Rhodizonate complexes with transition metal ions: A new vision from an old building block

Souza, Helder de; Faria, Luiz F. O.; Scaldini, Felipe Mageste; Diniz, Renata; Edwards, Howell G. M.; Oliveira, Luiz Fernando Cappa de

doi:10.1016/j.molstruc.2021.130407

Cited by 1 publication

(4 citation statements)

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“…The IIP prepared followed a modified methodology of the previous proposal [ 19 ]. According to previous studies [ 13 ], instability of the rhodizonate ligand against light and under basic solution conditions is evident. To prevent this condition from affecting the polymerization performance and, therefore, the adsorption capacity of the polymeric material, modifications were considered, such as keeping the container completely covered to avoid light incidence in any way.…”

Section: Resultsmentioning

confidence: 94%

“…The colorimetric interaction between Pb 2+ and some reagents has generated materials whose application also involves color changes, which allows for colorimetric quantification [ 6 , 12 , 13 , 14 , 15 , 16 ]. One of the reagents that has shown a strong interaction with Pb 2+ is sodium rhodizonate.…”

Section: Introductionmentioning

confidence: 99%

“…The use of sodium rhodizonate in criminal analysis is very common and is considered a very sensitive and specific test [ 12 ]. The interaction between sodium rhodizonate and lead is based on the formation of a colored complex (reddish coloration) by resonance, where two rhodizonate molecules form a ring around the lead and the oxygens of the rhodizonate enol groups complex the metal [ 13 ]. In the literature, there are a few precedents for the use of rhodizonate in the detection of lead [ 13 , 16 ], as well as the use of rhodizonate for the detection of Pb 2+ in water samples using adsorbent papers impregnated with the reagent [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

“…The interaction between sodium rhodizonate and lead is based on the formation of a colored complex (reddish coloration) by resonance, where two rhodizonate molecules form a ring around the lead and the oxygens of the rhodizonate enol groups complex the metal [ 13 ]. In the literature, there are a few precedents for the use of rhodizonate in the detection of lead [ 13 , 16 ], as well as the use of rhodizonate for the detection of Pb 2+ in water samples using adsorbent papers impregnated with the reagent [ 6 ]. More recent studies indicate that the interaction between rhodizonate and lead is very strong and specific due to the predetermined orientation of the coordination geometry generated by the rhodizonate ligand [ 6 , 13 , 16 ]; thus, a prevalence of ion chelation is observed in Pb 2+ in the presence of other metals in the colorimetric detection of Pb (II).…”

Section: Introductionmentioning

confidence: 99%

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Smartphone-Based Rapid Quantitative Detection Platform with Imprinted Polymer for Pb (II) Detection in Real Samples

Meza López,

Hernández,

Vega-Chacón

et al. 2024

Polymers

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This paper reports the successful development and application of an efficient method for quantifying Pb2+ in aqueous samples using a smartphone-based colorimetric device with an imprinted polymer (IIP). The IIP was synthesized by modifying the previous study; using rhodizonate, 2-acrylamido-2-methylpropane sulfonic acid (AMPS), N,N′-methylenebisacrylamide (MBA), and potassium persulfate (KPS). The polymers were then characterized. An absorption study was performed to determine the optimal conditions for the smartphone-based colorimetric device processing. The device consists of a black box (10 × 10 × 10 cm), which was designed to ensure repeatability of the image acquisition. The methodology involved the use of a smartphone camera to capture images of IIP previously exposed at Pb2+ solutions with various concentrations, and color channel values were calculated (RGB, YMK HSVI). PLS multivariate regression was performed, and the optimum working range (0–10 mg L−1) was determined using seven principal components with a detection limit (LOD) of 0.215 mg L−1 and R2 = 0.998. The applicability of a colorimetric sensor in real samples showed a coefficient of variation (% RSD) of less than 9%, and inductively coupled plasma mass spectrometry (ICP-MS) was applied as the reference method. These results confirmed that the quantitation smartphone-based colorimetric sensor is a suitable analytical tool for reliable on-site Pb2+ monitoring.

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Section: Resultsmentioning

confidence: 94%