Hybrid Membrane of Agarose and Lanthanide Coordination Polymer: a Selective and Sensitive Fe³⁺ Sensor

Abstract

A new hybrid membrane was prepared by a facile method based on a highly luminescent lanthanide coordination polymer and agarose. The soft membrane was characterized by FT-IR, PXRD, SEM and luminescence. It is found that the soft membrane is a highly selective and sensitive sensor, among 19 metal ion solutions of Fe(3+), Mg(2+), Li(+), Ca(2+), Zn(2+), Cu(2+), Ba(2+), Mn(2+), Ru(3+), Cr(3+), Ag(+), Sr(2+), Cd(2+), Na(+), Ni(2+), Pb(2+), Fe(2+), Hg(2+) and Ca(2+), only Fe(3+) quench the luminescence. The sensing results can be distinguished by the naked eye in daylight or by irradiation of a portable UV light at the scene. Mechanism studies reveal the sensing is due to the decomposition of the coordination polymer 1 which induced by slow permeation of Fe(3+). Further studies found anions of BO3(-), CO3(2-), H2PO4(-), Br(-), Cl(-), ClO4(-), H2PO4(-), I(-), IO3(-) and NO3(-) will not quench the luminescence of the hybrid membrane, which imply that other anions in water would not disturb the detection result.

Structural data of highly luminescent lanthanide complexes constructed by bis-tridentate ligand and as sensor for Et2O

“…PXRD peak positions of bulk sample 1a compete well with its simulated result, suggesting high phase purity of the as synthesized 1a ( Fig. 2 ) [2] , [3] , [4] , [5] , [6] , [7] , [8] . Bond lengths and angles for 1a–1c are in line with the reported lanthanide complexes [9] , [10] , [11] , [12] , [13] , [14] , which are listed in Table 1 , Table 2 , Table 3 .…”

“…The structure was refined by full-matrix least-squares methods with SHELXL-97 module. Phase purity of bulk sample was determined on a DMAX2200VPC diffractometer [2] .…”

Lanthanide Coordination Polymer Nanosheet Aggregates: Solvothermal Synthesis and Downconversion Luminescence

“…Due to the unique properties of rare earth elements, the downward luminescent property of sample 1 was determined at the excitation wavelength of 320 nm under ambient temperature. Sample 1 exhibits characteristic transitions of the Tb 3+ ion at 489, 544, 583, and 621 nm, corresponding to the transitions of 5 Figure 6) [16][17][18][19]. The strongest peak is ascribed to the transition of 5 D 4 → 7 F 5 [4,[20][21][22].…”

Waste PET as a Reactant for Lanthanide MOF Synthesis and Application in Sensing of Picric Acid

“…From Stern-Volmer (S-V) plots we were able to calculate the quenching constants and the quenching efficiency of the analytes using the S-V equation, as follows: (I0/I) = KSV[A] + 1, where I0 and I are the luminescent intensity in the absence and presence of the analyte, respectively, [A] is analyte concentration, and KSV is the quenching constant. [33,34] As a result, the KSV of 8 × 10 3 M −1 could be calculated and the limit of detection for TNP could be estimated to be 1 × 10 −5 M (ΔS/N = 3) ( Figure S2, Supplementary Materials) [35,36]. Anti-interference ability is one of the indicators for one luminescence sensor.…”