Facile green synthesized C-4-Hydroxy-3-methoxyphenylcalix[4]Resorcinarene (CHMPCR) for photometric sensing of Fe3+ and Cu2+ ions

•A resorcinarene-based CHMPCR sensor was synthesised by green method.•The sensor was selectively sense Fe(III) and Cu(II) ions by UV absorption and fluorescence method.•Binding mechanism was verified by 1H NMR, HRMS and FESEM.•CHMPCR is suitable for real water analysis. Adverse effect of iron and copper on aquatic life, motivates us to developed an easy, cost-effective and simple method for sensing Fe3+ and Cu2+ ions. Herein, we represent green, simple and one step method to synthesis C-4-Hydroxy-3-methoxyphenylcalix[4]Resorcinarene (CHMPCR) probe. The CHMPCR owns large number of coordinating groups (-OH and –OCH3), makes it as good candidate for metal ion sensing. The probe exhibited selective and sensitive ratiometric UV absorption/ fluorescence sensor for Fe3+ and Cu2+ ions, over the wide range of other metal ions in DMSO: water (7: 3 v/v) solution. The CHMPCR displays LOD of Fe3+ (1.47 µM) and Cu2+ (1.99 µM) by UV-absorption, however Fe3+ (12.14 µM) and Cu2+ (16.98 µM) through fluorescence approach. CHMPCR possessed 1:1 stoichiometry with Fe3+ and Cu2+ ions proved from Benesi-Hildebrand plot, 1H NMR and HRMS. The developed probe was well employed for ratiometric detection of Fe3+ and Cu2+ ions. [Display omitted]