Artículo
Spin canting and slow magnetic relaxation in mononuclear cobalt(ii) sulfadiazine ternary complexes
Villa Perez, Cristian
; Zabala Lekuona, Andoni; Vitorica Yrezabal, Iñigo J.; Seco, José Manuel; Cepeda, Javier; Echeverría, Gustavo Alberto
; Soria, Delia Beatriz
Fecha de publicación:
02/2024
Editorial:
Royal Society of Chemistry
Revista:
Dalton Transactions
ISSN:
1477-9226
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Monomeric [Co(SDZ)2phen] (1) and [Co(SDZ)(bq)Cl] (2) complexes (SDZ = sulfadiazine, phen = 1,10-phenanthroline, and bq = 2,2′-biquinoline) have been synthesized and characterized. X-ray diffraction studies indicate that SDZ acts as a bidentate ligand coordinating through the sulfonamide and the pyrimidine N atoms in both compounds. In complex 1, the coordination sphere consists of two SDZ ligands and a bis-chelating phen ligand, giving rise to a CoN6 coordination sphere. On the other hand, 2 has a CoN4Cl core, with two N-atoms from SDZ and two from the bq ligand. Both compounds have been studied by dc and ac magnetometry and shown to display slow magnetic relaxation under an optimum external dc field (1 kOe) at low temperatures. Moreover, compound 2 displays long range magnetic ordering provided by spin-canted antiferromagnetism, which has been characterized by further field-dependent magnetic susceptibility measurements, FC/ZFC curves, hysteresis loops and frequency-independent ac curves. The signs of the calculated D parameters, positive in 1 and negative in 2, have been rationalized according to the two lowest-lying transitions in the orbital energy diagrams derived from ab initio ligand field theory (AILFT). In a subsequent attempt to reveal the possible hidden zero-field SMM behaviour, Ni(ii)-based 3 and Co(ii)-doped Ni(ii)-based (with a Ni : Co ratio of 0.9 : 0.1) heterometallic compound 2Ni were synthesized.
Palabras clave:
slow magnetic
,
cobalt complexes
,
sulfadiazine
,
single molecules magnet
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Articulos(CEQUINOR)
Articulos de CENTRO DE QUIMICA INORGANICA "DR. PEDRO J. AYMONINO"
Articulos de CENTRO DE QUIMICA INORGANICA "DR. PEDRO J. AYMONINO"
Articulos(IFLP)
Articulos de INST.DE FISICA LA PLATA
Articulos de INST.DE FISICA LA PLATA
Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Articulos de SEDE CENTRAL
Citación
Villa Perez, Cristian; Zabala Lekuona, Andoni; Vitorica Yrezabal, Iñigo J.; Seco, José Manuel; Cepeda, Javier; et al.; Spin canting and slow magnetic relaxation in mononuclear cobalt(ii) sulfadiazine ternary complexes; Royal Society of Chemistry; Dalton Transactions; 2-2024; 1-13
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