A study of the fluorescence of some newly synthesized europium complexes with pyrazolone derivatives

Qian, Dong−Jin; Leng, Weinan; Zhang, Yuan; Chen, Zhong; Houten, Judith Van

doi:10.1016/s1386-1425(00)00306-1

Cited by 20 publications

(6 citation statements)

References 15 publications

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“…The observance of this 0−0 transition with only a single band is in line with the crystallographic structure analysis that shows a C 1 site symmetry for the single Eu(III) site in the compound. The breaking of the degeneracy of the 5 D 0 → 7 F 1 transition resulting in the observance of multiple Stark components is also consistent with a low site symmetry for Eu(III) (C 1 symmetry) [42]. The 5 D 0 → 7 F 2 transition shows splitting into five Stark components even at room temperature.…”

Section: D-h•••a D-h H•••a D•••a D-h•••asupporting

confidence: 73%

Synthesis, Structure, and Luminescence of a Molecular Europium Tetracyanoplatinate Incorporating 4,5-Diazafluoren-9-One

Sykora

2023

Crystals

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Eu2(Pt(CN)4)3(H2O)12]·4C11H6N2O·6H2O represents a new member to the lanthanide tetracyanoplatinate family of materials. The synthesis, single-crystal X-ray structure, and photoluminescence properties of this compound are reported herein. The compound contains dimeric [Eu2(Pt(CN)4)3(H2O)12] molecules in which the Eu3+ sites are connected with trans-bridging [Pt(CN)4] 2− anions and co-crystallized along with 4,5-diazafluoren-9-one (dafone) and lattice water. Prominent noncovalent interactions that stabilize the structure include H-bonding as well as short stacking interactions involving the planar tetracyanoplatinate anions in conjunction with the planar dafone molecules. Photoluminescence measurements illustrate that Eu2(Pt(CN)4)3(H2O)12]·4C11H6N2O·6H2O contains multiple emitting states and also displays enhanced Eu3+-based emission due to energy transfer within the compound.

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Section: D-h•••a D-h H•••a D•••a D-h•••asupporting

confidence: 73%

Synthesis, Structure, and Luminescence of a Molecular Europium Tetracyanoplatinate Incorporating 4,5-Diazafluoren-9-One

Sykora

2023

Crystals

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“…Also, the molar extinction coefficient is 5.73 × 10 -4 L mol -1 cm -1 . Since energy-transfer processes in lanthanoid complexes occur via the absorption of light by the ligand, followed by intramolecular energy transfer from the ligand to the central metal ion, 11 this strong absorption offers an efficient excitation mechanism for the Tb 3+ ion.…”

Section: Spectral Characteristicsmentioning

confidence: 99%

Determination of Trace Terbium(III) with N, N, N′-Tri(3-indolemethanal)triaminotriethylamine Based on a New Fluorescence Enhancement System

Yang

Tai²,

Liu³

et al. 2004

ANAL. SCI.

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Because they have long fluorescence lifetimes and their excited states have strong fluorescence emission, europium(III) and terbium(III) have extensive applications in biological medicine, especially in the fluorescence imagery cancer radiation treatment, 1 fluorescence mark, 2 and fluorescence analysis. 3 The bioactivity and magnetic performance of Schiff bases and their complexes with rare earth ions have been studied extensively. However, their fluorescence properties have rarely been studied due to their low luminescence. 4,5 So far, chemists have realized that it is essential to design appropriate ligands to optimize the luminescence properties of lanthanide ions by facilitating the well-known light conversion process, which that show to be efficient ligand-to-metal energy-transfer process (antenna effect). Recently, we designed a series of Schiff-base ligands having both selective abilities to coordinate lanthanide ions and enhancing their luminescence by providing proper conjugate absorption groups suitable for energy transfer, which could be used as a luminescent device. In the present work, we designed and synthesized a new and doubly functionalized Schiff-base ligand with a tripodal structure, (N,N′,N″-tri(3-indolemethanal)triaminotriethylamine (TTAIM)), and studied the fluorescence properties of the terbium(III) complex with the new ligand. We found that the Tb 3+ complex with TTAIM can emit intrinsic spectrum of Tb 3+ under excitation of ultraviolet light.Fluorescence enhancement in the field of analytical determination of rare earth elements has for a long time attracted much interest among scientists because of its lower detection limit and higher sensitivity. Phen, EDTA, TTA and TOPO etc., are currently being used as secondary ligands in fluorescence enhancement. 6-8 However, in our recent studies, it was found that NaAc could also strongly enhance the luminescence of Tb 3+ with TTAIM by about two orders of magnitude. Other reagents, such as HMTM, bipy, TBP, tris, sodium tartrate, TOPO, sodium citric acid, NH4Cl, NaH2PO4 and Na2HPO4, do not have the same effect as NaAc, and some of them even slow quenching of the fluorescence of Tb 3+. A further investigation found that dimethyl sulfoxide (DMSO) could enhance the fluorescence intensity of the Tb-TTAIMNaAc system by about 16 fold. Although hundreds of ligands have been used in the fluorescence enhancement field for the determination of lanthanide(III) ions, with some of them achieving low limits of detection, the enhancement effects of NaAc on Schiff bases ligands, up to now, has not been reported. Thus, the phenomenon is unusual. It can be exploited for the development of a new method for the determination of Tb 3+ . The advantages of the method over well-established current ones 9 are (a) high sensitivity and selectivity, (b) rapid reaction time (< 1 min at room temperature), (c) high stability ( 2 h), and (d) simple procedures. Then, the synthesized ligand TTAIM was used to investigate the phenomenon in detail. Experimental ApparatusCarbon, nitr...

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“…33,34 Furthermore, they are known to exhibit extensive solid-state photo-tautomerism. [35][36][37] These systems merge the capacity to coordinate metal ions with ESIPT features due to the cheto-enol tautomerization of the 5-hydroxypyrazole to the 5-pyrazolone moiety 38,39 (Scheme 1).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and study of three hydroxypyrazole-based ligands: A ratiometric fluorescent sensor for Zn(II)

Formica

Favi

Fusi

et al. 2018

Journal of Luminescence

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A study of the fluorescence of some newly synthesized europium complexes with pyrazolone derivatives

Cited by 20 publications

References 15 publications

Synthesis, Structure, and Luminescence of a Molecular Europium Tetracyanoplatinate Incorporating 4,5-Diazafluoren-9-One

Synthesis, Structure, and Luminescence of a Molecular Europium Tetracyanoplatinate Incorporating 4,5-Diazafluoren-9-One

Determination of Trace Terbium(III) with N, N, N′-Tri(3-indolemethanal)triaminotriethylamine Based on a New Fluorescence Enhancement System

Synthesis and study of three hydroxypyrazole-based ligands: A ratiometric fluorescent sensor for Zn(II)

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