Strongly photoluminescent Eu(III) tetrazolate ternary complexes with phosphine oxides as powerful sensitizers

Mal, Suraj; Pietraszkiewicz, Marek; Pietraszkiewicz, Oksana

doi:10.1080/00958972.2014.987765

Cited by 14 publications

(15 citation statements)

References 29 publications

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“…1) similar to those reported previously (18)(19)(20). 1) similar to those reported previously (18)(19)(20).…”

Section: Synthesis Of the Ln(iii) Complexessupporting

confidence: 91%

“…The methodology described by Williams et al (24) and Eaton (25) was used to measure and calculate the PL quantum yields of lanthanide complexes in solution using well-characterized standard samples with known Φ ST values. The following equations were used to calculate PL quantum yield and PL decay time (20). Φ X (PL quantum yield sample) can be calculated using equation (1) as shown below:…”

Section: Pl Quantum Yield Determinationmentioning

confidence: 99%

“…The singlet and triplet values of HPTO were measured and calculated using Gd(PTO) 3 (complex 2), as described previously (18)(19)(20) (Figs S3 and S4). mechanism (Fig.…”

Section: Uv Absorbance and Pl Studiesmentioning

confidence: 99%

“…Acidic analogues of carboxylic acid, so-called 'tetrazoles', have not been used much in sensitization processes; to date, only a few articles have been published related to the PL of tetrazolates compared with that of lanthanide ions (15)(16)(17)(18)(19)(20)(21)(22). Acidic analogues of carboxylic acid, so-called 'tetrazoles', have not been used much in sensitization processes; to date, only a few articles have been published related to the PL of tetrazolates compared with that of lanthanide ions (15)(16)(17)(18)(19)(20)(21)(22).…”

Section: Introductionmentioning

confidence: 99%

“…In our most recent article, we synthesized ternary Eu(pyridine oxide trazolate) 3 complexes with three phosphine oxides; tri-n-octylphosphine oxide (TOPO), triphenylphosphine oxide (TPPO) and (bis(2-(diphenylphosphino)phenyl)ether oxide (DPEPO), and reported a PL quantum yield of 38% for DPEPOcoordinated ternary (pyridine tetrazolate) 3 Eu(III) complex in the solution phase at room temperature (20). In our most recent article, we synthesized ternary Eu(pyridine oxide trazolate) 3 complexes with three phosphine oxides; tri-n-octylphosphine oxide (TOPO), triphenylphosphine oxide (TPPO) and (bis(2-(diphenylphosphino)phenyl)ether oxide (DPEPO), and reported a PL quantum yield of 38% for DPEPOcoordinated ternary (pyridine tetrazolate) 3 Eu(III) complex in the solution phase at room temperature (20).…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and photophysical studies of tetrazolate‐based Eu(III) photoluminescent ternary complexes containing N‐heterocyclic phosphine oxides auxiliary co‐ligands

Mal

Pietraszkiewicz

2015

Luminescence

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Two new ternary tetrazolate Eu(III) complexes with phosphine oxide co-ligands Eu(PTO)3 ·(P1/P2) [PTO = 5-(2-pyridyl-1-oxide)tetrazole, P1 = diphenylphosphorylamino-phenylphosphoryl-benzene, P2 = diphenylphosphorylpyridine)-bis-isobutyricphosphoryl] were synthesized and characterized using UV, fluorescence, IR and (1) H NMR spectroscopic techniques. The analytical data prove that the complexes are mononuclear in nature and the central Eu(III) ion is coordinated by three N and three O atoms of tetrazolate, and two O atoms of the corresponding bidentate phosphine oxide ligands. The ancillary ligand increased the photoluminescence efficiency of Eu(PTO)3 ·P1 (complex 3) by twofold compared with our previously reported Eu(PTO)3 complex (complex 1). Copyright © 2015 John Wiley & Sons, Ltd.

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“…1) similar to those reported previously (18)(19)(20). 1) similar to those reported previously (18)(19)(20).…”

Section: Synthesis Of the Ln(iii) Complexessupporting

confidence: 91%

Section: Pl Quantum Yield Determinationmentioning

confidence: 99%

“…The singlet and triplet values of HPTO were measured and calculated using Gd(PTO) 3 (complex 2), as described previously (18)(19)(20) (Figs S3 and S4). mechanism (Fig.…”

Section: Uv Absorbance and Pl Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis and photophysical studies of tetrazolate‐based Eu(III) photoluminescent ternary complexes containing N‐heterocyclic phosphine oxides auxiliary co‐ligands

Mal

Pietraszkiewicz

2015

Luminescence

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Luminescent studies of binuclear ternary europium(III) pyridineoxide tetrazolate complexes containing bis‐phosphine oxide as auxiliary co‐ligands

Mal

Pietraszkiewicz

2017

Luminescence

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A new class of antenna chromophores so called 'tetrazolates' have not been explored much for lanthanide luminescencent complexes. However, we have already published several articles considering pyridineoxide tetrazolates as sensitizer with lanthanide ions. Although this class of antenna attracted much less attention because of its poor photoluminescence quantum yields (tris-pyridineoxide tetrazolate europium complex = 13% in solution) we tried and successfully achieved to improve the photoluminescence quantum yields for this particular antenna molecule by replacing coordinated water from the inner coordination sphere of europium ion by introducing phosphine oxides as additional chromophore. In the present article the two bis-phosphine oxides attach two molecules of tris-pyridineoxide tetrazolate europium(III) complex which leads to the improvement of the overall molar absorption coefficients as well as photo-physical properties of the complexes. We found more than two-fold increase (31% in solution) in photoluminescence quantum yield with one of the coordinated phosphine oxides comparing with that of tris-pyridineoxide tetrazolate europium(III) complex.

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Lanthanide Tetrazolate Complexes Combining Single‐Molecule Magnet and Luminescence Properties: The Effect of the Replacement of Tetrazolate N₃ by β‐Diketonate Ligands on the Anisotropy Energy Barrier

Jiménez

Diaz‐Ortega

Ruiz

et al. 2016

Chemistry A European J

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Three new sets of mononuclear Ln(III) complexes of general formulas [LnL3 ]⋅CH3 OH [Ln(III) =Yb (1), Er (2), Dy (3), Gd (4), and Eu (5)], [LnL2 (tmh)(CH3 OH)]⋅n H2 O⋅m CH3 OH [Ln(III) =Yb (1 b), Er (2 b), Dy (3 b), Gd (4 b)], and [LnL2 (tta)(CH3 OH)]⋅CH3 OH [Ln(III) =Yb (1 c), Er (2 c), Dy (3 c), Gd (4 c)] were prepared by the reaction of Ln(CF3 SO3 )⋅n H2 O salts with the tridentate ligand 2-(tetrazol-5-yl)-1,10-phenanthroline (HL) and, for the last two sets, additionally with the β-diketonate ligands 2,2,6,6-tetramethylheptanoate (tmh) and 2-thenoyltrifluoroacetonate (tta), respectively. In the [LnL3 ]⋅CH3 OH complexes the Ln(III) ions are coordinated to three phenanthroline tetrazolate ligands with an LnN9 coordination sphere. Dynamic ac magnetic measurements on 1-3 reveal that these complexes only exhibit single-molecule magnet (SMM) behavior when an external dc magnetic field is applied, with Ueff values of 11.7 K (1), 16.0 K (2), and 20.2 K (3). When the tridentate phenanthroline tetrazolate ligand is replaced by one molecule of methanol and the β-diketonate ligand tmh (1 b-3 b) or tta (1 c-3 c), a significant increase in Ueff occurs and, in the case of the Dy(III) complexes 3 b and 3 c, out-of-phase χ'' signals below 15 and 10 K, respectively, are observed in zero dc magnetic field. CASSCF+RASSI ab initio calculations performed on the Dy(III) complexes support the experimental results. Thus, for 3 the ground Kramers' doublet is far from being axial and the first excited state is found to be very close in energy to the ground state, so the relaxation barrier in this case is almost negligible. Conversely, for 3 b and 3 c, the ground Kramers' doublet is axial with a small quantum tunneling of the magnetization, and the energy difference between the ground and first Kramers' doublets is much higher, which allows these compounds to behave as SMMs at zero field. Moreover, these calculations support the larger Ueff observed for 3 b compared to 3 c. Additionally, the solid-state photophysical properties of 1, 2, 4, and 5 show that the phenanthroline tetrazolate ligand can act as an effective antenna to sensitize the characteristic Yb(III) , Er(III) , and Eu(III) emissions through an energy-transfer process.

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Strongly photoluminescent Eu(III) tetrazolate ternary complexes with phosphine oxides as powerful sensitizers

Cited by 14 publications

References 29 publications

Synthesis and photophysical studies of tetrazolate‐based Eu(III) photoluminescent ternary complexes containing N‐heterocyclic phosphine oxides auxiliary co‐ligands

Synthesis and photophysical studies of tetrazolate‐based Eu(III) photoluminescent ternary complexes containing N‐heterocyclic phosphine oxides auxiliary co‐ligands

Luminescent studies of binuclear ternary europium(III) pyridineoxide tetrazolate complexes containing bis‐phosphine oxide as auxiliary co‐ligands

Lanthanide Tetrazolate Complexes Combining Single‐Molecule Magnet and Luminescence Properties: The Effect of the Replacement of Tetrazolate N₃ by β‐Diketonate Ligands on the Anisotropy Energy Barrier

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Strongly photoluminescent Eu(III) tetrazolate ternary complexes with phosphine oxides as powerful sensitizers

Cited by 14 publications

References 29 publications

Synthesis and photophysical studies of tetrazolate‐based Eu(III) photoluminescent ternary complexes containing N‐heterocyclic phosphine oxides auxiliary co‐ligands

Synthesis and photophysical studies of tetrazolate‐based Eu(III) photoluminescent ternary complexes containing N‐heterocyclic phosphine oxides auxiliary co‐ligands

Luminescent studies of binuclear ternary europium(III) pyridineoxide tetrazolate complexes containing bis‐phosphine oxide as auxiliary co‐ligands

Lanthanide Tetrazolate Complexes Combining Single‐Molecule Magnet and Luminescence Properties: The Effect of the Replacement of Tetrazolate N3 by β‐Diketonate Ligands on the Anisotropy Energy Barrier

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Lanthanide Tetrazolate Complexes Combining Single‐Molecule Magnet and Luminescence Properties: The Effect of the Replacement of Tetrazolate N₃ by β‐Diketonate Ligands on the Anisotropy Energy Barrier