Functionalization of Keggin type manganese substituted phosphotungstate by R-(−)-1-cyclohexylethylamine: Synthesis and characterization

A new chiral polyoxometalates based functionalized material comprising Keggin type mono manganese substituted phosphotungstate and enantiopure R-(−)-1-cyclohexylethylamine was synthesized in an aqueous media by simple ligand substitution method. The POM-based synthesized material was systematically characterized in solid as well as solution by various physicochemical techniques such as elemental analysis, TGA, UV–Vis, FT-IR, ESR and multinuclear solution NMR (31P, 1H, 13C). The presence of chirality in the synthesized material was confirmed by CD spectroscopy and polarimeter. The above study reveals the attachment of R-(−)-1-cyclohexylethylamine to Keggin type mono manganese substituted phosphotungstate through N → Mn dative bond. It also indicates the retainment of Keggin unit and chirality in the synthesized material.