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Single molecule magnet features in luminescent lanthanide coordination polymers with heptacoordinate Dy/Yb() ions as nodes
Ist Teil von
Dalton transactions : an international journal of inorganic chemistry, 2023-09, Vol.52 (36), p.12686-12694
Ort / Verlag
England: Royal Society of Chemistry
Erscheinungsjahr
2023
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Two sets of 1D/2D lanthanide coordination polymers with formulas of Ln(oqa)
3
·2H
2
O [Hoqa = 2-(4-oxoquinolin-1(4
H
)-yl) acetic acid, Ln = Dy (
1
), Yb (
2
)] and Ln(oaa)
2
(HCOO)(H
2
O) [Hoaa = 2-(9-oxoacridin-10(9
H
)-yl) acetic acid, Ln = Dy (
3
), Yb (
4
)] have been synthesized and their physical properties were investigated. All four complexes are constructed from seven-coordinate lanthanide ions and corresponding organic linkers. The lanthanide ions in
1
and
2
adopt a pentagonal bipyramid coordination geometry, whereas the coordination geometry of lanthanide ions in
3
and
4
can be described as a capped octahedron. Slow magnetic relaxation behaviors were observed in these four products at a zero/non-zero static magnetic field. Complexes
1
,
2
and
4
exhibit the characteristic emission of Ln(
iii
) ions, whereas complex
3
shows ligand-based emission. Bright yellow light emission was also observed when a voltage was applied, demonstrating the potential of
1
for application in light-emitting diodes (LEDs). Compounds
3
and
4
are the first examples of lanthanide complexes based on Hoaa ligands.
Four 1D/2D coordination polymers constructed from low-coordinate lanthanide ions and organic linkers with interesting magnetic and luminescence properties are reported.