TY - JOUR
T1 - Multifunctionality of the [C2mim][Ln(fod)4] series (Ln = Nd-Tm except Pm)
T2 - magnetic, luminescence and thermochemical studies
AU - Cerdeira, Ana C.
AU - Leal, João P.
AU - Avó, João
AU - Viola, Catarina
AU - Casimiro, Maria H.
AU - Ferreira, Luís M.
AU - Paz, Filipe A. A.
AU - Pereira, Laura C. J.
AU - Pereira, Cláudia C. L.
AU - Monteiro, Bernardo
N1 - Funding Information:
This research was funded by FCT – Fundação para a Ciência e a Tecnologia, I. P. through the National Infrastructure Roadmap, LTHMFL-NECL, LISBOA-01-0145-FEDER-022096 and contract UID/Multi/04349/2019 (L. C. J. P.; A. C. C.), grants UIDB/00100/2020 (J. P. L. and B. M.), BL156/2019_IST-ID (A. C. C.), contract no. IST-ID/077/2018 (B. M.), Norma transitória DL 57/2016 Program Contract (C. C. L. P). SFRH/BPD/120599/2016 (J. A.) and PTDC/QUI-QFI/32007/2017 (J. A.). This work was funded by the Associated Laboratory for Sustainable Chemistry-Clean Processes and Technologies- LAQV, which is financed by the National funds from FCT/MEC grant UID/QUI/50006/2019 (C. C. L. P) and co-financed by the ERDF under the PT2020 Partnership Agreement project POCI-01-0145-FEDER – 007265 (C. C. L. P). This research was funded by FCT – Fundação para a Ciência e a Tecnologia, I. P. under grants SFRH/BPD/120599/2016 and PTDC/QUI-QFI/32007/2017. Centro de Química Estrutural (CQE) and Institute of Molecular Sciences (IMS) acknowledge the financial support of Fundação para a Ciência e Tecnologia through Projects UIDB/00100/2020, UIDP/00100/2020, and LA/P/0056/2020, respectively.
Publisher Copyright:
© 2022 The Royal Society of Chemistry
PY - 2022/4
Y1 - 2022/4
N2 - A series of nine tetrakis lanthanide β-diketonate complexes of the type [C2mim][Ln(fod)4] (C2mim = 1-ethyl-3-methylimidazolium, fod = 6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedionate) were prepared, with yields above 80%, and their thermochemical, photophysical and magnetic susceptibilities were evaluated. Thermochemical studies presented a rare and reversible conversion between two solid phases (polymorphism), characteristic of the [Ln(fod)4]− anion. Photophysical and magnetic studies revealed that Dy and Er presented the multifunctionality of being simultaneously SMMs and visible (Dy) or near infra-red (Er) emitters. The Nd, Ho and Tm analogues present characteristic emission bands in the NIR region (800-1200 nm), while Sm, Eu, Tb and Dy present emissions in the visible range. Magnetic susceptibility of Tb, Dy, Ho, Er and Tm salts were measured in the temperature range of 2-300 K, showing paramagnetic behaviour, although with different regimes, with AC susceptibility measurements, at different frequencies in the range of 10-10 000 Hz, providing evidence of slow magnetic relaxation processes for Gd, Dy and Er analogues with SMM behavior.
AB - A series of nine tetrakis lanthanide β-diketonate complexes of the type [C2mim][Ln(fod)4] (C2mim = 1-ethyl-3-methylimidazolium, fod = 6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedionate) were prepared, with yields above 80%, and their thermochemical, photophysical and magnetic susceptibilities were evaluated. Thermochemical studies presented a rare and reversible conversion between two solid phases (polymorphism), characteristic of the [Ln(fod)4]− anion. Photophysical and magnetic studies revealed that Dy and Er presented the multifunctionality of being simultaneously SMMs and visible (Dy) or near infra-red (Er) emitters. The Nd, Ho and Tm analogues present characteristic emission bands in the NIR region (800-1200 nm), while Sm, Eu, Tb and Dy present emissions in the visible range. Magnetic susceptibility of Tb, Dy, Ho, Er and Tm salts were measured in the temperature range of 2-300 K, showing paramagnetic behaviour, although with different regimes, with AC susceptibility measurements, at different frequencies in the range of 10-10 000 Hz, providing evidence of slow magnetic relaxation processes for Gd, Dy and Er analogues with SMM behavior.
UR - http://www.scopus.com/inward/record.url?scp=85131431744&partnerID=8YFLogxK
U2 - 10.1039/d2nj01415g
DO - 10.1039/d2nj01415g
M3 - Article
AN - SCOPUS:85131431744
SN - 1144-0546
VL - 46
SP - 9858
EP - 9870
JO - New Journal of Chemistry
JF - New Journal of Chemistry
IS - 20
ER -