Figure 3.

(a) The solid photoluminescence spectrum for complex 1 and ligand; (b) the efficiency of luminescence quenching after introducing diverse anions to complex 1’s dispersion in the water. (c) The luminescence strengths of complex 1 soaked into the mixed anions with Cr₂O₇^{2 –} ions (1 mM) and 1 mM pure separate anions. (d) The MOF photoluminescence spectra in this blank water solution, in the existence of the water solution of some other anions (1 mM) (I⁻, Cl⁻, F⁻, HPO₄^2-, BrO₃⁻, IO₃⁻, NO₃⁻, SCN⁻ and CO₃^2-) and after adding 1 mM of the Cr₂O₇^2- ions