Dodecanuclear [NiII8Ln₄] clusters and rings of corner-sharing {NiII2Ln₂} cubanes (Ln = Dy, Gd, Y); magnetic and magnetothermal properties

Tziotzi, Thomais G. ; Agapaki, Eleftheria ; Charkiolakis, Emmanouil K. ; Gracia, David ; Ubach I. Cervera, Marc ; Dalgarno, Scott J. ; Evangelisti, Marco ; Brechin, Euan K. ; Milios, Constantinos J.

Resumen: The solvothermal reaction of NiCl2·6H2O with 1,3,5-tri(2-hydroxyethyl)-1,3,5-triazacyclohexane, LH3, and Ln(OAc)3·4H2O in the presence of salicylaldehyde in MeOH leads to the formation of the dodecanuclear isostructural species [NiII8Ln4(L′)8(OAc)4(OH)8(H2O)4]·xH2O (Ln = Dy, x = 6 (1); Gd, x = 24 (2); Y, x = 10 (3); L′ = the dianion of the Schiff-base resulting from the reaction of salicylaldehyde and ethanolamine). The metallic core of the clusters describes a ring of corner-sharing {Ni2Ln2} cubanes assembled on a central, planar rectangular {Ln4} unit. Magnetization studies conducted on complexes 1–3 demonstrate the presence of dominant ferromagnetic exchange at low temperatures, which is largely attributed to the Ni⋯Ni interactions. The significant magnetocaloric effect observed in the Gd analogue has been assessed through heat capacity and magnetization measurements.

Idioma: Inglés

DOI: 10.1039/d5dt00175g

Año: 2025

Publicado en: Dalton Transactions 54, 11 (2025), 4664-4671
ISSN: 1477-9226

Financiación: info:eu-repo/grantAgreement/ES/AEI/CEX2023-001286-S
Financiación: info:eu-repo/grantAgreement/ES/DGA/E11-23R
Financiación: info:eu-repo/grantAgreement/ES/DGA/E12-23R
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PID2021-124734OB-C21

Tipo y forma: Artículo (Versión definitiva)