Crystal structures and photoluminescent properties of highly disordering lanthanide-2,5-pyridinedicarboxylate frameworks

Yotnoi, Bunlawee; Sinchow, Malee; Ngamjarurojana, Athipong; Rujiwatra, Apinpus

doi:10.1016/j.ica.2019.119236

Cited by 2 publications

(1 citation statement)

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“…Hpoa with mostly monodentate and chelating coordination ability, on the other hand, should disrupt the dense framework formation, leading therefore to open frameworks. With respect to the sensitization process, , both 2,5-H 2 pydc and Hpoa are recognized as effective sensitizers and can effectively promote the desired f–f emissions. , The pyridine ring of 2,5-H 2 pydc and the O atom and phenyl ring of Hpoa, in addition, should be available to interact with ammonia through hydrogen bonding interactions and consequently induce viable alteration in the f–f emission profile of Ln III .…”

Section: Introductionmentioning

confidence: 99%

Photoluminescent Lanthanide Coordination Polymers for Ammonia Gas Detection at Ambient Temperature and Humidity

Thammakan

Sinchow

Chiangraeng

et al. 2023

Crystal Growth & Design

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Aiming at ammonia gas detection at ambient temperature, phenoxyacetic acid (Hpoa) and 2,5-pyridinedicarboxylic acid (H2pydc) were employed to construct the isostructural [LnIII(poa)(2,5-pydc)(H2O)2]·3H2O (LnIII = EuIII (I), GdIII (II), and TbIII (III)). Their single crystal structures and photophysical properties as well as the triplet state energies of the sensitizers were characterized. Robustness and responses of I and its composite film with poly(vinyl alcohol) (I/PVA) toward water, ammonia, and common volatile organic compounds were examined. The substantial quenching of EuIII:5D0 → 7F J by only ammonia was disclosed, and the underlying mechanism was postulated based on experimental and computational studies. Referring to EuIII:5D0 → 7F2, the response R parameter was defined. Under ambient temperature (25–35 °C) and humidity (45–55% RH), a linear dependence of R on ammonia concentration (0.50–10.0 ppm) was obtained from I/PVA. Based on the calibration method, the sensitivity (4.04%·ppm–1), detection limit (0.14 ppm), percentage recoveries (103–111% for 3.50, 6.50, and 8.50 ppm), and relative standard deviation (1.5–8.2%) were determined. The reuse of the film for at least 10 cycles was demonstrated with 95–97% repeatability. Limitation of the detection by extreme humidity was presented.

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