A highly selective thiosemicarbazone based Schiff base chemosensor for colorimetric detection of Cu2+ and Ag+ ions and turn-on fluorometric detection of Ag+ ions

Sahu, Meman; Manna, Amit Kumar; Rout, Kalyani; Mondal, Jahangir; Patra, Goutam Kumar

doi:10.1016/j.ica.2020.119633

Cited by 91 publications

(19 citation statements)

References 54 publications

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“…As seen from Figure 4a, the nearly 62 % increasing for the relative fluorescence signal of 2 +Ag + complex was obtained when pH was changed from 3.0 to 6.0 whereas after this pH relative fluorescence signal of 2 +Ag + complex decreased. The observed change for the relative fluorescent response of 2 +Ag + complex can be assigned to hydrolysis of C=N bond in acidic medium and affecting to form the metal ions in the basic pH values [19b,24c,26] . Because hydrolysis of C=N bond is more effective in acidic medium whereas it was relatively low at neutral pH [19b] .…”

Section: Resultsmentioning

confidence: 97%

A Novel Selective “Turn‐On” Fluorescent Chemosensor Based on Thiophene Appended Cyclotriphosphazene Schiff Base for Detection of Ag⁺ Ions

Tümay

2021

ChemistrySelect

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The salicylaldehyde-functionalized cyclotriphosphazene (1) and thiophene appended cyclotriphosphazene based Schiff base (2) were designed and synthesized. The characterizations were carried out via MALDI-TOF, FTIR, 13 C, 31 P and 1 H NMR. The photophysical behavior of compound 2 was evaluated by UV-Vis absorption, time-resolved fluorescence, excitation-emission matrix (EEM) analysis, steady-state fluorescence, and 3Dfluorescence spectroscopies. Compound 2 demonstrated selective fluorescence "turn-on" response at 427 nm towards to Ag + ion when the tested competitive species did not affect fluorescence signal. The binding and sensing mechanisms were evaluated by DFT calculations which approved that the PET process between C=N and fluorophore groups was inhibited, and the fluorescence "turn-on" response was obtained with the contribution of CHEF after 1 : 1 coordination of compound 2 with Ag + ion. The LOD and LOQ were calculated as 3.15 and 9.45 μmol L À 1 , respectively in the linear range of 9.35-210.00 μmol L À 1 Ag + ions. The practical application of compound 2 for Ag + determination was successfully performed in environmental waters after optimization of measurement conditions. The obtained results approved that compound 2 is a selective fluorescent sensor for Ag + ions and it can be used for spectrofluorimetric Ag + determination in real samples. Importantly, according to the literature, this report is the first example of cyclotriphosphazene based fluorescent sensor for Ag + ion.

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Section: Resultsmentioning

confidence: 97%

A Novel Selective “Turn‐On” Fluorescent Chemosensor Based on Thiophene Appended Cyclotriphosphazene Schiff Base for Detection of Ag⁺ Ions

Tümay

2021

ChemistrySelect

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“…Compounds which display reversible property changes upon some sort of stimulus are of interest due to potential applications, including optical switches (Sliwa et al, 2005), sensors (Sahu et al, 2020) or optical data storage (Wang et al, 2020). Within these are compounds displaying temperature-dependent thermochromic (Seeboth et al, 2014;Suzuki et al, 2019) or light-induced photochromic (Wu et al, 2020) colour changes.…”

Section: Introductionmentioning

confidence: 99%

Selected solid-state behaviour of three di-tert-butyl-substituted N-salicylideneaniline derivatives: temperature-induced phase transitions and chromic behaviour

2021

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The synthesis, single-crystal structures and chromic behaviour of three related Schiff bases, namely, (E)-2,4-di-tert-butyl-6-{[(4-fluorophenyl)imino]methyl}phenol, C21H26FNO, 1, (E)-2,4-di-tert-butyl-6-{[(4-chlorophenyl)imino]methyl}phenol, C21H26ClNO, 2, and (E)-6-{[(4-bromophenyl)imino]methyl}-2,4-di-tert-butylphenol, C21H26BrNO, 3, are reported. Two polymorphs of 1 were obtained, which were found to have different photochromic properties. Schiff bases 2 and 3 were found to be isostructural and underwent a phase transition upon cooling which was attributed to the dynamic disorder in one of the tert-butyl groups resolving at low temperature. All of the structures were found to exist in the enol rather than the keto form based on the C—O(H) and imine C=N bond lengths, and contained an intramolecular O—H...N hydrogen bond alongside weaker intermolecular C—H...O contacts.

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“…In this respect, Schiff base polymers (SBP) are attracting the attention of many scientists in recent years. [35][36][37] It is a kind of covalent polymer containing imine or methylamine characteristic group (À RC=NÀ ), which is formed by condensation of amine and active carbonyl group. [38,39] Since its conjugated chain does not contain bonding electrons on the N atom, it is necessary to change the polymer's charge distribution and band structure to produce a strong fluorescence.…”

Section: Introductionmentioning

confidence: 99%

“…In this respect, Schiff base polymers (SBP) are attracting the attention of many scientists in recent years [35–37] . It is a kind of covalent polymer containing imine or methylamine characteristic group (−RC=N−), which is formed by condensation of amine and active carbonyl group [38,39] .…”

Section: Introductionmentioning

confidence: 99%

A Novel Fluorescent 1,10‐Phenanthroline‐2,9‐dicarboxaldehyde‐ 2,5‐diaminoterephthalicacid‐Schiff Base Polymer for Cu²⁺ Detection

et al. 2021

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A novel fluorescent Schiff base polymer (PTDA-DATA-SBP) is synthesized by amine aldehyde condensation reaction between 1,10-phenanthroline-2,9-dicarboxaldehyde (PTDA) and 2,5-diaminoterephthalicacid (DATA) as a selective fluorescent probe for Cu 2 + detection. The as-prepared PTDA-DATA-SBP displayed irregular nanospheres with a diameter of about 5 μm. Under the excitation of 338 nm, the PTDA-DATA-SBP had a characteristic emission peak at 565 nm. The PTDA groups in PTDA-DATA-SBP could coordinate with Cu 2 + under help of carboxyl groups of DATA. Owing to the photoinduced electron transfer mechanism, the fluorescence of PTDA-DATA-SBP was weak-ened after the addition of Cu 2 + in the presence of common ions. Hence, the PTDA-DATA-SBP was exploited as a fluorescent nanosensor for sensing Cu 2 + . The PTDA-DATA-SBP showed high selectivity and fast response towards Cu 2 + even in presence of other relevant metal ions. The PTDA-DATA-SBP fluorescent sensor has a good linear range of 3.45 nM-8.00 μM, and the limit of detection was as low as 1.15 nM. The proposed PTDA-DATA-SBP sensor could also detect Cu 2 + in actual samples. The work not only provided a good fluorescent probe for Cu 2 + detection but also provided a feasible strategy to construct highly selective fluorescent probes.

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A highly selective thiosemicarbazone based Schiff base chemosensor for colorimetric detection of Cu2+ and Ag+ ions and turn-on fluorometric detection of Ag+ ions

Cited by 91 publications

References 54 publications

A Novel Selective “Turn‐On” Fluorescent Chemosensor Based on Thiophene Appended Cyclotriphosphazene Schiff Base for Detection of Ag⁺ Ions

A Novel Selective “Turn‐On” Fluorescent Chemosensor Based on Thiophene Appended Cyclotriphosphazene Schiff Base for Detection of Ag⁺ Ions

Selected solid-state behaviour of three di-tert-butyl-substituted N-salicylideneaniline derivatives: temperature-induced phase transitions and chromic behaviour

A Novel Fluorescent 1,10‐Phenanthroline‐2,9‐dicarboxaldehyde‐ 2,5‐diaminoterephthalicacid‐Schiff Base Polymer for Cu²⁺ Detection

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A highly selective thiosemicarbazone based Schiff base chemosensor for colorimetric detection of Cu2+ and Ag+ ions and turn-on fluorometric detection of Ag+ ions

Cited by 91 publications

References 54 publications

A Novel Selective “Turn‐On” Fluorescent Chemosensor Based on Thiophene Appended Cyclotriphosphazene Schiff Base for Detection of Ag+ Ions

A Novel Selective “Turn‐On” Fluorescent Chemosensor Based on Thiophene Appended Cyclotriphosphazene Schiff Base for Detection of Ag+ Ions

Selected solid-state behaviour of three di-tert-butyl-substituted N-salicylideneaniline derivatives: temperature-induced phase transitions and chromic behaviour

A Novel Fluorescent 1,10‐Phenanthroline‐2,9‐dicarboxaldehyde‐ 2,5‐diaminoterephthalicacid‐Schiff Base Polymer for Cu2+ Detection

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A Novel Selective “Turn‐On” Fluorescent Chemosensor Based on Thiophene Appended Cyclotriphosphazene Schiff Base for Detection of Ag⁺ Ions

A Novel Selective “Turn‐On” Fluorescent Chemosensor Based on Thiophene Appended Cyclotriphosphazene Schiff Base for Detection of Ag⁺ Ions

A Novel Fluorescent 1,10‐Phenanthroline‐2,9‐dicarboxaldehyde‐ 2,5‐diaminoterephthalicacid‐Schiff Base Polymer for Cu²⁺ Detection