayurika Das, Sakshi Mehta, Marie-Emmanuelle Boulon, et al.. Effect of Coordination Geometry on Magnetic Properties in a Series of Cobalt(II) Complexes and Structural Transformation in Mother Liquor. Inorganic Chemistry, 2020, 59, pp.7067 - 7081. ⟨10.1021/acs.inorgchem.0c00538⟩. ⟨hal-03086324⟩

Collections

CNRS INC-CNRS
34 Consultations
165 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More