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Applications of fluorescent sensor based on 1H-pyrazolo[3,4-b]quinoline in analytical chemistry.

Mac M, Uchacz T, Danel A, Musiolik H - J Fluoresc (2013)

Bottom Line: Relatively high sensitivity but poor selectivity of the amino alcohol that contains indicator towards the two-valued cations was observed.However, upon addition of some amounts of water the selectivity of this sensor has been enhanced (especially towards lead cation).The preliminary results in analytical application of the sensor are discussed.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060, Krakow, Poland.

ABSTRACT
Fluorescent dye 2-[(2-Hydroxyethyl)-(1,3-diphenyl-1H-pyrazolo[3,4-b]quinolin-6-ylmethyl)-amino]ethanol (LL1) was examined for its efficiency in the detection of small inorganic cations (lithium, sodium, barium, calcium, magnesium, cadmium, lead and zinc). The dye was synthesized in the laboratory and investigated by means of both, steady-state and time-resolved fluorescence techniques. This compound acts as a fluorescent sensor suitable for detection of small inorganic cations (lithium, sodium, barium, calcium, magnesium, cadmium, lead and zinc) in strongly polar solvent (acetonitrile). An electron transfer from the electro-donative part (receptor) of the molecule to the acceptor part (fluorophore) is thought to be the main mechanism that underlies functionality of the compound as a sensor. This process can be retarded upon complexation of the receptor moiety by inorganic cations. Relatively high sensitivity but poor selectivity of the amino alcohol that contains indicator towards the two-valued cations was observed. However, upon addition of some amounts of water the selectivity of this sensor has been enhanced (especially towards lead cation). The preliminary results in analytical application of the sensor are discussed.

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Dependence of the integrated fluorescence of the mixture of LL1 (4 × 10−5M) and Zn(ClO4)2 (1 × 10−3M) on the volume of the added TBACl (concentration 2 × 10−2M). Initial volume of the mixture of LL1 and Zn(ClO4)2 is 1 ml. Inset: the first derivative of the titration curve with a minimum (equivalence point) c.a. 0.11 ml of TBACl
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Fig6: Dependence of the integrated fluorescence of the mixture of LL1 (4 × 10−5M) and Zn(ClO4)2 (1 × 10−3M) on the volume of the added TBACl (concentration 2 × 10−2M). Initial volume of the mixture of LL1 and Zn(ClO4)2 is 1 ml. Inset: the first derivative of the titration curve with a minimum (equivalence point) c.a. 0.11 ml of TBACl

Mentions: Another example of the fluorimetric titration is the reaction of zinc perchlorate (Zn(ClO4)2) with TBACl in acetonitrile. In this system a precipitation of the zinc chloride, that is soluble in acetonitrile, is not observed but the product reacts with an excess of chloride anions to form an anion complex (ZnCl4)2- [19]. Again, this anion does not form a fluorescent complex with the LL1 dye. The fluorimetric titration profile is displayed in Fig. 6.Fig. 6


Applications of fluorescent sensor based on 1H-pyrazolo[3,4-b]quinoline in analytical chemistry.

Mac M, Uchacz T, Danel A, Musiolik H - J Fluoresc (2013)

Dependence of the integrated fluorescence of the mixture of LL1 (4 × 10−5M) and Zn(ClO4)2 (1 × 10−3M) on the volume of the added TBACl (concentration 2 × 10−2M). Initial volume of the mixture of LL1 and Zn(ClO4)2 is 1 ml. Inset: the first derivative of the titration curve with a minimum (equivalence point) c.a. 0.11 ml of TBACl
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC3824276&req=5

Fig6: Dependence of the integrated fluorescence of the mixture of LL1 (4 × 10−5M) and Zn(ClO4)2 (1 × 10−3M) on the volume of the added TBACl (concentration 2 × 10−2M). Initial volume of the mixture of LL1 and Zn(ClO4)2 is 1 ml. Inset: the first derivative of the titration curve with a minimum (equivalence point) c.a. 0.11 ml of TBACl
Mentions: Another example of the fluorimetric titration is the reaction of zinc perchlorate (Zn(ClO4)2) with TBACl in acetonitrile. In this system a precipitation of the zinc chloride, that is soluble in acetonitrile, is not observed but the product reacts with an excess of chloride anions to form an anion complex (ZnCl4)2- [19]. Again, this anion does not form a fluorescent complex with the LL1 dye. The fluorimetric titration profile is displayed in Fig. 6.Fig. 6

Bottom Line: Relatively high sensitivity but poor selectivity of the amino alcohol that contains indicator towards the two-valued cations was observed.However, upon addition of some amounts of water the selectivity of this sensor has been enhanced (especially towards lead cation).The preliminary results in analytical application of the sensor are discussed.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060, Krakow, Poland.

ABSTRACT
Fluorescent dye 2-[(2-Hydroxyethyl)-(1,3-diphenyl-1H-pyrazolo[3,4-b]quinolin-6-ylmethyl)-amino]ethanol (LL1) was examined for its efficiency in the detection of small inorganic cations (lithium, sodium, barium, calcium, magnesium, cadmium, lead and zinc). The dye was synthesized in the laboratory and investigated by means of both, steady-state and time-resolved fluorescence techniques. This compound acts as a fluorescent sensor suitable for detection of small inorganic cations (lithium, sodium, barium, calcium, magnesium, cadmium, lead and zinc) in strongly polar solvent (acetonitrile). An electron transfer from the electro-donative part (receptor) of the molecule to the acceptor part (fluorophore) is thought to be the main mechanism that underlies functionality of the compound as a sensor. This process can be retarded upon complexation of the receptor moiety by inorganic cations. Relatively high sensitivity but poor selectivity of the amino alcohol that contains indicator towards the two-valued cations was observed. However, upon addition of some amounts of water the selectivity of this sensor has been enhanced (especially towards lead cation). The preliminary results in analytical application of the sensor are discussed.

Show MeSH
Related in: MedlinePlus