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Absorbance intensity showed a good linear fit between probe <jats:bold>R1<\/jats:bold> and Cu<jats:sup>2+<\/jats:sup> over the concentration range 1\u20138 \u03bcM and the association constant was also calculated to be 1.145 \u00d7 10<jats:sup>5<\/jats:sup> M<jats:sup>\u22121<\/jats:sup>. The sensing mechanism was deduced using Job's plot, Fourier transform infrared spectroscopy, and density functional theory studies. In addition, the colorimetric experiment indicated that probe <jats:bold>RP1<\/jats:bold> could be made into test paper to detect Cu<jats:sup>2+<\/jats:sup> with a colour change from colourless to pink.<\/jats:p>","DOI":"10.1002\/bio.3769","type":"journal-article","created":{"date-parts":[[2020,1,16]],"date-time":"2020-01-16T00:16:13Z","timestamp":1579133773000},"page":"651-658","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["A colorimetric probe for detection of Cu<sup>2+<\/sup> by the naked eye and application in test paper"],"prefix":"10.1002","volume":"35","author":[{"given":"Xiaorui","family":"Cao","sequence":"first","affiliation":[{"name":"Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science Northwest University  Xi'an Shaanxi 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