Near-infrared luminescence and magnetic properties of dinuclear rare earth complexes modulated by β-diketone co-ligands
Seven phenoxo–O and carbonyl–O bridged dinuclear rare earth complexes have been assembled utilizing 3-methoxysalicylaldehyde-2-aminobenzoylhydrazone (H 2 L) and three β-diketone ligands (Hdbm = 1,3-diphenyl-1,3-propanedione, Hacac = acetylacetone, Hbeac = 1-phenyl-1,3-butanedione): [RE 2 L(HL)(acac)...
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| Published in | New journal of chemistry Vol. 44; no. 10; pp. 3912 - 3921 |
|---|---|
| Main Authors | , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Cambridge
Royal Society of Chemistry
14.03.2020
|
| Subjects | |
| Online Access | Get full text |
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| Summary: | Seven phenoxo–O and carbonyl–O bridged dinuclear rare earth complexes have been assembled utilizing 3-methoxysalicylaldehyde-2-aminobenzoylhydrazone (H
2
L) and three β-diketone ligands (Hdbm = 1,3-diphenyl-1,3-propanedione, Hacac = acetylacetone, Hbeac = 1-phenyl-1,3-butanedione): [RE
2
L(HL)(acac)
3
]·3CH
3
CH
2
OH (RE(
iii
) = Eu (
1
), Tb (
2
), Dy (
3
), Ho (
4
), Er (
5
)), [Yb
2
L
2
(dbm)
2
(CH
3
OH)
2
]·CH
3
OH (
6
), [Dy
2
L(HL)(beac)
3
] (
7
). Complexes
5
and
6
show the characteristic emission peaks of the corresponding Er
3+
and Yb
3+
ions, respectively. Studies on the magnetic properties of the complexes reveal that complexes
3
and
7
exhibit slow magnetic relaxation behaviors, typical of SMM behaviors, resulting in an energy barrier of 140 K for
3
and 75 K for
7
. Meanwhile, this research demonstrates that the magnetic properties can be modulated by subtle changes in the coordination environment resulting from the changes in the co-ligand substituents. |
|---|---|
| ISSN: | 1144-0546 1369-9261 |
| DOI: | 10.1039/D0NJ00164C |