Intramolecular energy transfer mechanism between ligands in ternary rare earth complexes with aromatic carboxylic acids and 1,10-phenanthroline

Yan, Bing; Zhang, Hongjie; Wang, Shubin; Ni, Jian

doi:10.1016/s1010-6030(98)00307-4

Cited by 141 publications

(18 citation statements)

References 18 publications

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“…The energies of the singlet and triplet states of dpp, phen and DDXPO are significantly higher than those for the HPhN ligand (e.g. E S1 = 27,930 cm −1 , E T1 = 21,830 cm −1 for phen; [72] E S1 = 31,850 cm −1 , E T1 = 23,470 cm −1 for DDXPO, Fig. 3).…”

Section: Absorption Spectramentioning

confidence: 92%

Exceptional Oxygen Sensing Properties of New Blue Light‐Excitable Highly Luminescent Europium(III) and Gadolinium(III) Complexes

Borisov

Fischer

Saf

et al. 2014

Adv Funct Materials

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New europium(III) and gadolinium(III) complexes bearing 8-hydroxyphenalenone antenna combine efficient absorption in the blue part of the spectrum and strong emission in polymers at room temperature. The Eu(III) complexes show characteristic red luminescence whereas the Gd(III) dyes are strongly phosphorescent. The luminescence quantum yields are about 20% for the Eu(III) complexes and 50% for the Gd(III) dyes. In contrast to most state-of-the-art Eu(III) complexes the new dyes are quenched very efficiently by molecular oxygen. The luminescence decay times of the Gd(III) complexes exceed 1 ms which ensures exceptional sensitivity even in polymers of moderate oxygen permeability. These sensors are particularly suitable for trace oxygen sensing and may be good substitutes for Pd(II) porphyrins. The photophysical and sensing properties can be tuned by varying the nature of the fourth ligand. The narrow-band emission of the Eu(III) allows efficient elimination of the background light and autofluorescence and is also very attractive for use e.g. in multi-analyte sensors. The highly photostable indicators incorporated in nanoparticles are promising for imaging applications. Due to the straightforward preparation and low cost of starting materials the new dyes represent a promising alternative to the state-ofthe-art oxygen indicators particularly for such applications as e.g. food packaging.

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Section: Absorption Spectramentioning

confidence: 92%

Exceptional Oxygen Sensing Properties of New Blue Light‐Excitable Highly Luminescent Europium(III) and Gadolinium(III) Complexes

Borisov

Fischer

Saf

et al. 2014

Adv Funct Materials

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“…We can observe that (B) and (C) are rather similar in terms of the same organic ligand 2, 2¢-bipyridyl responsible for the emissions. The peak at 421 nm of (A) shows that the triplet state energy level of STA-APMMES is approximately 23753 cm )1 , which is higher than that of bipy (437 nm, 22880 cm )1 ), therefore, we suppose that energy transfer process will occur from STA-APMMES to 2,2¢-bipyridyl, substantiating that the heterocyclic ligand will become the main energy donor and have the possibility of sensitizing Ln 3+ ions (39,40). Figures 6 and 7 show the excitation and emission spectra of quaternary terbium molecular hybrids with OLA(STA)-AEAPMMS (APMES)-Si and 2, 2¢-bipyridyl.…”

Section: Assembly Of Luminescent Quaternary Molecular Hybridsmentioning

confidence: 77%

Molecular Assembly and Photophysical Properties of Quaternary Molecular Hybrid Materials with Chemical Bond

Yan

Qian

2007

Photochem & Photobiology

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In this paper, two long chain aliphatic carboxylic acids (oleic acid [OLA] and stearic acid [STA]) are modified with cross-linking molecules (N-2-aminoethyl-3-aminopropyl-methyl-dimethoxylsiliane, (AEAPMMS, H(2) N(CH(2))(2)HN(CH(2))(3)SiCH(3)(OCH(3))(2) and 3-aminopropyl-methyl-diethoxylsiliane (APMES, H(2) N(CH(2))(3)SiCH(3)(OC(2)H(5))(2)) resulting in four new kinds of structural molecular bridge OLA (STA)-AEAPMMS (APMES). Subsequently, ternary molecular complex systems with four molecular bridges OLA (STA)-AEAPMMS (APMES) and 2,2-bipyridyl (bipy) of lanthanides (terbium and europium) or zinc ions were assembled, which resulted in four novel kinds of quaternary molecular hybrid materials (named as bipy-Ln (Zn)-OLA (STA)-AEAPMMS (APMES) with strong chemical bonds (N-Ln(Zn)-O coordination bonds and Si-O covalent bonds) after a sol-gel (cohydrolysis and copolycondensation) process of the modified molecular bridges (as structural ligand) with inorganic precursor (tetraethoxysilane, TEOS). And especially bipy behaves as functional ligand to sensitize the luminescence of terbium or europium ions through the effective intramolecular energy transfer process, which gives rise to the characteristic emission of metal ions. The design and assembly from structural and functional ligands can help achieve a candidate technology for molecular hybrids.

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“…According to the energy transfer and intramolecular energy mechanism , the energy difference (Δ E ) between the triplet state energy level of the ligand and the lowest excited state energy level of the lanthanide ion is one of the most important factors influencing the luminescence properties of lanthanide complexes. If the energy difference is too large, the energy‐transfer rate constant will decrease due to diminution of the overlap between the energy donor (ligands) and acceptor (lanthanide ions).…”

Section: Resultsmentioning

confidence: 99%

Synthesis, characterization and luminescent properties of europium complexes with 2,4,6‐tris‐(2‐pyridyl)‐s‐triazine as highly efficient sensitizers

et al. 2015

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Using 2,4,6-tris-(2-pyridyl)-s-triazine (TPTZ) as a neutral ligand, and p-hydroxybenzoic acid, terephthalic acid and nitrate as anion ligands, five novel europium complexes have been synthesized. These complexes were characterized using elemental analysis, rare earth coordination titrations, UV/vis absorption spectroscopy and infrared spectroscopy. Luminescence spectra, luminescence lifetime and quantum efficiency were investigated and the mechanism discussed in depth. The results show that the complexes have excellent emission intensities, long emission lifetimes and high quantum efficiencies. The superior luminescent properties of the complexes may be because the triplet energy level of the ligands matches well with the lowest excitation state energy level of Eu(3+). Moreover, changing the ratio of the ligands and metal ions leads to different luminescent properties. Among the complexes, Eu2(TPTZ)2(C8H4O4)(NO3)4(C2H5OH)·H2O shows the strongest luminescence intensity, longest emission lifetime and highest quantum efficiency.

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Intramolecular energy transfer mechanism between ligands in ternary rare earth complexes with aromatic carboxylic acids and 1,10-phenanthroline

Cited by 141 publications

References 18 publications

Exceptional Oxygen Sensing Properties of New Blue Light‐Excitable Highly Luminescent Europium(III) and Gadolinium(III) Complexes

Exceptional Oxygen Sensing Properties of New Blue Light‐Excitable Highly Luminescent Europium(III) and Gadolinium(III) Complexes

Molecular Assembly and Photophysical Properties of Quaternary Molecular Hybrid Materials with Chemical Bond

Synthesis, characterization and luminescent properties of europium complexes with 2,4,6‐tris‐(2‐pyridyl)‐s‐triazine as highly efficient sensitizers

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