Selective Adsorption of Anionic Dyes Using New Three-Dimension Ag(I) Coordination Polymer

Abstract We are reporting herein a new ligand 2,2,4,4,6,6-hexakis(2-ethyl-1H-imidazol-1-yl)-cyclotriphosphazene ( EtIm-Cp ) and its Ag(I) coordination polymer ( 1 ). EtIm-Cp was characterised by standard spectroscopic techniques, 1 H NMR, 31 P NMR, and mass spectrometric analysis. The compounds were characterized using single crystal X-ray diffraction. Ligand, EtIm-Cp , in complex 1 form a 3D coordination polymer by joining three Ag(I) ions, resulting in a κ 3 N coordination mode. Topological analysis confirms that complex 1 shows a three-connected unimodal net with the point symbol of {10 3 }. In order to adsorb three cationic and three anionic organic dyes in aqueous environments, coordination polymers were used. Experiments demonstrate that 1 shows no adsorption behavior towards cationic dyes methylene blue (MB) Rhodamine B (RhB), and Astrazon blue (AB) but it does remove the anionic methyl orange (MO), tartrazine (E102), and sunset yellow (SY) from water. Furthermore, complex 1 completely removed selectively anionic dyes from the anionic/cationic dye mixture. Surface charge values ​​obtained from zeta potential measurements confirm that anionic dyes are adsorbed onto the surface of the complex 1 . According to PXRD analysis, there was no deterioration in the chemical structure of the compound after adsorption. Graphical abstract