Subtle structure and fluorescence signal changes of four Hg-containing complexes: Influence of the solvents and the halide ions

► Four Hg(II)-containing complexes have been synthesized and characterized. ► Complex 4 is isomeric with 3 and they are obtained from different solvent. ► Calculated results prove that solvent effects have influence on their structures. ► Halide anions of complexes have different impacts on their fluorescence properties.