A Naked-Eye Colorimetric Receptor for Anions Based on Nitro Group Featuring with Benzimidazole Unit

R. Rahmawati1,2,*, B. Purwono2,* and S. Matsjeh2

1Study Program of Chemistry, Department of Education of Mathematics and Natural Sciences, University of Mataram, Jalan Majapahit 62, Mataram, Indonesia

2Department of Chemistry, University of Gadjah Mada, Jalan Kaliurang Sekip Utara Bulaksumur 21, Yogyakarta, Indonesia

*Corresponding authors: E-mail: purwono.bambang@ugm.ac.id; tqomari31@gmail.com


A novel receptor based on nitro group featuring with benzimidazole unit (S2) was successfully synthesized and applied to the anion (CN, F and H2PO4) recognition. The S2 changed its colour for light yellow to dark yellow on addition of the anions in DMSO solvent. The LOD and Kass values determined by UV-visible titration was 2.8 × 10–6 M and 1.2 (± 0.25) × 106 M–1 for CN ion; 1.14 × 10–6 M and 2.5 (± 0.25) × 106 M–1 for F ion; and 1.23 × 10–5 M and 6.25 (± 0.177) × 106 M–1 for H2PO4 ion, respectively.


Colorimetric, Nitro group, Benzimidazole.

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