2012
DOI: 10.1039/c2dt30062a
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A comparison of sensitized Ln(iii) emission using pyridine- and pyrazine-2,6-dicarboxylates

Abstract: The synthesis, X-ray structure, solution stability, and photophysical properties of Eu(III) complexes with pyrazine-2,6-dicarboxylic acid (H 2 PYZ) are reported, and compared to structurally analogous complexes with pyridine-2,6-dicarboxylic acid (H 2 DPA). The [Eu(PYZ) 3 ] 3− complex demonstrates highly efficient metal-centered Eu(III) luminescence in the solid state (Φ total ∼ 60.9%). In aqueous solution, moderate stability is retained at pH 7.4 ( pEu ∼ 10.5), although hydrolysis of the complex anion becomes… Show more

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Cited by 16 publications
(15 citation statements)
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“…26 Interestingly, using our nanosecond laser setup which affords ca. 8 ns excitation pulses, we were also able to measure the rise time for population of the 5 (Fig. S5, ESI †).…”
Section: Solution Photophysicsmentioning
confidence: 99%
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“…26 Interestingly, using our nanosecond laser setup which affords ca. 8 ns excitation pulses, we were also able to measure the rise time for population of the 5 (Fig. S5, ESI †).…”
Section: Solution Photophysicsmentioning
confidence: 99%
“…Similarly, by monitoring the weak emission of the 5 D 1 → 7 F 1 transition at 538 nm, we could measure the corresponding decay of the 5 D 1 excited state, which gave the same value. Hence, for both complexes, the sensitization process for the Eu(III) cation involves (at least to some extent) internal conversion from the intermediate 5 We have quantifed the intensity of the Ln(III) emission via luminescence quantum yield measurements with the resulting data summarized in Table 2 (see also Fig. S6, ESI †).…”
Section: Solution Photophysicsmentioning
confidence: 99%
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“…However, most challenges from synthesis process are the recognized bottleneck of In(III) salt hydrolysis [3]. As an important multidentate O and N-donor ligand, 2,6-H 2 pydc (2,6-pyridine dicarboxylic acid), with a rigid 120°angle between the central pyridine ring and the two carboxylate groups, is a versatile ligand, and could provide various coordination modes [4]. H 4 bptc (3,3 ,4,4 -benzophenonetetracarboxylate), a flexible tetracarboxylic ligand is also worth to be introduced based on the following considerations: First, there are multiple bridging carboxylic groups, which may provide a variety of connection modes with metal centers [5].…”
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confidence: 99%