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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: This process can be retarded upon complexation of the receptor moiety by inorganic cations.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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a Dependence of the integrated fluorescence intensity of LL1 as a function of magnesium, barium and silver perchlorate concentration in acetonitrile. The solid line represent the values calculated from Eq. 3 with the association constant K2 = 7.9 × 108 M−2. b Job’s plot of Ba2+ versus ([LL1] + [Ba2+] =80 μM) at 490 nm emission wavelength and presentation of the fitted function (4a) to experimental data
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Fig3: a Dependence of the integrated fluorescence intensity of LL1 as a function of magnesium, barium and silver perchlorate concentration in acetonitrile. The solid line represent the values calculated from Eq. 3 with the association constant K2 = 7.9 × 108 M−2. b Job’s plot of Ba2+ versus ([LL1] + [Ba2+] =80 μM) at 490 nm emission wavelength and presentation of the fitted function (4a) to experimental data

Mentions: Similar behaviour has been observed in the experiments when other cations were added. The examples of the titration curves are presented in Fig. 3.Fig. 3


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)

a Dependence of the integrated fluorescence intensity of LL1 as a function of magnesium, barium and silver perchlorate concentration in acetonitrile. The solid line represent the values calculated from Eq. 3 with the association constant K2 = 7.9 × 108 M−2. b Job’s plot of Ba2+ versus ([LL1] + [Ba2+] =80 μM) at 490 nm emission wavelength and presentation of the fitted function (4a) to experimental data
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3824276&req=5

Fig3: a Dependence of the integrated fluorescence intensity of LL1 as a function of magnesium, barium and silver perchlorate concentration in acetonitrile. The solid line represent the values calculated from Eq. 3 with the association constant K2 = 7.9 × 108 M−2. b Job’s plot of Ba2+ versus ([LL1] + [Ba2+] =80 μM) at 490 nm emission wavelength and presentation of the fitted function (4a) to experimental data
Mentions: Similar behaviour has been observed in the experiments when other cations were added. The examples of the titration curves are presented in Fig. 3.Fig. 3

Bottom Line: This process can be retarded upon complexation of the receptor moiety by inorganic cations.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