The paramagnetic metal effect on the ligand localized S1 .apprx. .fwdarw. T1 intersystem crossing in the rare-earth-metal complexes with methyl salicylate

Tobita, Seiji; Arakawa, Masayuki; Tanaka, Ikuzo

doi:10.1021/j100272a015

Cited by 173 publications

(120 citation statements)

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“…The energy levels of the Gd 3+ ion are well above those of the triplet level so that no gadolinium(III)-centered emission is observed. Moreover, the heavy paramagnetic Gd 3+ ion enhances the intersystem crossing from the singlet to the triplet state, because of mixing of the triplet and singlet states ("heavy atom effect" and "paramagnetic effect") [352][353][354][355][356]. The triplet state acquires partially a singlet character by the spin-orbit coupling interaction, and the selection rules are relaxed.…”

Section: Sensitized Luminescencementioning

confidence: 99%

Interpretation of europium(III) spectra

Binnemans

2015

Coordination Chemistry Reviews

2,455

108

1,912

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Section: Sensitized Luminescencementioning

confidence: 99%

Interpretation of europium(III) spectra

Binnemans

2015

Coordination Chemistry Reviews

2,455

108

1,912

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“…[23] Upon complexation of Tb Figure 3c), efficient L11!Ln III energy transfers occur, thus leading to the detection of the well-established metal-centered luminescence (Table 1 and Figure 3). The roughly temperature-independ- Table 1) is typical for Eu III that is nine-coordinated by the three heterocyclic nitrogen atoms of the 2,6-bis(benzimidazol-yl)pyridine unit and by three bidentate nitrate anions as previously…”

mentioning

confidence: 99%

Rational Tuning of Melting Entropies for Designing Luminescent Lanthanide‐Containing Thermotropic Liquid Crystals at Room Temperature

Escande

Guénée

Nozary

et al. 2007

Chemistry A European J

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The connection of twelve peripheral and divergent dodecyloxy chains to a central tridentate aromatic binding unit provides the dodecacatenar ligand L11, for which room-temperature mesomorphism is detected. An enthalpically unbalanced large melting entropy (DeltaSmL11=226 J mol(-1) K(-1)) results from the programmed microsegregation induced in the crystalline phase, a phenomenon which is maintained in the associated lanthanide complexes [Ln(L11)(NO3)3] and [Ln(L11)(CF3CO2)3]2. Low-temperature melting processes (-43

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“…Paramagnetic square-planar or tetragonally distorted metal ions such as Co 2+ , Cr 3+ , Cu 2+ , Fe 3+ , Ni 2+ , and Pd 2+ are able to quench the fluorescence of optical chemosensors which is presumptively undesirable for analytical purposes [38]. The paramagnetic effect is basically the result of an enhanced electronic states' mixing (considered as a formally forbidden intersystem crossing) of a ligand by means of the inhomogeneous magnetic field of the paramagnetic ion [39]. For this reason, classical probes for Cu 2+ and other strongly paramagnetic metal ions are usually based on the quenching of the fluorescence [40].…”

Section: Optical Sensing Propertiesmentioning

confidence: 99%

“…The absorbance increases immediately and stables within 110 min ( Figure 6). (considered as a formally forbidden intersystem crossing) of a ligand by means of the inhomogeneous magnetic field of the paramagnetic ion [39]. For this reason, classical probes for Cu 2+ and other strongly paramagnetic metal ions are usually based on the quenching of the fluorescence [40].…”

Section: Response Timementioning

confidence: 99%

Fluorescence Chemosensory Determination of Cu2+ Using a New Rhodamine–Morpholine Conjugate

et al. 2017

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Abstract:A new rhodamine-B carbonyl-morpholine derivative (denoted as RECM) was prepared by a two-step synthesis procedure. The employed method allowed a lactam ring development of rhodamine-B and ethylenediamine to demonstrate a facile amide bond formation. The obtained RECM was confirmed by 1 H NMR, 13 C NMR, and mass spectrometry analysis. RECM was formed to detect copper ion (Cu 2+ ) due to its problematic toxicity features in aquatic ecosystems. It showed a high selectivity toward Cu 2+ in comparison with some environmentally relevant alkali, alkaline earth, and transition metal cations at 50 µM in acetonitrile. Moreover, non-fluorescent RECM showed fluorescence intensity and UV-Vis absorbance increases in the presence of Cu 2+ with high linear dependent coefficients (R 2 = 0.964 and R 2 = 0.982 respectively) as well as a color change from colorless to pink owing to the ring opening of the rhodamine spirolactam form. Binding capability experiments presented a clear 1:1 stoichiometry of RECM-Cu 2+ complex with the binding constant (K a ) as 2.25 × 10 4 M −1 . The calculation of limits of detection (LOD) was 0.21 µM based on the linear regression method, which is below the maximum contaminant level goal (MCLG) value of Cu 2+ (1.3 ppm equals to 20.46 µM) in drinking water. These characteristics make the RECM a promising candidate for the real-time detection of toxic Cu 2+ in environmental monitoring applications.

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The paramagnetic metal effect on the ligand localized S1 .apprx. .fwdarw. T1 intersystem crossing in the rare-earth-metal complexes with methyl salicylate

Cited by 173 publications

References 0 publications

Interpretation of europium(III) spectra

Interpretation of europium(III) spectra

Rational Tuning of Melting Entropies for Designing Luminescent Lanthanide‐Containing Thermotropic Liquid Crystals at Room Temperature

Fluorescence Chemosensory Determination of Cu2+ Using a New Rhodamine–Morpholine Conjugate

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