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Single-crystal X-ray structures of dimeric quinoxaline aldehyde (QA), quinoxaline dihydrazone (DHQ) and HQNM (Goswami S  et al.  2013  Tetrahedron Lett.   54 , 5075–5077. ( doi:10.1016/j.tetlet.2013.07.051 ); Goswami S  et al.  2014  RSC Adv.   4 , 20 922–20 926. ( doi:10.1039/C4RA00594E ); Goswami S  et al.  2014  New J. Chem.   38 , 6230–6235. ( doi:10.1039/C4NJ01498G )) are reported along with the theoretical study. Among them, QA is not acting as an active probe, but DHQ and HQNM are serving as selective and sensitive probe for the Fe 3+  cation and the Ni 2+  cation, respectively. DHQ can also detect the Fe 3+  in commercial fruit juices (grape and pomegranate).

Sensing study of quinoxaline analogues with theoretical calculation, single-crystal X-ray structure and real application in commercial fruit juices