Abstract
• A secondary building unit of a copper(II) 2,3-pyridinedicarboxylate stabilized by with amino-methylthiazolium cation was structurally characterized. • The interactions of the SBU and the corresponding coordination polymer with cationic and anionic dyes were investigated. • The in-situ change in pH by cation exchange during dye interaction caused oscillation in the concentration of a dye with time. A secondary building unit (SBU) and the corresponding copper 2,3-pyridinedicarboxylate coordination polymer of it were investigated to unfold the comparative ability on the interactions with ionic dyes. Complementary hydrogen bonds of the 2-amino-4-methylthiazolium cation enabled us to stabilise the SBU by organo-cations. The SBU was characterised by IR, UV–visible, thermogravimetry, ESR, PXRD and finally by determining the crystal structure. The interactions of the SBU and the coordination polymer with organic ionic dyes, namely, methyl-violet 2B, methyl-orange and rhodamine B had shown oscillation concentration of the adsorbed dye. The comparative study revealed that irrespective of the ionic nature of the dye, similar interactions by the coordination polymer with the SBU were observed where the pH change caused by ion exchange guided the adsorption at a particular time.
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