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1.
Dalton Trans ; 44(26): 11805-10, 2015 Jul 14.
Article in English | MEDLINE | ID: mdl-26051708

ABSTRACT

A chemosensor was developed which could selectively detect and differentiate trivalent metal ions (Al(3+), Cr(3+) and Fe(3+)) upon single excitation at two different wavelengths in aqueous medium. This probe selectively detects trivalent ions in the presence of different metal ions in aqueous medium. It shows an excellent performance in the "dipstick" method.


Subject(s)
Aluminum/analysis , Chromium/analysis , Fluorescent Dyes/chemistry , Iron/analysis , Rhodamines/chemistry , Water/analysis , Cations/analysis , Naphthalenes/chemistry , Spectrometry, Fluorescence/methods , Spectrophotometry, Ultraviolet/methods
2.
Anal Chem ; 86(13): 6315-22, 2014 Jul 01.
Article in English | MEDLINE | ID: mdl-24806145

ABSTRACT

By employing the oxidation property of hypochlorite (OCl(-)), a novel rhodamine-based hydrazide of the chiral acid ((S)-(-)-2-pyrrolidone-5-carboxylic acid) (RHHP) was designed and synthesized for detection of OCl(-) absolutely in aqueous medium at nanomolar level. The structure of the chiral sensor was also proved by the X-ray crystallography. The bioactivity and the application of the probe for detection of OCl(-) in natural water system have been demonstrated. A plausible mechanism for oxidation of the sensor followed by hydrolysis is also proposed. The sensibility of the receptor toward OCl(-) was studied in absolute aqueous media, and the detection limit of hypochlorite-mediated oxidation to the receptor in nanomolar level makes this platform (RHHP) an ultrasensitive and unique system for OCl(-) oxidation.


Subject(s)
Cytoplasm/chemistry , Drinking Water/analysis , Fluorescent Dyes/chemistry , Hydrazines/chemistry , Hypochlorous Acid/analysis , Optical Imaging , Rhodamines/chemistry , Crystallography, X-Ray , Cytoplasm/ultrastructure , HeLa Cells , Humans , Hydrolysis , Limit of Detection , Microscopy, Fluorescence , Models, Molecular , Oxidation-Reduction , Pyrrolidinones/chemistry
3.
Dalton Trans ; 43(1): 231-9, 2014 Jan 07.
Article in English | MEDLINE | ID: mdl-24096339

ABSTRACT

A new spirobenzopyran derivative (SPNH) was designed and synthesized which was applied in simultaneous colorimetric and NIR fluorescence detections for Cr(3+). This spirobenzopyran receptor is normally colorless in aqueous organic media but the formation of merocyanine occurs by Cr(3+) showing a yellow color. Here the formation of yellow color in UV-vis spectra and strong NIR fluorescence emission at 675 nm makes SPNH a good sensor for Cr(3+) ion. It is also found to be useful in cell imaging and in construction of logic gate. It shows INHIBIT gate in fluorescence and OR gate in absorption. To the best of our knowledge, this is the first report of NIR fluorescence emission of a spirobenzopyran derivative by Cr(3+) and its application to cell-biology and also in the logic gate.


Subject(s)
Benzopyrans/analysis , Chromium/analysis , Fluorescent Dyes/analysis , Cations/analysis , Colorimetry/methods , HeLa Cells , Humans , Models, Molecular , Optical Imaging , Spectrometry, Fluorescence/methods
4.
Chem Commun (Camb) ; 49(99): 11656-8, 2013 Dec 25.
Article in English | MEDLINE | ID: mdl-24185489

ABSTRACT

We have designed a chemodosimeter DPNO (weak fluorescence) which can be oxidized to HPNO (strong blue fluorescence) by OCl(-) with high selectivity and sensitivity in a ratiometric approach with a noticeably lower detection limit. The sensor could be useful for the detection of hypochlorites in tap water.


Subject(s)
Drinking Water/analysis , Fluorescent Dyes/chemistry , Hypochlorous Acid/analysis , Naphthalenes/chemistry , Limit of Detection , Models, Molecular , Spectrometry, Fluorescence/economics , Spectrometry, Fluorescence/methods
5.
Dalton Trans ; 42(36): 12844-8, 2013 Sep 28.
Article in English | MEDLINE | ID: mdl-23900587

ABSTRACT

A new rhodamine based chemosensor, cyano-rhodamine, has been designed and synthesized with a green approach which shows a specific 'C-CN' bond breaking with the action of the Pd(2+) ion to produce the specific color and fluorescence of rhodamine 6G itself in solution and in HeLa cells.


Subject(s)
Cyanides/chemistry , Palladium/analysis , Rhodamines/chemistry , Cyanides/chemical synthesis , HeLa Cells , Humans , Models, Molecular , Rhodamines/chemical synthesis , Spectrometry, Fluorescence
6.
Dalton Trans ; 42(30): 10682-6, 2013 Aug 14.
Article in English | MEDLINE | ID: mdl-23788230

ABSTRACT

A hybrid carbazole hemicyanine dye (receptor CHD) was developed as a new visible and near infrared chemodosimeter type sensor with high ratiometric selectivity towards cyanide in the presence of other anions in aqueous solution. The chemosensor also showed excellent performance when used in the "dip stick" method, i.e. in solid phase (TLC plates).

7.
Dalton Trans ; 42(28): 10097-101, 2013 Jul 28.
Article in English | MEDLINE | ID: mdl-23732748

ABSTRACT

The de-diaminomaleonitrile reaction in a simple carbazole diaminomaleonitrile hybrid (CDH) was promoted by OCl(-) which disrupted the ICT mechanism by breaking the donor and acceptor linkage. This system utilized an irreversible OCl(-) promoted oxidation reaction and it responded instantaneously at room temperature. The chemosensor also showed excellent performance in tap water and the "dip-stick" method.


Subject(s)
Carbazoles/chemistry , Fluorescent Dyes/chemistry , Hypochlorous Acid/analysis , Nitriles/chemistry , Water/analysis , Hypochlorous Acid/chemistry , Oxidation-Reduction
8.
Analyst ; 138(16): 4593-8, 2013 Aug 21.
Article in English | MEDLINE | ID: mdl-23752275

ABSTRACT

A new "naked-eye" and ratiometric fluorescent zinc sensor (TAQ) of carboxamidoquinoline with 2-chloro-N-(quinol-8-yl)-acetamide as a receptor was designed and synthesized. The sensor shows good water solubility and high selectivity for sensing; about a 15-fold increase in fluorescence quantum yield and a 100 nm red-shift of fluorescence emission upon binding Zn²âº in aqueous HEPES buffer solution are observed. The human lung cancer cell line (A549) activity is also demonstrated.


Subject(s)
Biosensing Techniques/methods , Cell Death/physiology , Lung Neoplasms/metabolism , Water/metabolism , Zinc/metabolism , Cell Line, Tumor , Fluorescent Dyes/chemistry , Fluorescent Dyes/metabolism , Humans , Solubility , Spectrometry, Fluorescence/methods , Water/chemistry , Zinc/chemistry
9.
Dalton Trans ; 42(22): 8078-85, 2013 Jun 14.
Article in English | MEDLINE | ID: mdl-23575906

ABSTRACT

In this study, we have synthesized a simple Schiff base type isophthaloyl salicylaldehyde hydrazone (ISH) moiety which selectively detects Al(III) and PPi with a fluorescence enhancement at two different wavelengths in aqueous solution. The sensing phenomenon is also reversible and thus the sensor beautifully mimics logic gates (INHIBIT and EXOR gates).


Subject(s)
Aldehydes/chemistry , Aluminum/chemistry , Diphosphates/analysis , Fluorescent Dyes/chemistry , Hydrazones/chemistry , Schiff Bases/chemistry , Spectrometry, Fluorescence/instrumentation , Equipment Design , Sensitivity and Specificity
10.
Chem Commun (Camb) ; 49(28): 2912-4, 2013 Apr 11.
Article in English | MEDLINE | ID: mdl-23450121

ABSTRACT

For ratiometric "naked eye" detection of CN(-), an ESIPT exhibiting benzothiazole receptor (BHI) is designed having one aldehyde group ortho and the other aldehyde para to the OH group respectively. Due to RAHBs, the ortho aldehyde group is highly reactive undergoing nucleophilic cyanide addition selectively, which hampered ESIPT. This is also supported by DFT and TD-DFT calculations.

11.
Analyst ; 138(6): 1903-7, 2013 Mar 21.
Article in English | MEDLINE | ID: mdl-23392200

ABSTRACT

A new rhodamine-quinoline based dyad has been synthesized. It shows a highly selective response to Cd(2+) in the presence of other competing metal ions in aqueous media (pH = 7.1). The detection limit of the sensor is in the 10(-7) M level.


Subject(s)
Cadmium/analysis , Fluorescent Dyes/chemistry , Quinolines/chemistry , Rhodamines/chemistry , Spectrometry, Fluorescence/methods , Water Pollutants, Chemical/analysis , Cations, Divalent/analysis , Colorimetry , Limit of Detection , Water/analysis
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