Structural effect on NIR luminescence of three salen type heteropolynuclear 3d − 4f erbium complexes

Zou, Xiaoyan; Fei, Bowen; Li, Guangming

doi:10.1016/j.poly.2020.114811

Cited by 6 publications

(5 citation statements)

References 30 publications

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“…As shown in Figure (left), the emission spectrum of [(hfac) 3 Er(μ-tppz)Er(hfac) 3 ]·CH 2 Cl 2 ( 6 -Er) displays a splitting band at 1532 nm which corresponds to the 4 I 13/2 → 4 I 15/2 transition upon excitation at 430 nm at 295 K . This shows that the synergistic effect of hfac and tppz can sensitize the NIR luminescence of the Er(III) ion.…”

Section: Resultsmentioning

confidence: 86%

“…As shown in Figure 7 (left), the emission spectrum of [(hfac) 3 Er(μ-tppz)Er(hfac) 3 ]•CH 2 Cl 2 (6-Er) displays a splitting band at 1532 nm which corresponds to the 4 I 13/2 → 4 I 15/2 transition upon excitation at 430 nm at 295 K. 69 This shows that the synergistic effect of hfac and tppz can sensitize the NIR luminescence of the Er(III) ion. The mixed triplet energy level [E( 3 ππ*)] originated from the synergistic effect of hfac and tppz is 18,182 cm −1 , which is 3263 cm −1 higher than the excited state energy level of Er(III) ( 4 D 5/2 , ∼ 14,919 cm −1 ).…”

Section: Ir Spectroscopymentioning

confidence: 95%

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Syntheses, Crystal Structures, and Luminescence of Hexafluoroacetylacetone Dinuclear Lanthanide Complexes Bridged by “Back-to-Back” Bisterpyridine

Li,

Liu,

et al. 2024

Crystal Growth & Design

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Six dinuclear lanthanide complexes [(hfac) 3 Ln(μtppz)Ln(hfac) 3 ] [Ln(III) = 1-Eu, 2-Gd, 3-Tb, hfac = 1,1,1,5,5,5hexafluoroacetylacetone, tppz = 2,3,5,6-tetra(pyridin-2-yl)pyrazine], [(hfac) 3 Ln(μ-tppz)Ln(hfac) 3 ]•CH 2 Cl 2 [Ln(III) = 4-Dy, 5-Yb, 6-Er], and seven dinuclear lanthanide complexes Sm,, were synthesized and characterized by elemental analyses, infrared spectroscopy, thermogravimetric analyses, singlecrystal X-ray diffraction, and powder X-ray diffraction. Solid-state luminescence investigations suggest that an efficient energy transfer process is taking place in 1-Eu and 9-Eu. The dominant intersystem crossing (ISC) and the ligand-to-metal energy transfer (ET) processes in the dinuclear Eu(III) complex bridged by tppz are more efficient, making 1-Eu possess longer τ and higher quantum yield (QY) (0.687 ms and 53.47%) than 9-Eu (0.670 ms and 14.22%). Additionally, the mononuclear complex [Eu(NO 3 ) 3 (ptpy)(H 2 O)] shows longer τ and higher QY (0.545 ms and 16.80%) than the dinuclear complex [Eu(NO 3 ) 3 (H 2 O)] 2 (μ-tppz) (0.035 ms and 1.31%) and [Eu(hfac) 3 (ptpy)] has longer τ and higher QY (0.819 ms and 59.95%) than 9-Eu. The results imply that increasing the length of the "back-to-back" bisterpyridine ligands or the number of the Eu(III) centers could make the luminescence performances such as τ and QY decrease. There is an inefficient energy transfer existing in the Tb(III) and Dy(III) complexes because of the back energy transfer (BET) processes, which leads to an unfavorable condition in observing significantly the characteristic Tb(III)-and Dy(III)-based emissions. However, the synergistic effect of hfac and tppz (or hfac and 1,4-bteb) could sensitize the visible and near-infrared (NIR) luminescence of Sm(III) ion and the NIR luminescence of Nd(III), Er(III), and Yb(III) ions. The τ value and the calculated intrinsic quantum yield (ϕ Ln ) of 7-Nd are 1.13 μs and 0.13%, respectively. This work unveils the synergistic sensitization effect of primary hfac ligands and the ancillary tppz and 1,4bteb ligands and the influences of the length of the bridging bisterpyridine ligands and the numbers of the Ln(III) centers on the luminescence properties. It is anticipated that the synthesized dual-sensitized ternary lanthanide complexes might be excellent candidates for some optoelectronic applications.

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Section: Resultsmentioning

confidence: 86%

Section: Ir Spectroscopymentioning

confidence: 95%

Syntheses, Crystal Structures, and Luminescence of Hexafluoroacetylacetone Dinuclear Lanthanide Complexes Bridged by “Back-to-Back” Bisterpyridine

Li,

Liu,

et al. 2024

Crystal Growth & Design

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“…These emission data demonstrate that the organic ligands can effectively transfer energy to the lanthanide ions in 3 and 5 , but such an intramolecular energy‐transfer process is ineffective in 6 [36] . Furthermore, under excitation at 331 nm, the emission decay for 3 , 5 and 6 was measured through monitoring the most intense transition of the lanthanide ion, and the decay plots were fitted by a bi‐exponential function (Figure S10–S12) [37] . The lifetime values ( τ 1 and τ 2 ) are 798 and 1421 ( 3 ), 190 and 572 ( 5 ), 11 and 453 ( 6 ) μs, respectively.…”

Section: Resultsmentioning

confidence: 87%

“…[36] Furthermore, under excitation at 331 nm, the emission decay for 3, 5 and 6 was measured through monitoring the most intense transition of the lanthanide ion, and the decay plots were fitted by a biexponential function (Figure S10-S12). [37] The lifetime values (τ 1 and τ 2 ) are 798 and 1421 (3), 190 and 572 (5), 11 and 453 (6) μs, respectively.…”

Section: Photoluminescent Propertiesmentioning

confidence: 97%

Synthesis, structure, photoluminescence and magnetism of a series of cobalt‐lanthanide heterometallic complexes originated from 2,3‐dichlorobenzoate and 1,10‐phenanthroline

Shen,

Qu,

Chen

et al. 2023

Zeitschrift anorg allge chemie

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A series of 3d–4f heterometallic complexes, namely [Ln2Co2(2,3‐DCB)10(phen)2] [Ln=Nd (1), Sm (2), Eu (3), Gd (4), Tb (5), Dy (6), Er (7)], were obtained through the self‐assembly reactions of Ln(NO3)3 ⋅ nH2O, Co(NO3)2 ⋅ 6H2O, 2,3‐dichlorobenzoic acid (2,3‐HDCB), NaOH and 1,10‐phenanthroline (phen) under solvothermal conditions. Their crystal structures were determined by single‐crystal X‐ray diffraction. They were also characterized by elemental analysis, FT‐IR, powder X‐ray diffraction (PXRD) and thermogravimetric analysis (TGA) and differential thermoanalysis (DTA). These seven complexes have the same molecular formula but different crystal structures. Complexes 1–3, 4 and 5 as well as 6 and 7 are crystallographically isomorphous, respectively. They all exhibit zero‐dimensional (0D) linear tetranuclear cluster structures. These 0D linear tetranuclear clusters can be further connected into a two‐dimensional (2D) supramolecular network via the extensive intermolecular π–π interactions between 2,3‐DCB and phen. The photoluminescent properties of 3, 5 and 6 and the magnetic properties of 1–2 and 4–7 were investigated. Complex 6 shows a slow magnetic relaxation behavior.

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“…Heterometallic (3d-4f ) coordination clusters are versatile compounds that have potential applications in many disciplines such as in magnetism, catalysis, and photophysical [1][2][3][4] and are rarely explored in inorganic biochemistry. [5] Therefore, work in this research area needs to be further expanded to enrich the library of these types of coordination systems and open the door for new phenomenon and applications.…”

Section: Introductionmentioning

confidence: 99%

Heterometallic decanuclear [Fe₆–Ln₄] coordination clusters with enzymatic mimic activity: Synthesis, structures, magnetic properties, and evaluation of catecholase activity

Akhtar

AlDamen

Shahid

et al. 2022

Applied Organom Chemis

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Three [Fe 6 -Ln 4 ] clusters are isolated through N-methyldiethanolamine (H 2 mdea) and 3,5-dinitrobenzoic acid (Hdnbz) acting as ligands together with sodium azide. The X-ray study demonstrates that these compounds are isostructural formulated as [Fe 6 Ln 4 (μThe catecholase activity for the clusters (1-3) was also studied in methanol by ultraviolet-visible spectrophotometry via 3,5-di-tertiarybutyl catechol (3,5-DTBC) employed as a model substrate for the identification of the compounds as a functional model for metalloenzymes. During this study, the parameters for catecholase activity are estimated as K cat = 1022.12 (1), 827.76(2), 562.36 (3) h À1 ; KM = 0.6858 (1), 0.6467 (2), 0.4872 (3) M; and V max = 0.2840 (1), 0.2291 (2), 0.1556 (3) M min À1 . In the Fe-4f system, such a type of activity is determined for the first time. The magnetic studies indicate the antiferromagnetic (AF) interactions between the metal centers.

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Structural effect on NIR luminescence of three salen type heteropolynuclear 3d − 4f erbium complexes

Cited by 6 publications

References 30 publications

Syntheses, Crystal Structures, and Luminescence of Hexafluoroacetylacetone Dinuclear Lanthanide Complexes Bridged by “Back-to-Back” Bisterpyridine

Syntheses, Crystal Structures, and Luminescence of Hexafluoroacetylacetone Dinuclear Lanthanide Complexes Bridged by “Back-to-Back” Bisterpyridine

Synthesis, structure, photoluminescence and magnetism of a series of cobalt‐lanthanide heterometallic complexes originated from 2,3‐dichlorobenzoate and 1,10‐phenanthroline

Heterometallic decanuclear [Fe₆–Ln₄] coordination clusters with enzymatic mimic activity: Synthesis, structures, magnetic properties, and evaluation of catecholase activity

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Structural effect on NIR luminescence of three salen type heteropolynuclear 3d − 4f erbium complexes

Cited by 6 publications

References 30 publications

Syntheses, Crystal Structures, and Luminescence of Hexafluoroacetylacetone Dinuclear Lanthanide Complexes Bridged by “Back-to-Back” Bisterpyridine

Syntheses, Crystal Structures, and Luminescence of Hexafluoroacetylacetone Dinuclear Lanthanide Complexes Bridged by “Back-to-Back” Bisterpyridine

Synthesis, structure, photoluminescence and magnetism of a series of cobalt‐lanthanide heterometallic complexes originated from 2,3‐dichlorobenzoate and 1,10‐phenanthroline

Heterometallic decanuclear [Fe6–Ln4] coordination clusters with enzymatic mimic activity: Synthesis, structures, magnetic properties, and evaluation of catecholase activity

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Heterometallic decanuclear [Fe₆–Ln₄] coordination clusters with enzymatic mimic activity: Synthesis, structures, magnetic properties, and evaluation of catecholase activity