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Thursday 4 June 2015

Quinoline based receptor in fluorometric discrimination of carboxylic acids


[1860-5397-4-52-14]
1H NMR (in CDCl3) spectra of receptor 1 (c = 3.57 × 10−3 M; bottom) and the 1:1 complex with citric acid (top); *indicates signals of quinoline rings.

Melting point = 60 °C.  

1H NMR (400 MHz, CDCl3, δ in ppm) 9.45 (2H, -CONH-), 8.87 (2H, d, J = 4.00 Hz), 8.70 (1H, s), 8.30 (2H, d, J = 8.24 Hz), 8.25 (2H, d, J = 7.64 Hz), 8.08 (2H, d, J = 8.28 Hz), 7.73 (2H, t, J = 8.00 Hz), 7.65 (1H, t, J = 7.76 Hz), 7.44–7.33 (6H, m), 7.18 (2H, d, J = 7.40 Hz), 7.07 (2H, d, J = 7.36 Hz), 4.64 (4H, s), 4.43 (4H, t, J = 4.00 Hz), 4.08 (4H, t, J = 4.00 Hz). 

 13C (100 MHz, CDCl3) 164.8, 155.9, 154.4, 151.4, 148.9, 139.8, 139.1, 136.1, 134.5, 131.5, 129.4, 129.3, 126.6, 125.8, 121.6, 119.8, 117.6, 113.2, 108.7, 73.3, 69.1, 67.8.

 ESI (positive ionisation): 743.3 (M + Na)+, 721.4 (M + H)+, 361.3, 296.2. 

FTIR (ν cm−1, KBr) 3385, 1677, 1455, 1318, 1105.

Quinoline based receptor in fluorometric discrimination of carboxylic acids

Kumaresh Ghosh1Email of corresponding author, Suman Adhikari1, Asoke P. Chattopadhyay1 and Purnendu Roy Chowdhury2
1Department of Chemistry, University of Kalyani, Kalyani, Nadia-741235, India
2Chembiotek Research International Pvt. Ltd., Salt Lake City, Kolkata-700 091, India
Beilstein J. Org. Chem. 2008, 4, No. 52.
 doi:10.3762/bjoc.4.52
[1860-5397-4-52-i1]
Scheme 1: Syntheses of receptors 1 and 2

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