Pyrazoloanthrone-functionalized fluorescent copolymer for the detection and rapid analysis of nitroaromatics

2021 ◽  
Vol 5 (1) ◽  
pp. 238-248
Author(s):  
S. Saravanan ◽  
Rafiq Ahmad ◽  
S. Kasthuri ◽  
Kunal Pal ◽  
S. Raviteja ◽  
...  
Keyword(s):  
Aqueous Medium ◽  
High Selectivity ◽  
Rapid Analysis ◽  
Fluorescent Copolymer

Pyrazoloanthrone functionalized copolymer exhibit high selectivity and sensitivity towards TNP in aqueous medium in presence of other competitive explosive analytes.

Conventional fluorophore-free dual pH- and thermo-responsive luminescent alternating copolymer

2016 ◽  
Vol 7 (45) ◽  
pp. 6895-6900 ◽  
Author(s):  
Biswajit Saha ◽  
Kamal Bauri ◽  
Arijit Bag ◽  
Pradip K. Ghorai ◽  
Priyadarsi De
Keyword(s):  
Aqueous Medium ◽  
Free Water ◽  
Water Soluble ◽  
Alternating Copolymer ◽  
Fluorescent Copolymer

Herein, we have designed and synthesized a novel traditional fluorophore-free water-soluble fluorescent copolymer based on a poly(maleimide-alt-styrene) skeleton, which responds to both pH and temperature in aqueous medium.

scholarly journals Selective Colorimetric Sensors for Cyanide and Acetate Ion in Partially Aqueous Medium

2018 ◽  
Author(s):  
Divya Singhal ◽  
Neha Gupta ◽  
Ashok Kumar Singh
Keyword(s):  
Detection Limit ◽  
Aqueous Medium ◽  
1H Nmr ◽  
Binding Constant ◽  
High Selectivity ◽  
Good Sensitivity ◽  
Dft Studies ◽  
Nmr Titration ◽  
1H Nmr Titration ◽  
Nanomolar Detection

4-(thiazol-2-yldiazenyl)phenol (L1) and 2-((4-hydroxyphenyl) diazenyl)-5-nitrophenol (L2) based on azo phenol were synthesised and used as selective colorimetric sensor for CN- and AcO− ion in DMSO/H2O-HEPES (v/v; 1:1, pH–7.3 ± 0.2) and showed good sensitivity with large red shifts and nanomolar detection limit for CN- and AcO- ion. The stoichiometry of L1 with CN−/AcO− ion was found to be 1:1 and L2 with CN−/AcO− ion was found to be 1:2. Binding constant for L1+ CN−, L1 + AcO−, L2 + CN− and L2 + AcO− were calculated by B-H plot as 1.6 × 103, 8.0 × 102, 8.4 × 103 and 1.7 × 102 respectively. L2 showed high selectivity towards CN− ion with low detection limit of 81 nM and large binding constant. In addition, 1H NMR titration and DFT studies also supported the deprotonation mechanism of receptors in the presence of selective anions.

A highly selective fluorescent chemosensor based on naphthalimide and Schiff base units for Cu2+ detection in aqueous medium

2017 ◽  
Vol 72 (1) ◽  
pp. 35-41 ◽  
Author(s):  
Yuling Xu ◽  
Stephen Opeyemi Aderinto ◽  
Huilu Wu ◽  
Hongping Peng ◽  
Han Zhang ◽  
...  
Keyword(s):  
Schiff Base ◽  
Fluorescence Quenching ◽  
Aqueous Medium ◽  
High Selectivity ◽  
Photophysical Properties ◽  
Aqueous Media ◽  
Medium Ph ◽  
Absorption And Fluorescence Spectroscopy ◽  
High Fluorescence ◽  
Base Units

AbstractA new Schiff base, 4-allylamine-N-(N-5-methylsalicylidene)-1,8-naphthalimide (1), has been designed and synthesized by combining a 1,8-naphthalimide moiety as a fluorophore and a Schiff base as a recognition group. Its photophysical properties were investigated by absorption and fluorescence spectroscopy, and this sensor exhibits a high fluorescence quantum yield of 0.75–0.91 inorganic solvents of different polarity. It also shows high selectivity for Cu2+ over other ions with fluorescence quenching in aqueous medium (pH=7.2). The reason for this phenomenon (fluorescence quenching) is attributed to the formation of a 1:1 complex between 1 and Cu2+ according to the Job plot and fluorescence titration. The sensor can be applied to the quantification of Cu2+ in a linear fashion from 0.5 to 5 μM with a detection limit of 0.23 μM. Additionally, the association constant (Ka) between Cu2+ and 1 is 1.328×106 M−1 in aqueous media.

A Novel Multifunctional Near-Infrared Absorbing Dye for Hg2+ Recognition

2013 ◽  
Vol 320 ◽  
pp. 460-464
Author(s):  
Lei Hu ◽  
Ya Fei Zhang ◽  
Fang Kuo Wang ◽  
Zheng Quan Yan
Keyword(s):  
Standard Deviation ◽  
Aqueous Medium ◽  
Correlation Coefficient ◽  
Relative Standard Deviation ◽  
Near Infrared ◽  
High Selectivity ◽  
Limit Of Detection ◽  
Colorimetric Sensor ◽  
Uv Absorbance ◽  
Relative Standard

A novel near-infrared absorbing colorimetric sensor with multifunctional groups, bis-dibenzo-18-crown-6 squaraine (BCSQ), has been identified and applied for accurate Hg2+analysis based on the decrement of its UV absorbance (A) in the aqueous medium. The proposed method was successfully applied to analyse synthetic Hg2+samples and natural Hg2+samples. The results show that the linear range of Hg2+detection in aqueous medium is 7.5~150×108mol·L1with a correlation coefficient (R) of 0.9983 and a limit of detection (3σ, n=20) of 5.6 ×109mol·L1. The relative standard deviation (R.S.D.) for Hg2+detection was lower than 2.4% (n=5). The proposed method possesses the advantages of simplicity, rapidity, high selectivity and sensitivity.

scholarly journals Design, Synthesis, and Evaluation of New Colorimetric Chemosensors Containing Quinazolinones Moiety for some Cations Detection in an Aqueous Medium and Biological Sample

2021 ◽  
Vol 65 (3) ◽  
Author(s):  
Ayman. M. Algohary ◽  
Mohamed Hassan ◽  
Sami G. Almalki ◽  
Esam S. Al-Malki
Keyword(s):  
Aqueous Medium ◽  
1H Nmr ◽  
13C Nmr ◽  
Biological Sample ◽  
High Selectivity ◽  
Hydroxylamine Hydrochloride ◽  
Design Synthesis ◽  
Colorimetric Response ◽  
Nitrogen Nucleophiles ◽  
New Compounds

Abstract. The current project deals with designing and synthesizing of colorimetric chemosensors to detect the cations in the aqueous medium and biological sample. To achieve this goal a new series of quinazolinone derivatives were synthesized via reaction of the novel 6-nitro-2-propyl-4H-benzo[d][1,3]oxazin-4-one (3) with selected nitrogen nucleophiles, namely, formamide, hydrazine hydrate, hydroxylamine hydrochloride, O-phenylendiamine, O-aminophenol and O-aminothiophenol, urea and/or thiourea. Structures of the new compounds have been investigated depending on their spectral data (IR, 1H NMR, 13C NMR and MS) and elemental analyses. Some of the newly synthesized products exhibited a significant response as chemosensors for some cations detection. The synthesized chemosensors 11a and 11b showed high-selectivity and specificity towards cooper (CuII) and mercury (HgII) cations detection through exhibiting colormetric responses. Chemosensors 7 and 10b showed high selectivity toward cadmium (CdII) cation, whilst other examined compounds (9b, c, 10a, 12, 13, and 14) did not exhibit colorimetric response in all cation's samples.   Resumen. En el presente proyecto se diseñan y sintetizan quimiosensores colorimétricos para detectar los cationes en el medio acuoso y en la muestra biológica. Para lograr este objetivo se sintetizó una nueva serie de derivados de quinazolinona mediante la reacción de la 6-nitro-2-propil-4H-benzo[d][1,3]oxazin-4-ona (3) con nucleófilos nitrogenados seleccionados, a saber, formamida, hidrato de hidracina, clorhidrato de hidroxilamina, O-fenilendiamina, O-aminofenol y O-aminotiofenol, urea y/o tiourea. Las estructuras de los nuevos compuestos se han comprobado en función de sus datos espectrales (IR, 1H NMR, 13C NMR y MS) y de los análisis elementales. Algunos de los nuevos productos sintetizados mostraron una respuesta significativa como quimiosensores para la detección de algunos cationes. Los quimiosensores sintetizados 11a y 11b mostraron una alta selectividad y especificidad hacia la detección de los cationes cobre (Cu II) y mercurio (Hg II) al mostrar respuestas colormétricas. Los quimiosensores 7 y 10b mostraron una alta selectividad hacia el catión cadmio (Cd II), mientras que otros compuestos examinados (9b, c, 10a, 12, 13 y 14) no mostraron respuesta colorimétrica con los cationes investigados.

Synthesis of New Tetra Triazole Functionalized Calix[4]resorcinarene and Chemosensing of Copper Ions in Aqueous Medium

2020 ◽  
Vol 24 (3) ◽  
pp. 332-337
Author(s):  
Tahir Qadri ◽  
Imdad Ali ◽  
Mumtaz Hussain ◽  
Farid Ahmed ◽  
Muhammad R. Shah ◽  
...  
Keyword(s):  
Aqueous Medium ◽  
High Selectivity ◽  
Copper Ions ◽  
Tap Water ◽  
Copper Ion ◽  
Absorption Intensity ◽  
Binding Ratio ◽  
Detectable Limit ◽  
Job's Plot ◽  
Job’S Plot

A new tetra triazole functionalized calix[4]resorcinarene macrocycle (5) is synthesized and utilized for the detection of copper ions in the aqueous medium. The photophysical potential of compound (5) is examined by a range of cations (Ba2+, Ca2+, Co2+, Hg2+, K+, Mg2+, Mn2+, Na+, NH4 + and Pd2+). The triazole based calix[4]resorcinarene macrocycle (5) has interacted with Cu2+ ion in preference of other cations. A significant quenching has been observed after the addition of 15 μM Cu2+ ion solution, which produced 4.2 folds drift in the absorption intensity of compound (5). Tetra triazole functionalized calix[4]resorcinarene macrocycle showed high selectivity towards copper ion chemosensing without any interference in competitive studies. The pH studies of compound (5) with Cu2+ indicated the maximum chelation between 7- 7.5 pH. The compound (5) is capable to recognize Cu2+ at 1 μM detectable limit. Copper ion was detected in tap water with 15 μM concentration. Job’s plot showed 1:2 binding ratio between macrocycle (5) and Cu2+.

Benzoindolium–triarylborane conjugates: a ratiometric fluorescent chemodosimeter for the detection of cyanide ions in aqueous medium

2016 ◽  
Vol 45 (12) ◽  
pp. 5014-5020 ◽  
Author(s):  
C. Arivazhagan ◽  
Rosmita Borthakur ◽  
R. Jagan ◽  
Sundargopal Ghosh
Keyword(s):  
Aqueous Medium ◽  
High Selectivity ◽  
Fluorescent Chemodosimeter

A new ratiometric fluorescent chemodosimeter has been synthesized and characterized that exhibits high selectivity and sensitivity toward CN− ions in aqueous medium.

A pyrene thiazole conjugate as a ratiometric chemosensor with high selectivity and sensitivity for tin (Sn4+) and its application in imaging live cells

RSC Advances ◽  
2014 ◽  
Vol 4 (100) ◽  
pp. 56605-56614 ◽  
Author(s):  
Ajit Kumar Mahapatra ◽  
Sanchita Mondal ◽  
Kalipada Maiti ◽  
Saikat Kumar Manna ◽  
Rajkishor Maji ◽  
...  
Keyword(s):  
Aqueous Medium ◽  
High Selectivity ◽  
Live Cells ◽  
Ratiometric Detection

A new pyrene thiazole-conjugate amine based fluoroionophore, PTC was developed for ratiometric detection of Sn4+ ion in organo-aqueous medium.

Understanding the electrokinetic behavior of the acrylic acid based Fe(II) ion-imprinted polymer for its application in Fe(II) ions removal from aqueous medium with high selectivity

2021 ◽  
Vol 232 ◽  
pp. 165-186
Author(s):  
Tanveer ul Haq Zia ◽  
Daud Khan Ghazali ◽  
Behisht Ara ◽  
Kashif Gul ◽  
Muhammad Hassaan Qureshi ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Aqueous Medium ◽  
High Selectivity ◽  
Ion Imprinted Polymer ◽  
Imprinted Polymer ◽  
Ion Imprinted
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