authors |
Sen, R; Paul, S; Sarkar, A; Botas, AMP; Neto, ACN; Brandao, P; Lopes, AML; Ferreira, RAS; Araujo, JP; Lin, Z |
nationality |
International |
journal |
CRYSTENGCOMM |
keywords |
METAL-ORGANIC FRAMEWORKS; HYDROTHERMAL SYNTHESIS; TRANSITION-METAL; BUILDING-BLOCKS; SINGLE-CRYSTAL; CARBON-DIOXIDE; MAGNETIZATION; COMPLEXES; DESIGN; CHAIN |
abstract |
A new series of 3D lanthanide (Ln) frameworks has been synthesized with the general formula [{Ln(L)(H2O)}center dot H2O](n) (where Ln = La(1), Tb(2) and Dy(3); L = (HO)OC6H2(CH2COO)(2); H3L = 2,5-dihydroxy-1,4-benzenediacetic acid = DHBDA). All the crystals were analyzed by single crystal X-ray diffraction. The Ln ions are octa-coordinated having the square antiprism geometry with the D-4d symmetry and connected along the crystallographic a-axis forming a zigzag chain. These chains are further connected by the ligands in three-dimensional crystallographic space. Compounds 2 and 3 were subjected to variable temperature magnetic susceptibility measurements and photoluminescence studies. Magnetic studies reveal that compound 2 possesses antiferromagnetic coupling whereas compound 3 shows ferromagnetic interaction at temperatures above ca. 40 K. The emission spectra of compounds 2 and 3 combine the intra-4f emission of the Ln ions with that of the ligand, depending on the selected temperature, pointing out that the energy transfer processes are thermally activated. In addition, compound 2 presented an invariant D-5(4) lifetime behaviour at temperatures between 15 and 300 K. Theoretical analysis showed that the long-lived lifetimes of the free ligand's excited states and the intramolecular energy transfer rate invariability are responsible for such abnormal behaviour. |
publisher |
ROYAL SOC CHEMISTRY |
isbn |
1466-8033 |
year published |
2021 |
volume |
23 |
issue |
23 |
beginning page |
4143 |
ending page |
4151 |
digital object identifier (doi) |
10.1039/d1ce00228g |
web of science category |
9 |
subject category |
Chemistry, Multidisciplinary; Crystallography |
unique article identifier |
WOS:000653656600001
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ciceco authors
impact metrics
journal analysis (jcr 2019):
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journal impact factor |
3.117 |
5 year journal impact factor |
2.933 |
category normalized journal impact factor percentile |
66.737 |
dimensions (citation analysis):
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altmetrics (social interaction):
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