One cadmium (II)-based metal−organic framework as high-efficiency multi-functional fluorescence chemosensor targeting for the determination of Fe3+, Cr2O72– and CrO42– in aqueous phase

•Four MOFs were prepared and characterized.•Cd-MOF behaves a multi-functional chemosensor toward Fe3+, Cr2O72− and CrO42–.•Sensing mechanisms of Cd-MOF are supported by PXRD, ICP-AES, FT-IR spectra, UV−vis or XPS and SEM mapping.•Magnetic and cyclic voltammetry properties of Ι−Ⅲ have been investigated.