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 - info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FMulti%2F04349%2F2019/PT#
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00100%2F2020/PT#
info:eu-repo/grantAgreement/FCT/OE/SFRH%2FBPD%2F120599%2F2016/PT#
info:eu-repo/grantAgreement/FCT/Concurso para Financiamento de Projetos de Investigação Científica e Desenvolvimento Tecnológico em Todos os Domínios Científicos - 2017/PTDC%2FQUI-QFI%2F32007%2F2017/PT#
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FQUI%2F50006%2F2019/PT#
info:eu-repo/grantAgreement/FCT/OE/SFRH%2FBPD%2F120599%2F2016/PT#
info:eu-repo/grantAgreement/FCT/Concurso para Financiamento de Projetos de Investigação Científica e Desenvolvimento Tecnológico em Todos os Domínios Científicos - 2017/PTDC%2FQUI-QFI%2F32007%2F2017/PT#
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00100%2F2020/PT#
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F00100%2F2020/PT#
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0056%2F2020/PT#
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, grants 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). 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 co-financed by the ERDF under the PT2020 Partnership Agreement project POCI-01-0145-FEDER – 007265 (C. C. L. P).
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 -