Visual & reversible sensing of cyanide in real samples by an effective ratiometric colorimetric probe & logic gate application

Crystal structure of (E)-2,6-di-tert-butyl-4-{[2-(2,4-dinitrophenyl)hydrazinylidene]methyl}phenol

“…There are very few examples of similar compounds in the literature. To the best of our knowledge, the recent report (Bhardwaj & Singh, 2015) of a similar compound with an hydroxy group in the ortho position, capable of visual and reversible sensing of cyanide in DMSO solution, has not been characterized crystallographically. A search of the Cambridge Structural Database (CSD, Version 5.37, update May 2016; Groom et al, 2016) revealed the structure of one very similar compound, viz.…”

Naked Eye Detection of Carbonate, Hydroxide, and Cyanide Ions with 1,4′‐Diazaflavonium Bromides: A Simple Spectrophotometric Method for Cyanide Determination

“…Some fluorescent chemosensors were reported to determine cyanide ion in the literature . However, there are a few colorimetric chemosensors to sense cyanide ion with naked eye in the literature . The detection limits based on visual color changes were about 5 × 10 −4 and 5 × 10 −5 M for the proposed sensors .…”

“…However, there are a few colorimetric chemosensors to sense cyanide ion with naked eye in the literature . The detection limits based on visual color changes were about 5 × 10 −4 and 5 × 10 −5 M for the proposed sensors . In the presented study, the corresponding detection limit is 2.4 × 10 −4 M for cyanide ion with C7 .…”

Fluorescent imidazole-based chemosensors for the reversible detection of cyanide and mercury ions

“…The monopotassium salt was acidified with concentrated HCl, followed by a thorough wash with hot water and a yellow powder of the imidazole carboxylic acid 1 was obtained in 92% yield (436 mg, 0.839 mmol). Mp: 308 °C; R f = 0.48 (CH 2 Cl 2 /CH 4 O, 1/1, v/v); 1 H NMR (400 MHz, dmso-d 6 ): δ = 13.45 (s, 1H, -OH), 10.41 (s, 1H, -CHO), 8.92 (dd, J = 8.9, 2.4 Hz, 2H, Ar), 8.61 (dd, J = 7.9, 1.1 Hz, 1H, Ar), 8.27 (dd, J = 8.2, 2.3 Hz, 2H, Ar), 7.95 (t, J = 10.6 Hz, 2H, Ar), 7.80 (dd, J = 11.1, 3.9 Hz, 1H, Ar), 7.76 -7.65 (m, 2H, Ar), 7.59 (dd, J = 11.4, 4.2 Hz, 1H, Ar), 7.38 (t, J = 7.6 Hz, 1H, Ar), 7.30 (d, J = 7.2 Hz, 1H, Ar), 7.05 (d,J = 7.7 Hz,1H,Ar), 0.98 ppm (s, 9H, -CH 3 ); 13 C NMR (101 MHz, dmso-d 6 ): 191.31, 166.80, 159.27, 147.63, 142.23, 140.96, 134.77, 133.41, 132.14, 129.84, 129.29, 128.37, 127.56, 127.29, 126.83, 126.58, 126.34, 125.77, 125.15, 124.30, 123.22, 122.36, 120.81, 115.81, 34.08, 30.94 ppm; IR (ATR): ν max (cm -1 ) = 3223, 1682, 1596, 1474, 1445, 1377, 1263, 1220HRMS (ESI): m/z calcd. for [C 33 H 27 N 2 O 4 ] (M+H) + 515.1965; found 515.1976.…”

“…Finally, a yellow powder of the imidazole carboxylic acid 2 was obtained in 90% yield (426 mg, 0.825 mmol). Mp: 265 °C; R f = 0.48 (CH 2 Cl 2 /CH 4 O, 1/1, v/v); 1 H NMR (400 MHz, dmso-d 6 ): δ = 13.36 (m, 1H, -OH), 10.45 (s, 1H, -CHO), 7.95 (t,J = 8.8 Hz,2H,Ar),3H,Ar),7.45 (dd,J = 11.7,4.5 Hz,3H,Ar),7H,Ar), 6.97 (d,J = 2.5 Hz,1H,Ar), 0.88 ppm (s, 9H, -CH 3 ); 13 C NMR (101 MHz, dmso-d 6 ): 190.33,167.27,159.25,143.80,131.72,131.33,130.91,130.31,129.43,129.09,129.02,128.77,128.63,126.91,126.67,126.55,124.89,123.42,115.97,31.63,30.93,30.87 ppm;IR (ATR): 1682, 1657, 1599, 1477, 1381, 1263, 1216, 1169, 1008, 768, 697, 4-(2-(5-(tert-butyl)-3-formyl-2-hydroxyphenyl)-1Hphenanthro[9,10-d]imidazol-1-yl)benzoate (3). A solution of phenanthrene-9,10-dione (0.500 g, 2.4 mmol) and 5-tert-butyl-2hydroxyisophthalaldehyde (0.495 g, 2.4 mmol) was added to acetic acid (30 mL).…”