A PHBA-functionalized organic-inorganic hybrid polyoxometalate as a luminescent probe for selectively sensing chromium and calcium in aqueous solution

Luminescent Dimeric Oxalate-Bridged Eu3+/Tb3+-Implanted Arsenotungstates: Tunable Emission, Energy Transfer, and Detection of Ba2+ Ion in Aqueous Solution

“…The application of Ln 3+ -incubated materials in detecting metal ions in aqueous solution has captured increasing research attention due to their excellent luminescent performances, good selectivity, and high stability . Therefore, compound 1 was also investigated for probing metal ions in aqueous solution; each compound already includes 17 K + and 2 Na + countercations.…”

“…This unconventional Ba 2+ -induced fluorescence intensity increase could be caused by a possible interaction between Ba 2+ ions and POMs at the oxygen sites. Specifically, the oxygen atoms from the highly negatively charged arsenotungstates can readily bind to Lewis acidic Ba 2+ ions, resulting in the separation of coordinated H 2 O molecules in the coordination sphere of the Eu 3+ ion. ,, In addition, Ba 2+ ions may interact with the coordinated H 2 O molecules from the coordination sphere of the Eu 3+ ion, which leads to an enhancement of emission intensity. A similar phenomenon has been described in previous literature. , After centrifugation of a solution containing initially 4 mg of the compound in 2 mL of water and 2 mL of a 2 mM BaCl 2 solution, the characteristic pristine emission peaks in the emission spectrum of the supernatant were significantly reduced (Figure S11a).…”

“…The application of Ln 3+incubated materials in detecting metal ions in aqueous solution has captured increasing research attention due to their excellent luminescent performances, good selectivity, and high stability. 68 Therefore, compound 1 was also investigated for probing metal ions in aqueous solution; each compound already includes 17 K + and 2 Na + countercations. Given the chemical stability and photostability requirements in aqueous metal ion detection, 69−72 the luminescence behavior in aqueous solution was first investigated for compound 1.…”

“…Specifically, the oxygen atoms from the highly negatively charged arsenotungstates can readily bind to Lewis acidic Ba 2+ ions, resulting in the separation of coordinated H 2 O molecules in the coordination sphere of the Eu 3+ ion. 47,68,72 In addition, Ba 2+ ions may interact with the coordinated H 2 O molecules from the coordination sphere of the Eu 3+ ion, which leads to an enhancement of emission intensity. A similar phenomenon has been described in previous literature.…”

Oxalate-bridging NdIII-based arsenotungstate with multifunctional NIR-luminescence and magnetic properties

“…[11][12][13][14][15][16][17][18][19] In recent decades, lots of Ln-POM derivatives with attractive structures and novel physical and chemical properties have been reported. Nevertheless, most of these studies focus solely on the photoluminescence (PL) properties of Ln-POM derivatives, [20][21][22][23][24][25][26][27][28] although there are a few examples demonstrating SMM behaviors. [29][30][31][32][33][34] It is becoming widely accepted that the coordination environment of the Ln center has a great influence on the dynamic relaxation processes of Ln-SMMs.…”