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Bryleva YA, Yzhikova KM, Artem'ev AV, Davydova MP, Rakhmanova MI, Polyakova EV, Glinskaya LA, Samsonenko DG. Synthesis and luminescence of binuclear lanthanide complexes with 4,6-bis(diphenylphosphino)pyrimidine dioxide as a bridging ligand. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.116251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Zhang T, Kitagawa Y, Moriake R, Ferreira da Rosa PP, Islam MJ, Yoneda T, Inokuma Y, Fushimi K, Hasegawa Y. Hybrid Eu III Coordination Luminophore Standing on Two Legs on Silica Nanoparticles for Enhanced Luminescence. Chemistry 2021; 27:14438-14443. [PMID: 34409670 DOI: 10.1002/chem.202102156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Indexed: 11/05/2022]
Abstract
In this study, we have demonstrated a two-legged, upright molecular design method for monochromatic and bright red luminescent LnIII -silica nanomaterials. A novel EuIII -silica hybrid nanoparticle was developed by using a doubly binding TPPO-Si(OEt)3 (TPPO: triphenyl phosphine oxide) linker. The TPPO-Si(OEt)3 was confirmed by 1 H, 31 P, 29 Si NMR spectroscopy and single-crystal X-ray analysis. Luminescent Eu(hfa)3 and Eu(tfc)3 moieties (hfa: hexafluoroacetylacetonate, tfc: 3-(trifluoromethylhydroxymethylene)camphorate) were fixed onto TPPO-Si(OEt)3 -modified silica nanoparticles, producing Eu(hfa)3 (TPPO-Si)2 -SiO2 and Eu(tfc)3 (TPPO-Si)2 -SiO2 , respectively. Eu(hfa)3 (TPPO-Si)2 -SiO2 exhibited the higher intrinsic luminescence quantum yield (93 %) and longer emission lifetime (0.98 ms), which is much larger than those of previously reported EuIII -based hybrid materials. Eu(tfc)3 (TPPO-Si)2 -SiO2 showed an extra-large intrinsic emission quantum yield (54 %), although the emission quantum yield for the precursor Eu(tfc)3 (TPPO-Si(OEt)3 )2 was found to be 39 %. These results confirmed that the TPPO-Si(OEt)3 linker is a promising candidate for development of EuIII -based luminescent materials.
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Affiliation(s)
- Teng Zhang
- Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo, Hokkaido, 001-0021, Japan
| | - Yuichi Kitagawa
- Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo, Hokkaido, 001-0021, Japan.,Faculty of Engineering, Hokkaido University, Sapporo, Hokkaido, 060-8628, Japan
| | - Ryoma Moriake
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo, Hokkaido, 060-8628, Japan
| | | | - Md Jahidul Islam
- Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo, Hokkaido, 001-0021, Japan
| | - Tomoki Yoneda
- Faculty of Engineering, Hokkaido University, Sapporo, Hokkaido, 060-8628, Japan
| | - Yasuhide Inokuma
- Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo, Hokkaido, 001-0021, Japan.,Faculty of Engineering, Hokkaido University, Sapporo, Hokkaido, 060-8628, Japan
| | - Koji Fushimi
- Faculty of Engineering, Hokkaido University, Sapporo, Hokkaido, 060-8628, Japan
| | - Yasuchika Hasegawa
- Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo, Hokkaido, 001-0021, Japan.,Faculty of Engineering, Hokkaido University, Sapporo, Hokkaido, 060-8628, Japan
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Iwanaga H, Aiga F. Quantum Yield and Photoluminescence Intensity Enhancement Effects of a Diphosphine Dioxide Ligand on a 6-Coordinate Eu(III)-β-Diketonate Complex with Low Luminescence. ACS OMEGA 2021; 6:416-424. [PMID: 33458493 PMCID: PMC7807766 DOI: 10.1021/acsomega.0c04826] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Accepted: 12/03/2020] [Indexed: 05/11/2023]
Abstract
Tris{6,6,7,7,8,8,8-heptafluoro-1-[2-(9,9-dimethylfluorenyl)]-1,3-octanedionate} europium(III) (Eu(III)(hfod)3 1) was synthesized, which was designed to have low luminescence and a large absorption coefficient in order to elucidate the coordination effects of phosphine oxide ligands. The quantum yield (ΦTOT) and photoluminescence intensity of complex 1 were dramatically enhanced by coordinating a diphenyl-4-(dibutylphosphinyl)butyl phosphine oxide (DPDB) ligand, thanks to the increased intrinsic photoluminescence quantum yield of the lanthanide (ΦLn) and the increased energy transfer efficiency (ΦET) in the solution and solid states. In the solid state, there was no energy dissipation by solvent molecules. This excluded the steric shielding effects of the DPDB ligand and allowed the effects of the ligand field environment to be extracted. ΦLn and ΦET of complex 2 were much larger in the solid state than those in the solution state, resulting in larger ΦTOT (solution state: ΦLn 0.50, ΦET 0.42, and ΦTOT 0.21 and solid state: ΦLn 0.74, ΦET 0.47, and ΦTOT 0.35). Larger asymmetry ratios (ratio R) of Eu(III)(hfod)3(DPDB) 2 than those of complex 1 in the solution and solid states indicate that the ligand field of the Eu(III) ion becomes more asymmetric by coordination of the DPDB ligand. Density functional theory calculations showed that ΦLn and ΦET increased when the ligand field around the Eu(III) ion became more asymmetric. Based on these results, we propose a hypothesis on the enhancement of the photoluminescence intensity of 6-coordinated Eu(III)-β-diketonate by a DPDB ligand. When a DPDB ligand coordinates to a Eu(III) ion, the positions of the nearest oxygen atoms around the Eu(III) ion are shifted by steric repulsion and the relative positions of the nearest oxygen atoms are distorted. The distorted coordination environment induces asymmetry in the ligand field, increasing ΦLn and ΦET. ΦTOT is enhanced by the DPDB ligand because it is the product of ΦLn and ΦET. Photoluminescence intensity increases because of the enhanced ΦTOT.
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Affiliation(s)
- Hiroki Iwanaga
- Corporate Research & Development Center, Toshiba Corporation. 1 Komukai-Toshiba-cho, Saiwai-ku, Kawasaki 212-8582, Japan
| | - Fumihiko Aiga
- Corporate Research & Development Center, Toshiba Corporation. 1 Komukai-Toshiba-cho, Saiwai-ku, Kawasaki 212-8582, Japan
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