Ag(I) and Hg(II) Coordination Polymers Decorated from Fully Benzimidazole Substituted Cyclotriphosphazene Ligand and Adsorption Behaviour Against Methylene Blue

Herein, we reported new two coordination polymers, {[Ag(L)](CH₃PhSO₃)](CH₃CN)₄}_n (cp-1) and {[Hg(L)](Cl₂)](CH₃CN)₂}_n (cp-2), were synthesized from hexapodal benzimidazole substituted cyclotriphosphazene, (L). L was characterised by ¹H NMR, ³¹P NMR and mass analysis. Structure of each isolated compounds were determined by single crystal X-ray crystallography. In cp-1, L has a κ³N coordination mode by connecting three Ag(I) ions to constitute a 2D coordination polymer whereas the ligand in cp-2 displays κ²N coordination mode via linking two Hg(II) ions together to create a 1D coordination polymer. Topologically, cp-1 has a 3-connected uninodal net having the point symbol {4.8²}. Dye adsorption studies of coordination polymers was performed out using UV–Vis. absorption spectroscopy. Adsorption experiments show that cp-1 and cp-2 removes the cationic methylene blue (MB) from water but shows no adsorption behaviour toward the anionic methyl orange (MO) and tartrazine (E102).