TY - JOUR
T1 - Slow magnetic relaxation and luminescence properties in neodymium(iii)-4,4,4-trifluoro-1-(2-naphthyl)butane-1,3-dionato complexes incorporating bipyridyl ligands
AU - Vicente, Ramon
AU - Tubau, Ànnia
AU - Speed, Saskia
AU - Mautner, Franz A.
AU - Bierbaumer, Florian
AU - Fischer, Roland C.
AU - Massoud, Salah S.
N1 - Funding Information:
A. T., S. S. and R. V. acknowledge the financial support from Ministerio de Ciencia, Innovación y Universidades (Spain) (Project PGC2018-094031-B-100). The authors also thank one of the reviewers (crystallographic reviewer) for the valuable comments and suggestions to improve structures 2 and 2a. S. S. M. thanks Dr Sushant Sahu (UL Lafayette) for his help in revising the fluorescence spectra.
Publisher Copyright:
© The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.
PY - 2021/8/28
Y1 - 2021/8/28
N2 - Five new eight-coordinated Nd(iii) mononuclear complexes with the formulae [Nd(ntfa)3(EtOH)2] (1), [Nd(ntfa)3(phen)] (2), [Nd(ntfa)3(bipy)] (3), [Nd(ntfa)3(5,5′-Me2bipy)] (4) and [Nd(ntfa)3(4,4′-Mt2bipy)] (5), where ntfa = 4,4,4-trifluoro-1-(naphthalen-2-yl)butane-1,3-dionate, phen = phenanthroline, bipy = 2,2′-dipyridine, 5,5′-Me2bipy = 5,5′-dimethyl-2,2′-dipyridine, and 4,4′-Mt2bipy = 4,4′-dimethoxy-2,2′-dipyridine, were synthesized and structurally characterized. Magnetic measurements were carried out on complexes 2-5. Dynamic magnetic studies revealed single-molecule magnet (SMM) behavior for complexes 2, 4 and 5 with anisotropy energy barriers and preexponential factors of Ueff = 18 cm-1, τ0 = 2.2 × 10-7 s; Ueff = 31 cm-1, τ0 = 1.0 × 10-9 s and Ueff = 19 cm-1, τ0 = 8.7 × 10-8 s, respectively. The ancillary chelating bipyridyl ligands in complexes 2-5 greatly enhance the solid state luminescence emission in the visible and NIR regions through efficient energy transfer from the ligands to the central Nd3+ ion. This study highlights the bifunctionality of the Nd(iii) complexes.
AB - Five new eight-coordinated Nd(iii) mononuclear complexes with the formulae [Nd(ntfa)3(EtOH)2] (1), [Nd(ntfa)3(phen)] (2), [Nd(ntfa)3(bipy)] (3), [Nd(ntfa)3(5,5′-Me2bipy)] (4) and [Nd(ntfa)3(4,4′-Mt2bipy)] (5), where ntfa = 4,4,4-trifluoro-1-(naphthalen-2-yl)butane-1,3-dionate, phen = phenanthroline, bipy = 2,2′-dipyridine, 5,5′-Me2bipy = 5,5′-dimethyl-2,2′-dipyridine, and 4,4′-Mt2bipy = 4,4′-dimethoxy-2,2′-dipyridine, were synthesized and structurally characterized. Magnetic measurements were carried out on complexes 2-5. Dynamic magnetic studies revealed single-molecule magnet (SMM) behavior for complexes 2, 4 and 5 with anisotropy energy barriers and preexponential factors of Ueff = 18 cm-1, τ0 = 2.2 × 10-7 s; Ueff = 31 cm-1, τ0 = 1.0 × 10-9 s and Ueff = 19 cm-1, τ0 = 8.7 × 10-8 s, respectively. The ancillary chelating bipyridyl ligands in complexes 2-5 greatly enhance the solid state luminescence emission in the visible and NIR regions through efficient energy transfer from the ligands to the central Nd3+ ion. This study highlights the bifunctionality of the Nd(iii) complexes.
UR - http://www.scopus.com/inward/record.url?scp=85113173840&partnerID=8YFLogxK
U2 - 10.1039/d1nj02583j
DO - 10.1039/d1nj02583j
M3 - Article
AN - SCOPUS:85113173840
VL - 45
SP - 14713
EP - 14723
JO - New Journal of Chemistry
JF - New Journal of Chemistry
SN - 0398-9836
IS - 32
ER -