Luminescence and crystal field analysis of Eu3+ in Eu[Co(CN)6]·4H2O

Zhou, Xianju; Duan, Chang‐Kui; Tanner, Peter A.

doi:10.1016/j.jpcs.2007.05.023

Cited by 10 publications

(3 citation statements)

References 12 publications

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“… ν CN s of EuCo (2150 and 2158 cm –1 ) slightly shifted from those of TbCo in the lower-wavenumber region because the electron density of an σ* orbital was reduced by Tb III ions with smaller ionic radii compared with Eu III ions by the lanthanoid contraction (Figure S4c). , Single ν CN peaks were observed for TbRu and EuRu (2065 and 2069 cm –1 , respectively) because all CN – moieties are crystallographically equivalent as evidenced by the crystal structure of [La III (H 2 O) 3 ][Fe III (CN) 6 ]·2H 2 O (Figure S4b,d). ν CN s of TbRu and EuRu shifted from those of TbCo and EuCo (≥2150 cm –1 ) in the lower-wavenumber region because the electron density of an σ* orbital was reduced by the coordination to trivalent Co III ions compared with divalent Ru II ions …”

Section: Results and Discussionmentioning

confidence: 99%

Heterogeneous Catalysis of Lanthanoid Ions for the Hydrolysis of p-Nitrophenyl Phosphate Enhanced by Incorporation to Cyano-Bridged Heterometallic Coordination Polymers

2022

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Solid materials containing lanthanoid ions (LnIII = TbIII or EuIII), i.e., lanthanoid oxide (LnIII 2O3), lanthanoid ions immobilized on silica–alumina by cation exchange (LnIII/Al-SiO2), and lanthanoid ions incorporated into cyano-bridged heterometallic coordination polymers ([LnIII(H2O) x ] y [MC(CN)6], LnIII = TbIII or EuIII; MC = FeIII or RuII; x ≥ 2), were examined as heterogeneous catalysts for hydrolysis of p-nitrophenyl phosphate (p-NPP). LnIII 2O3 and LnIII/Al-SiO2 exhibit lower catalytic activity (∼50% and ∼55% for 72 h, respectively) than LnIII ions used as homogeneous catalysts (∼65%) for the hydrolysis of p-NPP. Ex situ IR measurements after the hydrolysis of p-NPP indicated that active sites of the heterogeneous catalysts were inhibited by a product of dihydrogen phosphate. On the other hand, [LnIII(H2O) x ] y [MC(CN)6] exhibited higher activity (≥81%) for the hydrolysis of p-NPP compared with not only the homogeneous LnIII-ion catalysts but also cyano-bridged heterometallic coordination polymers containing 3d-metal ions such as FeIII ions (38%) previously reported as active catalysts. The high activity of [LnIII(H2O) x ] y [MC(CN)6] resulted from suitable interaction among LnIII ions in the coordination polymers, p-NPP, and water as evidenced by the ex situ IR measurements.

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Section: Results and Discussionmentioning

confidence: 99%

Heterogeneous Catalysis of Lanthanoid Ions for the Hydrolysis of p-Nitrophenyl Phosphate Enhanced by Incorporation to Cyano-Bridged Heterometallic Coordination Polymers

2022

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“…Among the rich diversity of reported hexacyanidometallates [43], only hexacyanido- chromate(III) and hexacyanidocobaltate(III) ions were applied in the construction of photoluminescent d–f coordination networks (Figure 5 and Figure 6, Table 3) [89,90,91,92,93,94,95,96,97,98,99,100]. They reveal the near-infrared and red emission bands, respectively, due to their metal-centred d-d electronic transitions [30,31].…”

Section: Hexacyanidometallates [Miii(cn)6]3− (M = Cr Co)mentioning

confidence: 99%

“…The GdCo and GdCr networks exhibit the d-metal-centred characteristic photoluminescence, observed even at room temperature due to the heavy atom effect [91]. Among the other analogues, the emission properties of the EuCo network was only reported, and red Eu 3+ photoluminescence sensitized by the Co 3+ -to-Eu 3+ energy transfer was presented [92,93]. It suggested that [Co III (CN) 6 ] 3− can be a reasonable sensitizer for the visible photoluminescence of 4f metal ions.…”

Section: Hexacyanidometallates [Miii(cn)6]3− (M = Cr Co)mentioning

confidence: 99%

Lanthanide Photoluminescence in Heterometallic Polycyanidometallate-Based Coordination Networks

2017

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Solid-state functional luminescent materials arouse an enormous scientific interest due to their diverse applications in lighting, display devices, photonics, optical communication, low energy scintillation, optical storage, light conversion, or photovoltaics. Among all types of solid luminophors, the emissive coordination polymers, especially those based on luminescent trivalent lanthanide ions, exhibit a particularly large scope of light-emitting functionalities, fruitfully investigated in the aspects of chemical sensing, display devices, and bioimaging. Here, we present the complete overview of one of the promising families of photoluminescent coordination compounds, that are heterometallic d–f cyanido-bridged networks composed of lanthanide(3+) ions connected through cyanide bridges with polycyanidometallates of d-block metal ions. We are showing that the combination of cationic lanthanide complexes of selected inorganic and organic ligands with anionic homoligand [M(CN)x]n− (x = 2, 4, 6 and 8) or heteroligand [M(L)(CN)4]2− (L = bidentate organic ligand, M = transition metal ions) anions is the efficient route towards the emissive coordination networks revealing important optical properties, including 4f-metal-centred visible and near-infrared emission sensitized through metal-to-metal and/or ligand-to-metal energy transfer processes, and multi-coloured photoluminescence switchable by external stimuli such as excitation wavelength, temperature, or pressure.

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