A thiophene-linked terpyridine based phenanthridine chemoreceptor for Cd and Cr selective ratiometric fluorescence detection in environmental water and rice samples.

Background: The studied materials, Cadmium (Cd) and Chromium (Cr) are highly toxic, and it focuses on investigating various environmental sources, such as industrial processes and waste water. When quantities of Cr and Cd exceed the allowable limit, biological toxicity and hazardous environmental pollution are unavoidable. In order to address this problem, we introduce 5-(5-(4-([2,2':6',2″-terpyridin]-4'-yl) phenyl) thiophen-2-yl)-7,8,13,14-tetrahydrodibenzo [a,i] phenanthridine (TPTP), a dual-emission response chemosensor that employs a colorimetric and fluorescence turn-on approach for the rapid, sensitive, and discriminate detection of Cr and Cd ions.

AIE active luminous dye with a triphenylamine attached benzothiazole core as a portable polymer film for sensitively detecting CN- ions in food samples.

Aggregation-induced emission (AIE) active 3-(3-(benzo[d]thiazol-2-yl)-2-hydroxyphenyl)-2-(4'-(diphenylamino)-[1,1'-biphenyl]-4-yl)acrylonitrile (BTPA) has been designed and synthesized herein, with the goal of detecting CN ions at a low-level in semi-aqueous medium. The deliberate addition of the electron-deficient alkene BTPA increased its sensitivity and selectivity to CN ions, with a better detection limit of 6.4 nM, unveiling the next-generation approach to creating sophisticated CN ions selective chemosensors.

Benzothiazole appended 2,2'-(1,4-phenylene)diacetonitrile for the colorimetric and fluorescence detection of cyanide ions.

A benzothiazole appended 2,2'-(1,4-phenylene)diacetonitrile derivative (2,2')-2,2'-(1,4-phenylene)bis(3-(3-(benzo[]thiazol-2-yl)-4-hydroxyphenyl)acrylonitrile) (PDBT) has been synthesized and investigated as a novel sensor, capable of showing high selectivity and sensitivity towards CN over a wide range of other interfering anions. After reaction with CN, PDBT shows a new absorption peak at 451 nm with a color transformation from colorless to reddish-brown. When yellow fluorescent PDBT is exposed to CN, it displays a significant increase in fluorescence at 445 nm, resulting in strong sky-blue fluorescence emission.

Zinc ion detection using a benzothiazole-based highly selective fluorescence "turn-on" chemosensor and its real-time application.

A new photochromic fluorescence chemosensor was devised and effectively synthesized using benzothiazole and imidazopyridine derivatives. A "turn-on" fluorescence sensor BIPP for Zn detection was developed and has a quick response, excellent sensitivity, and remarkable selectivity over other metal ions. When Zn was added to the BIPP solution, a new strong fluorescence emission peak at 542 nm formed with a considerable increase in intensity.

A sensitive and selective BINOL based ratiometric fluorescence sensor for the detection of cyanide ions.

A highly selective, novel BINOL based sensor BBCN has been developed for the fluorescent ratiometric detection of cyanide ions (CN). The optical study revealed that BBCN exhibited unique spectral changes only with cyanide ions in the presence of other competing ions. Besides, an apparent fluorescent colour change from green to blue was observed.

A benzothiazole-based new fluorogenic chemosensor for the detection of CN and its real-time application in environmental water samples and living cells.

Since the cyanide ion is used in a wide range of industries and is harmful to both human health and the environment, a number of research efforts are dedicated to creating fluorescence sensors for the detection of cyanide (CN). Herein, for the fluorescence detection of CN, a new highly selective and sensitive sensor 2-(3-(benzo[]thiazol-2-yl)-4-hydroxybenzylidene)-1-indene-1,3(2)-dione (BID) was created by conjugating a benzothiazole moiety with 1-indene-1,3(2)-dione. The donor and acceptor components of this hybrid receptor were covalently connected through a double bond.

Highly sensitive naphthalimide based Schiff base for the fluorimetric detection of Fe.

A simple 1,8-naphthalimide based Schiff base probe ()-6-((4-(diethylamino)-2-hydroxybenzylidene)amino)-2-(2-morpholinoethyl)-1-benzo[de]isoquinoline-1,3(2)-dione (NDSM) has been designed and synthesized for the specific detection of Fe based on a fluorimetric mode. The absorbance of NDSM at 360 nm increased significantly in acetonitrile : water (7 : 3, v/v) medium only in the presence of Fe ions with a visible colour change from yellow to golden yellow. Likewise, fluorescence emission intensity at 531 nm was almost wholly quenched in the presence of Fe.

A Highly Selective and Sensitive Colorimetric Chemosensor for the Detection of Hydrogen Sulfide: A Real-time Application in Multiple platforms.

Calorimetric chemosensors are found to be advantageous sensing systems due to their simplicity and favorable responsive properties. Although some colorimetric probes have been reported to detect hydrogen sulfide (H S), the creation of rapid, highly selective and sensitive probes for the detection of H S remains a challenging target. In this work, we established dinitrosulphonamide decorated phenanthridine and 2,4-dinitro-N-(4-(7,8,13,14-tetrahydrodibenzo[a, i]phenanthridin-5-yl)phenyl)benzenesulfonamide (PHSH), for the calorimetric detection of H S.