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 Ghosh¹

, 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

Scheme 1: Syntheses of receptors 1 and 2

http://www.beilstein-journals.org/bjoc/single/articleFullText.htm?publicId=1860-5397-4-52

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