Tuning the sensitivity of Ln3+-based luminescent molecular thermometers through ligand design

Brites, Carlos D. S.; Lima, Patrícia P.; Carlos, Luı́s D.

doi:10.1016/j.jlumin.2015.01.025

Cited by 40 publications

(19 citation statements)

References 40 publications

(64 reference statements)

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“… 14 Less extensive investigations, at variance, have been devoted to the temperature dependence of luminescent properties of discrete lanthanide β-diketonato complexes, 19 − 26 though these compounds, being easily processable, are suitable for the development of functional materials for temperature measurements. 27 − 29 Europium complexes with a β-diketonato triplet energy of around 20.000–25.000 cm –1 , 30 − 33 are suitable for temperature sensing between 223 and 373 K, an interval that covers the physiological window (298–323 K) and the working range of many integrated circuits. 21 , 26 , 34 The temperature-dependent luminescent properties of these complexes can be easily modulated by changing the lateral substituents on the β-diketonato ligand, as showed in a pioneering work by Sato and Wada.…”

Section: Introductionmentioning

confidence: 99%

Composition–Thermometric Properties Correlations in Homodinuclear Eu³⁺ Luminescent Complexes

et al. 2020

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A family of homodinuclear Ln 3+ (Ln 3+ = Gd 3+ , Eu 3+ ) luminescent complexes with the general formula [Ln 2 (β-diketonato) 6 ( N -oxide) y ] has been developed to study the effect of the β-diketonato and N -oxide ligands on their thermometric properties. The investigated complexes are [Ln 2 (tta) 6 (pyrzMO) 2 ] (Ln = Eu ( 1 ·C 7 H 8 ), Gd ( 5 )), [Ln 2 (dbm) 6 (pyrzMO) 2 ] (Ln = Eu ( 2 ), Gd ( 6 )), [Ln 2 (bta) 6 (pyrzMO) 2 ] (Ln = Eu ( 3 ), Gd ( 7 )), [Ln 2 (hfac) 6 (pyrzMO) 3 ] (Ln = Eu ( 4 ), Gd ( 8 )) (pyrzMO = pyrazine N -oxide, Htta = thenoyltrifluoroacetone, Hdbm = dibenzoylmethane, Hbta = benzoyltrifluoroacetone, Hhfac = hexafluoroacetylacetone, C 7 H 8 = toluene), and their 4,4′-bipyridine N -oxide (bipyMO) analogues. Europium complexes emit a bright red light under UV radiation at room temperature, whose intensity displays a strong temperature ( T ) dependence between 223 and 373 K. This remarkable variation is exploited to develop a series of luminescent thermometers by using the integrated intensity of the 5 D 0 → 7 F 2 europium transition as the thermometric parameter (Δ). The effect of different β-diketonato and N -oxide ligands is investigated with particular regard to the shape of thermometer calibration (Δ vs T ) and relative thermal sensitivity curves: i.e.. the change in Δ per degree of temperature variation usually indicated as S r (% K –1 ). The thermometric properties are determined by the presence of two nonradiative deactivation channels, back energy transfer (BEnT) from Eu 3+ to the ligand triplet levels and ligand to metal charge transfer (LMCT). In the complexes bearing tta and dbm ligands, whose triplet energy is ca. 20000 cm –1 , both deactivation channels are active in the same temperature range, and both contribute to determine the thermometric properties. Conversely, with bta and hfac ligands the response of the europium luminescence to temperature variation is ruled by LMCT channels since the high triplet energy (>2...

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Section: Introductionmentioning

confidence: 99%

Composition–Thermometric Properties Correlations in Homodinuclear Eu³⁺ Luminescent Complexes

et al. 2020

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“…Hence the usage of such molecular thermometers is surging considerably in recent years. [7,8] The idea of using fluorescent molecules for logic gates application was dawned in the early 90s. Since then there is a lot of development in the field.…”

Section: Introductionmentioning

confidence: 99%

Photophysical Investigation of a Benzimidazole Derivative and Its Applications in Selective Detection of Fe3+, Thermosensing and Logic Gates

Nadgir

Sidarai

2021

J Fluoresc

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“…Many antenna molecules are reported in the literature such as : β‐diketones, Schiff bases, pyridine carboxylic acids etc. Out of these molecules, the widely studied antenna molecules for optical properties with Eu 3+ are β‐diketones like 1‐(2‐thenoyl) 3,3,3‐trifluoroacetone (HTTA), Dibenzoylmethane (HDBM) and 4,4,4‐Trifluoro‐1‐phenyl‐1,3‐butanedione (HBTFA) etc. These antenna molecules efficiently transfer energy to the lanthanide centers, in particular to Eu 3+ .…”

Section: Introductionmentioning

confidence: 99%

Ligand‐Field Asymmetry‐Controlled Luminescent Europium (III) and Samarium(III) Tris(β‐diketonate) Complexes of Diphenyl‐(2‐pyridyl‐N‐oxide)‐ Phosphine Oxide

Vats

Kannan²,

Kumar³

et al. 2017

ChemistrySelect

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Eight new complexes of the type Ln(OO)3.2 L1, Ln(OO)3.L2 (where Ln=Eu, Sm; OO=thenoyl trifluroacetonate(TTA) and dibenzoylmethanate(DBM); L1=diphenyl, (2‐pyridyl) phosphine oxide (PON) and diphenyl‐(2‐pyridyl‐N‐oxide)phosphine oxide (PONO)) were synthesized for the first time. Complexes were characterized by FTIR, CHN analyses and Single crystal X‐ray diffraction techniques. Structures of samarium complexes show that the L1 behaves as a monodentate ligand and bonds through P=O group to metal centre, whereas L2 behaves as a bidentate ligand and bonds through P=O as well as N−O groups to metal centre. Photophysical properties of all the complexes were measured in solid as well as solution states. Due to increase in ligand field asymmetry around the metal centre (by changing ligand from L1 to L2), the asymmetry ratio REu in Europium(III) tris( diketonate)‐L2 complexes were increased. This leads to increase in intrinsic quantum yield complexes with ligand L2 as compared to that of complexes of ligand L1.

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Tuning the sensitivity of Ln3+-based luminescent molecular thermometers through ligand design

Cited by 40 publications

References 40 publications

Composition–Thermometric Properties Correlations in Homodinuclear Eu³⁺ Luminescent Complexes

Composition–Thermometric Properties Correlations in Homodinuclear Eu³⁺ Luminescent Complexes

Photophysical Investigation of a Benzimidazole Derivative and Its Applications in Selective Detection of Fe3+, Thermosensing and Logic Gates

Ligand‐Field Asymmetry‐Controlled Luminescent Europium (III) and Samarium(III) Tris(β‐diketonate) Complexes of Diphenyl‐(2‐pyridyl‐N‐oxide)‐ Phosphine Oxide

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Tuning the sensitivity of Ln3+-based luminescent molecular thermometers through ligand design

Cited by 40 publications

References 40 publications

Composition–Thermometric Properties Correlations in Homodinuclear Eu3+ Luminescent Complexes

Composition–Thermometric Properties Correlations in Homodinuclear Eu3+ Luminescent Complexes

Photophysical Investigation of a Benzimidazole Derivative and Its Applications in Selective Detection of Fe3+, Thermosensing and Logic Gates

Ligand‐Field Asymmetry‐Controlled Luminescent Europium (III) and Samarium(III) Tris(β‐diketonate) Complexes of Diphenyl‐(2‐pyridyl‐N‐oxide)‐ Phosphine Oxide

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Composition–Thermometric Properties Correlations in Homodinuclear Eu³⁺ Luminescent Complexes

Composition–Thermometric Properties Correlations in Homodinuclear Eu³⁺ Luminescent Complexes