Unveiling single-ion magnetism in lanthanide–coumarin carboxylate coordination polymers
Three new coordination polymers, [Ln(3-CCA)<sub>3</sub>(H<sub>2</sub>O)<sub>2</sub>·2H<sub>2</sub>O]<sub><i>n</i></sub> (Ln = Gd (1), Tb (2), Dy (3)), were synthesized through reaction between the above-mentioned lanthanide ions and coumarin-3-carboxylic acid (3-CCA). Single-crystal and powder X-ray diffraction analyses revealed that complex 1 exhibits a nona-coordination, whereas complexes 2 and 3 adopt an octa-coordinated geometry. The chemical composition of the complexes was confirmed by FTIR and CHN analyses, while their phase purity was verified by powder X-ray diffraction. DC magnetic measurements revealed the presence of weak ferromagnetic interactions between the Ln ions in 1. Moreover, the magnetocaloric properties of this compound were investigated and its performance was evaluated using the Temperature-Averaged Entropy Change (TEC) parameter. Additionally, AC magnetic susceptibility measurements revealed field-induced single-ion magnet (SIM) behavior at low temperatures for complexes 2 and 3.
Authors
- L. Ghivelder
- A. A. Mendonça
- Guilherme P. Guedes (ORCID: https://orcid.org/0000-0001-6138-9943)
- Davor L. Mariano
- Henrique V. P. Hollauer
- Renan Farias
- Stephane Serge Yves Jerome Soriano
- Livia Batista Lopes Escobar
Institutions
- Universidade Federal do Rio de Janeiro (BR)
- Universidade Federal Fluminense (BR)
- Universidade Estadual de Campinas (UNICAMP) (BR)
- Pontifícia Universidade Católica do Rio de Janeiro (BR)
Publication Details
- Journal
- Dalton Transactions
- Published
- 2026-01-01
- DOI
- https://doi.org/10.1039/d5dt02478a
- Primary Topic
- Magnetism in coordination complexes
- Type
- article
- Field-Weighted Citation Impact
- 0.00