Pure and mixed {Nd/Yb} carborane-based metal–organic frameworks integrating slow magnetic relaxation, magnetocaloric effect and NIR emission

Liu, Xiaoming ; Arauzo, Ana (Universidad de Zaragoza) ; Fuertes, Sara ; Giner Planas, José ; Bartolomé, Elena

Resumen: Multi-lanthanide metal–organic frameworks (MOFs) offer a flexible route for designing multifunctional materials. Here we report a carborane-based isostructural series of MOFs of formula {[(NdyYb1−y)3(mCB-L)4(NO3)(DMF)x]n·Solv}, including the homometallic Nd (y = 1) and Yb (y = 0) compounds and a mixed Nd/Yb analogue (y = 0.44). Magnetic, magnetocaloric and near-infrared (NIR) optical properties were investigated by dc/ac magnetometry, X-ray absorption spectroscopy (XAS), X-ray magnetic circular dichroism (XMCD), and photoluminescence. Nd3+ and Yb3+ yield MOFs combining slow relaxation of the magnetization (U/kB ∼ 19 K), cryogenic magnetocaloric response (−ΔSm ∼ 1.6 R at 5 T, 1.8 K) and ion-centered NIR luminescence. Notably, the mixed Nd/Yb MOF further extends this multifunctionality by exhibiting dual NIR emission at 998 nm and 1060 nm arising from partial Nd → Yb energy transfer. These results underscore carborane ligands as effective blocks for engineering multi-lanthanide frameworks, and highlight {Nd/Yb} MOFs as multifunctional materials for quantum technologies, optical communication, and cryogenic cooling.

Idioma: Inglés

DOI: 10.1039/d5tc03820k

Año: 2026

Publicado en: Journal of materials chemistry. C (2026), [14 pp.]
ISSN: 2050-7526

Financiación: info:eu-repo/grantAgreement/ES/AEI/CEX2023-001263-S
Financiación: info:eu-repo/grantAgreement/ES/DGA/E12-23R
Financiación: info:eu-repo/grantAgreement/ES/DGA/E17-23R
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PID2022-136892NB-I00
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PID2022-138492NB-I00
Financiación: info:eu-repo/grantAgreement/ES/MICIU/PID2021-122869NB-I00

Tipo y forma: Article (Published version)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)

Dataset asociado: Supplementary Information ( https://www.rsc.org/suppdata/d5/tc/d5tc03820k/d5tc03820k1.pdf)