The Experts below are selected from a list of 51 Experts worldwide ranked by ideXlab platform
Murat Koca - One of the best experts on this subject based on the ideXlab platform.
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spectral characterization of a newly synthesized fluorescent Semicarbazone Derivative and its usage as a selective fiber optic sensor for copper ii
Analytica Chimica Acta, 2007Co-Authors: Ozlem Oter, Kadriye Ertekin, Cumhur Kirilmis, Murat KocaAbstract:Abstract In this work photoluminescent properties of highly Cu 2+ selective organic fluoroionophore, Semicarbazone Derivative; bis(naphtho[2,1- b ]furan-2-yl)methanone Semicarbazone (BNF) was investigated in different solvents (dichloromethane, tetrahydrofuran, toluene and ethanol) and in polymer matrices of polyvinylchloride (PVC) and ethyl cellulose (EC) by absorption and emission spectrometry. The BNF Derivative displayed enhanced fluorescence emission quantum yield, Q f = 6.1 × 10 −2 and molar extinction coefficient, ɛ = 29,000 ± 65 cm −1 M −1 in immobilized PVC matrix, compared to 2.6 × 10 −3 and 24,573 ± 115 in ethanol solution. The offered sensor exhibited remarkable fluorescence intensity quenching upon exposure to Cu 2+ ions at pH 4.0 in the concentration range of 1.0 × 10 −9 to 3.0 × 10 −4 M [Cu 2+ ] while the effects of the responding ions (Ca 2+ , Hg + , Pb 2+ , Al 3+ , Cr 3+ , Mn 2+ , Mg 2+ , Sn 2+ , Cd 2+ , Co 2+ and Ni 2+ ) were less pronounced.
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spectral characterization of a newly synthesized fluorescent Semicarbazone Derivative and its usage as a selective fiber optic sensor for copper ii
Analytica Chimica Acta, 2007Co-Authors: Ozlem Oter, Kadriye Ertekin, Cumhur Kirilmis, Murat KocaAbstract:In this work photoluminescent properties of highly Cu(2+) selective organic fluoroionophore, Semicarbazone Derivative; bis(naphtho[2,1-b]furan-2-yl)methanone Semicarbazone (BNF) was investigated in different solvents (dichloromethane, tetrahydrofuran, toluene and ethanol) and in polymer matrices of polyvinylchloride (PVC) and ethyl cellulose (EC) by absorption and emission spectrometry. The BNF Derivative displayed enhanced fluorescence emission quantum yield, Q(f)=6.1 x 10(-2) and molar extinction coefficient, epsilon=29,000+/-65 cm(-1)M(-1) in immobilized PVC matrix, compared to 2.6 x 10(-3) and 24,573+/-115 in ethanol solution. The offered sensor exhibited remarkable fluorescence intensity quenching upon exposure to Cu(2+) ions at pH 4.0 in the concentration range of 1.0 x 10(-9) to 3.0 x 10(-4)M [Cu(2+)] while the effects of the responding ions (Ca(2+), Hg(+), Pb(2+), Al(3+), Cr(3+), Mn(2+), Mg(2+), Sn(2+), Cd(2+), Co(2+) and Ni(2+)) were less pronounced.
Y K Agrawal - One of the best experts on this subject based on the ideXlab platform.
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polymer supported calix 4 arene Semicarbazone Derivative for separation and preconcentration of la iii ce iii th iv and u vi
Reactive & Functional Polymers, 2002Co-Authors: Vinod K Jain, Avtar K Handa, Pranav S Shrivastav, Rujul A Pandya, Y K AgrawalAbstract:Abstract The new “upper-rim” functionalized 11,23-disemicarbazono-26,28- n -dipropoxy-25,27-dihydroxy calix[4]arene has been synthesized by condensing 11,23-diformyl-26,28- n -dipropoxy-25,27-dihydroxy calix[4]arene with semicarbazide hydrochloride. This calix[4]arene-Semicarbazone Derivative was then covalently linked with commercially available Merrifield’s peptide resin at the “lower-rim” to obtain polymeric chelating resin and its analytical properties were investigated. The resin was then used successfully for the separation and preconcentration of lanthanum(III), cerium(III), thorium(IV) and uranium(VI) prior to their determination by spectrophotometry and inductively coupled plasma atomic emission spectroscopy. The resin exhibits good separating ability with maximum sorption between pH 2.5–4.5 for Th(IV) and between pH 5.5–7.0 for U(VI) whereas La(III) and Ce(III) were found to have maximum sorption between pH 6.5–8.5. The elution studies were carried out with 0.01 M HCl for La(III) and Ce(III), 2.0 M HCl for Th(IV) and 0.25 M HCl for U(VI). The preconcentration factors for La(III), Ce(III), Th(IV) and U(VI) were 125, 130, 102 and 108, respectively. The resin shows good stability along with faster rate of equilibrium for all the metal ions. The influence of several ions (cations and anions) on the resin performance is also discussed. The relative standard deviation was between 96 and 98% with good analytical reliability. The proposed method was applied for the determination of metal ions in monazite sand and some standard geological materials.
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Polymer supported calix[4]arene-Semicarbazone Derivative for separation and preconcentration of La(III), Ce(III), Th(IV) and U(VI)
'Elsevier BV', 2002Co-Authors: Vk Jain, Handa A, Pandya R, Shrivastav P, Y K AgrawalAbstract:The new "upper-rim" functionalized 11,23-disemicarbazono-26,28-n-dipropoxy-25,27-dihydroxy calix[4]arene has been synthesized by condensing 11,23-diformyl-26,28-n-dipropoxy-25,27-dihydroxy calix[4]arene with semicarbazide hydrochloride. This calix[4]arene-Semicarbazone Derivative was then covalently linked with commercially available Merrifield's peptide resin at the "lower-rim" to obtain polymeric chelating resin and its analytical properties were investigated. The resin was then used successfully for the separation and preconcentration of lanthanum(III), cerium(III), thorium(IV) and uranium(VI) prior to their determination by spectrophotometry and inductively coupled plasma atomic emission spectroscopy. The resin exhibits good separating ability with maximum sorption between pH 2.5-4.5 for Th(IV) and between pH 5.5-7.0 for U(VI) whereas La(III) and Ce(III) were found to have maximum sorption between pH 6.5-8.5. The elution studies were carried out with 0.01 M HCl for La(III) and Ce(III), 2.0 M HCl for Th(IV) and 0.25 M HCl for U(VI). The preconcentration factors for La(III), Ce(III), Th(IV) and U(VI) were 125, 130, 102 and 108, respectively. The resin shows good stability along with faster rate of equilibrium for all the metal ions. The influence of several ions (cations and anions) on the resin performance is also discussed. The relative standard deviation was between 96 and 98% with good analytical reliability. The proposed method was applied for the determination of metal ions in monazite sand and some standard geological materials. © 2002 Elsevier Science B.V. All rights reserved
Ozlem Oter - One of the best experts on this subject based on the ideXlab platform.
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spectral characterization of a newly synthesized fluorescent Semicarbazone Derivative and its usage as a selective fiber optic sensor for copper ii
Analytica Chimica Acta, 2007Co-Authors: Ozlem Oter, Kadriye Ertekin, Cumhur Kirilmis, Murat KocaAbstract:Abstract In this work photoluminescent properties of highly Cu 2+ selective organic fluoroionophore, Semicarbazone Derivative; bis(naphtho[2,1- b ]furan-2-yl)methanone Semicarbazone (BNF) was investigated in different solvents (dichloromethane, tetrahydrofuran, toluene and ethanol) and in polymer matrices of polyvinylchloride (PVC) and ethyl cellulose (EC) by absorption and emission spectrometry. The BNF Derivative displayed enhanced fluorescence emission quantum yield, Q f = 6.1 × 10 −2 and molar extinction coefficient, ɛ = 29,000 ± 65 cm −1 M −1 in immobilized PVC matrix, compared to 2.6 × 10 −3 and 24,573 ± 115 in ethanol solution. The offered sensor exhibited remarkable fluorescence intensity quenching upon exposure to Cu 2+ ions at pH 4.0 in the concentration range of 1.0 × 10 −9 to 3.0 × 10 −4 M [Cu 2+ ] while the effects of the responding ions (Ca 2+ , Hg + , Pb 2+ , Al 3+ , Cr 3+ , Mn 2+ , Mg 2+ , Sn 2+ , Cd 2+ , Co 2+ and Ni 2+ ) were less pronounced.
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spectral characterization of a newly synthesized fluorescent Semicarbazone Derivative and its usage as a selective fiber optic sensor for copper ii
Analytica Chimica Acta, 2007Co-Authors: Ozlem Oter, Kadriye Ertekin, Cumhur Kirilmis, Murat KocaAbstract:In this work photoluminescent properties of highly Cu(2+) selective organic fluoroionophore, Semicarbazone Derivative; bis(naphtho[2,1-b]furan-2-yl)methanone Semicarbazone (BNF) was investigated in different solvents (dichloromethane, tetrahydrofuran, toluene and ethanol) and in polymer matrices of polyvinylchloride (PVC) and ethyl cellulose (EC) by absorption and emission spectrometry. The BNF Derivative displayed enhanced fluorescence emission quantum yield, Q(f)=6.1 x 10(-2) and molar extinction coefficient, epsilon=29,000+/-65 cm(-1)M(-1) in immobilized PVC matrix, compared to 2.6 x 10(-3) and 24,573+/-115 in ethanol solution. The offered sensor exhibited remarkable fluorescence intensity quenching upon exposure to Cu(2+) ions at pH 4.0 in the concentration range of 1.0 x 10(-9) to 3.0 x 10(-4)M [Cu(2+)] while the effects of the responding ions (Ca(2+), Hg(+), Pb(2+), Al(3+), Cr(3+), Mn(2+), Mg(2+), Sn(2+), Cd(2+), Co(2+) and Ni(2+)) were less pronounced.
Cumhur Kirilmis - One of the best experts on this subject based on the ideXlab platform.
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spectral characterization of a newly synthesized fluorescent Semicarbazone Derivative and its usage as a selective fiber optic sensor for copper ii
Analytica Chimica Acta, 2007Co-Authors: Ozlem Oter, Kadriye Ertekin, Cumhur Kirilmis, Murat KocaAbstract:Abstract In this work photoluminescent properties of highly Cu 2+ selective organic fluoroionophore, Semicarbazone Derivative; bis(naphtho[2,1- b ]furan-2-yl)methanone Semicarbazone (BNF) was investigated in different solvents (dichloromethane, tetrahydrofuran, toluene and ethanol) and in polymer matrices of polyvinylchloride (PVC) and ethyl cellulose (EC) by absorption and emission spectrometry. The BNF Derivative displayed enhanced fluorescence emission quantum yield, Q f = 6.1 × 10 −2 and molar extinction coefficient, ɛ = 29,000 ± 65 cm −1 M −1 in immobilized PVC matrix, compared to 2.6 × 10 −3 and 24,573 ± 115 in ethanol solution. The offered sensor exhibited remarkable fluorescence intensity quenching upon exposure to Cu 2+ ions at pH 4.0 in the concentration range of 1.0 × 10 −9 to 3.0 × 10 −4 M [Cu 2+ ] while the effects of the responding ions (Ca 2+ , Hg + , Pb 2+ , Al 3+ , Cr 3+ , Mn 2+ , Mg 2+ , Sn 2+ , Cd 2+ , Co 2+ and Ni 2+ ) were less pronounced.
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spectral characterization of a newly synthesized fluorescent Semicarbazone Derivative and its usage as a selective fiber optic sensor for copper ii
Analytica Chimica Acta, 2007Co-Authors: Ozlem Oter, Kadriye Ertekin, Cumhur Kirilmis, Murat KocaAbstract:In this work photoluminescent properties of highly Cu(2+) selective organic fluoroionophore, Semicarbazone Derivative; bis(naphtho[2,1-b]furan-2-yl)methanone Semicarbazone (BNF) was investigated in different solvents (dichloromethane, tetrahydrofuran, toluene and ethanol) and in polymer matrices of polyvinylchloride (PVC) and ethyl cellulose (EC) by absorption and emission spectrometry. The BNF Derivative displayed enhanced fluorescence emission quantum yield, Q(f)=6.1 x 10(-2) and molar extinction coefficient, epsilon=29,000+/-65 cm(-1)M(-1) in immobilized PVC matrix, compared to 2.6 x 10(-3) and 24,573+/-115 in ethanol solution. The offered sensor exhibited remarkable fluorescence intensity quenching upon exposure to Cu(2+) ions at pH 4.0 in the concentration range of 1.0 x 10(-9) to 3.0 x 10(-4)M [Cu(2+)] while the effects of the responding ions (Ca(2+), Hg(+), Pb(2+), Al(3+), Cr(3+), Mn(2+), Mg(2+), Sn(2+), Cd(2+), Co(2+) and Ni(2+)) were less pronounced.
Kadriye Ertekin - One of the best experts on this subject based on the ideXlab platform.
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spectral characterization of a newly synthesized fluorescent Semicarbazone Derivative and its usage as a selective fiber optic sensor for copper ii
Analytica Chimica Acta, 2007Co-Authors: Ozlem Oter, Kadriye Ertekin, Cumhur Kirilmis, Murat KocaAbstract:Abstract In this work photoluminescent properties of highly Cu 2+ selective organic fluoroionophore, Semicarbazone Derivative; bis(naphtho[2,1- b ]furan-2-yl)methanone Semicarbazone (BNF) was investigated in different solvents (dichloromethane, tetrahydrofuran, toluene and ethanol) and in polymer matrices of polyvinylchloride (PVC) and ethyl cellulose (EC) by absorption and emission spectrometry. The BNF Derivative displayed enhanced fluorescence emission quantum yield, Q f = 6.1 × 10 −2 and molar extinction coefficient, ɛ = 29,000 ± 65 cm −1 M −1 in immobilized PVC matrix, compared to 2.6 × 10 −3 and 24,573 ± 115 in ethanol solution. The offered sensor exhibited remarkable fluorescence intensity quenching upon exposure to Cu 2+ ions at pH 4.0 in the concentration range of 1.0 × 10 −9 to 3.0 × 10 −4 M [Cu 2+ ] while the effects of the responding ions (Ca 2+ , Hg + , Pb 2+ , Al 3+ , Cr 3+ , Mn 2+ , Mg 2+ , Sn 2+ , Cd 2+ , Co 2+ and Ni 2+ ) were less pronounced.
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spectral characterization of a newly synthesized fluorescent Semicarbazone Derivative and its usage as a selective fiber optic sensor for copper ii
Analytica Chimica Acta, 2007Co-Authors: Ozlem Oter, Kadriye Ertekin, Cumhur Kirilmis, Murat KocaAbstract:In this work photoluminescent properties of highly Cu(2+) selective organic fluoroionophore, Semicarbazone Derivative; bis(naphtho[2,1-b]furan-2-yl)methanone Semicarbazone (BNF) was investigated in different solvents (dichloromethane, tetrahydrofuran, toluene and ethanol) and in polymer matrices of polyvinylchloride (PVC) and ethyl cellulose (EC) by absorption and emission spectrometry. The BNF Derivative displayed enhanced fluorescence emission quantum yield, Q(f)=6.1 x 10(-2) and molar extinction coefficient, epsilon=29,000+/-65 cm(-1)M(-1) in immobilized PVC matrix, compared to 2.6 x 10(-3) and 24,573+/-115 in ethanol solution. The offered sensor exhibited remarkable fluorescence intensity quenching upon exposure to Cu(2+) ions at pH 4.0 in the concentration range of 1.0 x 10(-9) to 3.0 x 10(-4)M [Cu(2+)] while the effects of the responding ions (Ca(2+), Hg(+), Pb(2+), Al(3+), Cr(3+), Mn(2+), Mg(2+), Sn(2+), Cd(2+), Co(2+) and Ni(2+)) were less pronounced.
