Visible and near-infrared light emitting calix[4]arene-based ternary lanthanide complexes

Hebbink, Gerald A.; Klink, Stephen I.; Alink, Patrick G. B. Oude; Veggel, Frank C. J. M. van

doi:10.1016/s0020-1693(01)00344-9

Cited by 32 publications

(14 citation statements)

References 25 publications

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“…Luminescent spectrum of the title compound upon excitation at 356 nm indicates three emission bands at 898, 1059 and 1338 nm, respectively (Fig. 5), which correspond to the 4 F 3/2 → 4 I 9/2 , 4 I 11/2 , and 4 I 13/2 transitions, respectively [29]. The luminescent lifetime of the title compound is about 0.9 s, which is much longer than those of neodymium(III) complexes with organic ligands [29].…”

Section: Resultsmentioning

confidence: 99%

“…5), which correspond to the 4 F 3/2 → 4 I 9/2 , 4 I 11/2 , and 4 I 13/2 transitions, respectively [29]. The luminescent lifetime of the title compound is about 0.9 s, which is much longer than those of neodymium(III) complexes with organic ligands [29]. The low value of the life times of the lanthanide complexes with organic ligands compared with the ions in inorganic matrices is due to the quenching of the luminescent state by high-frequency vibrations in the ligand and the solvent.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and crystal structure of a new neodymium(III) selenate-selenite: Nd2(SeO4)(SeO3)2(H2O)2

Feng

Mao

2005

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Synthesis and crystal structure of a new neodymium(III) selenate-selenite: Nd2(SeO4)(SeO3)2(H2O)2

Feng

Mao

2005

Journal of Alloys and Compounds

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“…Even though the donor emission energy level is higher, to some extent, than the acceptor absorption energy level, the small energy gap of less than 1600 cm À1 between them could allow the back energy transfer to be significantly possible. [24] Thus, it is possible that the back energy transfer takes place in NAC-2 with an energy difference of 1227 cm À1 between the donor emission energy level and the acceptor absorption energy level. Still, an efficient energy transfer may occur due to the relatively small energy difference.…”

Section: Energy Transfer Efficiency Of Nac-1 and Nac-2mentioning

confidence: 99%

Sensitized Emission of Luminescent Lanthanide Complexes Based on 4‐Naphthalen‐1‐yl‐Benzoic Acid Derivatives by a Charge‐Transfer Process

2006

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The photophysical properties of 4-naphthalen-1-yl-benzoic acid ligands and their Eu(III)-cored complexes were systematically investigated to elucidate the effective energy-transfer pathway in luminescent lanthanide complexes. A series of 4-naphthalen-1-yl-benzoic acid ligands, such as 4-naphthalen-1-yl-benzoic acid (NA-1), 4-[4-(4-methoxyphenyl)-naphthalen-1-yl]-benzoic acid (NA-2), and 4-{4-[4-(4-methoxyphenyl)-naphthalen-1-yl]-benzyloxy}-benzoic acid (NA-3), were synthesized and utilized for the synthesis of their Eu(III)-cored complexes, corresponding to NAC-1, NAC-2, and NAC-3. The fluorescence spectra of NA-1 and NA-2 show large Stokes shifts with increasing solvent polarity. These large Stokes shifts might be dominantly due to the formation of an intramolecular charge transfer (ICT) complex in the excited state. Also, the intensive luminescence of the Eu(III) ions by the photoexcitation of the ligand in NAC-1 and NAC-2 in polar solvents supports that the energy transfer from the ligand to the Eu(III) ion takes place efficiently. In the case of NA-3, which has a -CH2OPh- group that acts as a blocking group, there is no dependence of the fluorescence spectrum on the solvent nature and no luminescence of the Eu(III) ions by the photoexcitation of the ligand, indicating no formation of the ICT state. This can be due to the fact that the formation of the ICT state in NA-3 was prevented because the -OCH2- group acts as a blocking group by interrupting the pi-conjugation between the benzoic acid and the naphthalene unit. From these photophysical studies, we suggest that the ICT state plays a very important role in the energy-transfer pathway from the ligand to the Eu(III) ion. To our best knowledge, this is the first demonstration of sensitized emission of luminescent lanthanide complexes based on 4-naphthalen-1-yl-benzoic acid derivatives by the charge-transfer process.

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“…The k nr values of [Eu(hfa) 3 -(BTFO4)-O] and [Eu(hfa) 3 (BTFO4)-C] are almost the same, which can be affected by energy back transfer to the sensitizer and quenching by ligand vibrations. 99,100 Therefore, these processes appear to not play a major role in emission intensity changes upon the photochromic reaction. Notably, the k r value of [Eu(hfa) 3 (BTFO4)-O] is 1.5 times larger than that of [Eu(hfa) 3 (BTFO4)-C].…”

Section: Luminescent Lanthanoid Complex IVmentioning

confidence: 99%

Photofunctional Lanthanoid Complexes, Coordination Polymers, and Nanocrystals for Future Photonic Applications

Hasegawa

2014

Bulletin of the Chemical Society of Japan

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In this account, lanthanoid complexes, coordination polymers, and nanocrystals with photofunctional properties are introduced. To maintain the effective emission of Nd(III), Sm(III), Eu(III), Tb(III), and Yb(III) ions in organic media, the coordination sphere of the lanthanoid ions should consist of strong, bulky, and asymmetric ligands with low vibrational frequencies, that is, there are three criteria for luminescence: 1) suppression of vibrational relaxation, 2) prevention of nonradiative cross relaxation at diffusional collision, and 3) introduction of asymmetric coordination geometry for enhancing electric dipole transition. Lanthanoid coordination compounds with characteristic photosensitizing properties, photochromic properties, circularly polarized luminescence (CPL), metal ion sensing properties, solvent sensing properties, energy-conversion properties, thermostable properties, triboluminescent properties, and thermosensing properties are also described for the development of photofunctional materials. In the second half, the synthesis, photophysical magnetic, and magneto-optical properties of lanthanoid nanocrystals, EuO, EuS, and EuSe, are reported. In particular, the remarkable photophysical properties of nanoaggregates composed of EuS nanocrystals are presented. Photofunctional lanthanoid(III) complexes, coordination polymers, and nanocrystals are expected to open up a frontier field of materials science.

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Visible and near-infrared light emitting calix[4]arene-based ternary lanthanide complexes

Cited by 32 publications

References 25 publications

Synthesis and crystal structure of a new neodymium(III) selenate-selenite: Nd2(SeO4)(SeO3)2(H2O)2

Synthesis and crystal structure of a new neodymium(III) selenate-selenite: Nd2(SeO4)(SeO3)2(H2O)2

Sensitized Emission of Luminescent Lanthanide Complexes Based on 4‐Naphthalen‐1‐yl‐Benzoic Acid Derivatives by a Charge‐Transfer Process

Photofunctional Lanthanoid Complexes, Coordination Polymers, and Nanocrystals for Future Photonic Applications

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