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3D LnIII-MOFs: slow magnetic relaxation and highly sensitive luminescence detection of Fe3+ and ketonesElectronic supplementary information (ESI) available. CCDC 1827828. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c8dt01034j
Five new 3D isostructural lanthanide metal organic frameworks (Ln-MOFs), [Ln(HL) 1.5 (H 2 O)(DMF)]·2H 2 O (Ln = Gd III ( 1 ), Sm III ( 2 ), Dy III ( 3 ), Eu III ( 4 ) and Tb III ( 5 ), H 3 L = 5-(3′,5′-dicarboxylphenyl) nicotinic acid) were synthesized by solvothermal methods and studied by structur...
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| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Online Access: | Get full text |
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| Summary: | Five new 3D isostructural lanthanide metal organic frameworks (Ln-MOFs), [Ln(HL)
1.5
(H
2
O)(DMF)]·2H
2
O (Ln = Gd
III
(
1
), Sm
III
(
2
), Dy
III
(
3
), Eu
III
(
4
) and Tb
III
(
5
), H
3
L = 5-(3′,5′-dicarboxylphenyl) nicotinic acid) were synthesized by solvothermal methods and studied by structural analyses, magnetic analyses and luminescence sensing. Crystallographic studies revealed that these compounds are 3D frameworks in which the Ln
III
-COO chains with alternating four and two carboxylate bridges are interlinked by the organic ligands L, and contain microporous channels with accessible Lewis-base sites, coordinated water molecules and uncoordinated carboxyl groups, which are easy to combine and recognise various analytes. Magnetic studies demonstrated that the carboxylate bridges transmit interchain dominant ferromagnetic interactions in Gd-MOF (
1
) and Dy-MOF (
3
), while the decrease of the
χT
value in Sm-MOF (
2
) is due to the thermal depopulation effect of the excited levels. Furthermore, Dy-MOF (
3
) also shows slow magnetic relaxation behaviour under a zero dc field. The luminescence selective sensing experiments showed that Eu-MOF (
4
) and Tb-MOF (
5
) can act as recyclable sensors towards Fe
3+
ions in water and the simulated biological fluids, and towards ketones in a water system with high sensitivity, selectivity and relatively low detection limits.
Five Ln-MOFs were obtained: the Dy-MOF shows slow magnetic relaxation, and the Eu-MOF and Tb-MOF show selective and sensitive sensing towards Fe
3+
ions and ketones in a water system. |
|---|---|
| ISSN: | 1477-9226 1477-9234 |
| DOI: | 10.1039/c8dt01034j |